Faculty Profiles - NAKATSUKA, Takeshi

Papers - NAKATSUKA, Takeshi

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A 2600-year summer climate reconstruction in central Japan by integrating tree-ring stable oxygen and hydrogen in isotopes Reviewed International coauthorship International journal

Nakatsuka Takeshi, Sano Masaki, Li Zhen, Xu Chenxi, Tsushima Akane, Shigeoka Yuki, Sho Kenjiro, Ohnishi Keiko, Sakamoto Minoru, Ozaki Hiromasa, Higami Noboru, Nakao Nanae, Yokoyama Misao, Mitsutani Takumi

CLIMATE OF THE PAST Vol. 16 ( 6 ) page： 2153 - 2172 2020.11

Language：English Publishing type：Research paper (scientific journal) Publisher：Climate of the Past

Oxygen isotope ratios (δ18O) of tree-ring cellulose are a novel proxy for summer hydroclimate in monsoonal Asia. In central Japan, we collected 67 conifer wood samples, mainly Chamaecyparis obtusa, with ages encompassing the past 2600 years. The samples were taken from living trees, archeological wood, architectural wood, and buried logs. We analyzed stable isotope ratios of oxygen (δ18O) and hydrogen (d2H) in tree-ring cellulose in these samples (more than 15 000 rings in total) without using a pooling method and constructed a statistically reliable treering cellulose δ18O time series for the past 2500 years. However, there were distinct age trends and level offsets in the δ18O record, and cellulose δ18O values showed a gradual decrease as an individual tree matures. This suggested it is difficult to establish a cellulose δ18O chronology for lowfrequency signals by simple averaging of all the δ18O time series data. In addition, there were opposite age trends in the cellulose δ2H, and δ2H gradually increased with tree age. There were clear positive correlations in the short-periodicity variations between δ18O and δ2H, probably indicating a common climate signal. A comparison of the δ18O and δ2H time series in individual trees with tree-ring width suggested that the opposite age trends of δ18O and δ2H are caused by temporal changes in the degree of post-photosynthetic isotope exchange with xylem water (physiological effect), accompanied by changes in stem growth rate that are influenced by human activity in the forests of central Japan. Based on the assumptions that cellulose δ18O and δ2H vary positively and negatively with constant proportional coefficients due to climatological and physiological effects, respectively, we solved simultaneous equations for the climatological and physiological components of variations in tree-ring cellulose δ18O and δ2H in order to remove the age trend. This enabled us to evaluate the climatic record from cellulose δ18O vari ations. The extracted climatological component in the cellulose δ18O for the past 2600 years in central Japan was well correlated with numerous instrumental, historical, and paleoclimatological records of past summer climate at various spatial and temporal scales. This indicates that integration of tree-ring cellulose δ18O and δ2H data is a promising method to reconstruct past summer climate variations on annual to millennial timescales, irrespective of the growth environment. However, analytical and statistical methods need to be improved for further development of this climate proxy.

DOI： 10.5194/cp-16-2153-2020

Web of Science

Scopus

Tree-rings stable isotope (d(18)O and d(2)H) based 368 years long term precipitation reconstruction of South Eastern Kashmir Himalaya Reviewed International coauthorship

Pandey Uttam, Nakatsuka Takeshi, Mehrotra Nivedita, Zhen Li, Kato Yoshikazu, Sano Masaki, Shah Santosh K.

SCIENCE OF THE TOTAL ENVIRONMENT Vol. 892 page： 164640 2023.9

TWO NEW MILLENNIUM-LONG TREE-RING OXYGEN ISOTOPE CHRONOLOGIES (2349-1009 BCE AND 1412-466 BCE) FROM JAPAN Reviewed

Sano Masaki, Kimura Katsuhiko, Miyake Fusa, Tokanai Fuyuki, Nakatsuka Takeshi

RADIOCARBON Vol. 65 ( 3 ) page： 721 - 732 2023.6

Tree ring oxygen isotope dating of wood recovered from a canal in the ancient capital of Japan Reviewed

Sano Masaki, Li Zhen, Murakami Yumiko, Jinno Megumi, Ura Yoko, Kaneda Akihiro, Nakatsuka Takeshi

JOURNAL OF ARCHAEOLOGICAL SCIENCE-REPORTS Vol. 45 2022.10

Climate variation in ancient Japan inferred from tree-ring cellulose oxygen isotopic ratio Invited Reviewed

Takeshi NAKATSUKA

Bulletin of the National Museum of Japanese History Vol. 232 page： 11 - 30 2022.3

Simulation of variations in climate, agricultural production, and population during Yayoi and Kofun Eras using tree-ring oxygen isotopic ratios Invited Reviewed

Takeshi NAKATSUKA

Bulletin of the National Museum of Japanese History Vol. 231 page： 317 - 336 2022.2

Tree-ring oxygen isotope across monsoon Asia: Common signal and local influence Reviewed

Xu Chenxi, Zhao Qingyu, An Wenling, Wang Simon, Tan Ning, Sano Masaki, Nakatsuka Takeshi, Borhara Krishna, Guo Zhengtang

QUATERNARY SCIENCE REVIEWS Vol. 269 2021.10

Language：English Publisher：Quaternary Science Reviews

Tree-ring cellulose oxygen isotope (δ18O) in monsoon Asia (MA) is affected collectively by local hydroclimate and remote oceanic-atmospheric variations. Variations of tree-ring δ18O have been widely used for quantitative reconstructions of monsoon-season precipitation, relative humidity and drought severity. However, local hydroclimate and remote large-scale circulation's influences on tree-ring δ18O has not been fully resolved. Here, we collected 24 tree-ring δ18O chronologies covering the period of 1884–1999 across a wide range of MA and investigated the common signals of these chronologies using principal component analysis. The first principal component (PC1) of the 24 tree-ring δ18O chronologies explained 25.2% of the total variances and showed significant positive correlations with the observed Asian summer monsoon oxygen isotope index (r = 0.69) during the period of 1978–1999, suggesting that a common signal of precipitation δ18O does exist in MA and that it is highly correlated with El Niño–Southern Oscillation (ENSO) (r = 0.72) and the South Asian summer monsoon precipitation (r = −0.66). South Asian summer monsoon precipitation and ENSO are the main factors controlling this common signal of tree-ring δ18O across MA. PC1 of tree-ring δ18O chronologies in MA also depicted a negative (positive) correlation with the Atlantic Multidecadal Oscillation (Pacific Decadal Oscillation), indicating the large-scale circulation influences. After removing the large-scale circulation influences on tree-ring δ18O chronologies, however, the residual tree-ring δ18O chronologies exhibit negative correlations with the regional hydroclimate, highlighting the role local hydroclimate on the individual tree-ring δ18O variations.

DOI： 10.1016/j.quascirev.2021.107156

Web of Science

Scopus

古気候学者から歴史学者への協働の呼びかけ―現代の諸問題に対峙するために－ Invited

中塚武

日本史研究 Vol. 700 page： 147 - 162 2020.12

酸素同位体比年輪年代法－高精度編年への挑戦 Invited

中塚武

季刊考古学 Vol. 150 page： 142-145 2020.2

年輪を用いた南アルプスにおける1774 年以降の夏期気温の復元 Reviewed

安江恒, 久保典子, 赤尾実紀子, 佐野雅規, 中塚武

地学雑誌 Vol. 128 ( 1 ) page： 49-59 2019.2

Seasonal changes of δD and δ18O in tree-ring cellulose of Quercus crispula suggest a change in post-photosynthetic processes during earlywood growth. Reviewed International coauthorship International journal

Nabeshima E, Nakatsuka T, Kagawa A, Hiura T, Funada R

Tree physiology Vol. 38 ( 12 ) page： 1829 - 1840 2018.12

A 180-year-long isotopic record of tree-ring cellulose on Okinawa Island, Japan. Reviewed International journal

Ryu Uemura, Miki Uemura, Masaki Sano, Takeshi Nakatsuka

Vol. 52 page： e21-e27 2018.11

酸素同位体比年輪年代法による池島・福万寺遺跡の弥生時代水田に関する年代観の構築

井上智博, 中塚武, 李貞, 對馬あかね, 佐野雅規, 遠部慎, 中原計

大阪文化財研究 Vol. 51 page： 1-26 2018.3

酸素同位体比年輪年代法の誕生と展開 Invited Reviewed

中塚　武

考古学と自然科学 Vol. 76 page： 1-13 2018.3

『CD-ROM版鎌倉遺文』に収録された古文書件数と気候復元データの関係の定量的分析 Invited Reviewed

伊藤啓介, 中塚武

鎌倉遺文研究 Vol. 40 page： 23-53 2017.10

Recent enhancement of central Pacific El Niño variability relative to last eight centuries. Reviewed International coauthorship International journal

Liu Y, Cobb KM, Song H, Li Q, Li CY, Nakatsuka T, An Z, Zhou W, Cai Q, Li J, Leavitt SW, Sun C, Mei R, Shen CC, Chan MH, Sun J, Yan L, Lei Y, Ma Y, Li X, Chen D, Linderholm HW

Nature communications Vol. 8 page： 15386 2017.5

Tree-ring oxygen isotope cross-dating between southeastern China and central Japan Reviewed International coauthorship

Shi S., Shi J., Nakatsuka T., Sano M., Li Z., Shu J., Wang X., Huang J., Li J., Lu H.

Dendrochronologia Vol. 91 2025.6

Reconstruction of drought and long-rain chronologies since the 17th century in central Japan using intra-annual tree-ring oxygen isotope ratios and documentary records Reviewed

Iizuka, H; Sho, K; Li, Z; Sano, M; Kato, Y; Nakatsuka, T

CLIMATE OF THE PAST Vol. 21 ( 1 ) page： 133 - 144 2025.1

Method to measure tree-ring width, density, elemental composition, and stable carbon and oxygen isotopes using one sample Reviewed International coauthorship

Xu, CX; Zhao, YR; An, WL; Zhao, QY; Liu, YC; Sano, M; Nakatsuka, T

JOURNAL OF FORESTRY RESEARCH Vol. 35 ( 1 ) 2024.12

Methodological constrains of tree-ring stable isotope chronologies Reviewed

Tito Arosio, Max Torbenson, Tatiana Bebchuk, Alexander Kirdyanov, Jan Esper, Takeshi Nakatsuka, Masaki Sano, Otmar Urban, Kurt Nicolussi, Markus Leuenberger, Ulf Büntgen

Quaternary Science Reviews Vol. 340 page： 108861 2024.9

A 1179-yr (417-1595 CE) tree-ring oxygen isotope chronology for northern Japan validated using the 774-775 CE radiocarbon spike Reviewed

Sano, M; Li, Z; Tsushima, A; Kimura, K; Nakamura, T; Ohyama, M; Sakamoto, M; Nakatsuka, T; Hakozaki, M

RADIOCARBON 2024.5

Summer climate information recorded in tree-ring oxygen isotope chronologies from seven locations in the Republic of Korea Reviewed International coauthorship Open Access

Choi, EB; Park, JH; Sano, M; Nakatsuka, T; Seo, JW

FRONTIERS IN FORESTS AND GLOBAL CHANGE Vol. 7 2024.4

Toward International Collaborations of Interdisciplinary Studies and Citizen Sciences Invited Reviewed

Nkakatsuka Takeshi

Journal of Japanese Scientists Vol. 59 ( 5 ) page： 32 - 37 2024

Intra-annual oxygen isotopic variations of Pterocarya rhoifolia collected at Ashiu Research Forest, Kyoto

YUMIKO WATANABE, Kitou Katayama, Li Zhen, Takeshi Nakatsuka

Abstracts of Annual Meeting of the Geochemical Society of Japan Vol. 71 ( 0 ) page： 121 2024

Intra-Annual Isotope Records from Japanese Cedar Tree Samples in Akita Prefecture

Minghao Luo, YUMIKO WATANABE, Li Zhen, Takeshi Nakatsuka

Abstracts of Annual Meeting of the Geochemical Society of Japan Vol. 71 ( 0 ) page： 120 2024

Language：Japanese Publisher：GEOCHEMICAL SOCIETY OF JAPAN

Tree-ring width, density, and isotopic data can be used for paleoclimate reconstruction. Recently, due to the advantage of being less affected by tree physiological factors, the use of tree-ring cellulose isotope ratios in paleoclimate reconstruction has become a new research focus. Specifically, intra-annual isotope ratios have shown high-resolution potential for paleoclimate reconstruction, with feasibility demonstrated in multiple studies in central Japan. However, such high-resolution paleoclimate reconstruction studies in the relatively high-latitude region of northern Japan are still relatively scarce. Therefore, in this study, we collected tree-ring samples from northern Japan to explore whether the same reconstruction methods are applicable to this colder climate region.

DOI： 10.14862/geochemproc.71.0_120

CiNii Research

RADIOCARBON DATING OF TREE RINGS FROM THE BEGINNING AND END OF THE YAYOI PERIOD, JAPAN Reviewed

Sakamoto Minoru, Hakozaki Masataka, Nakatsuka Takeshi, Ozaki Hiromasa

RADIOCARBON 2023.8

Assessments of tree-ring intra-annual & delta;O-18 record for reconstructing hydroclimate with high temporal resolution Reviewed

Watanabe Yumiko, Katayama Yoshito, Li Zhen, Nakatsuka Takeshi, Tazuru Suyako

GEOSCIENCE LETTERS Vol. 10 ( 1 ) 2023.6

Temporal changes of stable sulfur isotope ratios in tree rings of two giant Cryptomeria japonica

Shiode Ayumi, Tanikawa toko, Hirano Yasuhiro, Nakatsuka Takeshi, Kato Yoshikazu, Ishida Takuya, Sase Hiroyuki

The Japanese Forest Society Congress Vol. 134 ( 0 ) page： 503 2023.5

A WIGGLE-MATCHED 297-YR TREE-RING OXYGEN ISOTOPE RECORD FROM THAILAND: INVESTIGATING THE C-14 OFFSET INDUCED BY AIR MASS TRANSPORT FROM THE INDIAN OCEAN Reviewed International coauthorship

Sano Masaki, Pumijumnong Nathsuda, Fujita Koji, Hakozaki Masataka, Miyake Fusa, Nakatsuka Takeshi

RADIOCARBON Vol. 65 ( 2 ) page： 505 - 519 2023.4

Asian-Australian summer monsoons linkage to ENSO strengthened by global warming Reviewed International coauthorship

Xu Chenxi, Wang S. -Y. Simon, Borhara Krishna, Buckley Brendan, Tan Ning, Zhao Yaru, An Wenling, Sano Masaki, Nakatsuka Takeshi, Guo Zhengtang

NPJ CLIMATE AND ATMOSPHERIC SCIENCE Vol. 6 ( 1 ) 2023.2

The modulation of Pacific Decadal Oscillation on ENSO-East Asian summer monsoon relationship over the past half-millennium Reviewed International coauthorship

Hau Nguyen-Xuan, Sano Masaki, Nakatsuka Takeshi, Chen Shin-Hao, Chen I. -Ching

SCIENCE OF THE TOTAL ENVIRONMENT Vol. 857 ( Pt 2 ) page： 159437 2023.1

愛知県出土材の年輪幅に基づく中世ヒノキ標準年輪曲線（1087–1574 年）の構築． Reviewed

佐野雅規・大石恭平・樋上　昇・中塚　武

文化財科学 Vol. 86 page： 37 - 38 2023

Quantification of drought and long-rain records in historical documents using tree-ring oxygen isotope ratios

Iizuka Hiroto, Syo Kenjiro, Li Zhen, Kato Yoshikazu, Nakatsuka Takeshi

Proceeding of Annual Conference Vol. 36 ( 0 ) page： 17 2023

Interdecadal to Multidecadal Variability of East Asian Summer Monsoon Over the Past Half Millennium Reviewed International coauthorship

Shi Feng, Goosse Hugues, Li Jianping, Yin Qiuzhen, Ljungqvist Fredrik Charpentier, Lian Tao, Sun Cheng, Wang Lin, Wu Zhiwei, Li Juan, Zhao Sen, Xu Chenxi, Liu Wei, Liu Ting, Nakatsuka Takeshi, Guo Zhengtang

JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES Vol. 127 ( 20 ) 2022.10

Different moisture regimes during the last 150 years inferred from a tree-ring delta O-18 network over the transitional zone of the Asian summer monsoon Reviewed International coauthorship

Fan Haowen, Gou Xiaohua, Nakatsuka Takeshi, Li Zhen, Fang Keyan, Su Jiajia, Gao Linlin, Liu Wenhuo

JOURNAL OF HYDROLOGY Vol. 613 2022.10

Different moisture regimes during the last 150 years inferred from a tree-ring δ18O network over the transitional zone of the Asian summer monsoon

Fan H., Gou X., Nakatsuka T., Li Z., Fang K., Su J., Gao L., Liu W.

Journal of Hydrology Vol. 613 2022.10

Publisher：Journal of Hydrology

The East Asian summer monsoon (EASM) and Indian summer monsoon (ISM) are two interactive climate systems dominating the moisture variability of Monsoon Asia. However, ISM-EASM interactions and their effects on regional moisture dynamics remain unclear. This study investigated the spatiotemporal characteristics of monsoon-related hydroclimate variability by establishing a new tree-ring oxygen isotope ratio (δ18Otree) network of eight δ18Otree records covering the last 150 years in southern China, which differs from previous studies that used data from individual sites. The δ18Otree chronologies were found to be sensitive to regional hydroclimatic changes during the monsoon season. The δ18Otree network indicated an east–west clustering pattern in the ISM-EASM transitional zone, which demonstrates an asynchrony in δ18Otree variability in the west and east of this region. Regional variability of the west and east δ18Otree modes reflected the different moisture signals, as indicated by their significant correlations with modern observations and paleo-δ18O records in disparate upstream regions of moisture transport (the Indochina Peninsula and Southeast China). This finding was confirmed by the east–west distinct pattern of spatial isotopic depletion of monsoon rainfall that originates from coastal areas of tropical oceans (Bay of Bengal and South China Sea) to the study area, as well as the consistent present-day pattern of atmospheric vapor transport during the monsoon season. In addition, the west and east modes exhibited stronger associations with ISM variability, whereas the east–west δ18Otree gradient captured the EASM-related hydroclimatic signal, suggesting that summer moisture variability in the ISM-EASM transitional zone was regulated more by ISM than by EASM during the last 150 years. The relationships between δ18Otree and large-scale ocean–atmosphere interaction modes revealed that the El Niño-Southern Oscillation (ENSO) dominantly modulates δ18Otree variability across southern China.

DOI： 10.1016/j.jhydrol.2022.128484

Scopus

Water Resource Management Implications for a Desert Oasis From Tree-Ring delta O-18 Variations in Populus Euphratica in Northwest China Reviewed International coauthorship

Li Qiang, Liu Yu, Meko David M., Nakatsuka Takeshi, Pan Yingnan, Song Huiming, Liu Ruoshi, Sun Changfeng, Fang Congxi

WATER RESOURCES RESEARCH Vol. 58 ( 4 ) 2022.4

Book Review 1: Valerie Trouet, Tree Story - The History of the World Written in Rings. Invited

NAKATSUKA, Takeshi

SHI’EN (The Journal of Historical Studies, Rikkyo University) Vol. 82 ( 2 ) page： 155 - 161 2022.3

気候変動と人間社会の歴史的関係から学ぶ－「変化」の速さに着目して Invited

中塚武

学術の動向 Vol. 27 ( 2 ) page： 31 - 35 2022.2

Lesson From Historical Relationship Between Climate Variation and Human Society With Special Focus on the Speed of Change

NAKATSUKA Takeshi

TRENDS IN THE SCIENCES Vol. 27 ( 2 ) page： 2_31 - 2_35 2022.2

樹木年輪古気候学の現状と課題：バレリー・トロエ『年輪で読む世界史』

中塚武

史苑 Vol. 82/2 page： 155 - 161 2022

奄美リュウキュウマツ年輪酸素同位体比データと海洋変動指数との関連性

増岡晃大, 庄建治朗, 中塚武, 李貞

水文・水資源学会研究発表会要旨集 Vol. 35 ( 0 ) page： 115 2022

Language：Japanese Publisher：水文・水資源学会

樹木年輪セルロース酸素同位体比は過去の気候変動をよく反映していることが確かめられている。近年では，年輪に含まれる酸素同位体比の測定手法の発達により，より純粋な気象因子との結びつきを検討できる可能性が期待されている．一方で樹木年輪の既往研究の多くは１年輪の測定により行われており，１年の時間分解能を持つデータが一般的である．そのため気候変動や海洋変動が日本陸域へ及ぼす季節ごとの影響を検討することが困難な場合がある．本研究では１年輪を年層内分割し得られた酸素同位体比データを用いて，気象代替データの時間分解能向上と年輪から考えられる海洋変動による陸域での季節変動について検討する．奄美大島の樹齢２００年のリュウキュウマツ３個体を対象として、年輪を形成するセルロースの抽出を行う。セルロース試料から測定サンプルを切り分ける際に、各年輪を成長方向へ分割する。測定データを用いて海洋変動が南西諸島陸域にもたらす影響を検討するために複数の海洋因子との相関分析を行う．結果としてENSO、PDOとの強い関連は得られなかった。一部年層内の成長期の終わり（11月頃）に相当する部分の酸素同位体比とENSOの間で正相関が得られた。ラニーニャ発生時期に奄美周辺の11月頃の日照時間が低下することが、同位体比変動に現れたと考えられる。一方でNPGOに関しては、1年遅いNPGOと梅雨入りに相当する部分の酸素同位体比、４年先行したNPGOと年層内の成長期の始まり（4月頃）に相当する部分の酸素同位体比との正相関が得られた。先行研究で東北地方を対象とした年輪同位体比と初夏の報告があり、東北地方のみならず南西諸島にも関連した指標であると考えられる。以上のように年輪の年層内分割は季節性の代替データを提供するとともに、大規模な海洋変動が陸域へ及ぼす関係を検討するのに有効な手段になると考えられる。

DOI： 10.11520/jshwr.35.0_115

CiNii Research

纒向遺跡の出土材年輪年代決定に向けて―酸素同位体比の年層内変動解析

中塚武

纒向学研究 Vol. 10 page： 309 - 316 2022

温暖化が駆動する大気海洋相互作用－樹木とサンゴの年輪共同研究の重要性

中塚武

月刊海洋 Vol. 622 page： 441 - 451 2022

樹木年輪の水素・酸素同位体比の統合による長期気候変動の復元

中塚武

月刊地球 Vol. 44 page： 255 - 266 2022

シリーズ『気候変動から読みなおす日本史』をめぐって

中塚武, 三木敦朗

日本の科学者 Vol. 57 ( 1 ) page： 46 - 51 2022

[書評] 樹木年輪古気候学の現状と課題－バレリー・トロエ『年輪で読む世界史』

中塚武

史苑 Vol. 82 page： 155 - 161 2022

樹木年輪酸素同位体比の周期性からみた「高地性集落」の背景

中塚武

古代文化 Vol. 74 page： 68 - 75 2022

Spatial synchrony in delta O-18 time-series from a tree-ring network are driven by synchronous hydroclimate variability in the transitional zone of the Asian summer monsoon Reviewed International coauthorship International journal

Fan Haowen, Gou Xiaohua, Nakatsuka Takeshi, Li Zhen, Su Jiajia, Sano Masaki, Liu Wenhuo, Fang Keyan

AGRICULTURAL AND FOREST METEOROLOGY Vol. 311 2021.12

Language：English Publishing type：Research paper (scientific journal)

Owing to the increased need to assess global forest behavior under changing climatic conditions within a long-term context, spatial coherence in tree-ring records is of widespread interest. Spatial networks of tree growth have been widely discussed from regional to global scales, but few studies have reported stable oxygen isotopes in networks of tree rings (δ18Otree), thus impeding a comprehensive hydroclimatic interpretation of δ18Otree records over large spatial scales, i.e., isoscapes. In this study, a network of four annually resolved δ18Otree chronologies (1805–2016) was developed for Southwest China, the transitional zone of the Asian summer monsoon, to test spatial coherence in δ18Otree variations and to explore the climatic factors driving synchrony at different spatial scales. The quantitative analyses show that the four chronologies exhibit consistent annual variations, with the first principal component (PC1) accounting for 70% of the total variance, which uniformly respond to local relative humidity (RH) and precipitation δ18O during the monsoon season. This confirms the spatial coherence in δ18Otree records. Furthermore, significant inter-site correlations of local RH and precipitation δ18O are also detected, revealing that it is the regionally homogeneous year-to-year variations in the hydroclimate that should be responsible for spatial coherence. For a larger spatial perspective, spatial correlation analyses reveal that the most prominent correlations between δ18Otree and hydroclimate fields occur in the Indochina Peninsula, in which δ18Otree changes are synchronized with those in Southwest China and the synchrony temporally varies with the Indian summer monsoon (ISM) intensity, indicating that coherent δ18Otree variations are linked to ISM-related moisture transport. In addition, δ18Otree records have shown strong in-phase relationships with the natural variabilities of the ISM and El Niño-Southern Oscillation (ENSO) across interannual and interdecadal timescales over the last 150 years, suggesting that spatial coherence in δ18Otree records can be utilized to reflect the long-term history of large-scale atmospheric circulation.

DOI： 10.1016/j.agrformet.2021.108687

Web of Science

Scopus

A seamless climate reconstruction beyond periodicity - Discovery of multi-decadal variability critical for human and natural sciences Invited

Nakatsuka Takeshi

Abstracts of Annual Meeting of the Geochemical Society of Japan Vol. 68 ( 0 ) page： 53 2021.9

Authorship：Lead author Language：Japanese Publishing type：Research paper (conference, symposium, etc.) Publisher：GEOCHEMICAL SOCIETY OF JAPAN

A seamless reconstruction of summer climate variation for all periodicities has been carried out in central Japan by integrating tree-ring oxygen and hydrogen isotopes. By decomposing the time series, I have found that the amplitude of multi-decadal variations is enhanced at every 400 years, inducing societal regime shifts over East Asia. I will discuss its natural and human scientific meanings referring the results of an inter-disciplinary research project in Research Institute for Humanity and Nature.

DOI： 10.14862/geochemproc.68.0_53

CiNii Research

Onset and maturation of Asian summer monsoon precipitation reconstructed from intra-annual tree-ring oxygen isotopes from the southeastern Tibetan Plateau

Xu Chenxi, Zhu Haifeng, Wang S-Y Simon, Shi Feng, An Wenling, Li Zhen, Sano Masaki, Nakatsuka Takeshi, Guo Zhengtang

QUATERNARY RESEARCH Vol. 103 page： 139 - 147 2021.9

Language：Japanese Publisher：Quaternary Research (United States)

We present a long-term seasonal tree ring cellulose oxygen isotope (δ18Oc) time series created by analyzing four segments (S1, S2, S3, and S4) per year during the period of 1951-2009 from southeastern Tibetan Plateau. This intraseasonal δ18Oc reveals the onset and mature phase of the summer monsoon precipitation in this region. Analysis indicates that the δ18Oc of S1 has the strongest correlation with precipitation during the regional monsoon onset (29-33 pentads, May 21-June 10, r =-0.69), and the δ18Oc values for S2, S3, and S4 correlate strongly with June, July, and August precipitation, respectively. Combined δ18Oc of S2, S3, and S4 shows the most robust correlation (r =-0.82) with the mature-phase monsoon precipitation (June-July-August, JJA), passing rigorous statistical tests for calibration and verification in dendroclimatology. These results demonstrate the feasibility in using long-term intraseasonal δ18Oc to reconstruct the Asian summer monsoon's intraseasonal variations.

DOI： 10.1017/qua.2020.28

Web of Science

Scopus

Oxygen Isotopes in Tree Rings from Greenland: A New Proxy of NAO Reviewed International coauthorship International journal

Xu Chenxi, Buckley Brendan M., Wang Shih-Yu Simon, An Wenling, Li Zhen, Nakatsuka Takeshi, Guo Zhengtang

ATMOSPHERE Vol. 12 ( 1 ) 2021.1

Language：Japanese Publishing type：Research paper (scientific journal) Publisher：Atmosphere

We present the first Greenlandic tree ring oxygen isotope record (δ18OGTR), derived from four birch trees collected from the Qinguadalen Valley in southwestern Greenland in 1999. Our δ18O record spans from 1950–1999 and is significantly and positively correlated with winter ice core δ18O from southern Greenland. δ18OGTR records are positively correlated with southwestern Greenland January–August mean temperatures. North Atlantic Oscillation (NAO) reconstructions have been developed from a variety of proxies, but never with Greenlandic tree rings, and our δ18OGTR record is significantly correlated with NAO (r = −0.64), and spatial correlations with sea-level pressure indicate a classic NAO pressure seesaw pattern. These results may facilitate a longer NAO reconstruction based on long time series of tree ring δ18O records from Greenland, provided that subfossil wood can be found in areas vacated by melting glaciers.

DOI： 10.3390/atmos12010039

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大規模土砂移動発生履歴の高精度復元に向けた埋没樹木の年代測定－歴史時代に中部山岳地域で発生した事例－ Reviewed

山田隆二・木村　誇・苅谷愛彦・佐野雅規・對馬あかね・李　貞・中塚　武・國分（齋藤）陽子・井上公夫

砂防学会誌 Vol. 73 page： 3 - 14 2021.1

Delayed warming in Northeast China: Insights from an annual temperature reconstruction based on tree-ring delta O-18 Reviewed International coauthorship International journal

Li Qiang, Liu Yu, Nakatsuka Takeshi, Liu Ruoshi, Cai Qiufang, Song Huiming, Wang Shengjie, Sun Changfeng, Fang Congxi

SCIENCE OF THE TOTAL ENVIRONMENT Vol. 749 page： 141432 2020.12

Language：Japanese Publishing type：Research paper (scientific journal) Publisher：Science of the Total Environment

Global warming has had an unprecedented impact on environmental changes and thus human life in mid-high latitude regions. As one of the areas most affected by global warming, Northeast China has suffered from a series of ecological crises, including warming-induced water deficits, permafrost thaw, and extended growing seasons. The change in annual average temperature (annual T) variations in Northeast China since the Industrial Revolution are still not fully understood, mainly because of the lack of long-term instrumental data and high-resolution annual T reconstructions. Here, we present the first annual T reconstruction (r = −0.683, p <.001, n = 60) for 1818–2012 in Northeast China, which may also be the first temperature reconstruction based on tree-ring δ18O in China. The reconstruction is significantly related to temperature variations over mid-high latitude Eurasia and agree (p <.01) with several long-term hydroclimatic reconstructions in the surrounding area. When the internal variability in the reconstruction was high, the decadal to multidecadal cycles were significant. Further analysis found that the reconstruction was mainly affected by the East Asian Summer Monsoon (EASM) and North Atlantic Oscillation (NAO). The reconstruction was significantly negatively correlated with several time series of annual T in the Northern Hemisphere, which showed that there is a substantial difference in annual T between Northeast China and other regions of the Northern Hemisphere. The difference mainly existed before the 1950s. From the 1850s to the 1950s, the annual T in Northeast China decreased slightly. However, extreme warming began in the 1950s in Northeast China, and this warming has been unprecedented during the past two centuries. If the warming trend since the 1950s continues, then it will lead to devastating disasters to forest and permafrost ecosystems in Northeast China.

DOI： 10.1016/j.scitotenv.2020.141432

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PubMed

Unstable relationship between tree-ring delta O-18 in the transitional zone of the Asian summer monsoon and the Indian summer monsoon Reviewed International coauthorship International journal

Fan Haowen, Gou Xiaohua, Su Jiajia, Liu Wenhuo, Gao Linlin, Nakatsuka Takeshi, Li Zhen, Sano Masaki, Lin Wei

JOURNAL OF HYDROLOGY Vol. 590 2020.11

Language：Japanese Publishing type：Research paper (scientific journal) Publisher：Journal of Hydrology

The Asian Summer Monsoon system (ASM) affects a large population in the monsoonal Asia. Previous studies have thoroughly discussed the temporally unstable response of tree-ring oxygen isotope (δ18O) to the regional climate variables and ocean–atmosphere interaction modes, however, the response to the ASM remains ambiguous. In this study, an annually resolved tree-ring δ18O chronology is developed from eastern Yunnan-Guizhou Plateau, in the transitional zone of the ASM. Based on the results from response analyses, the climatic controls of tree-ring δ18O is considered to be the moisture-related variables of the monsoon season. Spatial correlations suggest that in the study area, the water vapor is mainly originated from the Bay of Bengal and transported by the Indian Summer Monsoon (ISM). Furthermore, the temporal stability in relationships between the tree-ring δ18O and the ISM variability are explored. Our findings suggest that on interannual to decadal timescales, the tree-ring δ18O is significantly anti-correlated, but temporally unstable with respect to the ISM. The strength of interannual relationship is affected by the ISM intensity, which is modulated by the El Niño-Southern Oscillation (ENSO) and the Indian Ocean Dipole (IOD) variability. Moreover, the strength of decadal relationship is associated with the phase shift of the Pacific Decadal Oscillation (PDO). Additionally, the decreasing trend of tree-ring δ18O after the late 1970 s that diverges from the simultaneous normal level of the ISM is caused by the isotopically-depleted trend in upstream precipitation of the moisture source. The opposite patterns of correlations between the tree-ring δ18O and the ENSO and IOD in recent decades demonstrate that the regional hydroclimate in the study region has been undergoing significant secular variations that are characterised by an increasing effect of the IOD and a decreasing effect of the ENSO. The findings from this study further improve our understanding of the tree-ring δ18O response to the ASM, at multi-time scales, and shed light on the impact of the ASM on regional hydroclimate variability, across the transitional zone of the ASM.

DOI： 10.1016/j.jhydrol.2020.125522

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Synchronizations of tree-ring delta O-18 time series within and between tree species and provinces in Korea: a case study using dominant tree species in high elevations Reviewed International coauthorship International journal

Choi En-Bi, Sano Masaki, Park Jun-Hui, Kim Yo-Jung, Li Zhen, Nakatsuka Takeshi, Hakozaki Masataka, Kimura Katsuhiko, Jeong Hyun-Min, Seo Jeong-Wook

JOURNAL OF WOOD SCIENCE Vol. 66 ( 1 ) 2020.7

Language：Japanese Publishing type：Research paper (scientific journal) Publisher：Journal of Wood Science

The current study was initiated to test the synchronizations of tree-ring δ18O (hereafter δ18OTR) time series within and between tree species and provinces, which are about 144 km apart from each other in Korea. For the test, a 50-year δ18OTR time series (1966–2015) was developed using four trees from each tree species which are Pinus densiflora and Quercus mongolica from Songnisan National Park and Taxus cuspidata, Pinus koraiensis, Abies koreana, and Quercus mongolica from Jirisan National Park. Their synchronizations were evaluated using t-value, Gleichläufigkeit (Glk), and Expressed Population Signal (EPS). The mean t-values and Glk scores within the tree species ranged 5.2–11.2 (p < 0.05) and 69–83%, and between the tree species ranged 6.1–13.2 (p < 0.05) and 73–81%, respectively. The mean t-value and Glk score between the regions were 4.3 (p < 0.05) and 72%, respectively. Furthermore, the EPS showed higher than 0.85, which is the generally accepted threshold value in dendrochronology, except for Q. mongolica at Songnisan National Park for which the value is 0.83 calculated by only two δ18OTR time series. Based on the statistical results, we concluded that a δ18OTR chronology established using more than four trees could serve as a promising reference for dating an undated wood without considering the tree species, as well as for research on climate in the past.

DOI： 10.1186/s10086-020-01901-3

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An assessment of diatom assemblages in the Sea of Okhotsk as a proxy for sea-ice cover Reviewed International coauthorship International journal

Nakamura H

Journal of Micropalaeontology Vol. 39 ( 1 ) page： 77 - 92 2020.6

Language：Japanese Publishing type：Research paper (scientific journal) Publisher：COPERNICUS GESELLSCHAFT MBH

Knowledge of past variations in sea-ice extent is crucial for understanding the relationship between climate change and changes in sea ice. Diatom assemblages could be applied as a proxy for paleo-sea-ice extent; this requires accurate information on the modern species that are indicative of sea ice. Scanning electron microscope observations were performed on modern diatom assemblages in sea ice, sinking particles, and surface sediments in the Sea of Okhotsk. A sea-ice sample was collected in the southwestern Sea of Okhotsk near Hokkaido island in February 2013. Fragilariopsis cylindrus was the dominant diatom species in the sea-ice sample, accounting for 87% of the total diatom assemblage. Time-series sediment traps were deployed during 1998-2000 at two stations, M4 and M6, off Sakhalin island. Total diatom fluxes ranged from 10(5) to 10(8) valves m(-2) d(-1) with noticeable seasonality. During the sea-ice covering period, the total diatom flux decreased by 1 or 2 orders of magnitude. The highest diatom fluxes were observed in spring and summer. The diatom species composition in sinking particles also showed pronounced seasonal changes. During summer and fall, the Shionodiscus trifultus group and Neodenticula seminae were the major diatom taxa. During the sea-ice covering period, Fragilariopsis cylindrus and Bacterosira bathyomphala resting spores were abundant. Both the sea-ice-related species showed similar flux patterns except for the spring bloom after sea-ice retreat: F. cylindrus fluxes exhibited pronounced spring bloom peaks of 10(8) valves m(-2) d(-1); in contrast, the fluxes of Bacterosira bathyomphala resting spores during the spring bloom were 1 order of magnitude lower than those of F. cylindrus. Surface-sediment core XP98-MC4 was obtained near station M6 sediment-trap site off Sakhalin island. The relative abundance of Fragilariopsis cylindrus in the surface-sediment diatom assemblage was only 6.4 %, markedly lower than that in the sediment-trap samples (43.4 %). In the surface sediment, the relative abundances of diatom taxa with heavily silicified valves such as B. bathyomphala resting spores, Shionodiscus variantius, and Thalassionema nitzschioides were greater than their relative abundances in sinking particles.

DOI： 10.5194/jm-39-77-2020

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A 338-year tree-ring oxygen isotope record from Thai teak captures the variations in the Asian summer monsoon system. Reviewed International coauthorship International journal

Pumijumnong N, Bräuning A, Sano M, Nakatsuka T, Muangsong C, Buajan S

Scientific reports Vol. 10 ( 1 ) page： 8966 2020.6

Oxygen stable isotopes of a network of shrubs and trees as high-resolution plaeoclimatic proxies in Northwestern China. Reviewed International coauthorship International journal

Qiang Li, Yu Liu, Takeshi Nakatsuka, Qi-Bin Zhang, Keiko Ohnishi, Akiko Sakai, Osamu Kobayashi, Yingnan Pan, Huiming Song, Ruoshi Liu, Changfeng Sun, Congxi Fang

Agricultural and Forest Meteorology Vol. 285 2020.5

Climate variability over the past 100 years in Myanmar derived from tree-ring stable oxygen isotope variations in Teak Reviewed International coauthorship International journal

Pumijumnong, N, Muangsong, C, Buajan, S, Sano, M, Nakatsuka, T

Theoretical and Applied Climatology Vol. 139 ( 3-4 ) page： 1401 - 1414 2020.2

酸素同位体比年輪年代法－高精度編年への挑戦 Invited

中塚　武

季刊考古学 Vol. 150 page： 142-145 2020.2

Reconstruction of multi-millennial summer climate variations in central Japan by integrating tree-ring cellulose oxygen and hydrogen isotope ratios Reviewed International coauthorship International journal

Nakatsuka, T, Sano, M, Li, Z, Xu, C, Tsushima, A, Shigeoka, Y, Sho, K, Ohnishi, K, Sakamoto, M, Ozaki, H, Higami, N, Nakao, N, Yokoyama, M, Mitsutani, T

Climate of the Past Discussion 2020.2

Specific response of earlywood and latewood δ18O from the east and west of Mt. Qomolangma to the Indian summer monsoon. Reviewed International coauthorship International journal

An W, Xu C, Liu X, Tan N, Sano M, Li M, Shao X, Nakatsuka T, Guo Z

The Science of the total environment Vol. 689 page： 99 - 108 2019.11

Oxygen isotope ratios of subalpine conifers in Jirisan National Park, Korea and their dendroclimatic potential. Reviewed International coauthorship International journal

Jeong-Wook Seo, Masaki Sano, Hyun-Min Jeong, Kwang-Hee Lee, Hong-Chul Park, Takeshi Nakatsuka, Chang-Seob Shin

Dendrochronologia Vol. 57 2019.10

Sampling strategy and climatic implication of tree-ring cellulose oxygen isotopes of Hippophae tibetana and Abies georgei on the southeastern Tibetan Plateau. International coauthorship International journal

Xu C, Zhu H, Nakatsuka T, Sano M, Li Z, Shi F, Liang E, Guo Z

International journal of biometeorology Vol. 63 ( 5 ) page： 679 - 686 2019.5

Increased drought events in southwest China revealed by tree ring oxygen isotopes and potential role of Indian Ocean Dipole. Reviewed International coauthorship International journal

Xu C, An W, Wang SS, Yi L, Ge J, Nakatsuka T, Sano M, Guo Z

The Science of the total environment Vol. 661 page： 645 - 653 2019.4

Increased variability of Thailand's Chao Phraya River peak-season flow and its association with ENSO variability: Evidence from tree ring δ18O. Reviewed International coauthorship International journal

Chenxi Xu, Brendan M. Buckley, Parichart, Promchote, S. Y, Simon Wang, Nathsuda Pumijumnong, Wenling An, Masaki Sano, Takeshi Nakatsuka, Zhengtang Guo

Geophysical Research Letters 2019.4

島根県出土材の酸素同位体比年輪年代法による年代決定

中塚武

古代文化研究（島根県古代文化センター） Vol. 27 page： 1 - 16 2019

酸素同位体比年輪年代法による高屋敷館遺跡東壕橋脚の年代検証

木村勝彦, 佐野雅規, 中塚武

青森市埋蔵文化財調査報告書 Vol. 124 page： 77 - 80 2019

Cellulose oxygen isotopic composition of teak (Tectona grandis) collected from Java Island: a tool for dendrochronological and dendroclimatological analysis International coauthorship International journal

Hisamochi Ryo, Watanabe Yumiko, Sano Masaki, Nakatsuka Takeshi, Kurita Naoyuki, Matsuo-Ueda Miyuki, Yamamoto Hiroyuki, Tazuru Suyako, Sugiyama Junji, Subiyanto Bambang, Marsoem Sri Nugroho, Tsuda Toshitaka, Tagami Takahiro

DENDROCHRONOLOGIA Vol. 52 page： 80 - 86 2018.12

Language：Japanese Publishing type：Research paper (scientific journal) Publisher：ELSEVIER GMBH, URBAN & FISCHER VERLAG

The oxygen isotopic composition (delta O-18) of tree-ring cellulose has been recognized as a powerful tool for dendroclimatological and dendrochronological investigations in Asia. Only a few studies of cellulose delta O-18 so far published, however, have been conducted in Indonesia, and the spatial coherence of cellulose delta O-18 has yet to be clarified. In this study we measured cellulose delta O-18 of teak (Tectona grandis) collected from four sites on Java Island to evaluate the similarity between the different teak delta O-18 values and the potential for using teak delta O-18 both as a climate proxy and as a tool for cross-dating. Cellulose delta O-18 time series of Javanese teaks were found to be significantly correlated in all of the comparisons between sites, even between sites separated by a distance as great as 400 km. While significant correlations did not appear in the ring width data between our samples (expressed population signal (EPS) = 0.64; Rbar = 0.23; sample depth = 10), they were found between the cellulose delta O-18 values (EPS = 0.89; Rbar = 0.58; sample depth = 10). These results suggest that teak delta O-18 variations have higher spatial coherence and might be a useful tool for cross-dating. A significant negative correlation was observed between cellulose delta O-18 and the relative humidity/precipitation during the rainy season, indicating that the cellulose delta O-18 of Javanese teak is an effective proxy for relative humidity/precipitation during the rainy season. Cellulose delta O-18 was found to be positively correlated with precipitation during the dry season preceding the growing season, whereas it showed no correlations with the temperature and Palmer Drought Severity Index (PDSI), the key constraints of delta O-18 on the Indochina Peninsula.

DOI： 10.1016/j.dendro.2018.09.010

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East Asian Summer Monsoon moisture sustains summer relative humidity in the southwestern Gobi Desert, China: evidence from δ18O of tree rings. Reviewed

Qiang Li, Yu Liu, Takeshi Nakatsuka, Keyan Fang, Huiming Song, Ruoshi Liu, Changfeng Sun, Gang Li, Ke Wang

Climate Dynamics 2018.10

Evaluation of the effect of the 2011 Tsunami on coastal forests by means of multiple isotopic analyses of tree-rings. International coauthorship International journal

Lopez Caceres ML, Nakano S, Ferrio JP, Hayashi M, Nakatsuka T, Sano M, Yamanaka T, Nobori Y

Isotopes in environmental and health studies Vol. 54 ( 5 ) page： 494 - 507 2018.10

Inter-annual and multi-decadal variability of monsoon season rainfall in central Thailand during the period of 1804-1999-inferred from tree ring oxygen isotopes. Reviewed

Chenxi Xu, Nathsuda Pumijumnong, Takeshi Nakatsuka, Masaki Sano, Zhengtang Guo

International Journal of Climatology Vol. 38 ( 15 ) page： 5766-5776 2018.9

Decreasing Indian summer monsoon on the northern Indian sub-continent during the last 180 years: evidence from five tree-ring cellulose oxygen isotope chronologies. Reviewed

Chenxi Xu, Masaki Sano, Ashok Priyadarshan Dimri, Rengaswamy Ramesh, Takeshi Nakatsuka, Feng Shi, and Zhengtang Guo

Climate of the Past Vol. 14 page： 653-664 2018.5

Early summer precipitation in the lower Yangtze River basin for AD 1845-2011 based on tree-ring cellulose oxygen isotopes Reviewed

Chenxi Xu, Jiangfeng Shi, Yesi Zhao, Takeshi Nakatsuka, Masaki Sano, Shiyuan Shi and Zhengtang Guo

Climate Dynamics 2018.4

多賀城跡出土西辺柵木の樹種 Invited

箱崎真隆・木村勝彦・中塚　武

多賀城跡（宮城県多賀城跡調査研究所年報） Vol. 2017 page： 40-41 2018.3

年輪酸素同位体比分析による多賀城跡西辺の柵木の年代決定 Invited

斉藤颯人, 木村勝彦, 箱崎真隆, 佐野雅規, 對馬あかね, 李貞, 中塚武

多賀城跡（宮城県多賀城跡調査研究所年報） Vol. 2017 page： 42-45 2018.3

三内丸山遺跡出土木材の酸素同位体分析 Invited

小林謙一・木村勝彦・佐野雅規・箱崎真隆・中塚　武

特別史跡三内丸山遺跡年報 Vol. 21 page： 43-61 2018.3

Age determination on a catastrophic rock avalanche using tree-ring oxygen isotope ratios - the scar of a historical gigantic earthquake in the Southern Alps, central Japan Reviewed

Ryuji Yamada, Yoshihiko Kariya, Takashi Kimura, Masaki Sano, Zhen LI, Takeshi Nakatsuka

Quaternary Geochronology Vol. 44 page： 47-54 2018.3

樹木年輪セルロースの酸素同位体比が明らかにした日本史の背後にある気候変動．

中塚武

海洋化学研究 Vol. 31 page： 101 - 106 2018

三内丸山遺跡出土木材の酸素同位体分析と年代研究

小林謙一, 木村勝彦, 箱崎真隆, 佐野雅規, 中塚武

特別史跡三内丸山遺跡年報 Vol. 21 page： 62 - 80 2018

Relationship between the Northern Paciic Gyre Oscillation and tree-ring cellulose oxygen isotopes in northeastern Japan. Reviewed

Wataru Sakashita, Hiroko Miyahara, Yusuke Yokoyama, Takahiro Aze, Stephen P. Obrochta and Takeshi Nakatsuka

Geoscience Letter Vol. 4 ( 29 ) 2017.12

Fine structure and reproducibility of radiocarbon ages of middle to early modern Japanese tree rings. Reviewed

Minoru Sakamoto, Masataka Hakozaki, Nanae Nakao and Takeshi Nakatsuka

Radiocarbon Vol. 59 page： 1907-1917 2017.12

高分解能古気候データを『日本書紀』の解釈に利用する際の留意点 Invited

中塚　武

日本書紀研究 Vol. 32 page： 155-171 2017.11

Negligible local-factor influences on tree ring cellulose δ18O of Qilian juniper in the Animaqing Mountains of the eastern Tibetan Plateau. Reviewed

Chenxi Xu, Xuemei Shao, Wenling An, Takeshi Nakatsuka, Yong Zhang, Masaki Sano and Zhengtang Guo

Tellus B: Chemical and Physical Meteorology Vol. 69 page： 1391663 2017.11

原始・古代史の時間認識と気候変動 Invited

中塚　武

歴博 Vol. 204 page： 15-18 2017.9

Reconstruction of short and long term variations of summer precipitation in central Japan by integrating of oxygen and hydrogen isotope ratios of tree ring cellulose

Nakatsuka Takeshi, Sano Masaki, Li Zhen, Tsushima Akane, Shigeoka Yuki

Abstracts of Annual Meeting of the Geochemical Society of Japan Vol. 64 ( 0 ) 2017.9

Moisture source signals preserved in a 242-year tree-ring δ18O chronology in the western Himalaya. Reviewed

Masaki Sano, A P Dimri, R. Ramesh, Chenxi Xu, Zhen Li, Takeshi Nakatsuka

Global and Planetary Change Vol. 157 page： 73-82 2017.8

Hydroclimate reconstruction in central Japan over the past four centuries from tree-ring cellulose δ18O. Reviewed

Wataru Sakashita, Hiroko Miyahara, Yusuke Yokoyama, Takahiro Aze, Takeshi Nakatsuka, Yasuharu Hoshino, Motonari Ohyama, Hitoshi Yonenobu, Keiji Takemura

Quaternary International 2017.6

Assessment of sungkai tree-ring delta O-18 proxy for paleoclimate reconstruction in western Java, Indonesia Reviewed International coauthorship International journal

Harada Mao, Watanabe Yumiko, Nakatsuka Takeshi, Tazuru-Mizuno Suyako, Horikawa Yoshiki, Subiyanto Bambang, Sugiyama Junji, Tsuda Toshitaka, Tagami Takahiro

QUATERNARY INTERNATIONAL Vol. 432 page： 33 - 38 2017.3

気候変動が古代日本人に与えたインパクト Invited

中塚武

科学 Vol. 87 page： 140-148 2017.2

高分解能古気候データから始まる新しい災害史研究の方向性 Invited Reviewed

中塚　武

国立歴史民俗博物館研究報告 Vol. 203 page： 9-26 2016.12

Analysis of the interdecadal variability of summer precipitation in central Japan using a reconstructed 106-year-long oxygen isotope record from tree-ring cellulose. Reviewed

Naoyuki Kurita, Takeshi Nakatsuka, Keiko Ohnishi, Takumi Mitsutani and Tomo'omi Kumagai

Journal of Geophysical Research-Atmosphere Vol. 121 ( 20 ) page： 12089-12107 2016.10

高分解能古気候データを用いた新しい歴史学研究の可能性 Invited Reviewed

中塚　武

日本史研究 Vol. 646 page： 3-18 2016.6

日本近世における年貢上納と気候変動－近世史研究における古気候データ活用の可能性をさぐる－ Invited Reviewed

鎌谷かおる・佐野雅規・中塚　武

日本史研究 Vol. 646 page： 36-56 2016.6

酸素同位体比年輪年代法がもたらす新しい考古学研究の可能性 Invited

中塚　武

考古学研究 Vol. 62 page： 17-30 2015.9

稲沢市下津宿遺跡出土井戸枠の酸素同位体比年輪年代測定結果について

樋上　昇・中塚　武・大石恭平

愛知県埋蔵文化財センター研究紀要 Vol. 16 page： 49-68 2015.5

平家はなぜ滅んだのか－気候変動という視点 Invited

中塚　武

HUMAN Vol. 7 page： 132-141 2014

A 400-year record of hydroclimate variability and local ENSO history in northern Southeast Asia inferred from tree-ring δ18O Reviewed

Xu, C., M. Sano and T. Nakatsuka

Palaeogeography, Palaeoclimatology, Palaeoecology Vol. 386 page： 588-598 2013.9

Fe/Al ratio of suspended particulate matter from intermediate water in the Okhotsk Sea: Implications for long-distance lateral transport of particulate Fe Reviewed

Shigemitsu, M., J. Nishioka, Y. W. Watanabe, Y. Yamanaka, T. Nakatsuka, Y. N. Volkov

Marine Chemistry Vol. 157 page： 41-48 2013.8

Decadal time evolution of ocean uptake of anthropogenic carbon in the Okhotsk Sea Reviewed

Watanabe Y. W., J. Nishioka and T. Nakatsuka

Geophysical Research Letter Vol. 40 2013

Summer precipitation in the Bhutan Himalaya since 1743 CE as reconstructed from tree-ring cellulose δ18O Reviewed

Sano, M., P. Tshering, J. Komori, K. Fujita, C. Xu and T. Nakatsuka

Journal of Geophysical Research Vol. 118 page： 1-12 2013

Availability of particulate Fe to phytoplankton in the Sea of Okhotsk Reviewed

Sugie, K., J. Nishioka, K. Kuma, Y. N. Volkov and T. Nakatsuka

Marine Chemistry Vol. 152 page： 20-31 2013

Continental-scale temperature variability during the last two millennia Reviewed

M. Ahmed, K. J. Anchukaitis, A. Asrat, H. P. Borgaonkar, M. Braida, B. M. Buckley, U. Büntgen, B. M. Chase, D. A. Christie, E. R. Cook, M. A. J. Curran, H. F. Diaz, J. Esper, Z. Fan, N. P. Gaire, Q. Ge, J. Gergis, J. F. González-Rouco, H. Goosse, S. W. Grab, N. Graham, R. Graham, M. Grosjean, S. T. Hanhijärvi, D. S. Kaufman, T. Kiefer, K. Kimura, A. A. Korhola, P. J. Krusic, A. Lara, A-M. Lézine, F. C. Ljungqvist, A. M. Lorrey, J. Luterbacher, V. Masson-Delmotte, D. McCarroll, J. R. McConnel, N. P. McKay, M. S. Morales, A. D. Moy, R. Mulvaney, I. A. Mundo, T. Nakatsuka, D. J. Nash, R. Neukom, S. E. Nicholson, H. Oerter, J. G. Palmer, S. J. Phipps, M. R. Prieto, A. Rivera, M. Sano, M. Severi, T. M. Shanahan, X. Shao, F. Shi, M. Sigl, J. E. Smerdon, O. N. Solomina, E. J. Steig, B. Stenni, M. Thamban, V. Trouet, C. S.M. Turney, M. Umer, T. van Ommen, D. Verschuren, A. E. Viau, R. Villalba, B. M. Vinther, L. von Gunten, S. Wagner, E. R. Wahl, H. Wanner, J. P. Werner, J. W. C. White, K. Yasue, E. Zorita

Nature Geoscience Vol. 6 page： 339-346 2013

Influence of Amur River discharge on phytoplankton 1 photophysiology in the Sea of Okhotsk during late summer Reviewed

Isada, T., T. Iida, H. Liu, S. Saitoh, J. Nishioka, T. Nakatsuka and K. Suzuki

Journal of Geophysical Research Vol. 118 page： 1995-2013 2013

Comparison of the dryness/wetness index in China with the Monsoon Asia Drought Atlas. Reviewed

Yang, F., F. Shi, S. Kang, S. Wang, Z. Xiao, T. Nakatsuka and J. Shi

Theoretical and Applied Climatology 2013

Comparison of Sungkai Tree-Ring Components and Meteorological Data from Western Java, Indonesia Reviewed

Watanabe, Y., S. Tamura, T. Nakatsuka, S. Tazuru, J. Sugiyama, B. Subiyanto, T. Tsuda, and T. Tagami

Journal of Disaster Research Vol. 8 page： 95-102 2013

Intensive mixing along an island chain controls oceanic Reviewed

Nishioka, J., T. Nakatsuka, Y. W. Watanabe, I. Yasuda, K. Kuma, H. Ogawa, N. Ebuchi, A. Scherbinin, Y. N. Volkov, T. Shiraiwa and M. Wakatsuchi

Global Biogeochemical Cycles Vol. 27 page： 1-10 2013

Tree-ring reconstructed summer temperature anomalies for temperate East Asia since 800 C.E Reviewed

Cook, E. R., P. J. Krusic, K. J. Anchukaitis, B. M. Buckley, T. Nakatsuka, M. Sano and PAGES Asia2k Members

Climate Dynamics Vol. 39 2012

A 300-year Vietnam hydroclimate and ENSO variability record reconstructed from tree-ring d18O Reviewed

Sano, M., C. Xu and T. Nakatsuka

Journal of Geophysical Research Vol. 117 2012

Sea surface temperature changes in the Okhotsk Sea and adjacent North Pacific during the last glacial maximum and deglaciation Reviewed

Harada, N., M. Sato, O. Seki, A. Timmermann, H. Moossen, J. Bendle, Y. Nakamura, K. Kimoto, Y. Okazaki, K. Nagashima, S. A. Gorbarenko, A. Ijiri, T. Nakatsuka, L. Menviel, M. O. Chikamoto, A. Abe-Ouchi, S. Schouten

Deep-Sea Research II Vol. 61-64 page： 93–105 2012

Assessment for paleoclimatic utility of terrestrial biomarker record in the Okhotsk Sea sediments Reviewed

Seki, O., N. Harada, M. Sato, A. Ijiri and T. Nakatsuka

Deep Sea Research II Vol. 61–64 page： 85–92 2012

Regional hydroclimate and precipitation d18O revealed in tree-ring cellulose d18O from different tree species in semi-arid Northern China Reviewed

Li, Q., T. Nakatsuka, K. Kawamura, Y. Liu and H. Song

Chemical Geology Vol. 282 page： 19-28 2011

Hydroclimate variability in the North China Plain and its link with El Nino-Southern Oscillation since 1784 A.D. Insights from tree-ring cellulose d18O Reviewed

Li, Q, T. Nakatsuka, K. Kawamura, Y. Liu, H. Song

Journal of Geophysical Research Vol. 116 2011

Tree-ring cellulose δ18O of Fokienia hodginsii in Northern Laos: a promising proxy to reconstruct ENSO? Reviewed

Xu, C., M. Sano, T. Nakatsuka

Journal of Geophysical Research Vol. 116 2011

Plant-wax hydrogen isotopic evidence for postglacial variations in delivery of precipitation in the monsoon domain of China Reviewed

Seki, O., P. A. Meyers, S. Yamamoto, K. Kawamura, T. Nakatsuka, W. Zhou, Y. Zheng

Geology Vol. 39 page： 875-878 2011

Strong vertical mixing in the Urup Strait Reviewed

Itoh, S., I. Yasuda, M. Yagi, S. Osafune, H. Kaneko, J. Nishioka, T. Nakatsuka and Y. N. Volkov

Geophysical Research Letters Vol. 38 2011

地球環境の将来予測のための古環境研究の役割―過去1000年間からの教訓― Invited

中塚　武

月刊海洋 Vol. 42 page： 133-141 2010

古環境科学の統合と地球環境の将来予測 Invited

中塚　武

月刊海洋 Vol. 42 page： 131-132 2010

Seasonal changes in relative humidity recorded by intra-ring variations in oxygen isotopic ratio of tree-ring cellulose Reviewed

Nakatsuka, T., K. Ohnishi and Y. Takahashi

"Earth, Life and Isotope", edited by N. Ohkouchi, I. Tayasu and K. Koba, Kyoto University Press, Kyoto page： 291-301 2010

Fine- and microstructure observations in the Urup Strait, Kuril Islands, during August of 2006 Reviewed

Itoh, S., I. Yasuda, T. Nakatsuka, J. Nishioka and Y. N. Volkov

Journal of Geophysical Research Vol. 115 page： C08004, doi:10.1029/ 2009JC005629 2010

Compound-specific n-alkane δ13C and δD approach for assessing source and delivery processes of terrestrial organic matter within a forested watershed in northern Japan Reviewed

Seki, O., T. Nakatsuka, H. Shibata and K. Kawamura

Geochimica et Cosmochimica Acta Vol. 74 page： 599-613 2010

Synchronized Northern Hemisphere Climate Change and Solar Magnetic Cycles during the Maunder Minimum. Reviewed

Yamaguchi, Y., Y. Yokoyama, H. Miyahara, K. Sho and T. Nakatsuka

Proceedings of the National Academy of Sciences of the United States of America Vol. 107 page： 20697–20702 2010

Stable carbon isotope ratios of ethane over the North Pacific: atmospheric measurements and global chemical transport modeling Reviewed

Saito, T., O. Stein, U. Tsunogai, K. Kawamura, T. Nakatsuka, T. Gamo and N. Yoshida

Journal of Geophysical Research Vol. 116 page： D02308 2010

Iron nutritional status of the phytoplankton assemblage in the Okhotsk Sea during summer Reviewed

Yoshimura, T., J. Nishioka and T. Nakatsuka

Deep Sea Research I Vol. 57 page： 1454-1464 2010

Phytoplankton growth and microzooplankton grazing in the Sea of Okhotsk during late summer of 2006. Reviewed

Liu, H., K. Suzuki, J. Nishioka, R. Sohrin and T. Nakatsuka

Deep-Sea Research I Vol. 56 page： 561-570 2009

Photochemical histories of non-methane hydrocarbons inferred from their stable carbon isotope ratio measurements over East Asia, Reviewed

Saito, T., K. Kawamura, U. Tsunogai, Tai-Yih Chen, H. Matsueda, T. Nakatsuka, T. Gamo, M. Uematsu and B. J. Huebert

Journal of Geophysical Research Vol. 114 page： D11303, doi:10.1029/2008JD011388 2009

Increases of alkalinity and pH in the Okhotsk Sea during the 1990s and 2000s Reviewed

Watanabe, Y. W., J. Nishioka, M. Shigemitsu, A. Mimura and T. Nakatsuka

Geophysical Research Letter Vol. 36 ( 15 ) page： doi:10.1029/2009GL038520 2009

Benthic foraminifera as trophic links between phytodetritus and benthic metazoans: carbon and nitrogen isotopic evidence. Reviewed

Nomaki, H., N. O. Ogawa, N. Ohkouchi, H. Suga, T. Toyofuku, M. Shimanaga, T. Nakatsuka, and H. Kitazato

Marine Ecology Progress Series Vol. 357 page： 153-164 2008

Processes influencing iron distributions in the coastal waters of the Tsugaru Strait, Japan. Reviewed

Saitoh, Y., K. Kuma, Y. Isoda, H. Kuroda, H. Matsuura, T. Wagawa, H. Takata, N. Kobayashi, S. Nagao and T. Nakatsuka

Journal of Oceanography Vol. 64 page： 815-830 2008

Summer relative humidity in northern Japan inferred from tree-ring d18O (1776-2002 AD)- Influence of paleoclimate indices of atmospheric circulation. Reviewed

Tsuji, H., T. Nakatsuka, K. Yamazaki and K. Takagi

Journal of Geophysical Research Vol. 113 page： D18103, doi:10.1029/2007JD009080. 2008

カムチャッカ半島のカラマツ年輪セルロースの水素・酸素同位体比による夏季気温変動の復元．

中塚　武・大西啓子・原登志彦

月刊地球 Vol. 30 page： 207-215 2008

内陸と外洋の生態系の河川・陸棚・中層を介した物質輸送による結びつき－2006/2007オホーツク海航海の作業仮説－．

中塚　武・西岡　純・白岩孝行

月刊海洋 Vol. 号外50 page： 68-76 2008

Time-series sediment trap record of alkenones from the western Sea of Okhotsk. Reviewed

Seki, O., T. Nakatsuka, K. Kawamura, S. Saitoh and M. Wakatsuchi

Marine Chemistry Vol. 104 page： 253-265 2007

*Iron supply to the western subarctic Pacific: Importance of iron export from the Sea of Okhotsk. Reviewed

Nishioka, J., T. Ono, H. Saito, T. Nakatsuka, S. Takeda, T. Yoshimura, K. Suzuki, K. Kuma, S. Nakabayashi, D. Tsumune, H. Mitsudera, W. K. Johnson, and A. Tsuda

Journal of Geophysical Research Vol. 112 page： C10012, doi:10.1029/2006JC004055 2007

Different ingestion patterns of 13C-labeled bacteria and algae by deep-sea benthic foraminifera. Reviewed

Nomaki, H., P. Heinz, T. Nakatsuka, M. Shimanaga, N. Ohkouchi, N. O. Ogawa, K. Kogure, E. Ikemoto and H. Kitazato

Marine Ecology Progress Series Vol. 310 page： 95-108 2006

Distribution of N* in the Sea of Okhotsk and its use as a biogeochemical tracer of Okhotsk Sea Intermediate Water formation process. Reviewed

Yoshikawa, C., T. Nakatsuka and M. Wakatsuchi

Journal of Marine Systems Vol. 63 page： 49-62 2006

Cycladophora davisiana (Radiolaria) in the Okhotsk Sea : a key for reconstructing glacial ocean conditions. Reviewed

Okazaki, Y., O. Seki, T. Nakatsuka, T. Sakamoto, M. Ikehara and K. Takahashi

Journal of Oceanography Vol. 62 page： 639-648 2006

Nitrate-nitrogen isotopic patterns in surface waters of the western and central equatorial Pacific. Reviewed

Yoshikawa, C., Y. Yamanaka and T. Nakatsuka

Journal of Oceanography Vol. 62 page： 511-525 2006

d18O of tree-rings cellulose in two species (spruce and oak) as proxies of precipitation amount and relative humidity in Northern Japan. Reviewed

Tsuji, H., T. Nakatsuka and K. Takagi

Chemical Geology Vol. 231 page： 67-76 2006

Fluxes, source and transport of organic matter in the western Sea of Okhotsk: stable carbon isotopic ratios of n-alkanes and total organic carbon. Reviewed

Seki, O., C. Yoshikawa, T. Nakatsuka, K. Kawamura and M. Wakatsuchi

Deep-Sea Research I Vol. 53 page： 253-270 2006

地球温暖化とアイソトープ－同位体古気候学の挑戦－． Invited

中塚　武

くらしと放射線 Vol. 19 page： 10－21 2006

樹木年輪セルロースの酸素同位体比による古気候の復元を目指して．

中塚　武

低温科学 Vol. 65 page： 49-56 2006

Species-specific ingestion of organic carbon by deep-sea benthic foraminifera and meiobenthos: In situ tracer experiments. Reviewed

Nomaki, H., P. Heinz, T. Nakatsuka, M. Shimanaga and H. Kitazato

Limnology and Oceanography Vol. 50 page： 134-146 2005

Ice-rafted debris (IRD) based sea-ice expansion events during the past 100 kyrs in the Okhotsk Sea. Reviewed

Sakamoto, T., M. Ikehara, K. Aoki, K. Iijima, N. Kimura, T. Nakatsuka and M. Wakatsuchi

Deep-Sea Research II Vol. 52 page： 2275-2301 2005

Transition of low-salinity water in the Western Pacific Warm Pool recorded in the nitrogen isotopic ratios of settling particles. Reviewed

Yoshikawa, C., T. Nakatsuka and H. Kawahata

Geophysical Research Letter Vol. 32 page： L14615, doi:10.1029/2005GL023103 2005

Shock-induced isotope evolution of hydrogen and carbon in meteorites. Reviewed

Mimura, K., M. Okamoto, T. Nakatsuka, K. Sugitani, and O. Abe

Geophysical Research Letter Vol. 32 page： L08710, doi:10.1029/2004GL022177 2005

Decreased surface salinity in the Sea of Okhotsk during the last glacial period estimated from alkenones, Reviewed

Seki, O., K. Kawamura, T. Sakamoto, M. Ikehara, T. Nakatsuka, and M. Wakatsuchi

Geophysical Research Letter Vol. 32 page： L08710, doi:10.1029/2004GL022177 2005

An ecosystem model including nitrogen isotopes: Perspectives on a study of the marine nitrogen cycle. Reviewed

Yoshikawa, C., Y. Yamanaka and T. Nakatsuka

Journal of Oceanography Vol. 61 page： 921-942 2005

*Oxygen and carbon isotopic ratios of tree-ring cellulose in a conifer-hardwood mixed forest in northern Japan. Reviewed

Nakatsuka, T., K. Ohnishi, T. Hara, A. Sumida, D. Mitsuishi, N. Kurita and S. Uemura

Geochemical Journal Vol. 38 page： 77-88 2004

In situ measurement of butane and pentane isomers over the subtropical North Pacific. Reviewed

Saito, T., K. Kawamura, T. Nakatsuka and B. J. Huebert

Geochemical Journal Vol. 38 page： 397-404 2004

*Dissolved and particulate organic carbon in the Sea of Okhotsk: Transport from continental shelf to ocean interior. Reviewed

Nakatsuka, T., M. Toda, K. Kawamura and M. Wakatsuchi

Journal of Geophysical Research Vol. 109 page： C09S14, doi:10.1029/2003JC001909. 2004

*Biogenic and lithogenic particle flux in the western region of the Sea of Okhotsk: Implications for lateral material transport and biological productivity. Reviewed

Nakatsuka, T., T. Fujimune, C. Yoshikawa, S. Noriki, K. Kawamura, Y. Fukamachi, G. Mizuta and M. Wakatsuchi

Journal of Geophysical Research Vol. 109 page： C09S13, doi:10.1029/2003JC001908 2004

Reconstruction of paleoproductivity in the Sea of Okhotsk over the last 30 kyrs. Reviewed

Seki, O., M. Ikehara, K. Kawamura, T. Nakatsuka, K. Ohnishi, M. Wakatsuchi, H. Narita and T. Sakamoto

Paleoceanography Vol. 19 page： PA1016, doi:10.1029/2002PA000808 2004

Variation of alkenone sea surface temperature in the Sea of Okhotsk over the last 85 kyrs. Reviewed

Seki, O., K. Kawamura, M. Ikehara, T. Nakatsuka and T. Oba

Organic Geochemistry Vol. 35 page： 347-354 2004

過去の生物生産と物質循環

中塚　武（2004）：

月刊地球 Vol. 号外 44 page： 117-121 2004

Sediment core profiles of long-chain n-alkanes in the Sea of Okhotsk: Enhanced transport of terrestrial materials in the last deglacial to the early Holocene. Reviewed

Seki, O., K. Kawamura, T. Nakatsuka, K. Ohnishi M. Ikehara and M. Wakatsuchi

Geophysical Research Letter Vol. 30 page： 10.1029/2001GL014464 2003

鉛210およびセシウム137から見た相模湾における沈降粒子の振る舞いと堆積フラックス． Reviewed

加藤義久・中塚　武・増澤敏行・白山義久・嶋永元裕・北里　洋

日本海水学会誌 Vol. 57 page： 150-165 2003

Radiolarians under the seasonally sea-ice covered conditions in the Okhotsk Sea: flux and their implications for paleoceanography. Reviewed

Okazaki, Y., Takahashi, K., Yoshitani, H., Nakatsuka, T., Ikehara, M., and Wakatsuchi, M.

Marine Micropaleontology Vol. 49 page： 195-230 2003

The production scheme of Cycladophora davisiana (Radiolaria) in the Okhotsk Sea and the northwestern North Pacific: implication for the paleoceanographic conditions during the glacials in the high latitude oceans. Reviewed

Okazaki, Y., K. Takahashi, T. Nakatsuka and M. C. Honda

Geophysical Research Letter Vol. 30 page： 1939 doi.10,1029/2003 GL018070. 2003

210Pb and 237Cs in sediments from Sagami Bay, Japan: Sedimentation rates and inventories. Reviewed

Kato, Y., H. Kitazato, M. Shimanaga, T. Nakatsuka, Y. Shirayama and T. Masuzawa

Progress in Oceanography Vol. 57 page： 77-95 2003

Temporal variation in mass fluxes and their major components of sinking particles in Sagami Bay off Japan. Reviewed

Masuzawa, T., Tie Li, Y. Duan, M. Yamamoto, Y. Hibi, T. Nakatsuka, H. Kitazato and Y. Kato

Progress in Oceanography Vol. 57 page： 59-75 2003

Particle dynamics in the deep water column of Sagami Bay, Japan –II: Seasonal change in profiles of suspended phytodetritus. Reviewed

Nakatsuka, T., J. Kanda and H. Kitazato

Progress in Oceanography Vol. 57 page： 47-57 2003

Particle dynamics in the deep water column of Sagami Bay, Japan- I: Origins of apparent flux of sinking particles. Reviewed

Nakatsuka, T., T. Masuzawa, J. Kanda, H. Kitazato, Y. Shirayama, M. Shimanaga and A. Yamaoka

Progress in Oceanography Vol. 57 page： 31-45 2003

Long-term monitoring of the sedimentary process at the central part of Sagami Bay, Japan: Rationale, logistics and overview of results. Reviewed

Kitazato, H., T. Nakatsuka, M. Shimanaga, J. Kanda, W. Soh, Y. Kato, Y. Okada, A. Yamaoka, T. Masuzawa, K. Suzuki, and Y. Shirayama

Progress in Oceanography Vol. 57 page： 3-16 2003

The role of benthic foraminifera in deep-sea food webs at the sediment-water interface: Results from in situ feeding experiments in Sagami bay. Reviewed

Kitazato, H., H. Nomaki, P. Heinz and T. Nakatsuka

Frontier Research on Earth Evolution Vol. 1 page： 227-232 2003

Stable carbon isotopic compositions of light hydrocarbons over the western North Pacific and implication for their photochemical ages. Reviewed

Saito, T., U. Tsunogai, K. Kawamura, T. Nakatsuka, and N. Yoshida

Journal of Geophysical Research Vol. 107 ( D4 ) page： 10.1029/2000JD000127 2002

Biogenic opal indicating less productive northwestern North Pacific during the glacial ages. Reviewed

Narita, H., M. Sato, S. Tsunogai, M. Murayama, M. Ikehara, T. Nakatsuka, and M. Wakatsuchi

Geophysical Research Letter Vol. 29 page： 10.1029/2001GL014320 2002

An extremely turbid intermediate water in the Sea of Okhotsk : Implication for the transport of particulate organic carbon in a seasonally ice-bound sea. Reviewed

Nakatsuka, T., C. Yoshikawa, M. Toda, K. Kawamura and M. Wakatsuchi

Geophysical Research Letter Vol. 29 page： 10.1029/2001GL014029 2002

A biomarker approach for assessing marine and terrigenous inputs to the sediments of Sea of Okhotsk for the last 27,000 years. Reviewed

Ternois, Y., K. Kawamura, L. Keigwin, N. Ohkouchi and T. Nakatsuka

Geochimica et Cosmochimica Acta Vol. 65 page： 791-802 2001

海溝斜面域における粒状有機物の分散・集積メカニズム –リバウンド＆スキャベンジモデル-．

中塚　武

月刊地球 Vol. 号外32 page： 90-95 2001

有能な語り手－有機物と同位体. Invited Reviewed

中塚　武

「海と環境」日本海洋学会編, 講談社サイエンティフィク page： 28-38 2001

N*による縁辺海における窒素収支解析の試み.

中塚　武

月刊海洋 Vol. 33 page： 518-522 2001

窒素同位体海洋化学の展開 – オホーツク海を例として -.

中塚　武・吉川知里・大西啓子

月刊海洋 Vol. 号外 25 page： 114-120 2001

Implication of carbon isotope ratios of C27-C33 alkanes and C37 alkenes for the sources of organic matter in the Southern Ocean surface sediments. Reviewed

Ohkouchi, N., K. Kawamura, N. Takemoto, M. Ikehara and T. Nakatsuka

Geophysical Research Letters, Vol. 27 page： 233-236 2000

北部北太平洋・ベーリング海における懸濁粒子の脂質成分・炭素安定同位体比の鉛直分布． Reviewed

河村公隆・加治　貴・大河内直彦・中塚　武・池原　実

日本プランクトン学会報 Vol. 47 page： 140-143 2000

14C budget of sinking particulate organic matter in Japan Trench: a new approach to estimate the contribution from resuspended particles in deep water column. Reviewed

Nakatsuka, T., A. Hosokawa, N. Handa, E. Matsumoto and T. Masuzawa

"Dynamics and Characterization of Marine Organic Matter" edited by N. Handa, E. Tanoue and T. Hama, TERRAPUB, Tokyo page： 169-186 2000

Seasonal phytodetritus deposition and responses of bathyal benthic foraminiferal populations in Sagami Bay, Japan: preliminary results from “Project Sagami 1996-1999". Reviewed

Kitazato, H., Y. Shirayama, T. Nakatsuka, S. Fujiwara, M. Shimanaga, Y. Kato, Y. Okada, J. Kanda, A. Yamaoka, T. Masuzawa and K. Suzuki

Marine Micropaleontology Vol. 40 page： 135-149 2000

室内実験による不飽和脂肪酸からの低分子ジカルボン酸の光化学的生成（予報）． Reviewed

松永　壮・河村公隆・中塚　武・大河内直彦

Vol. 14 page： 19-26 1999

Production and transport of long-chain alkenones and alkyl alkenoates in a sea water column in the northwestern Pacific off central Japan. Reviewed

Sawada, K., N. Handa and T. Nakatsuka

Marine Chemistry Vol. 59 page： 219-234 1998

堆積有機物の炭素・窒素安定同位体比による古海洋解析. Invited Reviewed

中塚　武

地学雑誌 Vol. 107 page： 54-68 1998

Reconstruction of seasonal variation in nutrient budget of surface mixed layer using δ15N of sinking particle collected by time-series sediment trap system. Reviewed

Nakatsuka,T. and N.Handa

Journal of Oceanography Vol. 53 page： 105-116 1997

海洋堆積物の窒素同位体比に関する研究 -窒素同位体比による海洋表層環境の復元-. Invited Reviewed

中塚　武

海の研究 Vol. 6 page： 383-397 1997

Origin and decomposition of sinking particulate organic matter in the deep water column inferred from the vertical distributions ofδ15N, δ13C and δ14C. Reviewed

Nakatsuka,T., N.Handa, N.Harada, T.Sugimoto and S.Imaizumi

Deep-Sea Research I Vol. 44 page： 1957-1979 1997

Fresh water seepage and pore water recycling on the seafloor: Sagami Trough subduction zone, Japan. Reviewed

Tsunogai,U., J.Ishibashi, H.Wakita, T.Gamo, T.Masuzawa, T.Nakatsuka, Y.Nojiri, and T.Nakamura

Earth and Planetary Science Letter Vol. 138 page： 157-168 1996

有機物の炭素・窒素安定同位体比－その外洋表層環境の復元の論理.

中塚　武

月刊海洋 Vol. 号外11 page： 148-154 1996

Glacial-interglacial migration of an upwelling field in the western equatorial Pacific recorded by sediment 15N/14N. Reviewed

Vol. 22 page： 2525-2528 1995

海洋深層における粒子状有機炭素の起源と輸送－炭素同位体組成（14C/12C, 13C/12C）からの評価－.

中塚　武

月刊海洋 Vol. 号外 8 page： 121-126 1995

AMS 14C measurements of dissolved inorganic carbon in pore waters from a deep-sea "cold seep" giant clam community off Hatsushima Island, Sagami Bay, Japan. Reviewed

Masuzawa,T., H.Kitagawa, T.Nakatsuka, N.Handa, and T.Nakamura

Radiocarbon Vol. 37 page： 617-627 1995

Glacial to interglacial surface nutrient variations of Bering deep basins recorded by δ13C and δ15N of sedimentary organic matter. Reviewed

Nakatsuka,T., K.Watanabe, N.Handa, E.Matsumoto, and E.Wada

Paleoceanography Vol. 10 page： 1047-1061 1995

Geochemistry of pore waters from a bathyal Calyptogena community off Hatsushima Island, Sagami Bay, Japan. Reviewed

Masuzawa,T., T.Nakatsuka and N.Handa

"Biogeochemical Processes and Ocean Flux in the Western Pacific" edited by H.Sakai and Y.Nozaki, TERRAPUB, Tokyo. page： 407-421 1995

Spatial and temporal variation of δ15N in sinking particles in deep waters: its implication for the origin and transport of particulate organic matter. Reviewed

Nakatsuka,T., N.Handa and S.Imaizumi

"Biogeochemical Processes and Ocean Flux in the Western Pacific" edited by H.Sakai and Y.Nozaki, TERRAPUB, Tokyo, page： 355-374 1995

堆積物窒素同位体比による西赤道太平洋における湧昇・海流系変動の復元.

中塚　武・原田尚美・松本英二

月刊海洋 Vol. 27 page： 483-487 1995

Vertical fluxes of organic materials in the Northern North West Pacific and Breid Bay, Antarctica, with special reference in the effect of phytoplankton bloom. Reviewed

"Deep Ocean Circulation, Physical and Chemical Aspects" edited by T.Teramoto, Elsevier, Amsterdam page： 221-233 1993

海のプランクトンとマリンスノー

中塚　武

遺伝 Vol. 47 page： 15-20 1993

古海洋の生物生産環境の記録としての有機物の窒素同位体比.

中塚　武

月刊地球, Vol. 号外 8 page： 65-69 1993

*The dynamic changes of stable isotopic ratios of carbon and nitrogen in suspended and sedimented particulate organic matter during a plankton bloom. Reviewed

Nakatsuka,T., N.Handa, E.Wada and C-S.Wong

Journal of Marine Research Vol. 50 page： 267-296 1992

Vertical Fluxes and ecological significance of organic materials during the phytoplankton bloom during austral summer in Breid Bay, Antarctica. Reviewed

Vol. 112 page： 469-478 1992

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