研究者詳細 - 小谷　亜由美

論文 - 小谷　亜由美

分割表示 92 件中 21 - 40 件目／全件表示 >>

Dynamic Mapping of Subarctic Surface Water by Fusion of Microwave and Optical Satellite Data Using Conditional Adversarial Networks

Mizuochi Hiroki, Iijima Yoshihiro, Nagano Hirohiko, Kotani Ayumi, Hiyama Tetsuya

REMOTE SENSING 13 巻 ( 2 ) 頁： 1 - 19 2021年1月

Author Correction: The FLUXNET2015 dataset and the ONEFlux processing pipeline for eddy covariance data (Scientific Data, (2020), 7, 1, (225), 10.1038/s41597-020-0534-3)

Pastorello G.

Scientific Data 8 巻 ( 1 ) 2021年

Seasonal variations in carbon dioxide exchange fluxes at a taiga–tundra boundary ecosystem in Northeastern Siberia

Shunsuke Tei, Tomoki Morozumi, Ayumi Kotani, Shinya Takano, Atsuko Sugimoto, Shin Miyazaki, Ryo Shingubara, Rong Fan, Roman Petrov, Egor Starostin, Ruslan Shakhmatov, Aleksandr Nogovitcyn, Trofim Maximov

Polar Science 2021年

Lessons learned from more than a decade of greenhouse gas flux measurements at boreal forests in eastern Siberia and interior Alaska

Hiyama T.

Polar Science 2021年

Detection of year-to-year spring and autumn bio-meteorological variations in siberian ecosystems

Nagai Shin, Kotani Ayumi, Morozumi Tomoki, Kononov Alexander V, Petrov Roman E, Shakhmatov Ruslan, Ohta Takeshi, Sugimoto Atsuko, Maximov Trofim C, Suzuki Rikie, Tei Shunsuke

POLAR SCIENCE 25 巻 2020年9月

Direct measurement of leaf area index in a deciduous needle-leaf forest, eastern Siberia

Shin Nagai, Kotani Ayumi, Sato Tomonori, Sugimoto Atsuko, Maximov Trofim C, Nogovitcyn Aleksandr, Miyamoto Yumiko, Kobayashi Hideki, Tei Shunsuke

POLAR SCIENCE 25 巻 2020年9月

The FLUXNET2015 dataset and the ONEFlux processing pipeline for eddy covariance data

Pastorello G.

Scientific data 7 巻 ( 1 ) 2020年7月

Assessment of drought condition using remotely sensed drought severity index and its correlations with soil moisture product in Inner Mongolia

Wang L.

Theoretical and Applied Climatology 141 巻 ( 1-2 ) 頁： 715 - 728 2020年7月

Application of an open-path eddy covariance methane flux measurement system to a larch forest in eastern Siberia

Nakai T.

Agricultural and Forest Meteorology 282-283 巻 2020年3月

Application of Improved Remotely Sensed Drought Severity Index Based on Soil Moisture Product in Inner Mongolia

Wang Lusha, Kotani Ayumi, Tanaka Takafumi, Ohta Takeshi

SOLA 16 巻 ( 0 ) 頁： 259 - 264 2020年

掲載種別：研究論文（学術雑誌）出版者・発行元：公益社団法人日本気象学会

<p>Based on the drought severity index (DSI), which is derived from the ratio of evapotranspiration (ET) to potential evapotranspiration (PET) and normalized difference vegetation index (NDVI), as measured by remote sensing, we replaced the ET/PET ratio with soil moisture (0-10 cm) to establish an improved index (IDSI) and evaluated the drought situation in Inner Mongolia. The two components in IDSI are independently derived; however, the effects of evapotranspiration are contained in the soil moisture, and even precipitation changes could be reflected. We used monthly IDSI data for Inner Mongolia to evaluate drought throughout the growing season (May–September) during 2001-2010. The IDSI showed that 2001, 2007, and 2009 were years with significant drought. Areas that experienced extreme drought were less extensive than those found by the DSI because we removed the ET/PET component, which already contains the effects of the NDVI. IDSI results not only contained the degree of precipitation change for a given month through soil moisture, but also reflected the influence of water and heat in the previous month through the NDVI. Moreover, IDSI results were generally consistent with agricultural drought disaster records.</p>

DOI： 10.2151/sola.2020-043

Web of Science

Scopus

Effects of extreme drought and wet events for tree mortality: Insights from tree-ring width and carbon isotope ratio in a Siberian larch forest

Tei S.

Ecohydrology 12 巻 ( 8 ) 2019年12月

Strong and stable relationships between tree-ring parameters and forest-level carbon fluxes in a Siberian larch forest

Tei S.

Polar Science 21 巻頁： 146 - 157 2019年9月

Impact of unusually wet permafrost soil on understory vegetation and CO2 exchange in a larch forest in eastern Siberia 査読有り

Kotani Ayumi, Saito Atsushi, Kononov Alexander V, Petrov Roman E, Maximov Trofim C, Iijima Yoshihiro, Ohta Takeshi

AGRICULTURAL AND FOREST METEOROLOGY 265 巻頁： 295 - 309 2019年2月

北極陸域モデル相互比較GTMIPの熱・水収支解析査読有り

斉藤和之, 森淳子, 町屋広和, 宮崎真, 伊勢武史, 末吉哲雄, 山崎剛, 飯島慈裕, 伊川浩樹, 市井和仁, 伊藤昭彦, 大石龍太, 太田岳史, 堅田元喜, 小谷亜由美, 佐々井崇博, 佐藤篤司, 佐藤永, 杉本敦子, 鈴木力英, 田中克典, 新田友子, 庭野匡思, Burke Eleanor, 朴昊澤, 山口悟

雪氷 80 巻 ( 2 ) 頁： 159 - 174 2018年

記述言語：日本語掲載種別：研究論文（学術雑誌）出版者・発行元：公益社団法人日本雪氷学会

北極陸域モデル相互比較（GTMIP）は観測-モデル研究連携の構築，現行の陸域過程モデルの不確実性把握，次世代モデル構築のための課題抽出を目的とし，物理系から生態系にまたがる国内外の21モデルと6観測サイトが参加して行われた．評価項目は熱・水収支，積雪・凍土，炭素循環にわたるが，本稿では4サイト（フェアバンクス，ケヴォ，ティクシ，ヤクーツク）の観測値をもとに構築した共通駆動データを使用した34年間（1980-2013）の比較（stage 1）での熱・水収支について，その結果を報告する．
大気との熱・水収支に関して，物理系と生態系モデルの間では系統的な差異は見られず，個々のモデルの特徴のほうが大きかった．サイト間でも挙動の違いがあるものの，モデルの種類や複雑さとは必ずしも連動せず，背景（植生や凍土状況）に起因する違いのほうが大きかった．全体的に，モデル中央値は観測値をよく代表する推定値であったが，特に地下部との熱・水収支に関わる積雪や土壌水分・地温については，既定値設定や実装過程の有無によるモデル性能の差異もしくは系統的誤差が生じており，今後のモデル改良・高度化における重要性が示唆された．

DOI： 10.5331/seppyo.80.2_159

CiNii Research

Reconciliation of top-down and bottom-up CO2 fluxes in Siberian larch forest

Takata Kumiko, Patra Prabir K., Kotani Ayumi, Mori Junko, Belikov Dmitry, Ichii Kazuhito, Saeki Tazu, Ohta Takeshi, Saito Kazuyuki, Ueyama Masahito, Ito Akihiko, Maksyutov Shamil, Miyazaki Shin, Burke Eleanor J., Ganshin Alexander, Iijima Yoshihiro, Ise Takeshi, Machiya Hirokazu, Maximov Trofim C., Niwa Yosuke, O'ishi Ryo'ta, Park Hotaek, Sasai Takahiro, Sato Hisashi, Tei Shunsuke, Zhuravlev Ruslan, Machida Toshinobu, Sugimoto Atsuko, Aoki Shuji

ENVIRONMENTAL RESEARCH LETTERS 12 巻 ( 12 ) 2017年12月

New data-driven estimation of terrestrial CO2 fluxes in Asia using a standardized database of eddy covariance measurements, remote sensing data, and support vector regression

Ichii Kazuhito, Ueyama Masahito, Kondo Masayuki, Saigusa Nobuko, Kim Joon, Carmelita Alberto Ma., Ardoe Jonas, Euskirchen Eugenie S., Kang Minseok, Hirano Takashi, Joiner Joanna, Kobayashi Hideki, Marchesini Luca Belelli, Merbold Lutz, Miyata Akira, Saitoh Taku M., Takagi Kentaro, Varlagin Andrej, Bret-Harte M. Syndonia, Kitamura Kenzo, Kosugi Yoshiko, Kotani Ayumi, Kumar Kireet, Li Sheng-Gong, Machimura Takashi, Matsuura Yojiro, Mizoguchi Yasuko, Ohta Takeshi, Mukherjee Sandipan, Yanagi Yuji, Yasuda Yukio, Zhang Yiping, Zhao Fenghua

JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES 122 巻 ( 4 ) 頁： 767 - 795 2017年4月

Analysing the origin of rain- and subsurface water in seasonal wetlands of north-central Namibia

Hiyama Tetsuya, Kanamori Hironari, Kambatuku Jack R., Kotani Ayumi, Asai Kazuyoshi, Mizuochi Hiroki, Fujioka Yuichiro, Iijima Morio

ENVIRONMENTAL RESEARCH LETTERS 12 巻 ( 3 ) 2017年3月

Impact of rice cultivation on evapotranspiration in small seasonal wetlands of north-central Namibia

Kotani Ayumi, Hiyama Tetsuya, Ohta Takeshi, Hanamura Miho, Kambatuku Jack R., Awala Simon K., Iijima Morio

HYDROLOGICAL RESEARCH LETTERS 11 巻 ( 2 ) 頁： 134 - 140 2017年

記述言語：日本語掲載種別：研究論文（学術雑誌）出版者・発行元：水文・水資源学会／日本地下水学会／日本水文科学会／陸水物理研究会

<p>This paper aims to evaluate the effect of mixed-cropping of rice and upland crops on evapotranspiration (ET) in a small seasonal wetland in the north-central Namibia. Meteorological observations were conducted in the experimental sloped field, which simulated the cultivation of both rice in a wetland environment and upland crops in the surrounding rain-fed area, and included a reference wetland with natural vegetation. During cultivation, ET from the rice field was similar to that from the wetland. However, during the dry period ET was remarkably reduced in the post-harvest field, while continuous ET occurred in the natural wetland even after surface water had dried up. The response of surface conductance to meteorological variables was investigated by means of the Jarvis–Stewart conductance model. During cultivation, surface conductance of the rice field and the wetland had a distinct stress response compared with that of the rain–fed crop field. During the dry period, surface conductance of the wetland site, in which the surface water dried–up, still responded to the meteorological conditions in contrast to those of the post-harvest field with plowed bare soil.</p>

DOI： 10.3178/hrl.11.134

Web of Science

Scopus

CiNii Research

Factors contributing to soil nitrogen mineralization and nitrification rates of forest soils in the Japanese archipelago

Urakawa Rieko, Ohte Nobuhito, Shibata Hideaki, Isobe Kazuo, Tateno Ryunosuke, Oda Tomoki, Hishi Takuo, Fukushima Keitaro, Inagaki Yoshiyuki, Hirai Keizo, Oyanagi Nobuhiro, Nakata Makoto, Toda Hiroto, Kenta Tanaka, Kuroiwa Megumi, Watanabe Tsunehiro, Fukuzawa Karibu, Tokuchi Naoko, Ugawa Shin, Enoki Tsutomu, Nakanishi Asami, Saigusa Nobuko, Yamao Yukio, Kotani Ayumi

FOREST ECOLOGY AND MANAGEMENT 361 巻頁： 382 - 396 2016年2月

Persistence and memory timescales in root-zone soil moisture dynamics

Ghannam Khaled, Nakai Taro, Paschalis Athanasios, Oishi Christopher A., Kotani Ayumi, Igarashi Yasunori, Kumagai Tomo'omi, Katul Gabriel G.

WATER RESOURCES RESEARCH 52 巻 ( 2 ) 頁： 1427 - 1445 2016年2月

　前のページ - 次のページ　

<小谷 亜由美>

論文 - 小谷 亜由美

<小谷　亜由美>

論文 - 小谷　亜由美