Faculty Profiles - FUJITA, Koji

Papers - FUJITA, Koji

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Determination of amino acids in ice samples. Reviewed

Nakazawa F, Ohta K, Harada N, Fujita K, Nakawo M

Bulletin of Glaciological Research Vol. 22 page： 69-74 2005

Mass balance of the Qiyi Glacier in the Qilian Mountains: a new observation. Reviewed

Pu J, Yao T, Duan K, Fujita K, Sakai A, Matsuda Y

Journal of Glaciology and Geocryology Vol. 27 ( 2 ) page： 199-204 2005

A large amount of biogenic surface dust (cryoconite) on a glacier in the Qilian Mountains, China. Reviewed

Takeuchi N, Matsuda Y, Sakai A, Fujita K

Bulletin of Glaciological Research Vol. 22 page： 1-8 2005

名古屋大学地球水循環研究センターにおける水安定同位体組成分析の現状. Reviewed

地球水循環研究センター水同位体分析システム運営委員会（阿部理, 池田健一, 大田啓一, 栗田直幸, 坂井亜規子, 中尾正義, 中村健治, 檜山哲哉, 藤田耕史, 三野義尚, 三宅隆之, 李在鎔）

水文・水資源学会誌 Vol. 18 ( 5 ) page： 531-538 2005

南極ドームふじ観測拠点での深掘削上の建設-第44次ドームふじ越冬隊による作業-. Reviewed

亀田貴雄, 大日方一夫, 高橋暁, 谷口健治, 杉田興正, 藤田耕史, 栗崎高士, 中野啓

南極資料 Vol. 49 ( 2 ) page： 207-243 2005

Language：Japanese

第44次南極地域観測隊ドームふじ越冬隊は2003年1月19日から2004年1月25日までドームふじ観測拠点(南緯77°19′01″,東経39°42′11″; 標高3810 m)に滞在し,雪氷・気象・宙空の観測を実施する一方,新掘削場の建設作業を実施した.この建設作業は43次隊による新掘削場の外装工事を主体した建設作業を引き継ぎ,新掘削場の内装工事を主とした.本稿では深層掘削準備作業として現地にて実施した以下の作業を記述した.ケーシングパイプ引き上げ,掘削孔拡幅,ケーシングパイプ挿入,ウインチ移設(移設用スロープの造成および10 mピット内の整備),床造成,マスト起倒用10 mピットの造成および10 mピット内の整備,ドリル作業室西側の階段造作および旧掘削場の深層ウインチ跡の床張り,机の製作,マストおよび小型門型クレーンの設置,リフター設置,ウインチ稼働テスト,チップ回収機吊り下げ用ウインチの設置,深層ウインチのケーブル巻き換え,深層ドリルの組み立ておよびマスト調整,コア貯蔵用雪洞の拡幅,コア棚の設置および一般設備工事.これらの作業に要した時間は合計で593.5日・人であり,1日平均6時間の作業時間だったので3561時・人となった.また,越冬中に実施した旧掘削場での検層準備および45次ドーム航空隊を主体とした深層掘削作業についても簡潔に記述した.

Stable isotope time series and precipitation origin from firn cores and snow samples, Altai glacier, Siberia. Reviewed

Aizen VB, Aizen EM, Fujita K, Kreutz K, Takeuchi N

Journal of Glaciology Vol. 51 ( 175 ) page： 637-654 2005

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

In the summers of 2001 and 2002, glacio-climatological research was performed at 4110-4120 m a.s.l. on the Belukha snow/firn plateau, Siberian Altai. Hundreds of samples from snow pits and a 21 m snow/firn core were collected to establish the annual/seasonal/monthly depth-accumulation scale, based on stable-isotope records, stratigraphic analyses and meteorological and synoptic data. The fluctuations of water stable-isotope records show well-preserved seasonal variations. The δ18O and δD relationships in precipitation, snow pits and the snow/firn core have the same slope to the covariance as that of the global meteoric water line. The origins of precipitation nourishing the Belukha plateau were determined based on clustering analysis of δ18O and d-excess records and examination of synoptic atmospheric patterns. Calibration and validation of the developed clusters occurred at event and monthly timescales with about 15% uncertainty. Two distinct moisture sources were shown: oceanic sources with d-excess <12‰, and the Aral-Caspian closed drainage basin sources with d-excess >12‰. Two-thirds of the annual accumulation was from oceanic precipitation, of which more than half had isotopic ratios corresponding to moisture evaporated over the Atlantic Ocean. Precipitation from the Arctic/Pacific Ocean had the lowest deuterium excess, contributing one-tenth to annual accumulation.

http://www.ingentaconnect.com/content/igsoc/jog/2005/00000051/00000175/art00013

Dating of seasonal snow/firn accumulation layers using pollen analysis. Reviewed

Nakazawa F, Fujita K, Takeuchi N, Fujiki T, Uetake J, Aizen V, Nakawo M

Journal of Glaciology Vol. 51 ( 174 ) page： 483-490 2005

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

Reliable chronologies in ice cores and snow pits from many alpine glaciers in latitudes between 60° N and 60° S are often difficult to establish owing to problems with annual-layer counting. Problems arise from melting, wind erosion and the negligible amount of precipitation in some seasons, all of which tend to obscure the seasonal variations in δ18O and chemical concentrations that are typically used to date ice cores. However, alpine glaciers contain many species of pollen grains that peak at particular times of the year. We used the peaks in Betulaceae, Pinus, Artemisia and a combination of Abies and Picea pollen species to determine the four seasonal layers of a snow pit on Belukha glacier in Russia's Altai Mountains. Comparing the pollen-dated profiles with wind and precipitation records allows us to determine where a seasonal layer is missing. Thus, the pollen-dating method described here may be a useful tool to measure the annual snow deposition on alpine glaciers, even when some seasonal layers are eroded by wind or missing due to negligible precipitation.

http://www.ingentaconnect.com/content/igsoc/jog/2005/00000051/00000174/art00016

Application of pollen analysis to dating of ice cores from lower-latitude glaciers. Reviewed

Nakazawa F, Fujita K, Uetake J, Kohno M, Fujiki T, Arkhipov SM, Kameda T, Suzuki K, Fujii T

Journal of Geophysical Research - Earth Surface Vol. 109 ( F4 ) page： F04001 2004

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

Ice cores from temperate regions have long been expected to be useful for understanding local climate trends, but a reliable dating method has proved difficult. Here we show that measurements of pollen using samples with only 10 mL of water can give an accurate measure of the annual ice accumulation. In addition, two major types of pollen allow us to estimate the summer ice accumulation as well as the annual accumulation.

http://www.agu.org/pubs/crossref/2004/2004JF000125.shtml

Evaporation and percolation effect on melting at debris-covered Lirung Glacier, Nepal Himalayas, 1996. Reviewed

Sakai A, Fujita K, Kubota J

Bulletin of Glaciological Research Vol. 21 page： 9-15 2004

中国甘粛省および内蒙古自治区における内陸河川の水質特性. Reviewed

秋山知宏, 藤田耕史, 中尾正義, 阿部豊, 辻村真貴

水文・水資源学会誌 Vol. 17 ( 1 ) page： 61-68 2004

Glaciological observations on the plateau of Belukha Glacier in the Altai Mountains, Russia from 2001 to 2003. Reviewed

Fujita K, Takeuchi N, Aizen V, Nikitin S

Bulletin of Glaciological Research Vol. 21 page： 57-64 2004

Chemical characteristics in a 22-m ice core at Belukha Glacier, Russia. Reviewed

Iizuka Y, Fujita K, Matoba M, Fujii Y, Matsuki K, Kohno M, Aizen V

Polar Meteorology and Glaciology Vol. 18 page： 114-120 2004

Glaciological observations on July 1st glacier in Qilian Mountains of west China during summer 2002. Reviewed

Matsuda Y, Sakai A, Fujita K, Nakawo M, Duan KQ, Pu J, Yao T

Bulletin of Glaciological Research Vol. 21 page： 31-36 2004

チベット高原における寒冷氷河からの流出特性と気候変動に対する応答予測. Reviewed

藤田耕史, 太田岳史, 上田豊

水文・水資源学会誌 Vol. 16 ( 2 ) page： 152-161 2003

Positive degree-day factors for ice ablation on four glaciers in the Nepalese Himalayas and Qinghai-Tibetan Plateau. Reviewed

Kayastha RB, Ageta Y, Nakawo M, Fujita K, Sakai A, Matsuda Y

Bulletin of Glaciological Research Vol. 20 page： 7-14 2003

Volume change of Imja Glacial Lake in the Nepal Himalayas. Reviewed

Sakai A, Fujita K, Yamada T

Disaster Mitigation and Water Management page： 556-561 2003

Impact of dust on glacier mass balance of the Tibetan Plateau. Reviewed

Fujita K

Journal of Arid Land Studies Vol. 11 ( 4 ) page： 355-360 2002

Ice core drilling on the southern slope of Nepal Himalayas. Reviewed

Fujita K, Nakazawa F, Takeuchi N, Nakawo M, Rana B, Azuma N, Fujii Y

Memoirs of National Institute of Polar Research Special Issue Vol. 56 page： 59-66 2002

The impact of aeolian dust on climate: Sino-Japanese cooperative project ADEC. Reviewed

Mikami M, Abe O, Du M, Chiba M, Fujita K, Hayashi M, Iwasaka Y, Kai K, Masuda K, Nagai T, Oomoto T, Suzuki J, Uchiyama A, Yabuki S, Yamada Y, Yasui M, Shi G, Zhang X, Shen Z, Wei W, Zhou J

Journal of Arid Land Studies Vol. 11 ( 4 ) page： 211-222 2002

Surface lowering over the ablation area of Lirung Glacier, Nepal Himalayas. Reviewed

Naito N, Kadota T, Fujita K, Sakai A, Nakawo M

Bulletin of Glaciological Research Vol. 19 page： 41-46 2002

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