研究者詳細 - 藤田　耕史

論文 - 藤田　耕史

分割表示 211 件中 161 - 180 件目／全件表示 >>

Mass balance of the Qiyi Glacier in the Qilian Mountains: a new observation. 査読有り

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

Journal of Glaciology and Geocryology 27 巻 ( 2 ) 頁： 199-204 2005年

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

Takeuchi N, Matsuda Y, Sakai A, Fujita K

Bulletin of Glaciological Research 22 巻頁： 1-8 2005年

Dating of seasonal snow/firn accumulation layers using pollen analysis. 査読有り

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

Journal of Glaciology 51 巻 ( 174 ) 頁： 483-490 2005年

記述言語：英語掲載種別：研究論文（学術雑誌）

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

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

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

Journal of Glaciology 51 巻 ( 175 ) 頁： 637-654 2005年

記述言語：英語掲載種別：研究論文（学術雑誌）

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

Application of pollen analysis to dating of ice cores from lower-latitude glaciers. 査読有り

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

Journal of Geophysical Research - Earth Surface 109 巻 ( F4 ) 頁： F04001 2004年

記述言語：英語掲載種別：研究論文（学術雑誌）

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. 査読有り

Sakai A, Fujita K, Kubota J

Bulletin of Glaciological Research 21 巻頁： 9-15 2004年

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. 査読有り

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 17 巻 ( 1 ) 頁： 61-68 2004年

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

Fujita K, Takeuchi N, Aizen V, Nikitin S

Bulletin of Glaciological Research 21 巻頁： 57-64 2004年

Chemical characteristics in a 22-m ice core at Belukha Glacier, Russia. 査読有り

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

Polar Meteorology and Glaciology 18 巻頁： 114-120 2004年

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

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

Bulletin of Glaciological Research 21 巻頁： 31-36 2004年

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. 査読有り

藤田耕史, 太田岳史, 上田豊

水文・水資源学会誌 16 巻 ( 2 ) 頁： 152-161 2003年

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

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

Bulletin of Glaciological Research 20 巻頁： 7-14 2003年

Volume change of Imja Glacial Lake in the Nepal Himalayas. 査読有り

Sakai A, Fujita K, Yamada T

Disaster Mitigation and Water Management 頁： 556-561 2003年

Distribution characteristics and energy balance of ice cliffs on debri-covered glaciers, Nepal Himalaya. 査読有り

Sakai A, Nakawo M, Fujita K

Arctic, Antarctic and Alpine Research 34 巻 ( 1 ) 頁： 12-19 2002年

Impact of dust on glacier mass balance of the Tibetan Plateau. 査読有り

Fujita K

Journal of Arid Land Studies 11 巻 ( 4 ) 頁： 355-360 2002年

Ice core drilling on the southern slope of Nepal Himalayas. 査読有り

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

Memoirs of National Institute of Polar Research Special Issue 56 巻頁： 59-66 2002年

The impact of aeolian dust on climate: Sino-Japanese cooperative project ADEC. 査読有り

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 11 巻 ( 4 ) 頁： 211-222 2002年

Surface lowering over the ablation area of Lirung Glacier, Nepal Himalayas. 査読有り

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

Bulletin of Glaciological Research 19 巻頁： 41-46 2002年

Shrinkage of Glacier AX010 in Shorong region, Nepal Himalayas in the 1990s. 査読有り

Fujita K, Kadota T, Rana B, Kayastha RB, Ageta Y

Bulletin of Glaciological Research 18 巻頁： 51-54 2001年

Glaciological observations on Rikha Samba Glacier in Hidden Valley, Nepal Himalayas, 1998 and 1999. 査読有り

Fujita K, Nakazawa F, Rana B

Bulletin of Glaciological Research 18 巻頁： 31-35 2001年

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