研究者詳細 - 藤田　耕史

論文 - 藤田　耕史

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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

Variation of precipitation d18O in Langtang Valley, Himalayas. 査読有り

Zhang X, Nakawo M, Fujita K, Yao T, Han J

Science in China D44 巻 ( 9 ) 頁： 769-778 2001年

Study project on the recent rapid shrinkage of summer-accumulation type glaciers in the Himalayas, 1997-1999. 査読有り

Ageta Y, Naito N, Nakawo M, Fujita K, Shankar K, Pokhrel AP, Wangda D

Bulletin of Glaciological Research 18 巻頁： 45-49 2001年

Mass balance of Xiao Dongkemadi Glacier on the central Tibetan Plateau from 1989 to 1995. 査読有り

Fujita K, Ageta Y, Pu J, Yao T

Annals of Glaciology 31 巻頁： 159-163 2000年

担当区分：筆頭著者記述言語：英語掲載種別：研究論文（学術雑誌）

Data on the mass balance of Xiao Dongkemadi glacier in the Tanggula mountains, central Tibetan Plateau, were obtained over 5.5 years from 1989 to1995. These are the first continuous mass-balance data for a continental-type glacier on the Tibetan Plateau, where the glacier accumulates during the summer monsoon (summer-accumulation-type glacier). Mass-balance vs altitude profiles were steeper in the negative than in the positive mass-balance years. This is considered to have resulted from the effect of summer accumulation. The annual mass balance is compared with air temperature, precipitation, and black-body temperature in the area including the glacier, which is calculated from infrared radiation observations by the Japanese Geostationary Meteorological Satellite. It was found that the interannual variation in the glacier mass balance was not closely related to maximum monthly mean air temperature, while it did have a relatively good correlation with maximum monthly mean black-body temperature.

http://www.ingentaconnect.com/content/igsoc/agl/2000/00000031/00000001/art00026

Effect of summer accumulation on glacier mass balance on the Tibetan Plateau revealed by mass-balance model. 査読有り

Fujita K, Ageta Y

Journal of Glaciology 46 巻 ( 153 ) 頁： 244-252 2000年

担当区分：筆頭著者記述言語：英語掲載種別：研究論文（学術雑誌）

The characteristics and sensitivities of a cold-based glacier on the Tibetan Plateau, where the summer monsoon provides most of the mass input to glaciers, are discussed using an energy-balance model incorporating the process of water refreezing. The model accurately represents the observational results related to the mass balance of Xiao Dongkemadi glacier on the central plateau during 1992/93. Our data revealed that the mass balance of cold glaciers cannot simply be described by the surface mass/heat balances, because about 20% of infiltrated water is refrozen and thus does not run off from the glacier. Model calculations demonstrate that glaciers in an arid environment can maintain their mass since the monsoon provides precipitation during the melting season. Snowfall in summer keeps surface albedo high and largely restrains ablation. Nevertheless, the calculations also make clear that glaciers on the plateau are more vulnerable than those of other regions because of summer accumulation. In the monsoon climate, warming would cause not only a decrease in accumulation, but also a drastic increase in ablation in combination with surface-albedo lowering. Therefore, although glaciers on and around the plateau can be sustained by summer accumulation, they are more vulnerable to warming than winter-accumulation-type glaciers.

http://www.ingentaconnect.com/content/igsoc/jog/2000/00000046/00000153/art00009

Himalayan ice core dating with snow algae. 査読有り

Yoshimura Y, Kohshima S, Takeuchi N, Seko K, Fujita K

Journal of Glaciology 46 巻 ( 153 ) 頁： 335-340 2000年

記述言語：英語掲載種別：研究論文（学術雑誌）

Snow algae in shallow ice cores (7 m long) from Yala Glacier in the Langtang region of Nepal were examined for potential use in ice-core dating. Ice-core samples taken at 5350 m a.s.l. in 1994 contained more than seven species of snow algae. In a vertical profile of the algal biomass, 11 distinct algal layers were observed. Seasonal observation in 1996 at the coring site indicated most algal growth occurred from late spring to late summer. Pit observation in 1991, 1992 and 1994 indicated that algal layer formation takes place annually. δ18O, chemical ions (Na+, Cl-, SO42- and NO3-) and microparticles failed to show any clear seasonal variation, particularly at depths exceeding 2 m, possibly due to heavy meltwater percolation. Snow algae in ice cores would thus appear to be accurate boundary markers of annual layers and should prove useful for ice-core dating in Himalayan-type glaciers.

http://www.ingentaconnect.com/content/igsoc/jog/2000/00000046/00000153/art00017

Seasonal changes in dissolved chemical composition and flux of meltwater draining from Lirung Glacier in the Nepal Himalayas. 査読有り

Bhatt MP, Masuzawa T, Yamamoto M, Sakai A, Fujita K

International Association of Hydrological Sciences, (Symposium at Seattle 2000 - Debris-covered glacier) 264 巻頁： 277-288 2000年

New eyes in the sky measure glaciers and ice sheets. 査読有り

Kieffer H, Kargel JS, Barry R, Bindschadler R, Bishop M, Mckinnon D, Ohmura A, Raup B, Antoninetti M, Bamber J, Braun M, Brown I, Cohen D, Copland L, DueHagen J, Engeset RV, Fitzharris B, Fujita K, Haeberli W, Hagen JO, Hall D, Hoelzle M, Johansson M, Kääb A, Koenig M, Konobalov V, Maisch M, Paul F, Rau F, Reeh N, Rignot E, Rivera A, Wildt MR, Scambos T, Schaper J, Scharfen G, Shroder J, Solomina O, Thompson D, van der Veen K, Wohlleben T, Young N

Eos, Transactions American Geophysical Union 81 巻 ( 24 ) 頁： 265, 270-271 2000年

Air temperature environment on the debris-covered area of Lirung Glacier, Langtang Valley, Nepal Himalayas. 査読有り

Fujita K, Sakai A

International Association of Hydrological Sciences, (Symposium at Seattle 2000 - Debris-covered glacier) 264 巻頁： 83-88 2000年

Role of supraglacial ponds in the ablation process of a debris-covered glacier in the Nepal Himalayas. 査読有り

Sakai A, Takeuchi N, Fujita K, Nakawo M

International Association of Hydrological Sciences, (Symposium at Seattle 2000 - Debris-covered glacier) 264 巻頁： 119-130 2000年

Characteristics of cryoconite holes on a Himalayan glacier, Yala Glacier Central Nepal. 査読有り

Takeuchi N, Kohshima S, Yoshimura Y, Seko K, Fujita K

Bulletin of Glaciological Research 17 巻頁： 51-59 2000年

チベット高原の寒冷氷河における上積氷の研究. 査読有り

藤田耕史

雪氷 60 巻 ( 5 ) 頁： 379-385 1998年

Melt rate of ice cliffs on the Lirung Glacier, Nepal Himalayas, 1996. 査読有り

Sakai A, Nakawo M, Fujita

Bulletin of Glacier Research 16 巻頁： 57-66 1998年

Snow algae community on a Himalayan glacier, Glacier AX010 East Nepal : Relationship with glacier summer mass balance. 査読有り

Takeuchi N, Kohshima S, Fujita K

Bulletin of Glacier Research 16 巻頁： 43-50 1998年

Surface flow of the ablation area of the Lirung Glacier in Langtang Valley, Nepal Himalayas. 査読有り

aito N, Nakawo M, Aoki T, Asahi K, Fujita K, Sakai A, Kadota T, Shiraiwa T, Seko K

Bulletin of Glacier Research 16 巻頁： 67-73 1998年

Glaciological observations of Yala Glacier in Langtang Valley, Nepal Himalayas, 1994 and 1996. 査読有り

Fujita K, Takeuchi N, Seko K

Bulletin of Glacier Research 16 巻頁： 75-81 1998年

Water discharge from the Lirung Glacier in Langtang Valley, Nepal Himalayas. 1996. 査読有り

Sakai A, Fujita K, Aoki T, Asahi K, Nakawo M

Bulletin of Glacier Research 15 巻頁： 79-83 1997年7月

Meteorological observation in Langtang Valley, 1996. 査読有り

Fujita K, Sakai A, Chhetri TB

Bulletin of Glacier Research 15 巻頁： 71-78 1997年7月

Basic studies for assessing the impacts of the global warming on the Himalayan cryosphere, 1994-1996. 査読有り

Nakawo M, Fujita K, Ageta Y, Shankar K, Pokhrel AP, Yao T

Bulletin of Glacier Research 15 巻頁： 53-58 1997年7月

Monitoring and prediction of shrinkage of a small glacier in the Nepal Himalaya. 査読有り

Kadota T, Fujita K, Seko K, Kayastha RB, Ageta Y

Annals of Glaciology 24 巻頁： 90-94 1997年

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