| Project/Area Number |
59460040
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| Research Category |
Grant-in-Aid for General Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
気象・海洋・陸水学
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| Research Institution | Water Research Institute, Nagoya University |
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Principal Investigator |
HIGUCHI K. Water Research Institute Nagoya University, 水圈科学研究所, 教授 (50022512)
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| Co-Investigator(Kenkyū-buntansha) |
OHATA T. same, 水圏科学研究所, 助手 (90152230)
YAMAMOTO K. same, 水圏科学研究所, 助手 (60022654)
渡辺 興亜 国立極地研究所, 教授 (60111861)
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| Project Period (FY) |
1984 – 1986
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| Project Status |
Completed (Fiscal Year 1986)
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| Budget Amount *help |
¥7,500,000 (Direct Cost: ¥7,500,000)
Fiscal Year 1986: ¥1,000,000 (Direct Cost: ¥1,000,000)
Fiscal Year 1985: ¥1,200,000 (Direct Cost: ¥1,200,000)
Fiscal Year 1984: ¥5,300,000 (Direct Cost: ¥5,300,000)
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| Keywords | Internal boundary layer / snow cover / melting / 大気-雪氷相互作用 |
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| Research Abstract |
The 3 year project consisted of two sub- project. One was the modification of air mass above snow cover and its effect on areal melting of snow at scale of few tens and hundreds of meters. Another was atmosphere- snow interaction on snow cover of few to few tens of km. The former was mainly studied theoretically by a simulation model and the latter study was composed of field observation of internal boundary layer (IBL) development and surface meteorological parameters. The site of observation was of two type, flat and inclined surface. The following results were obtained.
1) Air mass transformation above snow cover up to few km can be able to be explained by two dimensional diffusion model taking wind speed profile as constant.
2) In case of congregation of patch like snow cover of length L, if the length of snow free part is longer than L, the patches can be considered to be independent from the standpoint of heat supply to the snow surface. If it is less than L, the effect of upwind patch has effect on the melting of the downwind patch.
3) The development of IBL above snow cover is different on flat and inclined surface. On flat land, it develops strongly and there exists a large sreen level air temperature difference, and wind speed weak on the snow cover. However, on inclined mountain terrain, development of IBL was weak and potential air temperature and wind speed was similar on both side of the snow cover edge. Meteorological parameter which showed difference was wind direction. and global radiation.
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