| Project/Area Number |
25287125
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Partial Multi-year Fund |
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| Section | 一般 |
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| Research Field |
Meteorology/Physical oceanography/Hydrology
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| Research Institution | Japan, Meteorological Research Institute |
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Principal Investigator |
Kato Teruyuki 気象庁気象研究所, 予報研究部, 室長 (70354438)
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| Co-Investigator(Kenkyū-buntansha) |
山田 広幸 琉球大学, 理学部, 准教授 (30421879)
津口 裕茂 気象庁気象研究所, 予報研究部, 研究官 (90553165)
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| Co-Investigator(Renkei-kenkyūsha) |
SHOJI YOSHINORI 気象庁気象研究所, 気象衛星・観測システム研究部, 室長 (70354446)
TOMITA TOMOHIKO 熊本大学, 自然科学研究科, 准教授 (20344301)
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| Research Collaborator |
HIROKAWA YASUTAKA 気象庁, 仙台管区気象台予報課, 技術専門官
YASUDA OSAMU 気象庁, 沖縄気象台防災調査課, 調査係長
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| Project Period (FY) |
2013-04-01 – 2017-03-31
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| Project Status |
Completed (Fiscal Year 2016)
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| Budget Amount *help |
¥16,250,000 (Direct Cost: ¥12,500,000、Indirect Cost: ¥3,750,000)
Fiscal Year 2015: ¥5,070,000 (Direct Cost: ¥3,900,000、Indirect Cost: ¥1,170,000)
Fiscal Year 2014: ¥5,980,000 (Direct Cost: ¥4,600,000、Indirect Cost: ¥1,380,000)
Fiscal Year 2013: ¥5,200,000 (Direct Cost: ¥4,000,000、Indirect Cost: ¥1,200,000)
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| Keywords | 気象学 / 豪雨 / 水蒸気 |
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| Outline of Final Research Achievements |
Several mechanisms of low-level water vapor accumulation processes were clarified through analyses on heavy rainfall events occurred around Japan. Low-level water vapor field over the sea, called as convective mixing layer, basically forms below a height of about 500 m by dry convection, initiated by water vapor buoyancy. In heavy rainfall cases, water vapor was further accumulated below a height of about 1 km by updrafts associated with low-level mesoscale vortex and trough, and topography such as isthmus. The sea surface temperature distribution around Japan and Tsushima Currents, moreover, largely contributed the accumulation of low-level water vapor. It was also ascertained from enhanced upper-air sounding observations at Naze and Minamidaitojima, whole-year surface observations at a few additional sites, and GNSS observations on ships that dense spatio-temporal observations in the Southwestern Islands and over the sea are significant to recognize the low-level water vapor field.
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