| Project/Area Number |
10440133
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| Research Category |
Grant-in-Aid for Scientific Research (B).
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Meteorology/Physical oceanography/Hydrology
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| Research Institution | KOBE UNIVERSITY |
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Principal Investigator |
YAMAKA Manabu GSST.Kobe University, Pressor, 大学院・自然科学研究科, 教授 (30183982)
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| Co-Investigator(Kenkyū-buntansha) |
IWAYAMA Takahiro GSST.Kobe University, Associate Professor, 大学院・自然科学研究科, 助教授 (10284598)
HASHIGUCHI Hiroyuki RASC.Kyoto University, Research Asscoiate, 超高層電波研究センター, 助手 (90293943)
OGINO Shin-ya GSST.Kobe University, Research Associate, 大学院・自然科学研究科, 助手 (80324937)
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| Project Period (FY) |
1998 – 2000
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| Project Status |
Completed (Fiscal Year 2000)
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| Budget Amount *help |
¥13,400,000 (Direct Cost: ¥13,400,000)
Fiscal Year 2000: ¥600,000 (Direct Cost: ¥600,000)
Fiscal Year 1999: ¥2,100,000 (Direct Cost: ¥2,100,000)
Fiscal Year 1998: ¥10,700,000 (Direct Cost: ¥10,700,000)
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| Keywords | Cloud convection / Inertio-gravity wave / GPS rawinsonde / Monsoon / Boundary-layer radar / Quasi-biennial oscillation / El nino southern oscillation / Climate change |
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| Research Abstract |
The objective of this three-year research is to study could convections, inertio-gravity waves and their interactions, based on observations and data collections in Japan, Thailand and Indonesia.
In order to obtain high-resolution vertical profiles of wind and temperataure, a transportable GPS rawinsonde system has been installed. Time and spatial variations have been separated by simultaneous rawinsonde-radar observations at radar sites such as Shigaraki. Japan and Serpong and Kototabang Indonesia. Furthermore, operational rawinsonde data in Japan, Thailand and Indonesia have been collected, and objective analysis data by JMA and NOAA haver been used for comparison. All the observational data have been analized climatologically. Wave parameters and convection activities have been obtained quantitatively as functions of season, altitude, (latitude, longitude.) and background meteorological parameters (varied with synoptic-scale disturbances and monsoon circulations).
Technologically, we have established the rawinsonde observations as a useful method for inertiogravity waves although the wind fluctuation amplitude is somewhat attenuated. Applying this technique to operational rawinsonde data, we have found that waves induced by orography of eastern Japan produce a maximum of inertio-gravity waves in the lower stratosphere in winter, and day-to-day and interannual variations associated with those of troposphere. Convective cloud activities and inertio-gravity wave activities have been studied and compared with each other also for Baiu season. In tropics, correlations between waves with periods of a few days to about ten days and precipitating convective clouds have been found. Correlations between gravity-wave activity, convective cloud activity and background wind and temperature have been recognized also in a quasi-biennial time-scale both in Japan and tropics.
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