| Project/Area Number |
12440127
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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 | KYOTO UNIVERSITY |
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Principal Investigator |
NAKAMUR Atakuji Kyoto University, Radio Science Center for Space and Atmosphere, Associate Professor, 宙空電波科学研究センター, 助教授 (40217857)
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| Co-Investigator(Kenkyū-buntansha) |
TSUDA Toshitaka Kyoto University, Radio Science Center for Space and Atmosphere, Professor, 宙空電波科学研究センター, 教授 (30115886)
HORINOUCHI Takeshi Kyoto University, Radio Science Center for Space and Atmosphere, Research Associate, 宙空電波科学研究センター, 助手 (50314266)
NISHI Noriyuki Kyoto University, Graduate School of Science, Research Associate, 理学研究科, 助手 (00222183)
TAKEMI Tetsuya Oosaka University, Graduate School of Engineering, Research Associate, 工学研究科, 助手 (10314361)
FUJIWARA Masatomo Kyoto University, Radio Science Center for Space and Atmosphere, JSPS Research Fellow, 宙空電波科学研究センター, 学振特別研究員
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| Project Period (FY) |
2000 – 2002
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| Project Status |
Completed (Fiscal Year 2002)
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| Budget Amount *help |
¥15,200,000 (Direct Cost: ¥15,200,000)
Fiscal Year 2002: ¥3,000,000 (Direct Cost: ¥3,000,000)
Fiscal Year 2001: ¥5,800,000 (Direct Cost: ¥5,800,000)
Fiscal Year 2000: ¥6,400,000 (Direct Cost: ¥6,400,000)
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| Keywords | Atmospheric waves / Mesoscale modeling / Water vapor / Mesopause / Cumulous convection / Equatorial region / Airglow imaging / Transport between the troposphere and the stratosphere / オゾン / 重力波欣起 / 対流圏成層圏成層圏物質交換 / 重力波励起 |
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| Research Abstract |
In the equatorial region, cumulous convections are extremely active which generate atmospheric waves. These waves propagate upward, affecting the circulations in the lower and middle atmospheres, as well as transporting energy into the thermosphere. In this study, we clarified the mechanisms underlying the convection and the atmospheric waves by comparing the details of the observational results and the four dimensional dataset produced by the numerical modeling by means of data assimilation technique. We, first, analyzed the observational dataset accumulated so far, and then new dataset collected by a novel precise observation techniques is utilized. Precise water vapor measurement around the tropopause was carried out in Indonesia, and the transport associated with the convective activity has been clarified. Airglow imaging observation over one year in Indonesia has revealed the climatology of small scale gravity waves in the mesopause region for the first time, and clear association with horizontal distributions of cumulous clouds has been found. A long term observation by the MLT radars clarified the relation between the intraseasonal variations in the MLT region and atmospheric wave activity in the lower atmosphere. Three dimensional modeling using these observational data clearly showed the gravity waves excited by the cumulous convection propagate into the mesospause region and break there. Further comparisons with the airglow imaging observations clarified the mechanism of gravity wave generation, propagation, breaking and associated atmospheric instability. Input from the new satellite data and further improvement of modeling such as extension of the simulation space and improvement of resolutions would greatly contribute to the understanding of global impact of the atmospheric waves in the lower and middle atmosphere.
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