2007 Fiscal Year Final Research Report Summary
Coupling Processes in the Equatorial Atmosphere
| Project/Area Number |
13136202
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| Research Category |
Grant-in-Aid for Scientific Research on Priority Areas
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| Allocation Type | Single-year Grants |
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| Review Section |
Science and Engineering
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| Research Institution | Kyoto University |
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Principal Investigator |
FUKAO Shoichiro Kyoto University, RISH, Professor (30026249)
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| Co-Investigator(Kenkyū-buntansha) |
SATO Toru Kyoto University, Graduate School of Informatics, Professor (60162450)
KOZU Toshiaki Shimane University, 総合理工学部, Professor (00314617)
TSUDA Toshitaka Kyoto University, RISH, Professor (30115886)
NAGASAWA Chikao Tokyo Metropolitan University, システムデザイン研究科, Professor (80145664)
OGAWA Tadahiko STE, Nagoya University, 太陽地球環境研究所, Professor (60271607)
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| Project Period (FY) |
2001 – 2007
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| Keywords | Equatorial Atmosphere / Global observation / Remote Sensing / Upper-Atomospheric Phisics / International collaboration / Campaign observation / Equatorial Atmosphere Radar(EAR) / Radar network |
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| Research Abstract |
The Indonesian Archipelago is one of the centers of intense atmospheric motions over the globe. The mechanisms of these atmospheric motions and their changes, however, have not yet been made clear due to the sparseness of observational data in that region. The Coupling Processes in the Equatorial Atmosphere (CPEA), a six-year research project of Japan, was conducted in Indonesia to observationally elucidate dynamical and electrodynamical coupling processes occurring in the equatorial atmosphere from September 2001 to March 2007. During six years of CPEA, a new Equatorial Atmosphere Observatory was established with the Equatorial Atmosphere Radar (EAR) as the core facility in Kototabang, West Sumatra, Indonesia (0.20??S, 100.32??E). In the present talk we will review some highlights from this project. First, it has been found, contrary to the traditional expectation, that deep convection over Sumatra Island is observed in inactive phase of Madden-Julian Oscillation (MJO), while shallow convection is dominant in active phase. Secondly, clear correlation between deep convection and enhanced inertia gravity waves with period 2-3days was found with their wave source identified as slowly eastward advecting convection. Thirdly, Kelvin waves with periods 10-12 days near the tropopause and 5.5-8 days in the lower stratosphere were detected locally overIndonesia and globally by CHAMP-GPS. Fourthly, several pieces of evidence have been provided to demonstrate that long-term variability in the troposphere influences the dynamics of the mesopause-homopause region. Finally, it has been suggested that gravity waves near 100 km in altitude contribute to generation of plasma bubbles.
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Research Products
(271 results)
