1996 Fiscal Year Final Research Report Summary
Maritime Continent Thunderstorm Experiment (MCTEX)
| Project/Area Number |
07044090
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| Research Category |
Grant-in-Aid for international Scientific Research
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| Allocation Type | Single-year Grants |
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| Section | Joint Research |
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| Research Institution | KYUSHU UNIVERSITY |
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Principal Investigator |
TAKAHASHI Tsutomu Kyushu University, 理学部, 教授 (20197742)
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| Co-Investigator(Kenkyū-buntansha) |
RUTLEDGE S University of Colorado, USA, 気象学部, 教授
KEENAN T.D Australian Bureau of Meteorological Research Center, 気象局, 研究部長
MORITA O Kyushu University, 理学部, 助教授 (70112290)
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| Project Period (FY) |
1995 – 1996
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| Keywords | Hector / Maritime-Continent / Videosonde / Cloud Organization / Thunderstorm |
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| Research Abstract |
It is well known that huge clouds as high as 17 km seen over the Island of Melville before the Australian Monsoon develop into intense rain and thunder. The Maritime-Continent Experiment (MCTEX) was conducted in the months of Movember and December 1995 to study mainly the mechanism of cloud organization. Our group participated in the project launched 14 newly developed videosondes in close collaboration with the Bureau of Meteorology of Australia in using the doppler radar operated by them.
When Hector cloud developed, very strong rainfall with gusty wind hit the station for half an hour, followed by moderate rain for 2 hours. The intense echo in front of the Hector cloud, large raindrops as large as 9 mm in diameter at the lower level of the cloud, and many frozen drops (hail) around freezing level were observed. The videosondes ascent into the thick layred cloud sent images of enormous number of ice.
The surface electric field shows modified wave pattern, and the high electrification is found in the layr between -10ﾟC and -30ﾟC.It is supposed that drop recirculation in front of the cloud is necessary to grow large raindrops and frozen drops and that new ice particles must be ejected in the process of collision between graupel.
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