2012 Fiscal Year Final Research Report
Microphysical Structure and its Formation Process Relating to Cloud-to-Ground Lightning Characteristics of Thunderclouds
| Project/Area Number |
22740312
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| Research Category |
Grant-in-Aid for Young Scientists (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
Meteorology/Physical oceanography/Hydrology
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| Research Institution | National Research Institute for Earth Science and Disaster Prevention |
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Principal Investigator |
SHUSSE Yukari 独立行政法人防災科学技術研究所, 観測・予測研究領域 水・土砂防災研究ユニット, 主任研究員 (80415851)
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| Project Period (FY) |
2010 – 2012
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| Keywords | 雷雲 / 落雷特性 / 雲微物理構造 / 偏波レーダー |
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| Research Abstract |
Lightning activity is closely related to the hydrometeor types and those space-time distribution within thunderclouds. In this study, several thunderclouds which showed the distinctive characteristics of cloud-to-ground (CG) lightning were examined to reveal their microphysical structures and evolutions using the X-band polarimetric radars and the lightning location systems. A thundercloud with active .CG lightning started its lightning activity approximately 10 minutes after its occurrence. Polarimetric measurements indicate that a major hydrometeor within its strong echo region was graupel, while it was rain in a non-active thunderstorm. In a thunderstorm dominated +CG lightning, which is uncommon in warm season, it is considered that the positively charged wet graupel in the middle level of the cloud contributed to the generation of the +CG lightnings.
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Research Products
(7 results)
