AN ANALYSIS OF DISTRIBUTION AND MESOSCALE STRUCTURE OF PRECIPITATION ABOUT LANDFALL TROPICAL CYCLONE KOPPU (0915) |
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Authors: | AN Cheng YUAN Jin-nan MENG Wei-guang ZHANG Yan-xia and JIANG De-hai |
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Institution: | 1. Guangzhou Institute of Tropical and Marine Meteorology/Guangdong Provincial Key Laboratory
of Regional Numerical Weather Prediction, CMA, Guangzhou 510080 China; 2. Army Troops Unit
68028, Lanzhou 730058 China |
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Abstract: | Observation from automatic weather stations, radars and TRMM satellites are employed
to investigate the precipitation distribution of tropical cyclone (TC) Koppu (0915) that made
landfall on Guangdong province in 2009. The results show that the precipitation of landfall TC
Koppu is featured by significant asymmetry and mesoscale structure, and occurs mainly to the
left of its moving path. By examining the sea surface temperature (SST), water vapor flux, Q
vector, vertical wind shear of environment etc., it is found out that the distribution of SST,
water vapor convergence, low-level convective ascending and vertical wind shear facilitates
the TC precipitation to take place to the left of the TC moving path. The mesoscale structure
separated by Barnes band-pass filter presents that the precipitation of landfall KOPPU has
some organized mesoscale spiral structures, which is around the TC center and composed of the
form of belts or blocks. The heavy local rainfall of landfall TC Koppu is primarily associated
with the rainfall due to mesoscale spiral structure. |
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Keywords: | precipitation characteristics diagnostic analysis landfall TC KOPPU asymmetric distribution mesoscale structure |
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