ISSN 1000-0526
CN 11-2282/P
CN 11-2282/P
Comparative Analysis of the Effects of Three Different Cold Air Processes on Extreme Precipitation of Landfall Typhoon in Fujian
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Abstract:
In view of the extremely strong extreme rainstorm process caused by Typhoon Haikui (2311) , Doksuri (2305) and Megi (1617) in the coastal area of South China, using multi-source data such as National Ground Encryption Automatic Station Data, ERA5 and GDAS reanalysis data, the HYSPLIT 5.0 trajectory model Quantitative analysis the contribution of cold air and water vapor to transport paths and their different sources, the effects of different intensity cold air cooling and warming modes and water vapor transport on extreme precipitation were compared. The results show that different cold air intensity, path and water vapor transportation effect lead to different typhoon heavy precipitated area and intensity. Heavy precipitation area of Haikui tends to be zonal type along the easterly wind under the influence of the denatured cold air that originated in Mongolia. The weak cold air on the east and west routes of Megi originated from East and Central Asia in the West Siberia, respectively. And the precipitation have meridional type of Megi along the inverted trough under the influence of cold air. Even if there is no cold air affect Doksuri, the continuous train effect caused by Doksuri lead to extreme precipitation which along the southwest jet stream. The analysis also shows that the water vapor transport in the South China Sea and the western Pacific passage between Haikui and Doksuri is dominant(the contribution rate of water vapor is 90.4 % and 100 %, respectively), Rainfall is extreme; poor water vapor transport (25.5 %) in the South China Sea and the western Pacific leads to lower precipitation intensity in Megi than in Haikui and Doksuri, but the wider cold air affects the range of Megi extreme precipitation areas.
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