WU Hongyu,WU Yao,GUO Yao.On the causes of abnormal intensity of regional winter rainstorm processes in South China[J].Acta Scientiarum Naturalium Universitatis Sunyatseni,2022,61(02):8-17.
WU Hongyu,WU Yao,GUO Yao.On the causes of abnormal intensity of regional winter rainstorm processes in South China[J].Acta Scientiarum Naturalium Universitatis Sunyatseni,2022,61(02):8-17. DOI: 10.13471/j.cnki.acta.snus.2020D073.
On the causes of abnormal intensity of regional winter rainstorm processes in South China
Based on the daily precipitation data of 192 meteorological observation stations in South China during 1961-2018, the regional rainstorm processes in winter in South China are evaluated objectively and quantitatively, and the annual rainstorm intensity index and regional strong winter rainstorms are determined. Based on the reanalysis of NCEP/NCAR data, combining with other methods, the climate background of the severe winter rainstorm in South China and the weather characteristics of the regional rainstorm processes are studied. The common characteristics of climate and weather are as follows: The westerly jet strengthens in the upper troposphere in winter in the Indo-China Peninsula and the South China Sea, the East Asian Trough weakens in the middle layer, the subtropical high over the Western Pacific strengthens, the southern branch trough and southerly current at the lower level strengthen, and the water vapor convergence strengthens. The difference is presented in the heavy rain process at the daily scale in South China in winter, in which the wave train structure of the northern hemisphere subtropical abnormal circulation is very obvious, similar to the ‘remote correlation of silk road’ in the upper troposphere of the northern hemisphere in summer circulation characteristics, but the center of oscillation is southerly in winter than it in summer. For the strong winter rainstorm year, the SST is higher in the equatorial Middle East Pacific, the tropical Indian Ocean, and the South China Sea, while it is lower in the tropical western Pacific from July to December in last year, which was conducive to the occurrence of winter rainstorm in South China. Therefore, the seasonal scale (particularly in winter) circulation and early SST reflect the climate background of the regional rainstorm in South China, while the daily scale atmospheric circulation anomaly can better reflect its abnormal weather characteristics.
关键词
区域性暴雨过程强度大气环流海温冬季华南
Keywords
regional rainstorm processintensityatmospheric circulationSSTwinterSouth China
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