热带气象学报2024，Vol.40Issue(2)：169-177,9.DOI:10.16032/j.issn.1004-4965.2024.016
7-9月登陆华南热带气旋频数异常与大气环流和海温的关系
Anomalous Frequency of Tropical Cyclones Landing in South China and its Relationship with Atmospheric Circulation and SST from July to September
摘要
Abstract
This study examined the variation characteristics of the frequency of tropical cyclones landing in South China from July to September over the 73 years from 1949 to 2021.Data employed included those from the Shanghai Typhoon Institute of the China Meteorological Administration,NCEP/NCAR reanalysis data,NOAA reconstructed sea surface temperature(SST)data,and atmospheric long-wave radiation(OLR)data.The variation characteristics of the frequency of tropical cyclones landing in South China from July to September in the past 73 years were analyzed by using methods such as linear trend analysis and Mann Kendall test.The relationship between the anomalous frequency of tropical cyclones landing in South China from July to September and the atmospheric circulation and early SST was analyzed by using synthesis and correlation methods.The results showed that a total of 243 tropical cyclones made landfall in South China between 1949 and 2021,with 70.2%occurring from July to September(averaging 3.3 cyclones per year).The frequency of tropical cyclones landing in South China exhibited significant interannual and interdecadal variations.The maximum frequency was found in 1973(7 cyclones),while the minimum was observed in 1950(0 cyclones).There was a shift from more in the early stages to less in the later stages in the mid-1990s,although no abrupt changes were observed.The frequency of tropical cyclones landing in South China has decreased at a rate of 0.1 cyclones per decade in these 73 years.The anomalous frequency of tropical cyclones landing in South China from July to September was closely related to atmospheric circulation and SST anomalies.During the same period in anomalous years,the following patterns were observed:(1)In the difference field of atmospheric circulation,the South Asia High was stronger and shifted eastward and northward,while the Subtropical High was stronger and shifted westward and northward.The easterly flow east of 110°E in the equatorial region intensified,along with a strengthened monsoon trough.The sea-level pressure field in the middle and low latitudes of the Northern Hemisphere showed an east-high,west-low pattern,with higher pressure in the north and lower pressure in the south.At the same time,convective activities in the South China Sea and the western Pacific in the thermal zone were strengthened.(2)In difference field the SST,the equatorial middle and eastern Pacific was cooler,the western Pacific warm pool was warmer,and the Walker circulation was strengthened.The difference in atmospheric circulation and SST in the upper,middle and lower levels may be the reason for the anomalous frequency of tropical cyclones landing in South China.关键词
热带气旋频数/大气环流/海温/华南Key words
tropical cyclone frequency/atmospheric circulation/SST/South China分类
天文与地球科学引用本文复制引用
伍红雨,吴遥,张柳红..7-9月登陆华南热带气旋频数异常与大气环流和海温的关系[J].热带气象学报,2024,40(2):169-177,9.基金项目
国家自然科学基金项目(41930972) （41930972）
2022年度省级灾害及应急管理专项资金项目"2022年应急风险分析与应急能力建设研究" （）
广东省气象局科技创新团队(GRMCTD202101)共同资助 （GRMCTD202101）
