Dynamic synthetic analysis of circulation field of tropical cyclones affecting Shanghai  

作　　者：Wen GU Caijun YUE Zhihui HAN Yanqing GAO Yuqi TANG Xiangyu AO Yao YAO 

机构地区：[1]Shanghai Ecological Forecasting&Remote Sensing Center,Shanghai 200030,China [2]Shanghai Marine Meteorological Centre,Shanghai 200030,China [3]Shanghai Typhoon Institute,China Meteorological Administration,Shanghai 200030,China [4]Key Laboratory of Numerical Modeling for Tropical Cyclone(China Meteorological Administration),Shanghai 200030,China

出　　处：《Frontiers of Earth Science》2024年第2期347-363,共17页地球科学前沿（英文版）

基　　金：supported by the National Natural Science Foundation of China(Grant Nos.41875059,41875071,41875051,42005077,and U2142206);the Natural Science Foundation of Shanghai Science and Technology Committee(Nos.21ZR1457700 and 22ZR1456100);East China Phased Array Weather Radar Application Joint Laboratory.

摘　　要：Eleven tropical cyclones(TCs)affected Shanghai and crossed the same latitude as Shanghai from 2007 to 2018.According to similar tracks from best-track data,TCs that cause significant precipitation in Shanghai can be divided into three types:landfall TCs,nearshore northward TCs,and western TCs.Based on ERA5 reanalysis data,the dynamic synthesis method was used to synthesize TC circulation situations to compare thermal,dynamic,water vapor,and stability conditions within TC circulations during the period when they affected Shanghai.The conclusions are as follows.1)When the three TC types are at the same latitude as Shanghai,they are all in the divergent field in the upper troposphere.For the landfall type,the subtropical high at 500 hPa is stronger and farther north than usual,and there is a high-pressure dam on the north side of the TCs.2)The warm advection of the three TC types at 925 hPa is located in the northern quadrant of the TCs.The dynamic and water vapor conditions are good in the north-western quadrant of landfall and western TCs,and more favorable in the eastern quadrant of nearshore northward TCs.3)The favorable effects of all three types on precipitation in Shanghai come from the boundary layer.Water vapor,upward motion,and instability conditions of landfall TCs are superior to the other two TC types.The best water vapor,dynamic,and convective instability conditions are at the northern boundary in Shanghai during landfall TCs,and the main sources of water vapor in Shanghai come from the eastern and northern boundaries.During nearshore northward TCs,the main contribution to precipitation is from the eastern boundary,while better dynamic and water vapor conditions come from the western and northern boundaries during western TCs.The above findings provide scientific and technical support for operational forecasting precipitation from TCs affecting mega-cities.

关 键 词：tropical cyclones dynamic synthetic analysis ERA5 reanalysis SHANGHAI similar track 

分 类 号：P461[天文地球—大气科学及气象学]