A record-breaking heavy rainfall swept across Suizhou of Hubei province in China on August 12,2021.It was characterized by suddenness and extremeness and caused severe socio-economic losses.To deepen the understanding of such an urban rainstorm and to improve the forecasting ability,this study revealed the dominant atmospheric circulation and moisture sources for this event.We performed a Lagrangian model FLEXPART to understand this event in terms of moisture sources and transport trajectories.Three key circulation systems affecting this extreme event were identified,including the western Pacific subtropical high(WPSH),the low-level southwesterly jet and an anticyclone over northern China.The low-level jet was lifted along the northern dry and cold air mass to form a front,resulting in the heavy rain.The moisture sources located on land contributed about 64％of the moisture.The development of the low-level southwesterly jet in southern China was strengthened near the time of the precipitation occurrence,providing the main moisture supply.Southern China(23°—32.5°N,98°-122°E)was the most important source region,which contributed the most to the precipitation(43.6％).The results highlight the prominent role of the terrestrial water cycle in this extreme precipitation event over Hubei.

Shi-Jia LIU;Tian-Jun ZHOU;Li-Xia ZHANG;Dan ZHAO;Jie JIANG

State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics,Institute of Atmospheric Physics,Chinese Academy of Sciences,Beijing 100029,China;University of Chinese Academy of Sciences,Beijing 100049,China

气候变化研究进展（英文版）

[1]Shi-Jia LIU;Tian-Jun ZHOU;Li-Xia ZHANG;Dan ZHAO;Jie JIANG-.Dominance of terrestrial moisture supply for the record-breaking extreme precipitation in Hubei,China on August 12,2021)[J].气候变化研究进展（英文版）,2022(06):851-857

Suizhou,extremeness

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