Moisture sources for the weather pattern classified extreme precipitation in the first rainy season over South China

• DOI: 10.1002/joc.7576
• Publication Date: 2022-02-16T14:39:26Z
• Authors: Fan Xin; Dongdong Peng; Run Liu; Shaw Chen Liu
• Keywords: Geopotential height; Anomaly (physics); BENGAL; Geopotential; Wet season

Abstract Moisture transport, associated with moisture sources and synoptic‐scale weather conditions, is a key dynamic process of precipitation events. Using the K ‐means clustering method FLEXPART Lagrangian particle dispersion model, this paper investigates contributions from different source regions to extreme in first rainy season (hereafter FRS) over South China. In average, land contribute more FRS China than ocean regions. The main are Southeast Asia (22.7%), (17.2%), Sea (14.3%), Bay Bengal (8.3%). Extreme events classified into three types by based on 850 hPa geopotential height, which all characterized an anomalous low‐pressure system varying intensity locations. distribution height anomaly for Type I (30.3%) low trough extending Japan China, while II (42.5%) III (27.2%) “west negative–east positive” “north positive–south negative” patterns East cyclone respectively. much larger contribution mainly concentrated III, each region similar. Ocean play important role Indian (16.2%) onset summer monsoon.