On the moisture transport regimes for extreme precipitation over North China

• DOI: 10.1016/j.atmosres.2024.107254
• Publication Date: 2024-01-15T06:04:49Z
• Authors: Mingxi Zhang; Yu Zhang; Yinglin Tian; Di Xie; Yuan Cao; Yuantao Mei; Tiejian Li; Guangqian Wang; Deyu Zhong
• Keywords: Subtropical ridge; Peninsula; Atmospheric Circulation

A novel clustering method combing the Spearman's rank spatial correlation and spectral is proposed to investigate variability in moisture transport. Four transport regimes for extreme precipitation events (EPEs) over North China are identified through applying new source distributions of 232 EPEs during rainy season (June–September) 1979–2018. The four comprise approximately 50%, 21%, 20%, 9% EPEs, with counts 115, 48, 47, 22, respectively. Each regime exhibits distinctive patterns. In each regimes, areas higher sources than other three (meeting statistical significance) are: Indian Ocean Indochina Peninsula 1, South Sea western Pacific 2, its adjacent 3, around Maritime Continent 4. Furthermore, atmospheric circulations before onset manifest different patterns across regimes. Multiple meteorological phenomena associated circulation prior e.g., westward extension (observed 1 2) eastward retreat (regime 4) Subtropical High (WNPSH), an upper-level wave train propagating from Russia Japan (regimes 3), extensive river (AR) activities 4), tropical cyclones 4). have critical impacts on could serve as precursor signals EPEs.