1.Key Laboratory of Meteorological Disaster,Ministry of Education/Joint International Research Laboratory of Climate and Environment Change/Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters,Nanjing University of Information Science and Technology;2.Air Traffic Management Bureau,Anhui Province in east China branch
The warm-sector rainstorm (WR) with warm shear pattern (WSWR) over Yangtze-Huaihe river region were studied in this paper. Based on the definition of WR and shear-line, and the objective identification criteria of meso-scale rainstorm cluster (CRA), front and shear-line, this study use the merged rain gauge-satellite gridded hourly precipitation dataset and ERA5 reanalysis data to identify the WSWR over Yangtze-Huaihe River Basin (YHRB) during 2010~2017. A total of 1268 WR clusters have been identified over the 8 years. There are 451 WSWR clusters of the total WR clusters, and frequently occur over the junction of the Anhui, Jiangxi, and Hubei province and the coastal areas of Jiangsu and Zhejiang province. In addition, the WSWR clusters exhibit similar horizontal distribution with the WR clusters over YHRB. The WSWR clusters occur mainly from mid-June to mid-July. During this period, the WSWR clusters, with averaged hourly precipitation of 29mm, account for more than 40% of the total WR clusters and gradually move northward, consistent with the migration of the main rainfall belt. The occurrence of WSWR clusters show significant diurnal variation, with one peak from morning to early-afternoon (0800~1300 LST) and the other after sunset (2000~2200 LST). The maximum precipitation of WSWR clusters appeared during afternoon (1300~1900 LST) and early morning (0100~0500 LST), respectively.