1.Climate Center of Guangdong Province;2.Chongqing Climate Center
2022年“龙舟水”期间（5月21日-6月21日），华南平均降雨量472.5 mm，为有气象记录以来历史同期第二多，其中广东为1951年以来历史同期第3多,广西为历史同期最多。受其影响，珠江流域出现流域性洪水，北江流域出现特大洪水，造成严重洪涝灾害。利用华南192个国家气象观测站逐日降水资料，NCEP/NCAR大气环流再分析资料,NOAA月平均海表温度资料（ERSST V5）、向外长波辐射（OLR）资料，采用相关、合成分析的方法研究了2022年华南“龙舟水”异常与大气环流和海温异常的关系。结果表明，2022年“龙舟水”期间，东亚大槽、东北冷涡偏强，南下冷空气偏强，同时西太平洋副热带高压和南支槽均偏强，在华南存在明显水汽辐合。2022年发生的拉尼娜事件，大气环流对其有明显响应，Walker环流增强，华南对流明显加强，菲律宾以东存在异常反气旋环流，副高加强导致其西北侧的西南风加强，向华南水汽输送显著增强，同时华南存在显著的上升运动。大气环流和海温的异常导致2022年华南极端“龙舟水”。
During the Dragon-boat precipitation period in 2022 (from May 21 to June 21), the average precipitation in South China is 472.5 mm, which is the second largest in the same period in history, it is the third largest in Guangdong，Guangxi is the largest in the same period since there are meteorological records history in 1951. Under its influence, River basin flood occurs in the Pearl River basin, and catastrophic floods occurs in the Beijiang River basin. Using the daily precipitation data of 192 national meteorological observation stations in South China, NCEP/NCAR atmospheric circulation，atmospheric outward long wave radiation(OLR) data and NOAA monthly scale SST reanalysis data, the characteristics of South China Dragon-boat precipitation anomaly in 2022 and its relationship with atmospheric circulation and sea surface temperature are studied by using correlation and composite analysis methods. The results show that the East Asia Trough and the Northeast Cold Vortex are significantly strengthened, the cold air affecting South China is strong. The Western Pacific Subtropical High and the South Branch Trough are both relatively strong, and there is significant water vapor convergence in South China during the Dragon-boat precipitation period in 2022. The atmospheric response to the La Nina event is obvious in 2022, and the Walker circulation is enhanced. The convection in South China strengthened obviously. An abnormal anticyclone circulation was in the east of the Philippines. The Western Pacific Subtropical High becomes stronger, the southwest wind on its northwest side is stronger. Water vapor transmission to South China has increased significantly, Water vapor transmission to South China increased significantly. the significant enhancement of water vapor transport to South China. A significant upward movement at the same time in South China. The abnormality of atmospheric circulation and SST lead to the extreme Dragon-boat precipitation in South China in 2022.
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