| 摘要: |
| 该文利用2019年6—7月黔东南州16个国家气象观测站降水资料、NCC\CMA资料和NCAR逐日6 h再分析资料，对黔东南州2019年6—7月降水量异常情况进行分析，并从大尺度环流背景、水汽、热力和动力条件等方面分析降水异常的原因。结果表明：2019年6—7月黔东南州总降水量较常年同期偏多，是自1981年以来同期排位第8，降水偏多的主要原因是由于持续降水时间较长以及日降水量≥25 mm以上的日数较多造成。6—7月在中高纬度地区环流经向度大、南压高压和西北太平洋副热带高压稳定维持的大尺度环流背条件下，黔东南州位于南亚高压东部脊线附近辐散区和副高西北侧西南暖湿气流不稳定区，且受500 hPa高原多波动东移影响；低层辐合、高层辐散配置较好；水汽充足、能量充沛、动力辐合较强，有利于黔东南州降水天气过程的发生发展。上述有利条件，导致黔东南州2019年6—7月降水偏多。 |
| 关键词: 黔东南州；6—7月降水；大尺度环流背景；水汽条件；热力条件；动力条件 |
| DOI： |
| 投稿时间：2019-11-04 |
| 基金项目: |
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| The Analysis of Precipitation Anomaly in Qiandongnan from June to July 2019 |
| YANG Ping,XIE Zhipei |
| (Sansui Meteorological Bureau of Guizhou Province,Sansui 556500 ,China;Huishui Meteorological Bureau of Guizhou Province,Huishui 550600 ,China) |
| Abstract: |
| The precipitation data of 16 national meteorological observation stations in Qiandongnan,the NCC/ CMA data and NCAR re-analyzes data every day at 6h were used to analyze the abnormal precipitation of June and July in Qiandongnan Prefecture in the summer of 2019,and analyze the causes of precipitation anomalies from the large-scale circulation background, water vapor, thermal and dynamic conditions, etc.The results show:from June to July in 2019, the total precipitation of Qiandongnan prefecture was higher than the same period of the previous year, ranking the eighth place in the same period since 1981,the main reason for the excessive precipitation is due to the long duration of continuous precipitation and the number of days with daily rainfall ≥25mm.From June to July, the meridional direction of the circulation is large in the middle and high latitudes,under the conditions of large-scale circumventional conditions in which the south pressure and the northwest Pacific subtropical high are stably maintained,Qiandongnan is located in the divergent area near the eastern ridgeline of the South Asian High and the southwest of the subtropical high in the southwestern warm and humid airflow instability zone,and affected by the eastward shift of the 500hPa plateau.The low level convergence and high level divergence are well arranged,Sufficient water vapor, abundant energy, and strong power convergence are beneficial to the occurrence and development of precipitation and weather processes in Qiandongnan.The above favorable conditions lead to a large amount of precipitation in Qiandongnan from June to July 2019. |
| Key words: Qiandongnan； June-July precipitation； large-scale circulation background； water vapor condition；thermal condition；dynamic condition |
