2021年沈阳桃仙机场暑期降水异常特征及成因分析  

Analysis on Characteristics and Causes of Summer Precipitation Anomalies at Shenyang Taoxian Airport in 2021

作　　者：庞丹琦 PANG Danqi(Northeast Air Traffic Management Bureau CAAC,Shenyang 110043,Liaoning,China)

机构地区：[1]中国民用航空东北地区空中交通管理局,辽宁沈阳110043

出　　处：《民航学报》2023年第5期95-98,共4页Journal of Civil Aviation

摘　　要：利用2001~2021年6~9月沈阳桃仙机场地面气象观测资料和NECP/NCAR月尺度再分析数据,分析2021年沈阳桃仙机场暑期降水异常特征及成因。结果表明:6、9月降水量相比于历史同期偏多,7、8月降水量偏少,沈阳桃仙机场暑期雨季降水较不集中,降水分配异常。大尺度环流系统和水汽输送的异常配置是导致2021年沈阳桃仙机场暑期降水异常的主要原因。6月亚洲中高纬度地区500 hPa高度场与历史同期相比呈负距平,该月东北冷涡异常活跃导致降水日数长、降水量偏多。7月副热带高压北抬稳定在华北、东北一带,沈阳地区受副热带高压控制造成降水严重偏少。8月沈阳地区水汽通量散度距平场呈正距平,水汽输送较常年偏弱,而9月沈阳地区水汽通量散度距平场呈负距平,表明进入沈阳地区水汽输送较常年异常偏强,造成该月降水偏多。Based on the surface meteorological observation data and NECP/NCAR monthly scale reanalysis data of the Taoxian Airport in Shenyang during June to September of 2001 to 2021,the characteristics and causes of summer precipitation anomalies in the Shenyang Taoxian Airport in 2021 are analyzed.The results show that the precipitation in June and September is more than that in the historical period,and the precipitation in July and August is less than that in the historical period.The precipitation in summer rainy season of the Shenyang Taoxian Airport is not concentrated,and the precipitation distribution is abnormal.The abnormal configuration of large-scale circulation system and water vapor transport is the main reason for the summer precipitation anomaly in the Shenyang Taoxian Airport in 2021.In June,the height field of 500 hPa in the middle and high latitudes of Asia shows a negative anomaly compared with the historical period.The abnormal activity of Northeast cold vortex in June results in longer precipitation days and more precipitation.In July,the subtropical high moves northward and stabilizes in North China and Northeast China,and the precipitation in Shenyang area is severely low due to the control of the subtropical high.In August,the water vapor flux divergence anomaly field in Shenyang area is positive and the water vapor transport is weaker than usual,while in September,the water vapor flux divergence anomaly field in Shenyang area is negative,indicating that the water vapor transport into Shenyang area is stronger than usual,resulting in more precipitation in this month.

关 键 词：降水异常 大尺度环流 沈阳 夏季降水 

分 类 号：P468[天文地球—大气科学及气象学]