气象科学2024，Vol.44Issue(2)：222-234,13.DOI:10.12306/2024jms.0019
中高纬瞬变涡旋活动对我国东部夏季降水的影响
The influence of middle-to-high latitude transient eddies on summer precipitation anomalies in eastern China
摘要
Abstract
Based on the reanalysis data JRA-55(Japanese 55-year Reanalysis)of the Japanese Meteorological Agency(JMA)and the satellite precipitation data of the Climate Prediction Center(CPC)in the United States from 1981 to 2020,the characteristics of transient eddies and their effects on the summer precipitation anomalies in eastern China were analyzed,and the possible mechanisms for these effects were discussed.Results show that the region from Mongolia to Northeast and North China is not only an active region of transient eddies,but also a large value region of transient eddy transport.The meridional transport of heat and moisture that plays a dominant role in the transient eddy transport process,is an important source of heat and moisture in middle-to-high latitude.According to the intensity of the heat and moisture transport variability of the transient eddies,the key regions of the transient heat and moisture transport were identified as(45°-60°N,100°-130°E)and(35°-50°N,100°-120°E),respectively,and the transient heat and moisture indices were defined.The regression results with the summer precipitation anomalies in eastern China show that the transient eddy activities have significant effects on the summer precipitation in eastern China.The anomalies of transport of heat,moisture and momentum by the middle-to-high latitude synoptic scale transient eddies has formed a feedback to the mean flow through the wave-flow interaction process,resulting in anomalies of seasonal mean circulation,moisture distribution and moisture transport,and thus causing precipitation anomalies under the combined influence of thermal,dynamic and moisture conditions.关键词
中高纬瞬变涡旋/经向热量输送/经向水汽输送/我国夏季降水异常Key words
transient eddies in middle-to-high latitudes/meridional heat transport/meridional moisture transport/summer precipitation anomalies in China分类
天文与地球科学引用本文复制引用
王佳怡,房佳蓓,胡海波..中高纬瞬变涡旋活动对我国东部夏季降水的影响[J].气象科学,2024,44(2):222-234,13.基金项目
国家重点研发计划资助项目(2022YFF0801702 （）
2022YFE0106600) （）
