投稿时间:2017-03-21  修订日期:2017-11-21  点此下载全文
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李慧 南京信息工程大学 气象灾害教育部重点实验室/气候与环境变化国际合作联合实验室/气象灾害预报预警与评估协同创新中心, 江苏 南京 210044
中国气象科学研究院, 北京 100081 
陆尔 南京信息工程大学 气象灾害教育部重点实验室/气候与环境变化国际合作联合实验室/气象灾害预报预警与评估协同创新中心, 江苏 南京 210044 
翟盘茂 中国气象科学研究院, 北京 100081  
李肇新 南京信息工程大学 气象灾害教育部重点实验室/气候与环境变化国际合作联合实验室/气象灾害预报预警与评估协同创新中心, 江苏 南京 210044  
陈阳 中国气象科学研究院, 北京 100081  
甘如玉 南京信息工程大学 气象灾害教育部重点实验室/气候与环境变化国际合作联合实验室/气象灾害预报预警与评估协同创新中心, 江苏 南京 210044  
中文关键词:持续性降水  大气环流  梅雨  波活动通量  对流活动
The impact of Rossby waves and the tropical convection activities on two precipitation events occurring before and during the June 2010 Meiyu period
Abstract:In this study,using daily data from the NCEP/NCAR reanalysis dataset and precipitation observations recorded at 574 stations,two heavy rainfall processes during the periods of June 7-11 and 18-22,2010 occurring in the middle and lower reaches of the Yangtze River(MLRYR) are compared based on their respective circulations,Rossby wave activity fluxes,and tropical convection activities.The results show that a downstream propagation Rossby wave and double-block high were present in the mid-high latitudes throughout the time when these two processes occurred.During these events,it is shown that the intensity of the western Pacific subtropical high(WPSH) was stronger and the western extension point was more westward than normal in the low latitudes.However,two major differences are observed between the events:1)The source of the Rossby wave was located in northern Europe.Due to a low-pressure trough over the Lake Baikal area,the cold air turned southward to about 36°N.At the same time,the strengthened and westward WPSH were located at about 95°E.Next,the cold and warm air converged,leading to heavy rainfall.2)The source of the Rossby wave was located in northern Europe and central Siberia.The low-pressure trough in East Asia was more prominent than in the first rainfall process,which was conducive to the cold air reaching the MLRYR(about 30°N).In addition,the westward extension of the WPSH was located at about 90°E.The cold and warm air converged in the MLRYR and in its southern area,thereby leading to heavy precipitation in these regions.
keywords:persistent precipitation  atmospheric circulation  Meiyu  wave activity flux  convective activity
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