doi:  10.3878/j.issn.1006-9895.1901.18188

Formation of Rainy and Snowy Weather in South China in January 2018 and Its Relationship with the Abnormal East Asian Winter Monsoon
摘要点击 330  全文点击 265  投稿时间:2018-07-05  
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基金:  国家自然科学基金项目41675086,国家科技支撑计划项目2015BAC03B03
中文关键词:  2018年1月  南方雨雪冰冻事件  东亚冬季风  南北反相模态
英文关键词:  January in 2018  Rainy and snowy weather in South China  East Asian winter monsoon (EAWM)  EAWM mode with opposite signs of variation in the South and North
彭京备中国科学院大气物理研究所国际气候与环境科学中心,北京 100029
孙淑清中国科学院大气物理研究所国际气候与环境科学中心,北京 100029
Citation:.2019.Formation of Rainy and Snowy Weather in South China in January 2018 and Its Relationship with the Abnormal East Asian Winter Monsoon[J].Chinese Journal of Atmospheric Sciences (in Chinese),43(6):1233-1244,doi:10.3878/j.issn.1006-9895.1901.18188.
      During the periods January 3rd to January 7th and January 24 to January 28, 2018, there were two rain and snow weather events over South China. The formative mechanisms for these storms and their relationship with an abnormal East Asian Winter Monsoon (EAWM) were studied using station observations and NCEP/NCAR reanalysis datasets. The results showed the mid-tropospheric circulation leading to these weather processes featured a persistent and stable ridge around the Ural Mountains, and active perturbations along both the mid-latitude westerlies and southern branch of the subtropical jet (SBJ). Due to the effects of cold air and the active perturbations along the SBJ, South China experienced extensive precipitation and snow. Simultaneously, there appeared an anomalously strong polar vortex in the stratosphere, which favors persistent and stable circulation systems in the troposphere. In January of 2018, the strength of the EAWM in the south and north were different. Most of the time, variations in the low-latitude and mid-high-latitude components of EAWM were inconsistent or even of opposite signs. Rainy and snowy weather in South China tends to occur when the EAWM presents itself in an opposing variation mode, i.e., a pattern of anomalous northerly winds to the north against southerly to the south. The relationship between the precipitation in South China and the opposing variation mode of the EAWM are also discussed on a seasonal scale, with the results confirming the above conclusions.
主办单位:中国科学院大气物理研究所 单位地址:北京市9804信箱
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