doi:  10.3878/j.issn.1006-9895.1901.18188

Formation of Rainy and Snowy Weather of South China in January 2018 and Its Relationship with Abnormal East Asian Winter Monsoon
摘要点击 30  全文点击 9  投稿时间:2018-07-05  修订日期:2018-12-03
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基金:  国家自然科学基金
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  East Asian winter monsoon mode with opposite signs of variation in the south and north
孙淑清Sun Shuqing中国科学院大气物理研究所
彭京备Peng Jingbei中国科学院大气物理研究所
Citation:Sun Shuqing,Peng Jingbei.2019.Formation of Rainy and Snowy Weather of South China in January 2018 and Its Relationship with Abnormal East Asian Winter Monsoon[J].Chinese Journal of Atmospheric Sciences (in Chinese)
      During January 3 to January 7 and January 24 to January, 2018, there were two rainy and snowy weather processes over South China. The formation mechanism and its relationship with abnormal East Asian Winter Monsoon (EAWM) are studied by using station observations and NCEP/NCAR reanalysis datasets. The results show the mid tropospheric circulation leading to the weather process is featured by a persistent and stable ridge around the Ural Mountains, and active perturbations along both the mid-latitude westerlies and southern branch of subtropical jet (SBJ). Due to the effects of cold air and the active perturbations on SBJ, South China experiences extensive precipitation and snow. In the meantime, there appears an anomalous strong polar vortex in the stratosphere, which favors to the persistent and stable circulation systems in the troposphere. In January of 2018, the strength of the East Asian Winter Monsoon (EAWM) in the south and north are different. In most time, the variations of the low-latitude and mid-high-latitude components of EAWM were inconsistent or even with opposite signs. Rainy and snowy weather in South China tends to occur when EAWM presents itself an opposite variation mode, i.e. a pattern of northerly abnormal winds to the north against southerly to the south. The relationship between the precipitation in South China and the opposite variation mode of EAWM are also discussed on seasonal scale, and the results confirms the above conclusions.
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