doi:  10.3878/j.issn.1006-9895.1901.18188
2018年1月南方雨雪天气的形成及其与冬季风异常的关系

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 119  全文点击 46  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
     
作者中文名作者英文名单位
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
引用:孙淑清,彭京备.2019.2018年1月南方雨雪天气的形成及其与冬季风异常的关系[J].大气科学
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)
中文摘要:
      2018年1月3-7日和24-28日,我国南方地区出现了两次雨雪冰冻事件。利用台站观测资料和再分析资料,研究了它们的形成原因及其与冬季风异常的关系。结果表明,两次降水过程中,乌拉尔山地区有高压脊稳定维持,西风带多小波动活动,南支扰动活跃。受冷空气和南支槽等系统的影响,南方地区出现大范围降水、降雪。而这种稳定形势与平流层的环流特征有关系。1月平均的平流层极涡强度异常偏强,有利于低层环流的稳定。在1月份,南北不同纬带冬季风的强度有着显著的差别。大多数情况下呈现了不一致甚至相反的态势。南方雨雪冰冻天气往往发生在北方北风偏强、而南方南风偏强的时候。在季节尺度上,当冬季风呈现“北强南弱”的反相变化模态时,即北方北风、南方南风距平时,南方地区容易出现雨雪天气。
Abstract:
      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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