- 11 - http://www.j-es.org/ Scientific Journal of Earth Science Month 2013, Volume *, Issue *, PP.11-18 Study on the Reason of Freezing Rain and Snow Storm Disaster over Middle and Lower Reaches of Yangtze River and South China during 2008 Yanyan Xu 1 , Jiahua Zhang #1 , Liping Li 2 , Hai Zhi 2 1. Chinese Academy of Meteorological Sciences, Beijing 100081, China 2. The Department of Atmospheric Science, Nanjing University of Information Science and Technology, Nanjing 21044, China Abstract Freezing rain is a weather phenomenon in early winter or end of winter/ beginning of spring. When strong cold air southward confronts with a warm and moist air, cold air inserts below the warm air, and near-surface air temperatures declines abruptly to below 0 ° C (but not too low), warm and moist air is upraised and give rise to rain or snow. In mid-January to early February 2008, large-scale of middle and lower reaches of Yangtze River and South China region experienced a process of continuous rain and snow. In this paper, after analyzing physical fields of the second process, there are several reasons for the formation of freezing rain disaster are found: (1) The basic condition for freezing rain occurrence: provision of water vapor. (2) An important condition for freezing rain occurrence: the strong upward motion. (3) The favorable conditions for freezing rain occurrence: the conditions of the existence of temperature inversion, and warm with the nose and is conducive to the emergence of freezing rain. (4) The supplement condition for freezing rain occurrence: moisture atmosphere frontogenesis. Because of cloud physics, micro- meteorology and many other effects of the distribution of freezing rain with some areas of local nature, and therefore, accurate prediction of its need for more research. Keywords: Snow Disaster; Freezing Rain; Physical Field; Temperature Inversion Layer; Middle and Lower Reaches of Yangtze River and South China 2008 年长江中下游及华南冰雪冻雨灾害成因分析 * 徐岩岩 1 ,张佳华 1 ,李丽平 2 ,智海 2 1.中国气象科学研究院,北京 100081 2.南京信息工程大学 大气科学系,江苏 南京 210044 摘 要:2008 年 1 月中旬至 2 月初,我国长江中下游及华南地区出现大范围持续性雨雪天气过程。本文通过对第二次过 程 1 月 18~21 日物理场的研究,分析得出了此次冻雨灾害形成的几个重要条件:(1) 冻雨出现的基础条件:充足的水汽。 (2)冻雨出现的重要条件:强烈的上升运动。(3)冻雨出现的有利条件:条件存在逆温层,并有暖鼻的配合,有利于冻 雨的出现。(4)冻雨出现的补充条件:湿大气锋生过程。由于涉及云物理、微气象学等诸多影响,冻雨区的分布带有一 定的局地性特征,因而,对其精确预报尚需作更多的研究。 关键词:冰雪灾害;冻雨;物理场;逆温层;长江中下游及华南 引言 2008 年 1 月中旬至 2 月初,我国长江中下游及华南地区出现 50 年一遇(部分地区百年一遇)的大范围 * 基金项目:全球变化研究国家重大科学研究计划课题(No.2010CB951302); 公益类行业(气象)专项(GYHY201106027),中国气象 科学研究院创新经费资助.
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Study on the Reason of Freezing Rain and Snow Storm Disaster over Middle and ……
Freezing rain is a weather phenomenon in early winter or end of winter/ beginning of spring. When strong cold air southward confronts with a warm and moist air, cold air inserts below the warm air, and near-surface air temperatures declines abruptly to below 0 ° C (but not too low), warm and moist air is upraised and give rise to rain or snow. In mid-January to early February 2008, large-scale of middle and lower reaches of Yangtze River and South China region experienced a process of continuous rain and snow. In this paper, after analyzing physical fields of the second process, there are several reasons for the formation of freezing rain disaster are found: (1) The basic condition for freezing rain occurrence: provision of water vapor.……
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