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气象:2015,41(9):1079-1085
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孟加拉湾风暴费林(1302)对藏南一次暴雪过程的影响分析
(1.中国气象科学研究院灾害天气国家重点实验室,北京 100081;2.国家气象中心,北京 100081;3.内蒙古大气探测技术保障中心,呼和浩特 010051)
Impact of Storm Phailin (1302) over the Bay of Bengal on One Snowstorm Process in Southern Tibetan Plateau
(1.State Key Laboratory of Severe Weather, Chinese Academy of Meteorological Sciences, Beijing 100081;2.National Meteorological Centre, Beijing 100081;3.Inner Mongolia Meteorological Observation and Support Centre, Hohhot 010051)
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投稿时间:2015-02-05    修订日期:2015-05-05
中文摘要: 利用中国气象局地面加密观测资料、日本气象厅卫星TBB资料和NCEP/NCAR 1°×1° FNL资料,对2013年10月发生在西藏南部(简称藏南)的一次暴雪天气过程进行分析,结果表明:(1)孟加拉湾风暴费林北上残余云系的影响是这次暴雪天气产生的重要原因。(2)不同于风暴与高原南侧南支槽结合产生影响的典型环流形势,“费林”与其东侧高压环流形成的偏南低空急流是其北上影响藏南的有利大气环流背景。(3)“费林”不仅通过偏南低空急流向藏南输送不稳定能量,而且通过自身强烈的抬升运动,为暴雪提供有利的动力和热力条件。(4)风暴与青藏高原西侧冷空气交汇产生的锋生以及青藏高原地形的强迫抬升,也加强了暴雪的动力条件。(5)这次暴雪过程的不稳定能量主要源于风暴的平流输送,藏南高海拔、干冷下垫面和低0℃层高度是暴雪持续发生的一个有利因素。
Abstract:Based on the NCEP/NCAR 1°×1° FNL data, satellite TBB data from Japan Meteorological Agency and dense surface observation data of China Meteorological Administration, this paper investigated a severe snow process in Southern Tibetan Plateau. The results show that (1) the snowstorm is mainly related to the impact from residual cloud systems of northward moving cyclonic storm phailin over the Bay of Bengal. (2) The southerly low level jet between the storm and high pressure circulation is beneficial to the northward movement of Storm phailin and its impact. (3) The cyclone provides unstable energy via southerly low level jet and the strong ascending airflows to Southern Tibetan Plateau, which creates favorable dynamic and thermodynamic conditions for the snowstrom. (4) The frontogenesis formed by the cold air from the westerly trough and warm air from the storm and the forced ascending caused by the terrain effect of Tibetan Plateau also enhance the dynamical conditions of snowstorm. (5) The unstable energy advection by the storm is the main energy source for the snowstorm. High elevation, dry and cold underlying surface and low 0℃ height over Southern Tibetan Plateau are important factors for the continuity of the snowstorm.
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基金项目:公益性行业(气象)科研专项(GYHY201406010和GYHY201106005)及国家自然科学基金项目(91215302、41275066和41175063)共同资助
引用文本:
柳龙生,李英,赵毅勇,2015.孟加拉湾风暴费林(1302)对藏南一次暴雪过程的影响分析[J].气象,41(9):1079-1085.
LIU Longsheng,LI Ying,ZHAO Yiyong,2015.Impact of Storm Phailin (1302) over the Bay of Bengal on One Snowstorm Process in Southern Tibetan Plateau[J].Meteor Mon,41(9):1079-1085.