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气象:2013,39(4):427-435
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台风对四川暴雨影响的环境场对比分析
(四川省气象台,成都 610071)
Comparative Analysis on the Ambient Field of Torrential Rains Impacted by Typhoon in Sichuan
(Sichuan Provincial Meteorological Observatory, Chengdu 610071)
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投稿时间:2012-01-29    修订日期:2012-12-09
中文摘要: 通过统计2000—2010年5—9月在15°~35°N、103°~130°E区域内活动的台风与相应时段四川逐日降水量之间的关系,指出与四川暴雨统计关系最密切的台风路径分别为偏西路径、转向路径和西北路径。对比相似台风路径背景下四川有无明显暴雨出现的环境场特征,指出西风带低槽在40°N以北活动,中亚地区为高脊,中纬度大陆高压控制西藏东部到四川大部或我国中东部为宽广低槽是不利四川产生明显暴雨的环境场特征;巴尔克什湖到贝加尔湖为宽广低槽,副热带锋区密集,到达36°N附近,中纬度带状高压脊线位于30°N以南以及我国中高纬度呈现出东高西低的态势,西部为经向度大的斜压性低槽是有利四川产生暴雨的环境场特征。分析指出:台风对四川天气的影响主要有三方面,一是通过影响副热带高压(大陆高压)产生间接影响;二是台风低压外围环流直接影响;三是作为载体向四川输送暖湿空气,与中高纬低值系统及副热带高压相互作用共同影响。
Abstract:By working on the relations between the typhoons seen in the region of 15°-35°N and 103°-130°E from May to September, 2000-2010 and the daily precipitation amount in Sichuan in the corresponding period, this paper points out the typhoon tracks most closely related to the recorded torrential rains in Sichuan were the west track, shift track and northwest track. Comparing the ambient field of clearly seen heavy rains and not clearly seen heavy rains under the background of similar typhoon tracks, it is found that the westerlies trough was active to the north of 40°N, a high ridge was in the Central Asian region, the high pressure over the mid latitude continent controlled the area from eastern Tibetan Plateau to much of Sichuan or in the central and eastern part of China was a broad trough, which shows an unfavorable ambient field for the occurrence of obvious torrential rains in Sichuan. However, over the area between Balkhash Lake and Baikal Lake there was a broad low trough, subtropical fronts were dense and reached the area around 36°N, the mid latitude ribbon ridge line was found over the area to the south of 30°N, and moreover, the mid high latitudes in China presented a posture of east high and west low and the meridional baroclinic trough in West China was the ambient field, favorable for the breakout of rainstorms in Sichuan. The analysis results suggest that the impact of typhoons on the weather in Sichuan mainly include three aspects: the first is the indirect influence through affecting subtropical high, the second is the direct influence of the circulation in the outer area of low pressure of typhoon, and the third is that typhoon plays the role of a carrier to convey the warm and moist air to Sichuan region, interacting with the low value systems in mid high latitudes and subtropical high.
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基金项目:西南区域气象中心重大科研业务项目(2010 5)、公益性行业(气象)科研专项(GYHY200906001)、中国气象局预报员专项(CMAYBY2011 046)和川气课题 2010 青年 3共同资助
引用文本:
康岚,牛俊丽,徐琳娜,肖红茹,陈莹,2013.台风对四川暴雨影响的环境场对比分析[J].气象,39(4):427-435.
KANG Lan,NIU Junli,XU Linna,XIAO Hongru,CHEN Ying,2013.Comparative Analysis on the Ambient Field of Torrential Rains Impacted by Typhoon in Sichuan[J].Meteor Mon,39(4):427-435.