周围环境场对台风生成的影响
投稿时间: 2014-01-12  最后修改时间: 2014-01-12  点此下载全文
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作者单位E-mail
张月萌 南京信息工程大学 121233786@qq.com 
基金项目:国家重点基础研究发展计划(973计划)
中文摘要:本文利用NCEP/NCAR水平分辨率为1白1?、逐6小时的分析资料,以及JTWC最佳TC路径资料,对2004~2010年5~9月北半球100皛180癊范围内,118例TC生成时刻周围系统辐散风的大小以及时间和空间分布特征进行了统计分析,根据作用系统的不同将台风分为7种类型,其中1)越赤道气流型;2)越赤道气流和副高相当型;3)越赤道气流强,副高弱型;4)副高型;这4种型最多,占总数的91.5%以上。以台风为中心,在新生台风闭合环流外500公里范围内,第I象限为副高的影响,在第II象限多为副高与大陆高压影响,第III象限为越赤道气流影响,而在第IV象限多为越赤道气流影响,少数为副高影响。区域平均越赤道气流辐散风的影响强度在1.4~3.5m?s-1的范围内,副高辐散风的影响强度在0.7~1.2m?s-1的范围内。对0704号的控制试验和敏感性试验得出,去掉台风自身的作用后,仍然会在一段时间后生成新的台风,这也验证了周围系统对台风的生成有重要的作用。
中文关键词:台风  辐散风  越赤道气流  副高
 
The Effect of Surrounding Environment Fields on Typhoon Genesis
Abstract:Based on NCEP/NCAR 1白1?gridded analyses data per 6 hours and the best track data from JTWC, the temporal and spatial distribution as well as the value of the divergent wind surrounding 118 tropical cyclones in the range of 100癊 to 180癊 in the northern hemisphere from May to September in 2004 to 2010 was statistically analyzed. Typhoons can be divided into seven types according to different influence systems, and the first four categories take more than 91.5% of the total number, which are 1) cross-equatorial flow type;2) cross-equatorial flow and subtropical high equal type;3) strong cross-equatorial flow and weak subtropical high type;4) subtropical high type. Centered on typhoon, within 500 kilometers away from the closed vortex of the new typhoons is affected by subtropical high in the first quadrant, subtropical high and continental high in the second quadrant, cross-equatorial flow in the third quadrant and the fourth quadrant is mostly affected by cross-equatorial flow and seldom affected by subtropical high. As for the regional average divergent wind values, the effect intensity of cross-equatorial flow varies in the range of 1.4~3.5m?s-1 and the effect intensity of subtropical high varies in the range of 0.7~1.2m?s-1. By conducting both the control test and sensitivity test on typhoon 0704 we know that another new typhoon will still generate in few days after removing the typhoon, which also proves the surrounding systems play an important role in typhoon genesis.
keywords:typhoon  divergent wind  cross-equatorial flow  subtropical high
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