摘要
2011年9月14日—10月5日,"纳沙"和"尼格"2个台风先后登陆海南,均产生了较强的区域性暴雨或大暴雨。利用常规资料,对这2个台风的移动路径和暴雨形成机制进行了对比分析。分析结果表明,台风登陆后,由于副高形态及其演变的不同,使得两个台风路径变化不同。利用0.5°×0.5°NCEP全球再分析资料和常规气象要素、中尺度自动站和日本静止卫星0.05°×0.05°TBB等资料,综合分析登陆台风"纳沙"、"尼格"强度和结构差异对海南暴雨分布的影响。结果表明:台风中心附近环境风垂直切变密集带的跨度变化与台风强度相关,日平均海表温度与热带气旋(TC)强度维持或加强密切相关;登陆TC动力结构和水汽辐合的不对称分布导致台风暴雨落区和强度存在显著差异,强降水与局地发生的对流云对应较好时表现为明显的对流性降水,对降水有增幅作用。
Based on NECP global reanalysis data（0. 5°× 0. 5°）, conventional meteorological data, automatic weather sta- tions data, Japan stationary satellite TBB data（0. 05° × 0. 05°）, etc, the effects of intensity and structure differences between landing Typhoons ＂NESAT＂ and ＂NALGAE＂ on the distribution of rainstorm in Hainan island have been studied. The results show ： 1. The intensity of the typhoons is related to the span change in the intensive zone of vertical wind shear around the cen- ter, and the average daily sea surface temperature is closely related to their remaining steady or intensifying; 2. To landing ty- phoons, the dynamical structure and the asymmetric distribution of moisture convergence lead to significant differences in rain- storm area and intensity, and in this work, when rainstorm matches well with local convective cloud, the rainfall is classified as convective precipitation（which has amplifying effect to rainfall）, otherwise, it is considered as stratocumulus precipitation.
出处
《广东气象》
2013年第2期14-20,共7页
Guangdong Meteorology
基金
国家科技支撑项目(2013BAK05B03)
2012年中国气象局预报员专项项目(CMAYBY 2012-047)共同支助
