| 台风“尤特”登陆后复杂路径的环境场特征 |
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| 引用本文：覃武，罗小莉，钟利华，林宗桂，林开平，林墨.台风“尤特”登陆后复杂路径的环境场特征[J].气象与环境科学,2019,42(1):110-118.Qin Wu,Luo Xiaoli,Zhong Lihua,Lin Zonggui,Lin Kaiping，Lin Mo.Environment Field Features on the Complex Path After Landing of Typhoon “UTOR”[J].Meteorological and Environmental Sciences,2019,42(1):110-118. |
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| DOI：doi:10.16765/j.cnki.1673-7148.2019.01.015 |
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| 中文摘要:台风“尤特”（1311）2013年8月1319日登陆减弱后直达桂东北并停留打转，其后又转向西南移动，“尤特”残涡在广西境内生存活动了112 h，造成了大范围强降雨。使用常规与非常规观测资料，研究了“尤特”登陆后的环境场与其长生命期及复杂移动路径的关系。结果发现：“尤特”登陆北上阶段主要受大尺度环境场的引导气流主导，后因引导气流转向减弱，与变压梯度力近似达到平衡导致停留打转；南下弱冷空气卷入与西南气流辐合形成负变压槽，负变压槽中风向气旋性切变产生正涡度效应向“尤特”残涡输送，与西南气流充沛的水汽输送共同作用使“尤特”残涡得以长时间维持。弱冷空气卷入使中尺度变压场中的正变压加强，在变压梯度力与引导气流共同作用下，“尤特”残涡沿负变压槽向西南移动。 |
| 中文关键词:登陆台风 路径 环境场 引导气流 中尺度变压场 |
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| Environment Field Features on the Complex Path After Landing of Typhoon “UTOR” |
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| Abstract:The typhoon UTOR (1311) first moved to northeast of Guangxi after its landing and then looped in the area before turn southwest after landing during 1319 August 2013,with the characteristic of long term life cycle of its residual vortex about 112 hours,caused widespread heavy rainstorm during its stay in Guangxi.The relationship between environment field,long term life cycle and complex track after its landing were analyzed based on the conventional and non conventional observational data.The results showed that during the northward period,UTOR was mainly leaded by large scale environmental steering flow and then UTOR looped in the northeast of Guangxi while the steering flow approximately balanced the variable pressure gradient force after its shifted and became weaker.Long term life cycle of the residual vortex of UTOR was because of the positive vorticity advection that produced by the wind shear line of the negative pressure trough which was generated by the convergence between southward cold air and southwest air current.The meso scale allobaric field became stronger after the weak cold air involved,the interaction of gradient force and upper steering flow lead to the southwest shift of UTOR. |
| Keywords:landing typhoon path environment field steering airflow meso scale allobaric field |
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