台风“达维”对“苏拉”的影响分析

作者：范爱芬  娄小芬  彭霞云  陈列

单位：浙江省气象台, 浙江杭州 310017

关键词：双台风互旋 非对称结构 降水分布异常

分类号：P444

出版年·卷·期（页码）：2014·31·第二期（26-34）

摘要：

1209号台风“苏拉”生成后,长时间移动缓慢,路径北偏西,但移动过程复杂。位于其东北方向的1210号台风“达维”的活动给“苏拉”的业务预报带来了较大不确定性。当“达维”快速移动后,与其间距小于1000 km达1.5 d,期间双台风互旋不明显。但“达维”的近距离存在,不仅改变了“苏拉”的环境基本引导气流,还改变了“苏拉”的水汽输送、强度变化和结构特征,使“苏拉”的后期路径转向西北,移速加快一倍;登陆福建前后出现非对称结构和降水异常分布;其降雨特点与无双台风影响的相似路径台风“海棠”和“碧利斯”有巨大差异。本文应用卫星云图、新一代天气雷达资料、NCEP1°×1°再分析资料和常规气象资料,着重分析“达维”对“苏拉”的路径和降水影响。

1209 Typhoon"Saola"moved slowly for a long time and had the total track of north by west with complex moving processes. The activity of 1210 typhoon"Damery"on the northeast of" Saola"brought much uncertainty to the operational forecast of"Saola". After the faster movement of"Darmery", the distance between "Saola"and"Damery"is less than 10 latitude distance for 1.5 days when the mutual rotation of binary typhoons is not obvious. However, the close existence of"Damery"has changed the basic steering flow, the water vapor transportation, the intensity variation and the structural feature of"Saola". As a result, both the moving direction and velocity of"Saola"have changed during the later period and"Saola"shows an asymmetric structure and abnormal rainfall distributions during landfall at Fujian province. Its precipitation characteristics are significantly different from the similar track typhoons"Haitang"and"Billis"without binary typhoons. The study focuses on analyzing the influences the"Darmery"on the track and precipitation of"Saola"by using satellite and radar data, NCEP1°×1° re-analyses data and routine meteorological data.

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