2021年“卢碧”台风异常降水原因分析——以福州地区为例

Cause Analysis of Abnormal Precipitation of Typhoon“Lubi”in 2021——Take Fuzhou as an Example

利用EC再分析资料和常规自动站资料,对202109号台风“卢碧”路径特征和环境场形势、物理量场进行诊断分析。结果表明,近海生成的“卢碧”具有强度较弱、移速缓慢、降水量大、维持时间长的特点;副高南退,低层西南气流引导和10号台风“银河”的牵引作用,“卢碧”移动路径以东北方向为主;登陆福建南部后的滞留时间长,其东北侧螺旋雨带造成福建中部沿海大暴雨到特大暴雨;高层强辐散低层辐合提供强烈动力抬升条件,强水汽通量辐合中心与大暴雨特大暴雨区吻合;喇叭口地形对降水有一定增幅作用。

Using EC reanalysis data and conventional automatic station data,the path characteristics,environmental field situation and physical quantity field of 202109Typhoon“Lubi”were analyzed.The results showed that“Lubi”generated offshore has the characteristics of weak strength,slow moving speed,large precipitation and long maintenance time.The subtropical high retreated southward,the low-level southwest airflow was guided and the No.10 Typhoon“Yinhe”was pulled.The moving path of“Lubi”was mainly northeast.It landed in southern Fujian and remained there for a long time.The spiral rain belt on its northeast side caused heavy rain to extremely heavy rain in central coastal areas of Fujian.Strong divergence at the upper level and convergence at the lower level provided strong dynamic uplifting conditions.The convergence center of strong water vapor flux coincided with the heavy rain area.Trumpet mouth topography had a certain effect on precipitation increase.