台风“利奇马”(1909)双眼墙结构的多源观测数据分析

Multi-source observation data analysis of the concentric eyewalls structure of Typhoon“Lekima”(1909)

利用CIMSS/MIMIC资料、雷达资料、国家气象中心台风定位定强资料,通过集成微波图像判断台风双眼墙形成,分析"利奇马"长达33. 5 h的双眼墙结构特征。结果表明:(1)受宫古岛附近岛屿地形影响和螺旋环流结构调整,内外眼墙对流出现两次偏移;(2)当台风强度较强且稳定时,内眼墙环流的偏移不会引起台风强度的变化,反而因台风强度稳定使内眼墙环流重新组织;(3)雷达回波显示内眼墙有3 h周期的生消发展过程,非对称摩擦效应决定了内外眼墙之间的对流交换主要发生在moat区西北部。

Based on CIMSS/MIMIC data,Taizhou radar data and typhoon location and intensity determination data of the National Meteorological Center,this paper analyzes the structural characteristics of the concentric eyewalls of Typhoon“Lekima”(1909)for 33.5 hours.The results are as follows:(1)The convection has exchanged twice between inner and outer eyewalls due to the topography when“Lekima”passed near Miyako Island or the adjustment of its spiral structure.(2)When the intensity of typhoon is strong and stable,the deviation of typhoon s inner eyewall circulation will not cause the change of typhoon s intensity.On the contrary,the stability of typhoon s intensity makes the inner eyewall circulation be reorganized and developed again,and the structure of the concentric eyewalls develops steadily.(3)Radar echoes show the inner eye wall has a 3-hour period of formation and disappearing.The asymmetric friction effect determines that the convective exchange between the inner and outer eyewalls mainly occurs in the northwest of the moat region.