摘要
利用NCEP/NCAR再分析资料,研究在台风"麦德姆"登陆北上过程中对其产生重要影响的高空槽的位置、强度、槽上暖中心的变化,且对槽进行了涡度方程的诊断分析。结果表明,高空槽向东移动的过程中有暖中心与之配合,致使高空槽强度不断增加。散度项、平流项和地转平流项对涡度的局地变化贡献较大,主要的正贡献来源于散度项。高空槽达到最强时,"麦德姆"低压环流和高空槽结合,受高空槽前部显著辐散场的影响,台风高层辐散、中心附近上升运动明显增强,这是台风"麦德姆"登陆后期强度得以维持的重要因素。
The location,the intensification and the warm core of the upper level trough were analyzed during Matmo moving northward after landfall by using NCEP/NCAR data. The method of vorticity equation was adopted to diagnose the upper level trough. Results showed that the upper level trough gradually strengthened affected by the warm core while moving eastward. The horizontal advection term, the divergence term and thegeostrophy term of the vorticity equation were the main dynamic conditions. And the divergence term made the positive contribution. The stronger divergence field in the front Of the upper trough caused high-level divergence and vertical motion of Matom,which play the major role of Matmo sustaining for a long period after landfall.
出处
《安徽农业科学》
CAS
2017年第5期189-192,共4页
Journal of Anhui Agricultural Sciences
关键词
高空槽
“麦德姆”
涡度方程
暖中心
辐散场
Upper level trough
Matmo
Vorticity equation
Warm core
Divergence field
