摘要
利用常规观测资料和NCEP 1°×1°格点资料,从能量场、湿度场、辐散场以及西南季风和越赤道气流等多方面对"珍珠"的强度及路径进行分析,发现副高前期在南海的维持以及副高后期环流形势的调整是"珍珠"强度维持和路径突变的关键;南海海域维持高能区、弱水平风垂直切变、对流层上层强大的辐散场、以及充沛的水汽供应、风场动力非对称结构等是"珍珠"强度能维持的重要原因;西南季风、越赤道气流和副高南落而引发的东南风急流形成的季风汇合线是"珍珠"北翘的直接原因.台风风场结构中不对称强风速区的转移对台风路径改变有预示作用.
0601 typhoon ＂Chanehu＂, with the peculiarity of early appearance, strong intensity, widely infection, unearthly track, and so on, is the first typhoon landing and affecting Guangdong Province in the year of 2006. The difficulty for the forecasting is that the intensity of ＂Chanchu＂ could maintain and strengthen and the center of ＂Chanehu＂ made a north turn at an 90 angle in the middle of South China Sea. Using the conventional observation data NCEP 1°×1°grid data, the intensity and track of typhoon are analyzed from the energy field, moisture field, divergence field and cross-equatorial flow in this paper. It is found that the early maintain and the evening circumfluence adjusting of subtropical high in South China Sea is the key that why the ＂Chanchu＂ had maintained the intensity and had a sharply variational track. The high energy area, weak vertical wind shear, the strong dirvergence in upper troposphere, the abundance moisture and asymmetric dynamic structure of wind field are importance reasons for the maintaining of typhoon intensity. And the direct reason for north turning of typhoon is monsoon convergence belt causing by southwest monsoon, cross-equatorial flow and southeast wind jet forming by the moving southward of subtropical high. The transfer of asymmetric strong wind area in the wind field of typhoon indicates the change of typhoon track.
出处
《台湾海峡》
CAS
CSCD
北大核心
2008年第1期124-128,共5页
Journal of Oceanography In Taiwan Strait
关键词
气象学
弱水平风垂直切变
不对称强风速区
转移
季风汇合线
“珍珠”台风
meteorology
weak vertical wind shear
asymmetric strong wind-area
transfer monsoon convergence belt
typhoon ＂Chanchu＂
