斜压大气中环流非对称结构与台风移速关系的数值研究

A NUMERICAL STUDY ON THE RELATIONSHIP BETWEEN THE ASYMMETRIC STRUCTURE AND MOVING VELOCITY OF TYPHOON IN BAROCLINIC ATMOSPHERE

采用４层准地转斜压模式，在无环境气流的情况下，进行了两次数值试验，研究了台风环流不同方位、不同半径处的非对称程度与其中心移速的关系，以及不同层次台风环流的非对称结构与台风移速的相关性。结果表明：（１）距台风环流中心１００～３００ｋｍ的东一西向和东北一西南向非对称程度与其东西向移速有稳定的强负相关，２００～５００ｋｍ的东南一西北向非对称程度与其南北向移速有稳定的强正相关。（２）模式最下层环流的非对称结构与台风移速的关系最密切。在该层，距中心１００～４００ｋｍ的东一西向和东北一西南向非对称程度与台风沿东西向移速密切相关，１００ｋｍ以外的东南一西北向非对称程度与台风沿南北向移速密切相关。

A quasi-geostrophic baroclinic model is used to study the correlation between the asymmetric structure and moving velocity of typhoon. Results show that: 1) the moving velocityof typhoon in west-east direction is negatively interrelated to the asymmetry in west-east andsouthwest-northeast direction at a distance of 100 km to 300 km away from typhoon center.while the moving velocity in north-south direction has a strong positive relatinship with theasymmetry in northwest-southeast direction at a distance of 200 km to 500 km away fromthe center: 2) asymmetry of the lowest level circulation is the highest correlated totyphoon's moving velocity.