西北太平洋风场对台风路径的影响

本文着眼于西北太平洋对流层的风场，分析了西北太平洋环境流场对台风路径的影响。所研究的七类正常台风路径，副热带高压的反气旋环流是它们的直接影响系统。西风环流，尤其是中、高纬度高层西风的分布及其变化对于形成不同类型的台风路径亦起了很重要的作用。分析还发现，台风有沿着对流层深层暖区轴线，按照热成风方向移动的趋势。

The Effects of Flow Patterns over the Northwest Pacific on Typhoon Tracks

Based on the analysis of wind field in the troposphere over the Northwest Pacific, the effects of the environmental flow—patterns on typhoon tracks have been examined. For seven categories of normal tracks of typhoons, the anticyclonic circulation of the subtropical high over the Northwest Pacific is believed to be the key circulation feature directly affecting the typhoon tracks. The circulation features in the westerlies, especially, distribution and variation of the upper–level westerlies play an important role in controlling the different tracks. The analysis further indicates that typhoons tend to move along the axis line of warm area of deep tropospheric layer in the direction of the thermal wind.