摘要
对具有偏北移动分量的东海热带气旋路径折向时的环境环流的参数变化、动力结构及涡度收支等合成分析表明:当热带气旋环境环流的总变化为东风分量增大或由于动力变化产生向左的合力或涡度变化使热带气旋强度减弱时将导致热带气旋移动路径左折;当环境环流总变化为西风分量增大或动力变化产生向右的合力或涡度变化使热带气旋强度增强时将导致移动路径右折;当合力状况少变,涡度变化不足以改变热带气旋强度时,内力与环境外力平衡维持,热带气旋的移动路径不发生折向.
The effect of surrounding flow on the unusual motion of tropical cyclones in East China Sea is studied by analyzing the environmental parameter change, dynamic structure, and vorticity budget. The results indicate that the tropical cyclone is to move unusually leftward (rightward) on condition that the easterly (westerly) component of surrounding flow increases, or the intensity of tropical cyclone decreases (increases) due to dynamic change of surrounding flow, which implies that the easterly (westerly) component of basic flow intensifies relatively. The tropical cyclone is to move forward along a nearly constant direction if the surrounding flow is in dynamic equilibrium,or the intensity of tropical cyclone shows little change.
出处
《浙江大学学报（理学版）》
CAS
CSCD
北大核心
2005年第3期343-349,共7页
Journal of Zhejiang University（Science Edition）
基金
台风研究基金资助项目
关键词
环境环流
影响
热带气旋
路径折向
surrounding flow
effect
tropical cyclone
unusual motion
