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在常规气象资料分析的基础上，结合9802号热带气旋环境场的物理诊断和卫星云图，分析了台湾海峡地形性低压的形成以及9802号热带气旋次级环流对地形性低压的诱生加强作用，并探讨了9802号热带气旋移动路径偏折的原因。着重指出台湾海峡诱生低压引起9802号热带气旋翻越台湾岛过程中路径左偏和两低涡合并加强引起路径右折及其可能机制。“,”The formation of the orthographic depression in the Taiwan Straits and the effect of the secondary circulation of Typhoon No.9802 on the depression are studied using conventional data analysis and satellite images.The factors determining the path of Typhoon No.9802 are also discussed.Results indicate that the Taiwan Straits depression favored Typhoon No.9802 and caused it′s deviation left when moving over Taiwan lsland.