台风“布拉万”过境黄海时的异常增温事件研究  

An abnormal sea surface warming event as Typhoon Bolaven passes the Yellow Sea

作　　者：柴霞 梁湘三 赵远冰[2] 吴辉 王一鹤[3] Chai Xia;Liang Xiangsan;Zhao Yuanbing;Wu Hui;Wang Yihe(School of Marine Sciences,Nanjing University of Information Science and Technology,Nanjing 210044,China;School of Atmospheric Sciences,Nanjing University of Information Science and Technology,Nanjing 210044,China;State Key Laboratory of Estuarine and Coastal Research,East China Normal University,Shanghai 200241,China)

机构地区：[1]南京信息工程大学海洋科学学院,江苏南京210044 [2]南京信息工程大学大气科学学院,江苏南京210044 [3]华东师范大学河口海岸学国家重点实验室,上海200241

出　　处：《海洋学报》2020年第7期41-50,共10页

基　　金：国家自然科学基金面上项目(41975064,41576088,41776101);国家海洋专项“全球变化和海气相互作用”(GASI-IPOVAI-06);2015年江苏省双创计划团队项目。

摘　　要：海洋对台风的响应通常表现为海表温度的降低,然而,出现在2012年8月的台风“布拉万”在经过黄海时却引起朝鲜半岛木浦沿岸海域海表的增温(而非降温),且增温幅度达4.2℃。本研究详细分析了此次异常事件的时空特征,并探讨了其可能的成因。结果发现,此次事件的产生和黄海表层冷水斑块(Surface Cold Patch,SCP)存在密切关系,并恰好出现在木浦SCP所在位置。上升流和潮混合是木浦SCP的两大形成机制,此次增温事件主要是台风“布拉万”通过抑制其生成机制之一的上升流而导致降温不足之故。具体而言,台风“布拉万”过境时位于木浦SCP的左侧,其上的北向风应力带来向岸的Ekman输运,造成外围暖水在木浦SCP地区堆积,从而抑制了该地区原本的上升流(甚至变为下降流)。The ocean response to typhoon is usually characterized by a cooling on the sea surface.In August 2012,however,a warming(instead of cooling)event occurs in the Yellow Sea outside Mokpo,South Korea,as the typhoon Bolaven(2012)passes.This study gives a report of this abnormal sea surface warming,and provides an exploration of the underlying dynamical processes.It is found that the event coincides in location with the Yellow Sea Surface Cold Patch(SCP)outside Mokpo;Typhoon Bolaven(2012)suppresses the surface cooling due to SCP and hence leads to the abnormal warming.Of the two basic mechanisms that account for the formation of SCPs,i.e.,tidal mixing and upwelling,the latter shows a drastic response to the typhoon passage−the upwelling is turned into a downwelling.The downwelling arises from the onshore Ekman transport generated by the northward wind stress on the left hand side of the Mokpo SCP.

关 键 词：台风 表层冷水斑块 黄海 海洋响应 上升流 海气相互作用 

分 类 号：P731.11[天文地球—海洋科学]