2004年台风“蒲公英”引起吕宋海峡海洋上层输运异常分析

Analysis of the Luzon Strait transport anomalies caused by typhoon “Dandelion” in 2004

基于海洋同化数据产品HYCOM以及遥感风场数据,分析了2004年台风"蒲公英"经过吕宋海峡期间,诱发的吕宋海峡体积输运异常。分析发现该台风经过吕宋海峡期间在海峡附近形成了强烈的北风异常,诱导了一支从西太流向南海的纬向流,从而在吕宋海峡内激发出强烈的西向输运异常。进一步诊断发现,该异常输运基本局限在上50 m层,并且是通过Ekman输运过程来诱发的吕宋海峡体积输运异常。

Based on the ocean assimilation data HYCOM (The HYbrid Coordinate Ocean Model) and the remote sensing wind data products, the upper Luzon strait volume transport anomalies (LSTa) induced by typhoon “Dandelion”have been analyzed. The path of typhoon“Dandelion”is almost parallel to the Luzon strait, and significant LSTa is triggered during its passing by. It is found that strong northerly anomalies exit and thus significant negative (flow into South China Sea) LSTa is induced under the Ekman transport. Further analysis shows that the LSTa is limited on the upper 50 m which is consistent with Ekman theory.