Importance of pre-existing oceanic conditions to upper ocean response induced by Super Typhoon Hai-Tang

This study investigates upper ocean response to Super Typhoon Hai-Tang, the most intense typhoon in 2005, in the western North Pacific using multi-satellite microwave data, typhoon data and Argo profiles. Sequential merged microwave sea surface temperature (SST) images show that Hai-Tang induced four separately cooling responses after its trail in the western North Pacific during 11-18 July. Comparison between upper ocean responses of cooling SST and pre-typhoon sea surface height suggests that these cooling responses of the upper ocean to Hai-Tang are closely associated with pre-existing cyclonic circulation denoted by pre-existing negative sea surface features. Furthermore, applying Argo profiles, the physical mechanism is confirmed to be associated with pre-existing cyclonic circulations provide a relatively unstable thermodynamic structure, and therefore cold water would be brought up readily. This paper provides the rather convincing evidence that cyclonic flow and uplifted thermocline are the pre-existing conditions for intensive cooling following the typhoon passage. Citation: Zheng, Z.-W., C.-R. Ho, and N.-J. Kuo (2008), Importance of pre-existing oceanic conditions to upper ocean response induced by Super Typhoon Hai-Tang, Geophys. Res. Lett., 35, L20603, doi: 10.1029/2008GL035524.