Modeled Oceanic Response and Sea Surface Cooling to Typhoon Kai-Tak

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Title:	Modeled Oceanic Response and Sea Surface Cooling to Typhoon Kai-Tak
Authors:	Tseng,YH;Jan,S;Dietrich,DE;Lin,II;Chang,YT;Tang,TY
Contributors:	水文與海洋科學研究所
Date:	2010
Issue Date:	2012-03-27 17:33:10 (UTC+8)
Publisher:	國立中央大學
Abstract:	An ocean response to typhoon Kai-Tak is simulated using an accurate fourth-order, basin-scale ocean model. The surface winds of typhoon Kai-Tak were obtained from QuikSCAT satellite images blended with the ECMWF wind fields. An intense nonlinear mesoscale eddy is generated in the northeast South China Sea (SCS) with a Rossby number of O(1) and on a 50 - 100 km horizontal scale. Inertial oscillation is clearly observed. Advection dominates as a strong wind shear drives the mixed layer flows outward, away from the typhoon center, thus forcing upwelling from deep levels with a high upwelling velocity (>30 m day(-1)). A drop in sea surface temperature (SST) of more than 9 degrees C is found in both observation and simulation. We attribute this significant SST drop to the influence of the slow moving typhoon, initial stratification and bathymetry-induced upwelling in the northeast of the SCS where the typhoon hovered.
Relation:	TERRESTRIAL ATMOSPHERIC AND OCEANIC SCIENCES
Appears in Collections:	[Graduate Institute of Hydrological and Oceanic Sciences] journal & Dissertation

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