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The Impact of the Storm-Induced SST Cooling on Hurricane Intensity

The Impact of the Storm-Induced SST Cooling on Hurricane Intensity

作     者:Tong ZHU Da-Lin ZHANG 

作者机构:CIRA/CSU at NOAA/NESDIS/ORA Camp Springs MD 20746 USA Department of Meteorology University of Maryland College Park MD 20742 USA 

出 版 物:《Advances in Atmospheric Sciences》 (大气科学进展(英文版))

年 卷 期:2006年第23卷第1期

页      面:14-22页

核心收录:

学科分类:07[理学] 070601[理学-气象学] 0706[理学-大气科学] 

基  金:NASA(NAG-510746) NSF(ATM-0342363) ONR of USA(N000140210402) CIRA/Colorado State University 

主  题:SST feedback hurricane intensity numerical modeling 

摘      要:The effects of storm-induced sea surface temperature (SST) cooling on hurricane intensity are investigated using a 5-day cloud-resolving simulation of Hurricane Bonnie (1998). Two sensitivity simulations are performed in which the storm-induced cooling is either ignored or shifted close to the modeled storm track. Results show marked sensitivity of the model-simulated storm intensity to the magnitude and relative position with respect to the hurricane track. It is shown that incorporation of the storm-induced cooling, with an average value of 1.3℃, causes a 25-hPa weakening of the hurricane, which is about 20 hPa per 1℃ change in SST. Shifting the SST cooling close to the storm track generates the weakest storm, accounting for about 47% reduction in the storm intensity. It is found that the storm intensity changes are well correlated with the air-sea temperature difference. The results have important implications for the use of coupled hurricane-ocean models for numerical prediction of tropical cyclones.

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