NUMERICAL EXPERIMENTS ON THE IMPACTS

NUMERICAL EXPERIMENTS ON THE IMPACTS OF SEA SPRAY ON TROPICAL CYCLONES

The latest version of sea spray flux parameterization scheme developed by Andreas is coupled with the PSU/NCAR model MM5 in this paper. A western Pacific tropical cyclone named Nabi in 2005 is simulated using this coupled air-sea spray modeling system to study the impacts of sea spray evaporation on the evolution ot" tropical cyclones. The results demonstrate that sea spray can lead to a significant increase of heat fluxes in the air-sea interface,especially the latent heat flux. the maximum of which can increase by up to about 35% - 80% The latent heat flux seems to be more important than the sensible heat flux for the evolution of tropical cyclones. Regardless of whether sea spray fluxes have been considered,the model can always simulate the track of Nabi well,which seems to indicate that sea spray has little impact on the movement of tropical cyclones. However,with sea spray fluxes taken into account in the model,the intensity of a simulated tropical cyclone can have significant increase. Due to the enhancement of water vapor and heat from the sea surface to the air caused by sea spray,the warm core structure is better-defined,the minimum sea level pressure decreases and the vertical speed is stronger around the eye in the experiments,which is propitious to the development and evolution of tropical cyclones.

作 者： ZHENG Jing FEI Jian-fang WANG Yuan HUANG Xiao-gang LI Qi-ming WU Hong-yi   作者单位： ZHENG Jing(Institute of Meteorology,PLA University of Science & Technology,Nanjing 211101 China;Post No.76,PLA Troops 73061,Xuzhou 221008 China)

FEI Jian-fang(Institute of Meteorology,PLA University of Science & Technology,Nanjing 211101 China;Meteorology Observatory of PLA Navy 91774,Shanghai 200083 China)

WANG Yuan,LI Qi-ming,WU Hong-yi(Meteorology Observatory of PLA Navy 91774,Shanghai 200083 China)

HUANG Xiao-gang(Institute of Meteorology,PLA University of Science & Technology,Nanjing 211101 China) 

刊 名： 热带气象学报(英文版)  英文刊名： JOURNAL OF TROPICAL METEOROLOGY  年，卷(期)： 2009 15(1)  分类号： P444  关键词： numerical simulation   tropical cyclone   sea spray   parameterization scheme