近海海温对再入海台风数值模拟影响的研究

doi:10.11978/j.issn.1009-5470.2012.05.016

Abstract

Abstract: We simulate the return to the sea of Typhoon Wipha (No.0713) using the weather research forecasting (WRF) model, by considering influences of different sea surface temperature (SST) fields that change or unchange with time during typhoon lifetime. We emphasize the responses to the SST fields, of thermodynamic factors, which are two microphysics schemes of LIN (Purdue Lin scheme) and WSM6 (WRF single-moment 6-class scheme) in the model, and of dynamic factor, which is Typhoon BOGUS scheme in the model. Furthermore, we investigate the impacts from thermodynamic factors, dynamic factors, and SST fields respectively and the combined impacts of the factors on the simulated typhoon track and intensity. The results from a set of experiments show that when SST changes with time we can obtain better diagnosis and simulation of air-sea interaction in typhoon area, and improve the prediction of typhoon’s track and intensity. For the simulation of Typhoon Wipha, the WSM6 scheme is more suitable than the LIN scheme, according to a number of model output variables, including typhoon track, central air pressure, the biggest wind speed, sensible heat flux and latent heat flux, at the stages of landfall and return to the sea. The Typhoon BOGUS scheme gives an obvious improvement on typhoon track simulation. During the stage of typhoon return to the sea, the simulated sensible heat flux and latent heat flux distributions show that the positive high value areas of sensible heat flux provide energy to typhoon and indicate its future track in advance. The high value area of latent heat flux is located at the typhoon wind convergence and strengthening area. The high latent heat flux in the typhoon system structure contributes to maintain the typhoon activity of return to the sea. To use the SST field that changes with time in the typhoon simulation is of benefit to the improvement of prediction, and the 6h SST gives a better result than daily averaged SST.

Key words: typhoon reentrance sea, SST, WRF microphysics scheme, typhoon BOGUS scheme

CLC Number:

P732

WANG Jian-hong,SHAO Cai-xia,MIAO Chun-sheng,ZHONG Qing,WU Yun-rong. Near-shore SST’s impact on typhoon return to the sea in numerical simulation[J].Journal of Tropical Oceanography, 2012, 31(5): 106-115.

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Near-shore SST’s impact on typhoon return to the sea in numerical simulation

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