Impacts of Surface Exchange Coefficients on Simulations of Super Typhoon Megi(2010)Using a Coupled Ocean-Atmosphere-Wave Model  

作　　者：ZHANG Wenqing ZHANG Jialin GUAN Changlong SUN Jian 

机构地区：[1]College of Oceanic and Atmospheric Sciences,Ocean University of China,Qingdao 266100,China [2]Physical Oceanography Laboratory,Ocean University of China,Qingdao 266100,China [3]Qingdao Municipal Marine Development and Promotion Center,Qingdao 266071,China

出　　处：《Journal of Ocean University of China》2023年第3期587-600,共14页中国海洋大学学报（英文版）

基　　金：supported by the National Natural Science Foundation of China(Nos.41906014,U20A2099 and 41976017)。

摘　　要：In this study,the effects of surface exchange coefficients on simulations of Super Typhoon Megi(2010)are investigated using a fully coupled ocean-atmosphere-wave model.Several experiments are conducted using different parameterization schemes for the drag(C_(D))and enthalpy exchange(C_(K))coefficients.For the selected case,considering only the leveling-off of C_(D)at high wind speeds does not effectively improve the simulated typhoon track,intensity,or size.We found that increasing C_(K)monotonically with wind speed(Komori et al.,2018)yields stronger winds and deeper pressures by enhancing latent and sensible heat fluxes,but typhoon intensity remains underestimated.We propose a new higher C_(K)than that from Komori et al.(2018)based on the theory of Emanuel(1995).This approach produces a greater modeled typhoon intensity that is in good agreement with the best track data and effectively improves the track error for the simulation.Improved accuracy for modeled typhoon intensity is achieved with the new coefficient because C_(K)/C_(D)reaches the threshold of about 0.75 predicted by Emanuel(1995).The new proposed C_(K)also results in a reasonably accurate modeled sea surface temperature.However,typhoon size and surface wave height are overestimated.This finding implies that more numerical tests for tropical cyclones of different nature(such as strong,weak,dissipating,rapidly intensifying,or weakening tropical cyclones)should be studied,and more physical processes should be explored in future coupled models.

关 键 词：TYPHOON drag coefficient enthalpy exchange coefficient coupled ocean-atmosphere-wave model 

分 类 号：P461[天文地球—大气科学及气象学]