IMPACT OF WAVE INDUCED OCEAN UPPER LAYER MIXING ON HEAT TRANSPORT IN NUMERICAL TYPHOON SIMULATIONS

Abstract

 Wave-induced turbulent kinetic energy (TKE) plays an important role in numerical simulations of upper layer mixing in the ocean. In this study, improvements to a sea surface mixing parameterization have been made from the viewpoint of wave breaking based on observational data. The data shows that wave dissipation energy is more likely to be diffused into the water column when wind and wave directions are in opposite directions. In addition, the impact of the wave-dependent paramterization of ocean mixing on a numerical simulation of typhoon Haiyan (2013) has been analysed using the ocean-atmosphere-wave coupled model (COAWST). The results indicate that differences in sea surface temperature (SST) arise depending on the applied bulk formula used. It is also clarified that this difference originates from short wave radiation and internal heat transport induced by advection and vertical mixing. These differences have an impact even on atmospheric conditions such as wind speed, sea level pressure (SLP), and heat flux. The changes of both heat flux and wind energy are strongly correlated with that of minimum SLP . This study shows that wave conditions have a wide effect on ocean physics and atmospheric conditions; therefore, parameterizations that are wave-dependent are crucial for numerical simulation of sea surface mixing.