Numerical Simulation Of Ocean Waves Affecting The Upper Ocean

Ocean wave,as an important form in the sea-air interface,plays an important role in energy input,velocity profile and sea surface temperature of the ocean upper mixing layer.This paper uses the mean of numerical model to study the influence of ocean wave on the upper ocean by wave model,circulation model and wave-circulation coupled model.Firstly,the NCEP wind is used to drive the WAVEWATCH?wave model and the simulated result shows that the simulated significant wave height agrees well with the ECMWF reanalysis data,NDBC buoy data and Jason-2 satellite data.Then we calculate the global wave-induced Stokes-drift,Stokes transport and radiation stress based on the simulated wave elements and found the global distribution characteristics of these phenomena is similar to the significant wave height,presenting a zonal distribution characteristic that high latitude is larger.In the area of Antarctic circumpolar current,wave-induced Stokes-drift and Stokes transport is more obvious and the biggest value can reach 0.2 m/s and 1 m~2/s respectively.The Stokes depth is greater in the east side than the west and the maximum depth is up to 20 m.Different principal components of radiation stress are distinctive in numerical value.The maximum of principal component Sxx is about 600 N/m~2,and Sxy and Syy are relatively smaller.Secondly,we analysis the physical mechanism of the effects of Stokes-drift in the upper ocean from Stokes transport caused by Stokes-drift,Coriolis-Stokes forcing and Langmuir turbulence effect by adding Stokes-drift into the governing equations of SBPOM circulation model.And we also provide a specific numerical influence.The results show that the Stokes-drift can increase the vertical mixing coefficient through affecting MY2.5 turbulence model and the maximum growth rate can reach 0.2 m~2/s.It also deepens the action depth of vertical mixing coefficient,even extending down to two times at some waters.Not only that,Stokes-drift has a cooling effect on global sea surface temperature and the cooling in high latitude is greater than that in the middle and low.The maximum cooling is about 1.5?,and especially in the area of Antarctic circumpolar current,the most significant average cooling is about 0.18?.From the aspect of global Langmuir number,Langmuir turbulence effect in high latitude is greater than that in middle and low,and corresponds to the global cooling distribution.By comparing Argo data shows that the sea surface temperature simulated by considering Stokes-drift is closer to the real value.Finally,with the actual typhoons as the research background,we analysis the impacts of ocean wave on the sea surface velocity field and sea surface temperature by considering the wind stress affected by wave and current,Coriolis-Stokes forcing and radiation stress in FVCOM coupled model.The results show that the variation of sea surface velocity field under the action of waves corresponds to the typhoon center,presenting a cyclonic structure.The waves caused by typhoon can depress sea surface temperature significantly and the maximum cooling can exceed 3?in the area of typhoon center.In addition,the cooling range is closely related to the wave intensity.