Sensitivity of the Oceanic Mixed Layer to the Surface Evaporation in the Presence of the Wind and Wave Forcing through the Large Eddy Simulation in the north Arabian Sea during Summer Monsoon
The effects of evaporation on the ocean mixed layer in the presence or the absence of Langmuir circulation (LC) and wave breaking (WB) is studied through the Large Eddy Simulation. We have used approximate parameters of summer monsoon for defining the experimental simulations. The simulations were conducted for 33.5 hours and we ignored the first 9.5 hours of results and the simulated parameters is investigated during 24 hours period. We can mention that there is a good matching between diurnal variations of TKE and SST with diurnal changes of latent heat flux in the presence of evaporation and absence of Langmuir circulation and wave breaking and TKE in this case increased between 25 to 100 percent related to the case on the absence of evaporation. Although, evaporation in the presence of LC and WB decreased SST, around 0.060 C in a 24 hours period, but as expected, it decreased SST in the case of presence of LC and WB less than it (0.050 C). Meanwhile, it was found that, evaporation in the absence of LC and WB causes a slight decrease in velocity shear and shear production and an increase in dissipation rate (approximately double), pressure transport, and TKE transport. These two terms of TKE budget balance with dissipation rate close to the sea surface and the diurnal changes of TKE profile is observable just in this case. However, the most effect of adding the presence of evaporation to the presence of LC and WB in TKE budget is summarized to decreasing of shear production in the middle part of ocean mixed layer. It is also found that, in the presence of evaporation, presence or absence of LC and WB doesn't affect the profile of turbulent heat flux; similar to the evaporation which doesn’t change the Stokes production.
Article Type:
Research/Original Article
Marine Technology, Volume:6 Issue:2, 2019
83 - 94  
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