Numerical Study Of The Effect Of Wave-induced Mixing On The Upper Mixed Layer In The Northwest Pacific Ocean During Typhoon

The waves are one of the most important physical features of the ocean surface and have a profound impact on the ocean upper mixed layers of.The strong winds during the typhoon will cause huge waves on the surface of the sea,further enhancing the role of the waves on the mixed layers on the ocean.Based on the previous theoretical research framework,this paper combines the Marine Science and N umerical Modeling(MASNUM)wave model and the Princeton Ocean Model(POM)by introducing the wave mixing effect into the circulation field,and establishes a high-resolution wave-circulation coupling model.The wave-circulation coupling model was used to study the effects of wave-induced turbulent mixing and wave transport flux residue on the upper mixing layer in the Northwest Pacific Ocean.Taking Typhoon Nepartak as an example,we paid particular attention to the impact of the waves on upper mixing layer during the typhoon.The coupled numerical model simulation results show that:(1)Through the introduction of wave-induced mixing,the model ability to simulate sea surface temperature in the year of 2016 was improved,with the most obvious effects occurring during the summer and early autumn.(2)During the typhoon,wave-induced turbulent mixing enabled the model's ability to simulate the cooling magnitude of sea surface temperature.At the same time,the simulation ability of mixed layer depth has also been significantly improved.The maximum mixed layer depth reached 57 meters,which is only 2 meters away from the 59 meters of the Argo buoy observation.(3)Wave transport flux residue o n the one hand can further improve the results in above two aspects.O n the other hand,it can also play a positive role in simulating the distribution of cooling area and the variation of the mixed layer temperature.The trend of the maximum cooling zone shifting to the left of the typhoon path was suppressed and a cooling area located in right front of the typhoon was successfully simulated.The variation process of simulated mixed layer temperature during the typhoon is also more consistent with observations.