The influence of the eddy in north pacific on ocean internal mixing based on the finescale parameterization

Based on the Vector Geometry method, the eddy identification is carried out by using the altimeter data in 2016-2018, and the ocean internal diapycnal mixing diffusivity near the eddy is calculated by using the finescale parameterization method and the Argo data. The influence of the eddy in the North Pacific on the internal mixing of the ocean is analyzed. The results show that the average diffusivity of the study region under the influence of eddies is 6% greater than that without the influence of the eddy. The cyclonic eddy enhances the mixing of 600-1200m depth, and the effect on the mixing at the depth of 600-900m is the maximal and can be up to 18%. The anticyclonic eddy significantly enhances the mixing at the depth of 300-900m, but the effect on the mixing at the depth of 900-1200m is not obvious. As the distance from the center of the eddy increases, the diffusivity outside the eddy slowly decreases and that inside the eddy does not change significantly, the result is consistent with the one of a single case analysis of the region (24°N-36°N and 132°E-152°E) from March to October 2014. Moreover, as the intensity of the eddy increases, the diapycnal mixing is significantly enhanced. The statistical result in the study region shows that the diffusivity value of 90 percent is within the range of 10^-5.5-10^-4 m²/s.