黑潮延伸体海域次中尺度过程的季节变化研究

doi:10.11978/2019140

Abstract

Abstract:

Recent field observations and theoretical analysis have revealed that submesoscale activities are ubiquitous in the upper ocean, and that their formation is closely related to frontogenesis and mixed layer instability. Based on high-resolution numerical simulations and diagnostic analysis, we investigate the seasonal variability of submesoscale activities in the upper ocean of the Kuroshio Extension. The results suggest that the submesoscale behaviors in the Kuroshio Extension have significant seasonal variation. Although the mesoscale eddy energy of the Kuroshio Extension is weak in winter, the submesoscale activities are the most active on the seasonal scale, which is likely due to the contribution of the mixed layer baroclinic instabilities in the upper ocean. The mixed layer is shallow in summer with weak submesoscale activities, but the mesoscale eddies are active. The diagnosis of frontal tendency suggests that the frontogenesis caused by the deformation of mesoscale flows be the main contributor to the submesoscale activities in summer. Also, the energy transformation from mesoscale to submesoscale has significant seasonal variation with the conversion rates of available potential energy and kinetic energy in winter much higher than those in summer, which contributes to richer submesoscale activities in winter than in summer. These results can improve our understanding of the seasonal variation of submesoscale activities and their dynamical mechanisms in the Kuroshio Extension.

Key words: Kuroshio Extension, submesoscale flows, seasonal variation, frontogenesis

CLC Number:

P731.27

LUO Shihao, JING Zhiyou, YAN Tong, ZHENG Ruixi, CAO Haijin, QI Yiquan. Seasonal variability of submesoscale flows in the Kuroshio Extension[J].Journal of Tropical Oceanography, 2021, 40(1): 1-11.

Figures/Tables 10

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Seasonal variability of submesoscale flows in the Kuroshio Extension

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