Seasonal variability of submesoscale vertical heat transport in the Kuroshio Extension

Guo Guizheng; Li Gang; He Yijun; Zhao Ruonan

doi:10.12284/hyxb2024033

Volume 46 Issue 4

Jun. 2024

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Guo Guizheng，Li Gang，He Yijun, et al. Seasonal variability of submesoscale vertical heat transport in the Kuroshio Extension[J]. Haiyang Xuebao，2024, 46(4)：23–33 doi: 10.12284/hyxb2024033

Citation:

Guo Guizheng，Li Gang，He Yijun, et al. Seasonal variability of submesoscale vertical heat transport in the Kuroshio Extension[J]. Haiyang Xuebao，2024, 46(4)：23–33 doi: 10.12284/hyxb2024033

Citation:

Guo Guizheng，Li Gang，He Yijun, et al. Seasonal variability of submesoscale vertical heat transport in the Kuroshio Extension[J]. Haiyang Xuebao，2024, 46(4)：23–33 doi: 10.12284/hyxb2024033

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Seasonal variability of submesoscale vertical heat transport in the Kuroshio Extension

doi: 10.12284/hyxb2024033

Guo Guizheng^1
,,
Li Gang¹,
He Yijun^{1, 2, 3
,
,},
Zhao Ruonan¹

1.
School of Marine Sciences, Nanjing University of Information Science and Technology, Nanjing 210044, China
2.
Key Laboratory of Space Ocean Remote Sensing and Applications, Ministry of Natural Resources, Beijing 100081, China
3.
Laboratory for Regional Oceanography and Numerical Modeling, Laoshan National Laboratory, Qingdao 266237, China

Received Date: 2023-11-24
Rev Recd Date: 2024-03-18

Available Online: 2024-05-16

Publish Date: 2024-06-30

Abstract

Abstract

Submesoscale processes associated with strong vertical velocities play significant roles in the vertical transport of tracers between the ocean surface and the interior, including heat, buoyancy, and mass. Based on the results of the (1/48)° LLC4320 model, this study investigates the seasonal variations of submesoscale vertical heat transport in the Kuroshio Extension. The results show that submesoscale vertical heat transport in the Kuroshio Extension exhibits distinct seasonal variations, with strong transport in spring and winter, and weaker transport in summer and autumn. The variation of net submesoscale vertical heat flux in the upper ocean is consistent with the trend of mixed layer depth, which shows overall upward submesoscale heat transport above the mixed layer and strong alternating positive and negative submesoscale vertical heat transport below the mixed layer, resulting in relatively small net submesoscale vertical heat transport. Coherent spectral analysis of vertical heat flux wavenumber-frequency suggests that submesoscale vertical heat transport below the mixed layer may be caused by linear internal waves, but the upward and downward vertical heat transports induced by linear internal waves counteract each other, leading to a reduced net vertical heat transport after averaging over the season.
- Kuroshio Extension,
- submesoscale,
- vertical heat transport

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References(32)

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