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Preprints
https://doi.org/10.5194/os-2020-21
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/os-2020-21
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

  20 Apr 2020

20 Apr 2020

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A revised version of this preprint is currently under review for the journal OS.

Response of near-inertial energy to a supercritical tropical cyclone and jet stream in the South China Sea: modeling study

Hiu Suet Kung and Jianping Gan Hiu Suet Kung and Jianping Gan
  • Department of Ocean Science and Department of Mathematics, Hong Kong University of Science, and Technology, Hong Kong

Abstract. We used a well-validated three-dimensional ocean model to investigate the process of energetic response of near-inertial oscillations (NIOs) to a tropical cyclone (TC) and strong background jet stream in the South China Sea (SCS). We found that the NIO and near-inertial kinetic energy (KEni) varied distinctly during different stages of the TC forcing, and the horizontal and vertical transport of KEni was largely modulated by the velocity and vorticity of the jet stream. The KEni reached its peak value within ~one-half the inertial period after the initial TC forcing stage in the upper layer, decayed quickly by one-half in the next two days, and further decreased in a slower rate during the relaxation stage of the TC forcing. Analyses of the KEni balance indicate that the weakened KEni in the upper layer during the forcing stage was mainly attributed to the downward KEni transport due to pressure work through the vertical displacement of isopycnal surface, while the upward KEni advection from depths also contributed to the weakening in the TC-induced upwelling region. In contrast, during the relaxation stage as TC moved away, the effect of vertical advection on KEni reduction was negligible and the KEni was chiefly removed by the outward propagation of inertial-gravity waves, horizontal advection and viscous dissipation. Both the outward wave propagation and horizontal advection by the jet stream provided the KEni source in the far-field. During both stages, the negative geostrophic vorticity south of the jet stream facilitated the vertical propagation of inertial-gravity waves.

Hiu Suet Kung and Jianping Gan

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Hiu Suet Kung and Jianping Gan

Hiu Suet Kung and Jianping Gan

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Latest update: 04 Aug 2020
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Short summary
Based on a well-validated ocean circulation model, we found that near-inertial oscillations (NIOs) and near-inertial kinetic energy (KEni) varied distinctly during forcing and relaxation stages of the TC forcing, and the horizontal and vertical transport of KEni was largely modulated by the velocity and vorticity of the jet stream in the semi-enclosed South China Sea (SCS). This study enriches our understanding of the spatial-temporal variability of NIOs in the frequently TC-affected SCS.
Based on a well-validated ocean circulation model, we found that near-inertial oscillations...
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