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Ocean Science An interactive open-access journal of the European Geosciences Union
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Volume 12, issue 1 | Copyright
Ocean Sci., 12, 335-344, 2016
https://doi.org/10.5194/os-12-335-2016
© Author(s) 2016. This work is distributed under
the Creative Commons Attribution 3.0 License.

Research article 01 Mar 2016

Research article | 01 Mar 2016

On the near-inertial variations of meridional overturning circulation in the South China Sea

Jingen Xiao1,2, Qiang Xie1,3, Dongxiao Wang1, Lei Yang1, Yeqiang Shu1, Changjian Liu4, Ju Chen1, Jinglong Yao1, and Gengxin Chen1 Jingen Xiao et al.
  • 1State Key Laboratory of Tropical Oceanography (LTO), South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou, China
  • 2College of Earth Science, University of Chinese Academy of Sciences, Beijing, China
  • 3Sanya Institute of Deep-sea Science and Engineering, Chinese Academy of Sciences, Sanya, China
  • 4South China Sea Marine Engineering Survey Center, State Ocean Administration, Guangzhou, China

Abstract. We examine near-inertial variability of the meridional overturning circulation in the South China Sea (SCSMOC) using a global 1 / 12° ocean reanalysis. Based on wavelet analysis and power spectrum, we suggest that deep SCSMOC has a significant near-inertial band. The maximum amplitude of the near-inertial signal in the SCSMOC is nearly 4Sv. The spatial structure of the signal features regularly alternating counterclockwise and clockwise overturning cells. It is also found that the near-inertial signal of SCSMOC mainly originates from the region near the Luzon Strait and propagates equatorward at a speed of 1–3ms−1. Further analyses suggest that the near-inertial signal in the SCSMOC is triggered by high-frequency wind variability near the Luzon Strait, where geostrophic shear always exists due to Kuroshio intrusion.

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We examine near-inertial variability of the meridional overturning circulation in the South China Sea (SCSMOC) using a global 1 / 12° ocean reanalysis. Based on wavelet analysis and power spectrum, we suggest that deep SCSMOC has a significant near-inertial band. The maximum amplitude of the near-inertial signal in the SCSMOC is nearly 4 Sv. The spatial structure of the signal features regularly alternating counterclockwise and clockwise overturning cells.
We examine near-inertial variability of the meridional overturning circulation in the South...
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