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Characterization of intraseasonal fluctuations in the abyssal South China Sea: An insight into the energy pathway
Quan, Qi1,2; Liu, Zhiqiang2; Yang, Yang3; Cai, Zhongya4,5; Zhang, Han6,7; Liu, Xiaohui7
Source PublicationProgress in Oceanography


Energetics of the abyssal ocean account greatly for the redistribution and dissipation of global oceanic energy. In this study, we characterize the intraseasonal fluctuations in the deep South China Sea (SCS) and evaluate the relevant energy budget using observations and numerical simulations. The results indicate substantial geographical inhomogeneity in the intraseasonal energy reservoir. The high-energy zones are located in the northwest of the Luzon Strait, northern slopes, deep western boundary current region, and southwestern cyclonic gyre region, where the intraseasonal fluctuations account for about 70% of the deep energy variability. Vorticity and divergence patterns of the intraseasonal motions are suggestive of quasigeostrophic dynamics, which are mostly attributed to the hybrid topographic-planetary Rossby waves. The flow field exhibits a weak lateral shear and appears to have symmetric instability with negative vorticity skewness, particularly over the sloping topography. Energetics analysis demonstrates that the intraseasonal fluctuations in the abyssal SCS obtain energy primarily from the upper layer through pressure work, while secondarily from advective transport and crossscale transfer due to instability of the deep circulation. To reach equilibrium, the energy gained is mostly damped by dissipations. As another reference in the marginal sea with intensive mixing, our study highlights the potential universality in how the intraseasonal energy is fueled and dissipated in the abyss.

KeywordIntraseasonal Fluctuations Abyssal Ocean South China Sea Energetics
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Indexed BySCIE
WOS Research AreaOceanography
WOS SubjectOceanography
WOS IDWOS:000819400300001
Scopus ID2-s2.0-85131412694
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Document TypeJournal article
Corresponding AuthorLiu, Zhiqiang
Affiliation1.State Key Laboratory of Estuarine and Coastal Research, East China Normal University
2.Department of Ocean Science and Engineering, Southern University of Science and Technology
3.School of Marine Sciences, Nanjing University of Information Science and Technology
4.State Key Laboratory of Internet of Things for Smart City and Department of Civil and Environmental Engineering
5.Center for Ocean Research in Hongkong and Macau
6.State Key Laboratory of Satellite Ocean Environment Dynamics, Second Institute of Oceanography, Ministry of Natural Resources
7.Shanghai Typhoon Institute, China Meteorological Administration
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GB/T 7714
Quan, Qi,Liu, Zhiqiang,Yang, Yang,et al. Characterization of intraseasonal fluctuations in the abyssal South China Sea: An insight into the energy pathway[J]. Progress in Oceanography,2022,209.
APA Quan, Qi,Liu, Zhiqiang,Yang, Yang,Cai, Zhongya,Zhang, Han,&Liu, Xiaohui.(2022).Characterization of intraseasonal fluctuations in the abyssal South China Sea: An insight into the energy pathway.Progress in Oceanography,209.
MLA Quan, Qi,et al."Characterization of intraseasonal fluctuations in the abyssal South China Sea: An insight into the energy pathway".Progress in Oceanography 209(2022).
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