气候变化领域集成服务门户(CCPortal): Variance of Bottom Water Temperature at the Continental Margin of the Northern South China Sea

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DOI	10.1029/2019JC015843
	Variance of Bottom Water Temperature at the Continental Margin of the Northern South China Sea
	Huang P.-Q.; Cen X.-R.; Guo S.-X.; Lu Y.-Z.; Zhou S.-Q.; Qiu X.-L.; Zhang J.-Z.; Wu Z.-L.; Han G.-H.
发表日期	2021
ISSN	21699275
卷号	126 期号:2
英文摘要	High-resolution temperature variation was examined about 40 days near the ocean bottom at 20 sites within an area of 110 × 120 km2 close to the continental margin of the northern South China Sea (depth ≈ 4,000 m). The monitoring depth (0.5 m above the bottom) was presumably within the lower part of the bottom mixed layer, compared to its median thickness of 63 m. At all sites, the bottom water had temperature variance less than 0.01°C, and it alternatively varied in the near-quiescent and internal wave states with time interval of diurnal period or even longer. Spectra of temperature variation showed that diurnal frequency dominated over the internal wave band. At different sites, the transition between internal wave band of scaling −2 and the inertial subrange turbulence of scaling −5/3 cannot easily be discriminated, attributed to the different intermittent presences of internal waves (tides). However, the resolved viscous-convective and viscous-diffusive subranges in the temperature spectrum provide the opportunity to evaluate the thermal (χ) and kinetic energy (ɛ) dissipation rates near the ocean bottom at each site. Close to a seamount, χ and ɛ were inferred to be about 1.2 × 10−12 °C2s−1 and 7.2 × 10−10 m2s−3, respectively, and they were strongly modulated by the diurnal internal tides. In the flat abyssal plain, χ and ɛ were much weaker, about at 3.2 × 10−14 °C2s−1 and 1.7 × 10−11 m2s−3, respectively. The spatial distribution of the nominal thermal χ, kinetic energy ɛ and the turbulent diffusivity Kρ indicated that they varied in the ranges [3.9 × 10−15 1.9 × 10−12] °C2s−1, [2.0 × 10−12 1.1 × 10−9] m2s−3, and [8.3 × 10−6 5.2 × 10−3] m2s−1, respectively, representing the different influences of internal waves and local topography. © 2021. American Geophysical Union. All Rights Reserved.
英文关键词	bottom mixing; bottom water temperature; northern South China Sea; turbulent dissipation
语种	英语
来源期刊	Journal of Geophysical Research: Oceans
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/186451
作者单位	State Key Laboratory of Tropical Oceanography, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou, China; University of Chinese Academy of Sciences, Beijing, China; Southern Marine Science and Engineering Guangdong Laboratory, Guangzhou, China; Institution of South China Sea Ecology and Environmental Engineering, Chinese Academy of Sciences, Guangzhou, China; Key Laboratory of Ocean and Marginal Sea Geology, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou, China; Guangzhou Marine Geological Survey, Guangzhou, China; Ocean Net Technology Co. Ltd., Guangzhou, China
推荐引用方式 GB/T 7714	Huang P.-Q.,Cen X.-R.,Guo S.-X.,et al. Variance of Bottom Water Temperature at the Continental Margin of the Northern South China Sea[J],2021,126(2).
APA	Huang P.-Q..,Cen X.-R..,Guo S.-X..,Lu Y.-Z..,Zhou S.-Q..,...&Han G.-H..(2021).Variance of Bottom Water Temperature at the Continental Margin of the Northern South China Sea.Journal of Geophysical Research: Oceans,126(2).
MLA	Huang P.-Q.,et al."Variance of Bottom Water Temperature at the Continental Margin of the Northern South China Sea".Journal of Geophysical Research: Oceans 126.2(2021).