气候变化领域集成服务门户(CCPortal): Baroclinic Residual Circulation and Mass Transport Due to Internal Tides

CCPortal

DOI	10.1029/2019JC015316
	Baroclinic Residual Circulation and Mass Transport Due to Internal Tides
	Masunaga E.; Arthur R.S.; Yamazaki H.
发表日期	2020
ISSN	21699275
卷号	125 期号:4
英文摘要	Baroclinic (BC) tidal residual circulation due to internal tides is investigated around islands over a shallow ridge using a numerical ocean model. Internal tides enhance vertical mixing over shallow slopes, leading to horizontal density gradients that drive BC residual circulation along the main thermocline. For a strongly stratified summer case, the vertical diffusivity estimated by the Mellor and Yamada turbulence closure model exceeds 1 × 10−2 m2 s−1, and the velocity of BC residual circulations reaches 0.2 m s−1. The magnitude of BC residual circulation is larger than that of barotropic residual tidal circulation, implying that BC residual circulation due to internal tides plays an important role in coastal ocean circulation. Furthermore, BC residual flow accounts for an equal percentage (5%) of the total tidal kinetic energy as the barotropic residual flow under summer stratification conditions. Results from a coupled sediment resuspension and transport model show the growth of intermediate nepheloid layers formed by strong bottom shear stress and BC residual flow. The residual component contributes largely (23% of the total in summer) to the total suspended sediment flux. Seasonal variability is explored, with weaker winter stratification leading to reduced mixing, and thus weaker BC residual circulation and sediment flux. The magnitude of the BC residual circulation is also shown to be proportional to the square of the tidal amplitude. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	internal tides; mixing; residual flow; sediment transport
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/186916
作者单位	Center for Water Environment Studies, Ibaraki University, Ibaraki, Japan; Lawrence Livermore National Laboratory, Livermore, CA, United States; Department of Ocean Sciences, Tokyo University of Marine Science and Technology, Tokyo, Japan
推荐引用方式 GB/T 7714	Masunaga E.,Arthur R.S.,Yamazaki H.. Baroclinic Residual Circulation and Mass Transport Due to Internal Tides[J],2020,125(4).
APA	Masunaga E.,Arthur R.S.,&Yamazaki H..(2020).Baroclinic Residual Circulation and Mass Transport Due to Internal Tides.Journal of Geophysical Research: Oceans,125(4).
MLA	Masunaga E.,et al."Baroclinic Residual Circulation and Mass Transport Due to Internal Tides".Journal of Geophysical Research: Oceans 125.4(2020).