气候变化领域集成服务门户(CCPortal): Topographical Control of the Source-Sink and Wind Stress-Driven Planetary Geostrophic Circulation in a Polar Basin

CCPortal

DOI	10.1029/2019JC015571
	Topographical Control of the Source-Sink and Wind Stress-Driven Planetary Geostrophic Circulation in a Polar Basin
	Gavilan Pascual-Ahuir E.; Willmott A.J.; Morales Maqueda M.; Luneva M.
发表日期	2020
ISSN	21699275
卷号	125 期号:3
英文摘要	The effects of topography on the barotropic circulation in a polar basin are examined analytically and numerically. New approximate linear analytical solutions are presented for steady-state wind and boundary forced barotropic planetary geostrophic circulation in a circular polar basin with a step shelf. The solutions are obtained by retaining the full spherical geometry in the derivation of the forced potential vorticity equation; thereafter the colatitude is fixed in the coefficients of this governing equation. The accuracy of the analytical solutions is evaluated by comparing them with the equivalent numerical solutions obtained using the NEMO modeling system. Subsequently, the impact of a nonuniform width shelf on source-sink-driven circulation is investigated numerically. The equipartition of fluid entering the source strait into cyclonic and anticyclonic shelf currents, exiting the basin at the sink strait, in a basin with a uniform width shelf is shown to be modified when the shelf width varies. In general, the wider shelf supports a current with larger transport, irrespective of the azimuthal extent of the wider shelf. The study concludes with a numerical investigation of wind-driven circulation in a basin with a step shelf, three straits, and a transpolar ridge, a prototype Arctic Ocean simulation. Topographic steering by the ridge supports a transpolar drift current, the magnitude of which depends on the ridge height. Without the ridge, the transpolar drift current is absent and the circulation is confined to gyres on the shelf and in the deep basin. © 2020. American Geophysical Union. All Rights Reserved.
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/186951
作者单位	College of Oceanography, Hohai University, Nanjing, China; Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), Zhuhai, China; School of Mathematics, Statistics and Physics, Newcastle University, Newcastle upon Tyne, United Kingdom; School of Natural and Environmental Sciences, Newcastle University, Newcastle upon Tyne, United Kingdom; National Oceanography Centre, Liverpool, United Kingdom
推荐引用方式 GB/T 7714	Gavilan Pascual-Ahuir E.,Willmott A.J.,Morales Maqueda M.,et al. Topographical Control of the Source-Sink and Wind Stress-Driven Planetary Geostrophic Circulation in a Polar Basin[J],2020,125(3).
APA	Gavilan Pascual-Ahuir E.,Willmott A.J.,Morales Maqueda M.,&Luneva M..(2020).Topographical Control of the Source-Sink and Wind Stress-Driven Planetary Geostrophic Circulation in a Polar Basin.Journal of Geophysical Research: Oceans,125(3).
MLA	Gavilan Pascual-Ahuir E.,et al."Topographical Control of the Source-Sink and Wind Stress-Driven Planetary Geostrophic Circulation in a Polar Basin".Journal of Geophysical Research: Oceans 125.3(2020).