气候变化领域集成服务门户(CCPortal): Structure of the Subpolar Gyre in the Australian-Antarctic Basin Derived From Argo Floats

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DOI	10.1029/2019JC015406
	Structure of the Subpolar Gyre in the Australian-Antarctic Basin Derived From Argo Floats
	Yamazaki K.; Aoki S.; Shimada K.; Kobayashi T.; Kitade Y.
发表日期	2020
ISSN	21699275
卷号	125 期号:8
英文摘要	The climatological structure of the subpolar cyclonic circulation off East Antarctica is delineated with Argo float data from the past decade. Up to 40% of the float profiles in the seasonal ice zone have been without satellite positioning. We refined their position data as following the bathymetry to get appropriate positions in the continental margin. The error of the terrain-following interpolation was estimated by using positioned data to be 23 ± 27 (78 ± 70) km for 90 (390) day period. Profiles with the under-ice period shorter than 360 days are adopted. The float trajectories reveal the extent of the subpolar gyre adjoined to the westward Antarctic Slope Current to its south and the southernmost eastward jet of the Antarctic Circumpolar Current along 4,000 m isobath to its north. The subpolar circulation in the Australian-Antarctic Basin comprises of a series of quasi-barotropic subgyre circulations, which are bounded by bathymetric spurs in the continental slope. The temperature field reveals shoreward excursions of Circumpolar Deep Water associated with the subgyres, effectively supplying heat to the continental shelves. An along-slope temperature variation up to 1°C in 27.7–27.8 kg/m3 σθ indicates an active cross-slope exchange within the layer. Provided the velocity field and the water mass structure, the subsurface water mass exchange is likely accomplished by a combination of topographically controlled mean flow and the eddy transports. Our findings suggest that the bathymetry primarily determines the structure of the subpolar gyre. ©2020. The Authors.
英文关键词	Antarctic Circumpolar Current; Argo float; circumpolar deep water; Southern Ocean; subpolar gyre; under-ice float
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/186727
作者单位	Graduate School of Environmental Science, Hokkaido University, Japan; Institute of Low Temperature Science, Hokkaido University, Japan; Tokyo University of Marine Science and Technology, Japan; Japan Agency for Marine-Earth Science and Technology, Kanagawa, Japan
推荐引用方式 GB/T 7714	Yamazaki K.,Aoki S.,Shimada K.,et al. Structure of the Subpolar Gyre in the Australian-Antarctic Basin Derived From Argo Floats[J],2020,125(8).
APA	Yamazaki K.,Aoki S.,Shimada K.,Kobayashi T.,&Kitade Y..(2020).Structure of the Subpolar Gyre in the Australian-Antarctic Basin Derived From Argo Floats.Journal of Geophysical Research: Oceans,125(8).
MLA	Yamazaki K.,et al."Structure of the Subpolar Gyre in the Australian-Antarctic Basin Derived From Argo Floats".Journal of Geophysical Research: Oceans 125.8(2020).