The thermodynamic balance of the Weddell Gyre

被引：24

作者：

Garabato, Alberto C. Naveira ^{[1
]}

Zika, Jan D. ^{[1
]}

Jullion, Loic ^{[2
,3
]}

Brown, Peter J. ^{[4
]}

Holland, Paul R. ^{[5
]}

Meredith, Michael P. ^{[5
]}

Bacon, Sheldon ^{[4
]}

机构：

[1] Univ Southampton, Natl Oceanog Ctr, Southampton, Hants, England

[2] Aix Marseille Univ, CNRS INSU, IRD, MIO, Marseille, France

[3] Univ Toulon & Var, CNRS INSU, IRD, MIO, La Garde, France

[4] Natl Oceanog Ctr, Southampton, Hants, England

[5] British Antarctic Survey, Cambridge CB3 0ET, England

来源：

GEOPHYSICAL RESEARCH LETTERS | 2016年 / 43卷 / 01期

基金：

英国自然环境研究理事会;

关键词：

Weddell Gyre; thermodynamics; SEA-ICE; SOUTHERN-OCEAN; DEEP; STRATIFICATION; CIRCULATION;

D O I：

10.1002/2015GL066658

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

The thermodynamic balance of the Weddell Gyre is assessed from an inverse estimate of the circulation across the gyre's rim. The gyre experiences a weak net buoyancy gain that arises from a leading-order cancelation between two opposing contributions, linked to two cells of water mass transformation and diapycnal overturning. The lower cell involves a cooling-driven densification of 8.42.0Sv of Circumpolar Deep Water and Antarctic Bottom Water near the gyre's southern and western margins. The upper cell entails a freshening-driven conversion of 4.92.0Sv of Circumpolar Deep Water into lighter upper ocean waters within the gyre interior. The distinct role of salinity between the two cells stems from opposing salinity changes induced by sea ice production, meteoric sources, and admixture of fresh upper ocean waters in the lower cell, which contrasts with coherent reductions in salinity associated with sea ice melting and meteoric sources in the upper cell.

引用

页码：317 / 325

页数：9

共 24 条

[1] Surface albedo of the Antarctic sea ice zone [J].

Brandt, RE ;

Warren, SG ;

Worby, AP ;

Grenfell, TC .

JOURNAL OF CLIMATE, 2005, 18 (17) :3606-3622

[2] Freshwater fluxes in the Weddell Gyre: results from δ18O [J].

Brown, Peter J. ;

Meredith, Michael P. ;

Jullion, Loic ;

Garabato, Alberto Naveira ;

Torres-Valdes, Sinhue ;

Holland, Paul ;

Leng, Melanie J. ;

Venables, Hugh .

PHILOSOPHICAL TRANSACTIONS OF THE ROYAL SOCIETY A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES, 2014, 372 (2019)

[3]

de Lavergne C, 2014, NAT CLIM CHANGE, V4, P278, DOI [10.1038/NCLIMATE2132, 10.1038/nclimate2132]

[4] Antarctic sea ice control on ocean circulation in present and glacial climates [J].

Ferrari, Raffaele ;

Jansen, Malte F. ;

Adkins, Jess F. ;

Burke, Andrea ;

Stewart, Andrew L. ;

Thompson, Andrew F. .

PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA, 2014, 111 (24) :8753-8758

[5]

Holland PR, 2012, NAT GEOSCI, V5, P872, DOI [10.1038/NGEO1627, 10.1038/ngeo1627]

[6] Decline of deep and bottom water ventilation and slowing down of anthropogenic carbon storage in the Weddell Sea, 1984-2011 [J].

Huhn, Oliver ;

Rhein, Monika ;

Hoppema, Mario ;

van Heuven, Steven .

DEEP-SEA RESEARCH PART I-OCEANOGRAPHIC RESEARCH PAPERS, 2013, 76 :66-84

[7]

Jackett DR, 1997, J PHYS OCEANOGR, V27, P237, DOI 10.1175/1520-0485(1997)027<0237:ANDVFT>2.0.CO

[8]

[9] The contribution of the Weddell Gyre to the lower limb of the Global Overturning Circulation [J].

Jullion, Loic ;

Garabato, Alberto C. Naveira ;

Bacon, Sheldon ;

Meredith, Michael P. ;

Brown, Pete J. ;

Torres-Valdes, Sinhue ;

Speer, Kevin G. ;

Holland, Paul R. ;

Dong, Jun ;

Bakker, Dorothee ;

Hoppema, Mario ;

Loose, Brice ;

Venables, Hugh J. ;

Jenkins, William J. ;

Messias, Marie-Jose ;

Fahrbach, Eberhard .

JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS, 2014, 119 (06) :3357-3377

[10] On the Linkage between Antarctic Surface Water Stratification and Global Deep-Water Temperature [J].

Keeling, Ralph F. ;

Visbeck, Martin .

JOURNAL OF CLIMATE, 2011, 24 (14) :3545-3557

← 1 2 3 →