Weddell Gyre: structure of the eastern boundary

Gouretski, Victor V.; Danilov, A. I.

doi:10.1016/0967-0637(93)90146-t

Cited by 70 publications

(58 citation statements)

References 16 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…This subsurface water, known as Circumpolar Deep Water (CDW), but locally called Warm Deep Water (WDW), is recognized by its temperature maximum (T max ) just underneath the pycnocline. The highest T max values are found in the southeastern Weddell Gyre, indicating that that region is the main recipient of CDW source water (Deacon, 1979;Gouretski and Danilov, 1993). On its course through the gyre, the T max is attenuated by mixing with waters above and below.…”

Section: Introductionmentioning

confidence: 99%

“…It is a highly dynamical and variable region with many eddies resulting from interactions of the ACC with topography (Gouretski and Danilov, 1993). Local deep-sea promontories, like Astrid Ridge and Maud Rise (Fig.…”

Section: Introductionmentioning

confidence: 99%

“…Subsurface water is supplied by the ACC, where it is swept into the Weddell Gyre at its eastern boundary, i.e. 25 • E to 30 • E (Deacon, 1979;Gouretski and Danilov, 1993;Schröder and Fahrbach, 1999). There may be another subsurface water supply near 20 • W (Bagriantsev et al, 1989).…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

A rapid transition from ice covered CO2–rich waters to a biologically mediated CO2 sink in the eastern Weddell Gyre

et al. 2008

View full text Add to dashboard Cite

Abstract. Circumpolar Deep Water (CDW), locally called Warm Deep Water (WDW), enters the Weddell Gyre in the southeast, roughly at 25 • E to 30 • E. In December 2002 and January 2003 we studied the effect of entrainment of WDW on the fugacity of carbon dioxide (fCO 2 ) and dissolved inorganic carbon (DIC) in Weddell Sea surface waters. Ultimately the fCO 2 difference across the sea surface drives airsea fluxes of CO 2 . Deep CTD sections and surface transects of fCO 2 were made along the Prime Meridian, a northwestsoutheast section, and along 17 • E to 23 • E during cruise ANT XX/2 on FS Polarstern. Upward movement and entrainment of WDW into the winter mixed layer had significantly increased DIC and fCO 2 below the sea ice along 0 • W and 17 • E to 23 • E, notably in the southern Weddell Gyre. Nonetheless, the ice cover largely prevented outgassing of CO 2 to the atmosphere. During and upon melting of the ice, biological activity rapidly reduced surface water fCO 2 by up to 100 µatm, thus creating a sink for atmospheric CO 2 . Despite the tendency of the surfacing WDW to cause CO 2 supersaturation, the Weddell Gyre may well be a CO 2 sink on an annual basis due to this effective mechanism involving ice cover and ensuing biological fCO 2 reduction. Dissolution of calcium carbonate (CaCO 3 ) in melting sea ice may play a minor role in this rapid reduction of surface water fCO 2 .

show abstract

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

A rapid transition from ice covered CO2–rich waters to a biologically mediated CO2 sink in the eastern Weddell Gyre

et al. 2008

View full text Add to dashboard Cite

show abstract

“…On entry into the Gyre near 30°E, this water has a temperature of about 1.5°C and salinity of about 34.74, but after its passage around the Gyre, these have been reduced to about 0.4°C and 34.68 (Fahrbach et al 1994). The eastern Weddell Gyre is a complex region where Circumpolar Deep Water mixes with colder and fresher WDW returning from the Weddell Sea to form a new WDW which enters the Gyre here (Gouretski and Danilov 1993;Schröder and Fahrbach 1999).…”

Section: Introductionmentioning

confidence: 99%

Modification by lateral mixing of the Warm Deep Water entering the Weddell Sea in the Maud Rise region

2010

View full text Add to dashboard Cite

Deep water originating in the North Atlantic is transported across the Antarctic Circumpolar Current by eddies and, after circumnavigating of the Antarctic, enters the Weddell Gyre south of Africa. As it does so, it rises up from mid-depth towards the surface. The separate temperature and salinity maxima, the Upper and Lower Circumpolar Deep Waters, converge to form the Warm Deep Water. Cores of this water mass on the southern flank of the eastern Weddell Gyre show a change in characteristic as they flow westward in the Lazarev Sea. Observations have been made along four meridional sections at 3°E, 0°, 3°W and 6°W between 60 and 70°S during the Polarstern Cruise ANTXXIII/2 in 2005/2006. These show that a heterogeneous series of warm and salty cores entering the region from the east both north and south of Maud Rise (65°S, 3°W) gradually merge and become more homogeneous towards the west. The gradual reduction in the variance of potential temperature on isopycnals is indicative of isopycnic mixing processes. A multiple regression technique allows diagnosis of the eddy diffusivities and, thus, the relative importance of isopycnic and diapycnic mixing. The method shows that the isopycnic diffusivity lies in the range 70-140 m 2 s −1 and the diapycnic diffusivity reaches about 3×10 −6 m 2 s −1 . Scale analysis suggests that isopycnic diffusion dominates over diapycnic diffusion in the erosion of the Warm Deep Water cores.

show abstract

“…Na porção oeste da Bacia Argentina, a CDW se divide em duas camadas: a CDW superior (UCDW) e a inferior (LCDW). A primeira caracteriza-se por baixa concentração de oxigênio dissolvido e alta concentração de nutrientes, tendo sua origem nos oceanos Pacífico eÍndico, enquanto a LCDW caracteriza-se pela alta salinidade (Gouretski & Danilov, 1993;Orsi et al, 1995), sendo derivada da NADW. Em 40 • S, a UCDWé caracterizada por profundidades de ∼1400m, temperatura (θ<2,9…”

unclassified

Influência do gelo marinho antártico no setor austral sudoeste do Atlântico Sul

Pereira¹

View full text Add to dashboard Cite

Weddell Gyre: structure of the eastern boundary

Cited by 70 publications

References 16 publications

A rapid transition from ice covered CO<sub>2</sub>–rich waters to a biologically mediated CO<sub>2</sub> sink in the eastern Weddell Gyre

A rapid transition from ice covered CO<sub>2</sub>–rich waters to a biologically mediated CO<sub>2</sub> sink in the eastern Weddell Gyre

Modification by lateral mixing of the Warm Deep Water entering the Weddell Sea in the Maud Rise region

Influência do gelo marinho antártico no setor austral sudoeste do Atlântico Sul

Contact Info

Product

Resources

About

Weddell Gyre: structure of the eastern boundary

Cited by 70 publications

References 16 publications

A rapid transition from ice covered CO&lt;sub&gt;2&lt;/sub&gt;–rich waters to a biologically mediated CO&lt;sub&gt;2&lt;/sub&gt; sink in the eastern Weddell Gyre

A rapid transition from ice covered CO&lt;sub&gt;2&lt;/sub&gt;–rich waters to a biologically mediated CO&lt;sub&gt;2&lt;/sub&gt; sink in the eastern Weddell Gyre

Modification by lateral mixing of the Warm Deep Water entering the Weddell Sea in the Maud Rise region

Influência do gelo marinho antártico no setor austral sudoeste do Atlântico Sul

Contact Info

Product

Resources

About

A rapid transition from ice covered CO<sub>2</sub>–rich waters to a biologically mediated CO<sub>2</sub> sink in the eastern Weddell Gyre

A rapid transition from ice covered CO<sub>2</sub>–rich waters to a biologically mediated CO<sub>2</sub> sink in the eastern Weddell Gyre