Atlantic water flow into the Arctic Ocean through the St. Anna Trough in the northern Kara Sea

被引:45
作者
Dmitrenko, Igor A. [1 ]
Rudels, Bert [2 ]
Kirillov, Sergey A. [1 ]
Aksenov, Yevgeny O. [3 ]
Lien, Vidar S. [4 ]
Ivanov, Vladimir V. [5 ,6 ]
Schauer, Ursula [7 ]
Polyakov, Igor V. [6 ]
Coward, Andrew [3 ]
Barber, David G. [1 ]
机构
[1] Univ Manitoba, Ctr Earth Observat Sci, Winnipeg, MB, Canada
[2] Finnish Meteorol Inst, FIN-00101 Helsinki, Finland
[3] Natl Oceanog Ctr, Southampton, Hants, England
[4] Inst Marine Res, N-5024 Bergen, Norway
[5] Arctic & Antarctic Res Inst, St Petersburg 199226, Russia
[6] Univ Alaska, Int Arctic Res Ctr, Fairbanks, AK 99701 USA
[7] Alfred Wegener Inst Polar & Marine Res, Bremerhaven, Germany
基金
加拿大自然科学与工程研究理事会; 英国自然环境研究理事会; 美国国家科学基金会;
关键词
BARENTS SEA; FRESH-WATER; CIRCULATION MODEL; BOUNDARY CURRENT; EURASIAN BASIN; VARIABILITY; HEAT; INTERMEDIATE; ADVECTION; FLUXES;
D O I
10.1002/2015JC010804
中图分类号
P7 [海洋学];
学科分类号
0707 ;
摘要
The Atlantic Water flow from the Barents and Kara seas to the Arctic Ocean through the St. Anna Trough (SAT) is conditioned by interaction between Fram Strait branch water circulating in the SAT and Barents Sea branch water-both of Atlantic origin. Here we present data from an oceanographic mooring deployed on the eastern flank of the SAT from September 2009 to September 2010 as well as CTD (conductivity-temperature-depth) sections across the SAT. A distinct vertical density front over the SAT eastern slope deeper than similar to 50 m is attributed to the outflow of Barents Sea branch water to the Arctic Ocean. In turn, the Barents Sea branch water flow to the Arctic Ocean is conditioned by two water masses defined by relative low and high fractions of the Atlantic Water. They are also traceable in the Nansen Basin downstream of the SAT entrance. A persistent northward current was recorded in the subsurface layer along the SAT eastern slope with a mean velocity of 18 cm s(-1) at 134-218 m and 23 cm s(-1) at 376-468 m. Observations and modeling suggest that the SAT flow has a significant density-driven component. It is therefore expected to respond to changes in the cross-trough density gradient conditioned by interaction between the Fram Strait and Barents Sea branches. Further modeling efforts are necessary to investigate hydrodynamic instability and eddy generation caused by the interaction between the SAT flow and the Arctic Ocean Fram Strait branch water boundary current.
引用
收藏
页码:5158 / 5178
页数:21
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