On the Seasonal Cycles Observed at the Continental Slope of the Eastern Eurasian Basin of the Arctic Ocean

被引:19
作者
Baumann, Till M. [1 ,2 ]
Polyakov, Igor V. [1 ,2 ]
Pnyushkov, Andrey V. [1 ]
Rember, Robert [1 ]
Ivanov, Vladimir V. [3 ,4 ,5 ]
Alkire, Matthew B. [6 ]
Goszczko, Ilona [7 ]
Carmack, Eddy C. [8 ]
机构
[1] Univ Alaska Fairbanks, Int Arctic Res Ctr, Fairbanks, AK 99775 USA
[2] Univ Alaska Fairbanks, Coll Nat Sci & Math, Fairbanks, AK 99775 USA
[3] Moscow MV Lomonosov State Univ, Moscow, Russia
[4] Hydrometeorol Ctr Russia, Moscow, Russia
[5] Arctic & Antarctic Res Inst, St Petersburg, Russia
[6] Univ Washington, Appl Phys Lab, Polar Sci Ctr, Seattle, WA 98105 USA
[7] Polish Acad Sci, Inst Oceanol, Sopot, Poland
[8] Inst Ocean Sci Fisheries & Oceans Canada, Sidney, BC, Canada
基金
美国海洋和大气管理局; 美国国家科学基金会;
关键词
Ocean; Arctic; Water masses; Seasonal cycle; LOWER HALOCLINE WATER; ATLANTIC WATER; BOUNDARY CURRENT; COASTAL CURRENT; LAPTEV SEA; VARIABILITY; LAYER; EVOLUTION; HEAT; PERSPECTIVE;
D O I
10.1175/JPO-D-17-0163.1
中图分类号
P7 [海洋学];
学科分类号
0707 ;
摘要
The Eurasian Basin (EB) of the Arctic Ocean is subject to substantial seasonality. We here use data collected between 2013 and 2015 from six moorings across the continental slope in the eastern EB and identify three domains, each with its own unique seasonal cycle: 1) The upper ocean (<100 m), with seasonal temperature and salinity differences of = 0.16 degrees C and S = 0.17, is chiefly driven by the seasonal sea ice cycle. 2) The upper-slope domain is characterized by the influence of a hydrographic front that spans the water column around the similar to 750-m isobath. The domain features a strong temperature and moderate salinity seasonality ( = 1.4 degrees C; S = 0.06), which is traceable down to similar to 600-m depth. Probable cause of this signal is a combination of along-slope advection of signals by the Arctic Circumpolar Boundary Current, local wind-driven upwelling, and a cross-slope shift of the front. 3) The lower-slope domain, located offshore of the front, with seasonality in temperature and salinity mainly confined to the halocline ( = 0.83 degrees C; S = 0.11; similar to 100-200 m). This seasonal cycle can be explained by a vertical isopycnal displacement (Z similar to 36 m), arguably as a baroclinic response to sea level changes. Available long-term oceanographic records indicate a recent amplification of the seasonal cycle within the halocline layer, possibly associated with the erosion of the halocline. This reduces the halocline's ability to isolate the ocean surface layer and sea ice from the underlying Atlantic Water heat with direct implications for the evolution of Arctic sea ice cover and climate.
引用
收藏
页码:1451 / 1470
页数:20
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