scholarly journals The Atlantic Water Boundary Current in the Chukchi Borderland and Southern Canada Basin

2020 ◽  
Vol 125 (8) ◽  
Author(s):  
Jianqiang Li ◽  
Robert S. Pickart ◽  
Peigen Lin ◽  
Frank Bahr ◽  
Kevin R. Arrigo ◽  
...  
Keyword(s):  
Atlantic Water ◽  
Canada Basin ◽  
Boundary Current ◽  
Chukchi Borderland

Atlantic Water Circulation in the Canada Basin

ARCTIC ◽  
1974 ◽  
Vol 27 (4) ◽  
Author(s):  
J.L. Newton ◽  
L.K. Coachman
Keyword(s):  
Atlantic Water ◽  
Water Circulation ◽  
Canada Basin

scholarly journals Structure, Transport, and Seasonality of the Atlantic Water Boundary Current North of Svalbard: Results From a Yearlong Mooring Array

2019 ◽  
Vol 124 (3) ◽  
pp. 1679-1698 ◽  
Author(s):  
M. Dolores Pérez‐Hernández ◽  
Robert S. Pickart ◽  
Daniel J. Torres ◽  
Frank Bahr ◽  
Arild Sundfjord ◽  
...  
Keyword(s):  
Atlantic Water ◽  
Boundary Current

scholarly journals Does the East Greenland Current exist in the northern Fram Strait?

Ocean Science ◽  
2018 ◽  
Vol 14 (5) ◽  
pp. 1147-1165 ◽  
Author(s):  
Maren Elisabeth Richter ◽  
Wilken-Jon von Appen ◽  
Claudia Wekerle
Keyword(s):  
Arctic Ocean ◽  
Atlantic Water ◽  
Shelf Break ◽  
The Arctic ◽  
Current Loop ◽  
Fram Strait ◽  
Boundary Current ◽  
East Greenland ◽  
East Greenland Current ◽  
The Arctic Ocean

Abstract. Warm Atlantic Water (AW) flows around the Nordic Seas in a cyclonic boundary current loop. Some AW enters the Arctic Ocean where it is transformed to Arctic Atlantic Water (AAW) before exiting through the Fram Strait. There the AAW is joined by recirculating AW. Here we present the first summer synoptic study targeted at resolving this confluence in the Fram Strait which forms the East Greenland Current (EGC). Absolute geostrophic velocities and hydrography from observations in 2016, including four sections crossing the east Greenland shelf break, are compared to output from an eddy-resolving configuration of the sea ice–ocean model FESOM. Far offshore (120 km at 80.8∘ N) AW warmer than 2 ∘C is found in the northern Fram Strait. The Arctic Ocean outflow there is broad and barotropic, but gets narrower and more baroclinic toward the south as recirculating AW increases the cross-shelf-break density gradient. This barotropic to baroclinic transition appears to form the well-known EGC boundary current flowing along the shelf break farther south where it has been previously described. In this realization, between 80.2 and 76.5∘ N, the southward transport along the east Greenland shelf break increases from roughly 1 Sv to about 4 Sv and the proportion of AW to AAW also increases fourfold from 19±8 % to 80±3 %. Consequently, in the southern Fram Strait, AW can propagate into the Norske Trough on the east Greenland shelf and reach the large marine-terminating glaciers there. High instantaneous variability observed in both the synoptic data and the model output is attributed to eddies, the representation of which is crucial as they mediate the westward transport of AW in the recirculation and thus structure the confluence forming the EGC.

Atlantic water north of Svalbard 1899-2018

2020 ◽  
Author(s):  
Marika Marnela ◽  
Frank Nilsen ◽  
Ragnheid Skogseth ◽  
Kjersti Kalhagen
Keyword(s):  
Historical Data ◽  
Saline Water ◽  
Atlantic Water ◽  
The Arctic ◽  
Boundary Current ◽  
Shelf Slope ◽  
Mean Width ◽  
Vertical Location ◽  
The Mean ◽  
West Spitsbergen

<p>As part of the Nansen Legacy project, waters north of Svalbard are studied. The warm and saline Atlantic water, brought northward by the West Spitsbergen Current cools and freshens as it flows eastward along the slope north of Svalbard, bringing heat and salt into the Arctic Ocean. Hydrographic CTD data are available from various cruises and databases, the main source here being the UNIS Hydrographic Database. Changes in the Atlantic water properties and its horizontal and vertical location on the slope and shelf are mapped from decadal averages of historical data from 1899 to 2018. The mean width of the boundary current following the slope eastward is estimated for five cross-shelf/slope sections from the decadal averages. An Atlantification is present from 1996-2005 to 2006-2018 with warmer and more saline water covering a larger area across the slope and reaching further east.</p>

scholarly journals The Atlantic Water boundary current north of Svalbard in late summer

2017 ◽  
Vol 122 (3) ◽  
pp. 2269-2290 ◽  
Author(s):  
M. Dolores Pérez-Hernández ◽  
Robert S. Pickart ◽  
Vladimir Pavlov ◽  
Kjetil Våge ◽  
Randi Ingvaldsen ◽  
...  
Keyword(s):  
Late Summer ◽  
Atlantic Water ◽  
Boundary Current

scholarly journals On the Circulation of Atlantic Water in the Arctic Ocean

2013 ◽  
Vol 43 (11) ◽  
pp. 2352-2371 ◽  
Author(s):  
Michael A. Spall
Keyword(s):  
Heat Flux ◽  
Numerical Model ◽  
Arctic Ocean ◽  
Surface Heat Flux ◽  
Atlantic Water ◽  
Surface Heat ◽  
The Arctic ◽  
Analytic Model ◽  
Boundary Current ◽  
The Arctic Ocean

Abstract An idealized eddy-resolving numerical model and an analytic three-layer model are used to develop ideas about what controls the circulation of Atlantic Water in the Arctic Ocean. The numerical model is forced with a surface heat flux, uniform winds, and a source of low-salinity water near the surface around the perimeter of an Arctic basin. Despite this idealized configuration, the model is able to reproduce many general aspects of the Arctic Ocean circulation and hydrography, including exchange through Fram Strait, circulation of Atlantic Water, a halocline, ice cover and transport, surface heat flux, and a Beaufort Gyre. The analytic model depends on a nondimensional number, and provides theoretical estimates of the halocline depth, stratification, freshwater content, and baroclinic shear in the boundary current. An empirical relationship between freshwater content and sea surface height allows for a prediction of the transport of Atlantic Water in the cyclonic boundary current. Parameters typical of the Arctic Ocean produce a cyclonic boundary current of Atlantic Water of O(1 − 2 Sv; where 1 Sv ≡ 106 m3 s−1) and a halocline depth of O(200 m), in reasonable agreement with observations. The theory compares well with a series of numerical model calculations in which mixing and environmental parameters are varied, thus lending credibility to the dynamics of the analytic model. In these models, lateral eddy fluxes from the boundary and vertical diffusion in the interior are important drivers of the halocline and the circulation of Atlantic Water in the Arctic Ocean.

scholarly journals The Atlantic Water boundary current in the Nansen Basin: Transport and mechanisms of lateral exchange

2016 ◽  
Vol 121 (9) ◽  
pp. 6946-6960 ◽  
Author(s):  
Kjetil Våge ◽  
Robert S. Pickart ◽  
Vladimir Pavlov ◽  
Peigen Lin ◽  
Daniel J. Torres ◽  
...  
Keyword(s):  
Atlantic Water ◽  
Boundary Current ◽  
Lateral Exchange

Turbulent mixing above the Atlantic Water around the Chukchi Borderland in 2014

2018 ◽  
Vol 37 (3) ◽  
pp. 31-41 ◽  
Author(s):  
Wenli Zhong ◽  
Guijun Guo ◽  
Jinping Zhao ◽  
Tao Li ◽  
Xiaoyu Wang ◽  
...  
Keyword(s):  
Turbulent Mixing ◽  
Atlantic Water ◽  
Chukchi Borderland

scholarly journals Modified Halocline Water over the Laptev Sea Continental Margin: Historical Data Analysis

2012 ◽  
Vol 25 (16) ◽  
pp. 5556-5565 ◽  
Author(s):  
Igor A. Dmitrenko ◽  
Sergey A. Kirillov ◽  
Vladimir V. Ivanov ◽  
Bert Rudels ◽  
Nuno Serra ◽  
...  
Keyword(s):  
Continental Margin ◽  
North Atlantic Ocean ◽  
Source Region ◽  
Vertical Mixing ◽  
Atlantic Water ◽  
Laptev Sea ◽  
Boundary Current ◽  
Salinity Stratification ◽  
The North ◽  
The Laptev Sea

Abstract Historical hydrographic data (1940s–2010) show a distinct cross-slope difference of the lower halocline water (LHW) over the Laptev Sea continental margins. Over the slope, the LHW is on average warmer and saltier by 0.2°C and 0.5 psu, respectively, relative to the off-slope LHW. The LHW temperature time series constructed from the on-slope historical records are related to the temperature of the Atlantic Water (AW) boundary current transporting warm water from the North Atlantic Ocean. In contrast, the on-slope LHW salinity is linked to the sea ice and wind forcing over the potential upstream source region in the Barents and northern Kara Seas, as also indicated by hydrodynamic model results. Over the Laptev Sea continental margin, saltier LHW favors weaker salinity stratification that, in turn, contributes to enhanced vertical mixing with underlying AW.

scholarly journals Inferring Circulation and Lateral Eddy Fluxes in the Arctic Ocean’s Deep Canada Basin Using an Inverse Method

2018 ◽  
Vol 48 (2) ◽  
pp. 245-260 ◽  
Author(s):  
Hayley V. Dosser ◽  
Mary-Louise Timmermans
Keyword(s):  
Inverse Method ◽  
Large Scale ◽  
Barents Sea ◽  
Function Analysis ◽  
Water Layer ◽  
Atlantic Water ◽  
Canada Basin ◽  
The Arctic ◽  
Central Basin ◽  
Beaufort Gyre

AbstractThe deep waters in the Canada Basin display a complex temperature and salinity structure, the evolution of which is poorly understood. The fundamental physical processes driving changes in these deep water masses are investigated using an inverse method based on tracer conservation combined with empirical orthogonal function analysis of repeat hydrographic measurements between 2003 and 2015. Changes in tracer fields in the deep Canada Basin are found to be dominated by along-isopycnal diffusion of water properties from the margins into the central basin, with advection by the large-scale Beaufort Gyre circulation as well as localized, vertical mixing playing important secondary roles. In the Barents Sea branch of the Atlantic Water layer, centered around 1200-m depth, diffusion is shown to be nearly twice as important as advection to lateral transport. Along-isopycnal diffusivity is estimated to be ~300–600 m2 s−1. Large-scale circulation patterns and lateral advective velocities associated with the anticyclonic Beaufort Gyre are inferred, with an average speed of 0.6 cm s−1. Below about 1500 m, along-isopycnal diffusivity is estimated to be ~200–400 m2 s−1.

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