Thermochaline Convection in the Edge-Ice Zone in the Barents Sea to the East of Spitsbergen

Kushnir, Vladimir; Hansen, Edmond; Pavlov, Vladimir; Morozov, A. N.

doi:10.1023/b:poce.0000013233.69589.d1

Cited by 3 publications

(5 citation statements)

References 19 publications

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“…(3). Some features of such structures and their agreement with Turner's model are considered in [31].…”

Section: Introductionmentioning

confidence: 99%

“…The parameterization of the vertical temperature flux in a zone of contact AtW and ArW can be presented as follows [7,8,12,13,31,38]:…”

Section: The Development Of a Convective In-stabilitymentioning

confidence: 99%

“…The formation of convective layers in lakes, seas and oceans, where temperature and salinity increase with depth, have been demonstrated in [23][24][25][26][27][28][29][30][31][32][33][34][35][36] Thermohaline structures with uniform layers with thicknesses from 5 -7 m up to 70 -80 m were found on many CTD-stations in the ice edge zone near Svalbard. Examples are shown in Fig.…”

Section: Introductionmentioning

confidence: 99%

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Convective Instability in the Ice Edge Area of the Barents Sea

Kushnir¹,

Pavlov²,

Morozov³

et al. 2008

TOOCEAJ

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Abstract:The ice edge of the Barents Sea east of Svalbard is an area where the warm, salty water of the North Atlantic (AtW) interacts with cold, less dense, saline Arctic water (ArW) and the water produced by melting ice (MIW). Many of the CTD profiles (CTD stands for Conductivity-Temperature-Depth) obtained in this region by Norwegian Polar Institute expeditions in 1999 and 2007 contain layers that are quasi-homogeneous in temperature, salinity and density between the depths of 5-7 m to 100-150 m. It is shown that these features are formed by convective instability due to double-diffusion, which can occur where there are positive vertical gradients of both temperature and salinity, as is observed in this region. The rate of development and the thickness of the gradient layer depend on vertical temperature and salinity drops in the zone of interaction of AtW with ArW and MIW. They correspond well, characterized by a correlation coefficient of 0.96.

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“…(3). Some features of such structures and their agreement with Turner's model are considered in [31].…”

Section: Introductionmentioning

confidence: 99%

“…The parameterization of the vertical temperature flux in a zone of contact AtW and ArW can be presented as follows [7,8,12,13,31,38]:…”

Section: The Development Of a Convective In-stabilitymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Convective Instability in the Ice Edge Area of the Barents Sea

Kushnir¹,

Pavlov²,

Morozov³

et al. 2008

TOOCEAJ

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“…Autumn-winter convection starts in late August -early September and penetrates into the water column at the velocity of ∼ 1.25 m/day. By early October, the temperature is almost constant throughout the depth [19], and such situation persists until the end of April. The temperature starts to increase at the end of the polar night.…”

Section: -2009 (Norwegian Component Of the Ecosystem Studies Of Subarmentioning

confidence: 99%

Polar Frontal Zone of the Barents Sea Western Trough Based on the Direct Measurements in 2007

Morozov¹,

Pavlov²,

Pavlova³

et al. 2017

PhO

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The results of measurements carried out in summer, 2007 in the northwestern part of the Barents Sea are discussed. The ship weather station and the vessel mounted Acoustic Doppler current profiler VMADCP150 are used to carry out measurements in the vessel motion. CTD/LADCP-sensing is performed at the drift stations. The minimum horizontal scale of a temperature front is 0.5 km, whereas the maximum horizontal gradient of water temperature is 4 °C/km. The width of the North Cape Current Northern branch is ~ 8 km that is three times larger than the Rossby radius of deformation. Position of the temperature front coincides with that of the jet stream core. The characteristics of small-scale vertical structure of water dynamics and density stratification in the polar frontal zone are discussed. The averaged annual variability of temperature and salinity vertical structure in the area of the Spitsbergen Bank and the Hopen Deep are represented. The intra-annual variability of water salinity in the Hopen Deep calculated based on the historical database of hydrological data, revealed the presence of variations with a period of four months. Based on satellite observations, position of the temperature front in the area of research is defined.

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“…Fronts, including the PFZ, are sites of high biological productivity and concentrations of food organisms, and are important The above factors explain why there is such interest in studying the PFZ in the Barents Sea. Many scientific studies have been carried out, resulting in a large number of published works, for example the papers [1][2][3][4][5][6][7][8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

“Flashes” of Chlorophyll-a Concentration Derived from in Situ and Remote Sensing Data at the Polar Front in the Barents Sea

Kushnir¹

2011

TOOCEAJ

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The Polar Front Zone (PFZ) in the Barents Sea is an area where warm, salty water of the North Atlantic (AtW) interacts with cold, less dense, Arctic water (ArW) and the fresher water produced by melting ice (MW). In the spring a large-scale transformation of the structure of the PFZ is accompanied by the development of mesoscale eddies with characteristic sizes of 25 to 40 km. The vertical velocity in the centre of such cyclonic eddies can be up to 20 m/day, transporting deep water with high nutrient concentration up to the surface. Photosynthesis at the surface leads to intense phytoplankton development, which is registered by the color scanners of SeaWiFS and MODIS as a sharp increase, or "flash," in chlorophyll-a concentration. A statistical analysis of such flashes for the last 11 years has shown that the most probable time for their occurrence is the last week of May. Maxima of the chlorophyll-a concentration have a Rayleigh distribution with a mean of 3.82 3 m / mg and a standard deviation of 1.98 3 m / mg. The characteristic sizes of the areas where a flash occurs correspond to the size of mesoscale eddies determined from estimations of the internal Rossby deformation radius. The positions of these eddies, observed by the R/V "Lance" survey coincide with the zones of high chlorophyll-a concentration seen in the data from the optical scanner of SeaWiFS.

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Thermochaline Convection in the Edge-Ice Zone in the Barents Sea to the East of Spitsbergen

Cited by 3 publications

References 19 publications

Convective Instability in the Ice Edge Area of the Barents Sea

Convective Instability in the Ice Edge Area of the Barents Sea

Polar Frontal Zone of the Barents Sea Western Trough Based on the Direct Measurements in 2007

“Flashes” of Chlorophyll-a Concentration Derived from in Situ and Remote Sensing Data at the Polar Front in the Barents Sea

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