Structure and dynamics of mesoscale eddies over the Laptev Sea
continental slope in the Arctic Ocean

Pnyushkov, Andrey V.; Polyakov, Igor V.; Padman, Laurie; Nguyen, An

doi:10.5194/os-2018-22

Cited by 3 publications

(11 citation statements)

References 38 publications

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“…The ACBC in the eastern part of the EB is subject to strong temporal variability evident in both current speed and direction (Pnyushkov et al, 2015). Our analysis shows no exception, and strong variability of current directions is evident in the velocity records from the mooring array collected in 2013-2015.…”

Section: Persistence Of Current Velocitiesmentioning

confidence: 53%

“…Unfortunately, we cannot verify the changes in these AW forcings along the EB slope to the east of St. Anna Trough, as there are no long-term observations of boundary current velocities that can be used for the assessment of ACBC transports. Observations of currents at several sites near Novaya Zemlya and the central Laptev Sea slopes in 2002-2012 have been derived from single moorings; these are not suitable for transport calculations, even if the period of observations was long enough to provide insight for the long-term structure of the boundary current there (e.g., Pnyushkov et al, 2013Pnyushkov et al, , 2015. However, in the eastern part of the EB, at the junction of the Lomonosov Ridge with the continental slope, Woodgate et al (2001) estimated water transports using year-long velocity mooring records from 1995-1996.…”

Section: Aw Transportsmentioning

confidence: 99%

“…4.1). This dataset was used, for example, in previous studies of long-term changes in the thermohaline state of the EB (Polyakov et al, 2008(Polyakov et al, , 2012 and the structure of the ACBC (Pnyushkov et al, 2015). We note that the dataset was recently updated with CTD observations from two shipbased surveys, which accompanied the deployments and recoveries of moorings in 2013 and 2015 (see NABOS web page at nabos.iarc.uaf.edu), and ice-tethered profiler (ITP) data (available at http://www.whoi.edu/page.do?pid=20756, last access: March 2018).…”

Section: Mooring Observations and Ctd Surveysmentioning

confidence: 99%

“…For estimates of the cross-sectional baroclinic geostrophic velocities (geostrophic shear velocities; u s ), we applied the thermal wind equations to the 2013-2015 mean potential densities provided by mooring measurements. The same method was implemented in our previous studies of the structure and variability of the ACBC at the Laptev Sea slope (see Pnyushkov et al, 2013Pnyushkov et al, , 2015. In these calculations, however, we do not assume a level of no motion because during the 2013-2015 period, the mean velocity profiles show no evident levels with zero velocities.…”

Section: Geostrophic Currentsmentioning

confidence: 99%

“…According to the PHC dataset, the Fram Strait branch of the AW spans the layer between ∼ 180 and ∼ 750 m (determined by the position of 0 • C isotherm), but for some years, the lower AW boundary determined using measured conductivitytemperature-depth (CTD) profiles can be found significantly deeper at ∼ 1000-1200 m (see, for example, Fig. 7 in Pnyushkov et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

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Heat, salt, and volume transports in the eastern Eurasian Basin of the Arctic Ocean from 2 years of mooring observations

et al. 2018

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Abstract. This study discusses along-slope volume, heat, and salt transports derived from observations collected in 2013–2015 using a cross-slope array of six moorings ranging from 250 to 3900 m in the eastern Eurasian Basin (EB) of the Arctic Ocean. These observations demonstrate that in the upper 780 m layer, the along-slope boundary current advected, on average, 5.1±0.1 Sv of water, predominantly in the eastward (shallow-to-right) direction. Monthly net volume transports across the Laptev Sea slope vary widely, from ∼0.3±0.8 in April 2014 to ∼9.9±0.8 Sv in June 2014; 3.1±0.1 Sv (or 60 %) of the net transport was associated with warm and salty intermediate-depth Atlantic Water (AW). Calculated heat transport for 2013–2015 (relative to −1.8 ∘C) was 46.0±1.7 TW, and net salt transport (relative to zero salinity) was 172±6 Mkg s−1. Estimates for AW heat and salt transports were 32.7±1.3 TW (71 % of net heat transport) and 112±4 Mkg s−1 (65 % of net salt transport). The variability of currents explains ∼90 % of the variability in the heat and salt transports. The remaining ∼10 % is controlled by temperature and salinity anomalies together with the temporal variability of the AW layer thickness. The annual mean volume transports decreased by 25 % from 5.8±0.2 Sv in 2013–2014 to 4.4±0.2 Sv in 2014–2015, suggesting that changes in the transports at interannual and longer timescales in the eastern EB may be significant.

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Section: Persistence Of Current Velocitiesmentioning

confidence: 53%

Section: Aw Transportsmentioning

confidence: 99%

Section: Mooring Observations and Ctd Surveysmentioning

confidence: 99%

Section: Geostrophic Currentsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Heat, salt, and volume transports in the eastern Eurasian Basin of the Arctic Ocean from 2 years of mooring observations

et al. 2018

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Eddies and the distribution of eddy kinetic energy in the Arctic Ocean

Appen

Baumann

Janout

et al. 2022

Preprint

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<p>Mesoscale eddies are important for many aspects of the dynamics of the Arctic Ocean. These include the maintenance of the halocline and the Atlantic Water boundary current through lateral eddy fluxes, shelf-basin exchanges, transport of biological material and sea ice, and the modification of the sea-ice distribution. Here we review what is known about the mesoscale variability and its impacts in the Arctic Ocean in the context of an Arctic Ocean responding rapidly to climate change. In addition, we present the first quantification of eddy kinetic energy (EKE) from moored observations across the entire Arctic Ocean, which we compare to output from an eddy resolving numerical model. We show that EKE is largest in the northern Nordic Seas/Fram Strait and it is also elevated along the shelfbreak of the Arctic Circumpolar Boundary Current, especially in the Beaufort Sea. In the central basins it is 100-1000 times lower. Except for the region affected by southward sea-ice export south of Fram Strait, EKE is stronger when sea-ice concentration is low compared to dense ice cover. Areas where conditions typical in the Atlantic and Pacific prevail will increase. Hence, we conclude that the future Arctic Ocean will feature more energetic mesoscale variability.</p>

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Eddies and the Distribution of Eddy Kinetic Energy in the Arctic Ocean

Appen¹,

Baumann²,

Janout³

et al. 2022

Oceanog

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Mesoscale eddies are important to many aspects of the dynamics of the Arctic Ocean. Among others, they maintain the halocline and interact with the Atlantic Water circumpolar boundary current through lateral eddy fluxes and shelf-basin exchanges. Mesoscale eddies are also important for transporting biological material and for modifying sea ice distribution. Here, we review what is known about eddies and their impacts in the Arctic Ocean in the context of rapid climate change. Eddy kinetic energy (EKE) is a proxy for mesoscale variability in the ocean due to eddies. We present the first quantification of EKE from moored observations across the entire Arctic Ocean and compare those results to output from an eddy resolving numerical model. We show that EKE is largest in the northern Nordic Seas/Fram Strait and it is also elevated along the shelf break of the Arctic Circumpolar Boundary Current, especially in the Beaufort Sea. In the central basins, EKE is 100–1,000 times lower. Generally, EKE is stronger when sea ice concentration is low versus times of dense ice cover. As sea ice declines, we anticipate that areas in the Arctic Ocean where conditions typical of the North Atlantic and North Pacific prevail will increase. We conclude that the future Arctic Ocean will feature more energetic mesoscale variability.

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Structure and dynamics of mesoscale eddies over the Laptev Sea continental slope in the Arctic Ocean

Abstract: Abstract. Heat fluxes steered by mesoscale eddies may be a significant (but still not quantified) source of heat to the surface mixed layer and sea ice cover in the Arctic Ocean, as well as a source of nutrients for enhancing seasonal productivity in the

Cited by 3 publications

References 38 publications

Heat, salt, and volume transports in the eastern Eurasian Basin of the Arctic Ocean from 2 years of mooring observations

Heat, salt, and volume transports in the eastern Eurasian Basin of the Arctic Ocean from 2 years of mooring observations

Eddies and the distribution of eddy kinetic energy in the Arctic Ocean

Eddies and the Distribution of Eddy Kinetic Energy in the Arctic Ocean

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