Combined influence of oceanic and atmospheric circulations on Greenland sea ice concentration

Chatterjee, Sourav; Raj, Roshin P.; Bertino, Laurent; Mernild, Sebastian H.; Subeesh, M.P.; Murukesh, Nuncio; Ravichandran, M.

doi:10.5194/tc-15-1307-2021

Cited by 8 publications

(8 citation statements)

References 49 publications

(76 reference statements)

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“…However, its intensity is gradually reduced. With global warming, sea ice melting has accelerated in the Pan-Arctic region 21,22 . The sea ice concentration with the minimum sea ice area in selected years is shown in Fig.…”

Section: Resultsmentioning

confidence: 99%

Spatio-Temporal Analysis of Summer Salinity Fronts in the Greenland Sea

Wang¹,

Liu²,

Han³

et al. 2021

Preprint

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Using daily average data from the global ocean eddy resolution reanalysis product (GLORYS12V1) from 1993 to 2018, sea surface salinity horizontal gradient is calculated to obtain the spatio-temporal distribution and the intensity characteristics of the salinity front in the Greenland Sea. Combined with the sea ice concentration data, the salinity front and sea ice relationship is also studied. There is a significant spatial relationship between the main position of the salinity front and the ice edge before the sea ice shrinks toward the continental shelf. In the climatological seasonal variation, the intensity of the salinity front beyond the continental shelf reaches its strongest (~0.22 psu/km) in July. The front area beyond the continental shelf reaches its peak value (~7.80×104 km2) in August. The interannual variation of sea ice extent averaged from July to August has a downward trend of 5.83×103 km2/year. Under the background of rapid change in sea ice, the intensity and area of the salinity front beyond the continental shelf are reducing at about 1.7×10-3 psu/km and 142 km2 /year, respectively.

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Section: Resultsmentioning

confidence: 99%

Spatio-Temporal Analysis of Summer Salinity Fronts in the Greenland Sea

Wang¹,

Liu²,

Han³

et al. 2021

Preprint

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“…The relationship between GSG strength and transport of AW has previously been revealed through seawater temperature fluctuations by Chatterjee et al (2018). In the vertical aspect, as the GSG becomes stronger, the stratification is weakened, and the vertically mixed AW occupies the subsurface instead of the cold and fresh water inside the GSG (Chatterjee et al, 2021).…”

Section: Sea Surface Currentmentioning

confidence: 99%

Variability of Near-Surface Salinity in the Nordic Seas Over the Past Three Decades (1991-2019)

Park

Kim²,

Cho³

2022

Front. Mar. Sci.

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The Nordic Seas have been widely implicated by deep water formation as a part of Atlantic Meridional Overturning Circulation. This study explores the spatiotemporal variations in the near-surface salinity over the Nordic Seas associated with surface freshening factors by using monthly TOPAZ4 reanalysis data from 1991 to 2019. We first show that reliability of TOPAZ4 data compared to the salinity products of other reanalysis data, satellite data, and in-situ measurements in the Nordic Seas. The salinity variability was larger in the Greenland Sea (GS) than in the Norwegian Sea (NS) on both time scales of seasonal and interannual. The seasonal change of GS salinity was coincident with the seasonality of sea ice extent. The longer-time variations are decomposed by empirical orthogonal function (EOF) analysis. The GS salinity is mainly affected by current advection (29%) and sea ice extent (11%). The interannual response of salinity to the sea ice extent over the GS differs by season. NS salinity variability responds to the strength of the Subpolar Gyre associated with a large-scale atmospheric system that caused the freshening event in the mid-1990s. The propagation of the northward Atlantic Water core is observed over the period of about 3 years from the Faroe Shetland Channel to the Fram Strait at a speed of 2.6-6.5° year-1. Other freshening factors such as sea ice export from the Arctic, freshwater flux at the Fram Strait, and net precipitation are also discussed. For the past three decades, the continuous trend appeared only in the sea ice extent, which might be a signal of climate changes over high latitude. However, there was no significant trend other than the periodic change in a few years to the decadal time scale in the salinity of GS and NS. As preconditioning for deep convection, near-surface salinity within Greenland Sea Gyre was influenced by salinity fluctuation in both GS and NS.

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“…According to a study that used the Pan-Arctic Ice Ocean Modeling and Assimilation System, from 1979 to 2016, the loss of the overall sea ice volume in the Greenland Sea was 113 km 3 per decade (9.4 km 3 month −1 per decade) (Selyuzhenok et al, 2020). The ice conditions in the Greenland Sea are primarily regulated by the sea ice imported through the Fram Strait and by local sea ice variations (Selyuzhenok et al, 2020;Chatterjee et al, 2021). The sea ice area export shows considerable seasonal variations, with the maximum in March and the minimum in August (Smedsrud et al, 2017).…”

Section: Houssaismentioning

confidence: 99%

“…The positive wind stress curl strengthens the cyclonic Greenland Sea Gyre (GSG) circulation in the central Greenland Sea. Warm and saline AW are recirculated from the FS region to the southwestern Greenland Sea by a strong GSG circulation (Chatterjee et al, 2021). The increase in temperature in AW along the main currents of the Nordic Seas induces an increase in the oceanic heat content in the Greenland Sea (Selyuzhenok et al, 2020).…”

Section: Houssaismentioning

confidence: 99%

Spatio-temporal analysis of east greenland polar front

et al. 2022

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The East Greenland Polar Front (EGPF) is an important front with strong salinity and temperature gradients in the Nordic Seas. It is formed by the interaction between Arctic-origin and Atlantic-origin water. The variations of EGPF are closely linked with sea ice melting and heat content transport associated with North Atlantic water recirculation. For a three-dimensional (3D) daily analysis, we use the global ocean eddy resolution reanalysis product (GLORYS12V1) from 1993 to 2018 to calculate the salinity and temperature horizontal gradient in the upper ocean and obtain the spatiotemporal distribution and intensity characteristics of EGPF. After assessment, the thresholds of the salinity and temperature fronts are set to 0.04 psu/km and 0.09°C/km, respectively. Compared with satellite observations of sea ice concentration, a significant spatial relationship is observed between the main position of EGPF and the ice edge before the sea ice shrinks to the continental shelf sea area. Affected by the freshening of the Arctic-origin water due to the melting of the sea ice, the intensity and area of EGPF show significant seasonal variations. Against the background of global warming, the sea ice area presents an obvious decreasing trend in the Greenland Sea. The melting of sea ice increased annually every summer from 1998 to 2018. The heat content transport of the Atlantic-origin water has also increased in recent years. The 3D characteristics (intensity and volume) of EGPF as salinity and temperature fronts exhibit increasing trends.

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Combined influence of oceanic and atmospheric circulations on Greenland sea ice concentration

Cited by 8 publications

References 49 publications

Spatio-Temporal Analysis of Summer Salinity Fronts in the Greenland Sea

Spatio-Temporal Analysis of Summer Salinity Fronts in the Greenland Sea

Variability of Near-Surface Salinity in the Nordic Seas Over the Past Three Decades (1991-2019)

Spatio-temporal analysis of east greenland polar front

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