Response of Total and Eddy Kinetic Energy to the Recent Spinup of the Beaufort Gyre

Regan, Heather; Lique, Camille; Talandier, Claude; Meneghello, Gianluca

doi:10.1175/jpo-d-19-0234.1

Cited by 35 publications

(54 citation statements)

References 87 publications

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“…The EKE in Exp4km is very similar to that in a simulation using 3–4‐km resolution analyzed by Regan et al. (2020) (The EKE diagnosed as they did is shown and explained in Figure S2). In the following, we will investigate the spatial and seasonal variation of Arctic EKE in the 1‐km resolution simulation.…”

Section: Resultssupporting

confidence: 84%

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Eddy Kinetic Energy in the Arctic Ocean From a Global Simulation With a 1‐km Arctic

Wang

Koldunov

Danilov

et al. 2020

Geophysical Research Letters

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Simulating Arctic Ocean mesoscale eddies in ocean circulation models presents a great challenge because of their small size. This study employs an unstructured‐mesh ocean‐sea ice model to conduct a decadal‐scale global simulation with a 1‐km Arctic. It provides a basinwide overview of Arctic eddy energetics. Increasing model resolution from 4 to 1 km increases Arctic eddy kinetic energy (EKE) and total kinetic energy (TKE) by about 40% and 15%, respectively. EKE is the highest along main currents over topography slopes, where strong conversion from available potential energy to EKE takes place. It is high in halocline with a maximum typically centered in the depth range of 70–110 m, and in the Atlantic Water layer of the Eurasian Basin as well. The seasonal variability of EKE along the continental slopes of southern Canada and eastern Eurasian basins is similar, stronger in fall and weaker in spring.

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Section: Resultssupporting

confidence: 84%

“…In the past, EKE inside the Arctic Ocean has been discussed based on model simulations with 9 km (Maslowski et al., 2008) and 3–4 km (Regan et al., 2020) resolutions. The analysis of Maslowski et al.…”

Section: Introductionmentioning

confidence: 99%

Eddy Kinetic Energy in the Arctic Ocean From a Global Simulation With a 1‐km Arctic

Wang

Koldunov

Danilov

et al. 2020

Geophysical Research Letters

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“…The large-scale atmospheric pattern during T1 depicts an Arctic dipole pattern, the second mode of variability in the Arctic with a high pressure over the western Arctic and low pressure over eastern Arctic. The dominance of the AD during T1 (Figure 3a) maintained the BH, a semi-permanent atmospheric circulation pattern, which is well-known to drive the anticyclonic circulation of BG [58]. The resulting Ekman convergence stores the sea-ice and fresh water in the region.…”

Section: Discussionmentioning

confidence: 89%

Arctic Sea Level Budget Assessment during the GRACE/Argo Time Period

et al. 2020

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Sea level change is an important indicator of climate change. Our study focuses on the sea level budget assessment of the Arctic Ocean using: (1) the newly reprocessed satellite altimeter data with major changes in the processing techniques; (2) ocean mass change data derived from GRACE satellite gravimetry; (3) and steric height estimated from gridded hydrographic data for the GRACE/Argo time period (2003–2016). The Beaufort Gyre (BG) and the Nordic Seas (NS) regions exhibit the largest positive trend in sea level during the study period. Halosteric sea level change is found to dominate the area averaged sea level trend of BG, while the trend in NS is found to be influenced by halosteric and ocean mass change effects. Temporal variability of sea level in these two regions reveals a significant shift in the trend pattern centered around 2009–2011. Analysis suggests that this shift can be explained by a change in large-scale atmospheric circulation patterns over the Arctic. The sea level budget assessment of the Arctic found a residual trend of more than 1.0 mm/yr. This nonclosure of the sea level budget is further attributed to the limitations of the three above mentioned datasets in the Arctic region.

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“…Fram Strait sea ice export is the largest dynamic sink of the Arctic freshwater cycle. The increase in Fram Strait sea ice export detected from long-term monitoring of sea ice area has been suspected as the cause of Arctic sea ice volume loss, in particular for the multiyear thick sea ice within the Arctic Ocean (Smedsrud et al, 2017;Ricker et al, 2018). Using the more recent sea ice thickness retrievals, Spreen et al (2020) actually showed that in volume, the Fram Strait export has in fact been decreasing at 27 % per decade over 1992-2014, on par with the Fram Strait and Arctic ice thickness.…”

Section: Sea Icementioning

confidence: 99%

Freshwater in the Arctic Ocean 2010–2019

Solomon

Heuzé²,

Rabe

et al. 2021

Ocean Sci.

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Abstract. The Arctic climate system is rapidly transitioning into a new regime with a reduction in the extent of sea ice, enhanced mixing in the ocean and atmosphere, and thus enhanced coupling within the ocean–ice–atmosphere system; these physical changes are leading to ecosystem changes in the Arctic Ocean. In this review paper, we assess one of the critically important aspects of this new regime, the variability of Arctic freshwater, which plays a fundamental role in the Arctic climate system by impacting ocean stratification and sea ice formation or melt. Liquid and solid freshwater exports also affect the global climate system, notably by impacting the global ocean overturning circulation. We assess how freshwater budgets have changed relative to the 2000–2010 period. We include discussions of processes such as poleward atmospheric moisture transport, runoff from the Greenland Ice Sheet and Arctic glaciers, the role of snow on sea ice, and vertical redistribution. Notably, sea ice cover has become more seasonal and more mobile; the mass loss of the Greenland Ice Sheet increased in the 2010s (particularly in the western, northern, and southern regions) and imported warm, salty Atlantic waters have shoaled. During 2000–2010, the Arctic Oscillation and moisture transport into the Arctic are in-phase and have a positive trend. This cyclonic atmospheric circulation pattern forces reduced freshwater content on the Atlantic–Eurasian side of the Arctic Ocean and freshwater gains in the Beaufort Gyre. We show that the trend in Arctic freshwater content in the 2010s has stabilized relative to the 2000s, potentially due to an increased compensation between a freshening of the Beaufort Gyre and a reduction in freshwater in the rest of the Arctic Ocean. However, large inter-model spread across the ocean reanalyses and uncertainty in the observations used in this study prevent a definitive conclusion about the degree of this compensation.

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Response of Total and Eddy Kinetic Energy to the Recent Spinup of the Beaufort Gyre

Cited by 35 publications

References 87 publications

Eddy Kinetic Energy in the Arctic Ocean From a Global Simulation With a 1‐km Arctic

Eddy Kinetic Energy in the Arctic Ocean From a Global Simulation With a 1‐km Arctic

Arctic Sea Level Budget Assessment during the GRACE/Argo Time Period

Freshwater in the Arctic Ocean 2010–2019

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