The impact of resolution on the representation of southeast Greenland barrier winds and katabatic flows

Moore, G. W. K.; Renfrew, Ian A.; Harden, Benjamin E.; Mernild, Sebastian H.

doi:10.1002/2015gl063550

Cited by 43 publications

(57 citation statements)

References 31 publications

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“…This occurred on scales too small to be resolved by global reanalysis products, which implies that coarsely resolved models underestimate ocean circulation and heat fluxes during storm events and hence underlines the need for high‐resolution studies in dynamic areas such as the northwest Laptev Sea. Similar conclusions were reached for other high‐latitude regions, such as around Greenland [ Moore et al ., ] and Novaya Zemlya [ Moore , ].…”

Section: Resultssupporting

confidence: 88%

Circulation in the northwest Laptev Sea in the eastern Arctic Ocean: Crossroads between Siberian River water, Atlantic water and polynya‐formed dense water

et al. 2017

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This paper investigates new observations from the poorly understood region between the Kara and Laptev Seas in the Eastern Arctic Ocean. We discuss relevant circulation features including riverine freshwater, Atlantic‐derived water, and polynya‐formed dense water, emphasize Vilkitsky Strait (VS) as an important Kara Sea gateway, and analyze the role of the adjacent ∼250 km‐long submarine Vilkitsky Trough (VT) for the Arctic boundary current. Expeditions in 2013 and 2014 operated closely spaced hydrographic transects and 1 year‐long oceanographic mooring near VT's southern slope, and found persistent annually averaged flow of 0.2 m s−1 toward the Nansen Basin. The flow is nearly barotropic from winter through early summer and becomes surface intensified with maximum velocities of 0.35 m s−1 from August to October. Thermal wind shear is maximal above the southern flank at ∼30 m depth, in agreement with basinward flow above VT's southern slope. The subsurface features a steep front separating warm (–0.5°C) Atlantic‐derived waters in central VT from cold (<–1.5°C) shelf waters, which episodically migrates across the trough indicated by current reversals and temperature fluctuations. Shelf‐transformed waters dominate above VT's slope, measuring near‐freezing temperatures throughout the water column at salinities of 34–35. These dense waters are vigorously advected toward the Eurasian Basin and characterize VT as a conduit for near‐freezing waters that could potentially supply the Arctic Ocean's lower halocline, cool Atlantic water, and ventilate the deeper Arctic Ocean. Our observations from the northwest Laptev Sea highlight a topographically complex region with swift currents, several water masses, narrow fronts, polynyas, and topographically channeled storms.

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Section: Resultssupporting

confidence: 88%

Circulation in the northwest Laptev Sea in the eastern Arctic Ocean: Crossroads between Siberian River water, Atlantic water and polynya‐formed dense water

et al. 2017

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“…The evidence of underestimation of wind speeds during MCAOs in reanalysis products abounds. Substantial improvements in the representation wind speeds have been shown for the first version (Δ = 30 km) of the Arctic System Reanalysis (ASRv1 henceforth; Bromwich et al, 2016) for several small-scale features, including southeast Greenland barrier winds and katabatic flows (Moore et al, 2015). Even better results have been demonstrated for the second version of the Arctic System Reanalysis (ASRv2), for which Δ = 15 km, in a study of topographically forced winds near Greenland , tip jets included.…”

Section: Introductionmentioning

confidence: 73%

Higher Ocean Wind Speeds During Marine Cold Air Outbreaks

Kolstad¹

2017

Preprint

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Marine cold air outbreaks (MCAOs) are large-scale events in which cold air masses are advected over open ocean. It is well-known that these events are linked to the formation of polar lows and other mesoscale phenomena associated with high wind speeds, and that they therefore in some cases represent a hazard to maritime activities. However, it is still unknown whether MCAOs are generally conducive to higher wind speeds than normal. Here this is investigated by comparing ocean near-surface wind speeds during MCAOs in atmospheric reanalysis products with different horizontal grid spacings, along with two case studies using a convection-permitting numerical weather prediction model. The study regions are the Labrador Sea and the Greenland-Iceland-Norwegian (GIN) Seas, where MCAOs have been shown to be important for air-sea interaction and deep water formation. One of the main findings is that wind speeds during the strongest MCAO events are higher than normal and higher than wind speeds during less severe events. Limited evidence from the case studies suggests that reanalyses with grid spacings of more than 50 km underestimate winds driven by the large ocean-atmosphere energy fluxes during MCAOs. The peak times of MCAO usually occur when baroclinic waves pass over the regions. Therefore, the strong wind episodes during MCAOs generally last for just a few days. However, MCAOs can persist for 50 days or more.

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“…Such cycles have been predicted on the basis of models of internal ice sheet variability (Bugelmayer-Blaschek et al, 2016), but also could be associated with periods of enhanced melting of drift ice in Denmark Strait at the marine polar front or surges in icebergs released to Denmark Strait from siqussaq break-up in the fjords (Straneo and Heimbach, 2013;Moore and Renfrew, 2014).…”

Section: Sediment Coresmentioning

confidence: 95%

“…Strong katabatic winds off the ice sheet may break up the siqussaq and release the icebergs from the fjords into the EGC (Straneo and Heimbach, 2013;Moore and Renfrew, 2014). The offshore sea ice covers the site of 2322 for 6.5 to 8.5 months per yr (Jennings et al, 2011).…”

Section: Oceanographic Circulation and Environmentmentioning

confidence: 99%

Timber Logging in Central Siberia is the Main Source for Recent Arctic Driftwood

Hellmann

Tegel

Kirdyanov

et al. 2015

Arctic, Antarctic, and Alpine Research

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The impact of resolution on the representation of southeast Greenland barrier winds and katabatic flows

Cited by 43 publications

References 31 publications

Circulation in the northwest Laptev Sea in the eastern Arctic Ocean: Crossroads between Siberian River water, Atlantic water and polynya‐formed dense water

Circulation in the northwest Laptev Sea in the eastern Arctic Ocean: Crossroads between Siberian River water, Atlantic water and polynya‐formed dense water

Higher Ocean Wind Speeds During Marine Cold Air Outbreaks

Timber Logging in Central Siberia is the Main Source for Recent Arctic Driftwood

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