Evolution of Denmark Strait Overflow Cyclones and Their Relationship to Overflow Surges

Almansi, Mattia; Haine, Thomas W. N.; Gelderloos, Renske; Pickart, Robert S.

doi:10.1029/2019gl086759

Cited by 12 publications

(9 citation statements)

References 40 publications

(73 reference statements)

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“…(2017), and updated as by Almansi et al. (2020). The horizontal domain covers 47°W–1°E and 57–76°N, discretized with an unevenly spaced grid with resolution of 2 km at the center and 4 km in peripheral areas (including our study area at Cape Farewell).…”

Section: Methodsmentioning

confidence: 99%

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Wind‐Driven Freshwater Export at Cape Farewell

2022

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Increased freshwater input to the Subpolar North Atlantic from Greenland ice melt and the Arctic could strengthen stratification in deep convection regions and impact the overturning circulation. However, freshwater pathways from the east Greenland shelf to deep convection regions are not fully understood. We investigate the role of strong wind events at Cape Farewell in driving surface freshwaters from the East Greenland Current to the Irminger Sea. Using a high‐resolution model and an atmospheric reanalysis, we identify strong wind events and investigate their impact on freshwater export. Westerly tip jets are associated with the strongest and deepest freshwater export across the shelfbreak, with a mean of 37.5 mSv of freshwater in the first 100 m (with reference salinity 34.9). These wind events tilt isohalines and extend the front offshore, especially over Eirik Ridge. Moderate westerly events are associated with weaker export across the shelfbreak (mean of 15.9 mSv) but overall contribute to more freshwater export throughout the year, including in summer, when the shelf is particularly fresh. Particle tracking shows that half of the surface waters crossing the shelfbreak during tip jet events are exported away from the shelf, either entering the Irminger Gyre, or being driven over Eirik Ridge. During strong westerly wind events, sea ice detaches from the coast and veers toward the Irminger Sea, but the contribution of sea ice to freshwater export at the shelfbreak is minimal compared to liquid freshwater export due to limited sea ice cover at Cape Farewell.

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Section: Methodsmentioning

confidence: 99%

“…Wind-driven freshwater export at Cape Farewell is investigated using results from a high-resolution simulation based on the Massachusetts Institute of Technology General Circulation Model (MITgcm; Marshall et al, 1997). The configuration and forcing are described by Almansi et al (2017), and updated as by Almansi et al (2020).…”

Section: Models and Datamentioning

confidence: 99%

Wind‐Driven Freshwater Export at Cape Farewell

2022

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“…The domain of this simulation (Almansi et al., 2020) is centered around the Denmark Strait, and covers the Irminger Sea, the Iceland Basin, and part of the Norwegian and Greenland Basins. The horizontal resolution (Figure 1b) varies between 2 km in the central part of the domain to 4 km near the boundaries.…”

Section: Methodsmentioning

confidence: 99%

“…For this study, we used a set of three numerical simulations. All simulations are hydrostatic regional ocean-sea ice configurations in the Massachusetts Institute of Technology general circulation model (MITgcm; Marshall et al, 1997), described in detail in previous work and shown to represent the regional ocean properties and dynamics faithfully (Almansi et al, 2017(Almansi et al, , 2020Foukal et al, 2020;Gelderloos et al, 2021;Håvik et al, 2019;Saberi et al, 2020;Spall et al, 2021). The representation of fjords specifically in these simulations has not been evaluated previously, and is part of this manuscript (Sections 3 and 4).…”

Section: Numerical Simulationsmentioning

confidence: 99%

Subinertial Variability in Four Southeast Greenland Fjords in Realistic Numerical Simulations

Gelderloos

Haine

Almansi³

2022

JGR Oceans

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We identified the nature and driving mechanisms of subinertial variability (variability at a time scale of several days) in four fjords in Southeast Greenland, in three high‐resolution numerical simulations. We find two dominant frequency ranges in along‐fjord velocity, volume transport of Atlantic Water, and along‐fjord heat transport: one around 2–4 days and one around 10 days. The higher frequency is most prominent in the two smaller fjords (Sermilik Fjord and Kangerdlugssuaq Fjord), while the lower frequency peak dominates in the larger fjords (Scoresby Sund and King Oscar Fjord). The cross‐fjord structure of variability patterns is determined by the fjord's dynamic width, while the vertical structure is determined by the stratification in the fjord. The dominant frequency range is a function of stratification and fjord length, through the travel time of resonant internal Kelvin waves. We find that the subinertial variability is the imprint of Coastal Trapped Waves, which manifest as Rossby‐type waves on the continental shelf and as internal Kelvin‐type waves inside the fjords. Between 50% and 80% of the variability in the fjord is directly forced by Coastal Trapped Waves propagating in from the shelf, with an additional role played by alongshore wind forcing on the shelf.

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“…We should avoid the inefficient practice in which users are forced to download voluminous data to their local machines and then write their own code to analyze them. Technologies and infrastructure to achieve these goals are under development, such as the OceanSpy OGCM data analysis package (Almansi et al 2019), the Pangeo community in geoscience big data (pangeo.io), and the SciServer and JASMIN big data science platforms (Medvedev et al 2016;www.jasmin.ac.uk).…”

Section: Prospects For Computational Oceanographymentioning

confidence: 99%