OceanSpy: A Python package to facilitate ocean model data analysis and visualization

Almansi, Mattia; Gelderloos, Renske; Haine, Thomas W. N.; Saberi, Atousa; Siddiqui, Ali H.

doi:10.21105/joss.01506

Cited by 14 publications

(14 citation statements)

References 4 publications

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“…We computed transports across each section of this line using the OceanSpy python toolbox (Almansi et al., 2019) “Survey” tool. Velocities at the shelfbreak are projected using the local shelf angle to compute the orthogonal velocity, which is then used to compute volume transport.…”

Section: Methodsmentioning

confidence: 99%

“…The salinity field is practical salinity, and practical salinity is used throughout the article. Additional fields and computations, as presented in Section 2.2, can be reproduced using the OceanSpy v0.1 python package (Almansi et al., 2019). To avoid confusion with other datasets, we will refer to this simulation as MITgcm in the rest of the manuscript.…”

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%

Section: Methodsmentioning

confidence: 99%

Wind‐Driven Freshwater Export at Cape Farewell

2022

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“…This model has been shown to accurately simulate the circulation in the Denmark Strait region ( 22 , 37 , 38 ). Model-based quantities have been extracted and calculated using OceanSpy ( 39 ).…”

Section: Methodsmentioning

confidence: 99%

A continuous pathway for fresh water along the East Greenland shelf

2020

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Export from the Arctic and meltwater from the Greenland Ice Sheet together form a southward-flowing coastal current along the East Greenland shelf. This current transports enough fresh water to substantially alter the large-scale circulation of the North Atlantic, yet the coastal current’s origin and fate are poorly known due to our lack of knowledge concerning its north-south connectivity. Here, we demonstrate how the current negotiates the complex topography of Denmark Strait using in situ data and output from an ocean circulation model. We determine that the coastal current north of the strait supplies half of the transport to the coastal current south of the strait, while the other half is sourced from offshore via the shelfbreak jet, with little input from the Greenland Ice Sheet. These results indicate that there is a continuous pathway for Arctic-sourced fresh water along the entire East Greenland shelf from Fram Strait to Cape Farewell.

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“…10.1029/2019GL086759 this paper can be reproduced using OceanSpy v0.1 (Almansi et al, 2019). The model is particularly well suited to study mesoscale features occurring on short time scales (1-10 days; Almansi et al, 2017;Spall et al, 2019).…”

Section: Geophysical Research Lettersmentioning

confidence: 99%

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

Almansi¹,

Haine

Gelderloos

et al. 2021

Preprint

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Denmark Strait, the channel located between Greenland and Iceland, is a critical gateway between the Nordic Seas and the North Atlantic.&#160;Mesoscale features crossing the strait regularly enhance the volume transport of the Denmark Strait overflow. They interact with the dense water masses descending into the subpolar North Atlantic and therefore are important for the Atlantic Meridional Overturning Circulation. Using a realistic numerical model, we find new evidence of the causal relationship between overflow surges (i.e., mesoscale features associated with high-transport events) and overflow cyclones observed downstream. Most of the cyclones form at the Denmark Strait sill during overflow surges and, because of potential vorticity conservation and stretching of the water column, grow as they move equatorward. A fraction of the cyclones form downstream of the sill, when anticyclonic vortices formed during high-transport events start collapsing. Regardless of their formation mechanism, the cyclones weaken starting roughly 150 km downstream of the sill, and potential vorticity is only materially conserved during the growth phase.

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OceanSpy: A Python package to facilitate ocean model data analysis and visualization

Cited by 14 publications

References 4 publications

Wind‐Driven Freshwater Export at Cape Farewell

Wind‐Driven Freshwater Export at Cape Farewell

A continuous pathway for fresh water along the East Greenland shelf

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

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