Freshwater Variability and Transport in the Labrador Sea From In Situ and Satellite Observations

Majumder, Sudip; Castelao, Renato M.; Amos, Caitlin M.

doi:10.1029/2020jc016751

Cited by 6 publications

(10 citation statements)

References 74 publications

(118 reference statements)

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“…Therefore, it is characterized as the most significant exchange of the current system with the Labrador Sea interior, which is also shown by the observational study by Myers et al (2009). Majumder et al (2021) has also pointed out that the offshore transport from the coast to the interior Labrador Sea mainly occurs at 61°N-62°N. In terms of how the waters are transported offshore, besides predominantly offshore Ekman transports, Irminger Rings (Figure 1) are also formed and exchange waters offshore in this region (Katsman et al, 2004;Pennelly & Myers, 2022).…”

Section: Transport Losses and Exchangessupporting

confidence: 53%

“…And a recent observational study by Majumder et al. (2021) has shown that the speed of the WGC flowing from 61°N to 64–65°N is approximately 0.17 ms −1 .…”

Section: Speedsmentioning

confidence: 95%

“…Majumder et al. (2021) has also pointed out that the offshore transport from the coast to the interior Labrador Sea mainly occurs at 61°N–62°N. In terms of how the waters are transported offshore, besides predominantly offshore Ekman transports, Irminger Rings (Figure 1) are also formed and exchange waters offshore in this region (Katsman et al., 2004; Pennelly & Myers, 2022).…”

Section: Transportsmentioning

confidence: 96%

“…The modeling study by Lique et al (2009) suggested that the WGC speed across the Davis Strait could reach 0.1 ms −1 . And a recent observational study by Majumder et al (2021) has shown that the speed of the WGC flowing from 61°N to 64-65°N is approximately 0.17 ms −1 .…”

Section: Annual Mean Structurementioning

confidence: 98%

“…They showed that as it goes from Cape Farewell to Cape Desolation, its volume transport decreases from 1.01 to 0.42 Sv, and the freshwater transport decreases from 49.50 to 23.32 mSv (referenced to 34.8). Recently, its seasonality was studied by the sectional data from the Overturning in the Subpolar North Atlantic Program (OSNAP; Lozier et al., 2017, Pacini et al., 2020) and combined in situ and satellite data (Majumder et al., 2021). Additionally, a recent high‐resolution modeling study (Gou et al., 2021) has revealed very similar seasonal features as these observations showed, such as the seasonal transport cycles.…”

Section: Introductionmentioning

confidence: 99%

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The Changing Behavior of the West Greenland Current System in a Very High‐Resolution Model

2022

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The West Greenland Current (WGC; Figure 1) has a significant role in modulating the deep convection in the Labrador Sea (Li et al., 2021), where an important mode water -Labrador Sea Water (LSW), is produced. It is a strong current that is situated on the shelf break of west Greenland. It carries a significant amount of buoyant water, with low salinity water of Arctic origin at the surface, as well as the warm and salty Irminger water at intermediate depths (

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Section: Transport Losses and Exchangessupporting

confidence: 53%

“…And a recent observational study by Majumder et al. (2021) has shown that the speed of the WGC flowing from 61°N to 64–65°N is approximately 0.17 ms −1 .…”

Section: Speedsmentioning

confidence: 95%

Section: Transportsmentioning

confidence: 96%

Section: Annual Mean Structurementioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

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The Changing Behavior of the West Greenland Current System in a Very High‐Resolution Model

2022

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Inter-annual Variability of the Current System off the West Greenland Coast from a very high-resolution numerical model

Gou

Pennelly

Myers

2022

Preprint

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Analyzing a high-resolution (1/60°) numerical model over 2008 to 2018, the inter-annual variability of the West Greenland Coastal Current (WGCC) on the shelf and West Greenland Current (WGC) at shelf break is presented. Both currents flow from Cape Farewell and extend to Davis Strait, with their model speeds and transports corresponding well with observations. The inter-annual variability of the WGCC and WGC near southwest Greenland are opposite, with the former declining while the latter strengthened, both by a speed change above 0.1 m/s. Both currents are predominantly buoyancy forced, but wind forcing becomes more dominant towards Davis Strait. The main exchanges from the two currents to interior occur between Cape Desolation and Fylla Bank, with net volume, freshwater, heat transport decreases of 1.4 Sv, 13 mSv, 36.7 TW. The freshwater transport of the WGC itself does not drop in between these sections, receiving freshwater from the WGCC to compensate for the losses to the basin interior. Thus, we see significant freshwater (83.1 mSv) and heat transports (70.7 TW) of the WGC remaining at Fylla Bank that reach the northern basin instead of being fluxed into the interior pof the Labrador Sea. This suggests that the exchange between the current system and the interior is more limited than previously thought, and most of the Greenland and Arctic melt reaches the northern Labrador Sea. Our results highlight the importance of resolving the WGCC and shelf processes.

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Wind‐Forced Upwelling Along the West Greenland Shelfbreak: Implications for Labrador Sea Water Formation

Pacini

Pickart

2023

JGR Oceans

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Arctic‐origin and Greenland meltwaters circulate cyclonically in the boundary current system encircling the Labrador Sea. The ability of this freshwater to penetrate the interior basin has important consequences for dense water formation and the lower limb of the Atlantic Meridional Overturning Circulation. However, the precise mechanisms by which the freshwater is transported offshore, and the magnitude of this flux, remain uncertain. Here, we investigate wind‐driven upwelling northwest of Cape Farewell using 4 years of high‐resolution data from the Overturning in the Subpolar North Atlantic Program west Greenland mooring array, deployed from September 2014–2018, along with Argo, shipboard, and atmospheric reanalysis data. A total of 49 upwelling events were identified corresponding to enhanced northwesterly winds, followed by reduced along‐stream flow of the boundary current and anomalously dense water present on the outer shelf. The events occur during the development stage of forward Greenland tip jets. During the storms, a cross‐stream Ekman cell develops that transports freshwater offshore in the surface layer and warm, saline, Atlantic‐origin waters onshore at depth. The net fluxes of heat and freshwater for a representative storm are computed. Using a one‐dimensional mixing model, it is shown that the freshwater input resulting from the locus of winter storms could significantly limit the wintertime development of the mixed layer and hence the production of Labrador Sea Water in the southeastern part of the basin.

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Freshwater Variability and Transport in the Labrador Sea From In Situ and Satellite Observations

Cited by 6 publications

References 74 publications

The Changing Behavior of the West Greenland Current System in a Very High‐Resolution Model

The Changing Behavior of the West Greenland Current System in a Very High‐Resolution Model

Inter-annual Variability of the Current System off the West Greenland Coast from a very high-resolution numerical model

Wind‐Forced Upwelling Along the West Greenland Shelfbreak: Implications for Labrador Sea Water Formation

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