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| Deep Labrador Current | |
|---|---|
| Name | Deep Labrador Current |
| Type | Ocean current |
| Location | North Atlantic Ocean, Labrador Sea |
| Source | Labrador Sea |
| Terminus | North Atlantic Current, West Greenland Current |
| Temperature | Cold |
| Salinity | High |
| Density | High |
| Depth | Deep ocean |
| Majorstreams | Arctic outflow, Greenland Ice Sheet meltwater |
Deep Labrador Current The Deep Labrador Current is a cold, dense deep-ocean flow originating in the Labrador Sea and flowing southward along the continental slope of Labrador and Newfoundland before entraining into the broader North Atlantic circulation. It plays a central role in linking the Arctic Ocean outflow through the Davis Strait and Labrador Sea convection with the northward Gulf Stream system and the North Atlantic Current. The current influences deep-water properties relevant to the Atlantic Meridional Overturning Circulation, North Atlantic Oscillation, and regional climate variability affecting Greenland, Iceland, and eastern Canada.
The Deep Labrador Current is a component of the subpolar North Atlantic circulation system involving water exchanges among the Labrador Sea, Baffin Bay, Hudson Strait, and the inflow to the North Atlantic Current and Irving Gyre. Driven by density contrasts associated with cooling, brine rejection, and glacial melt, it forms part of the pathways that connect processes in the Arctic Ocean with the lower-latitude Atlantic Ocean. The current interacts with major North Atlantic features such as the Labrador Current (surface), the West Greenland Current, the East Greenland Current, and the Flemish Cap circulation patterns.
Physically, the Deep Labrador Current is characterized by low temperatures, elevated salinity relative to surface waters, and high density that promote deep-ocean flow along the continental slope near Newfoundland and Labrador (province). It occupies bathymetric corridors shaped by the Grand Banks, Charlie-Gibbs Fracture Zone, and the Labrador Basin seafloor topography, interacting with the continental shelf and continental slope features. The current contributes to deep stratification and thermohaline gradients relevant to the Atlantic Multidecadal Variability and modulates water-mass properties observed in long-term programs such as the World Ocean Circulation Experiment, Arctic and Subarctic Ocean Fluxes Study, and regional monitoring by agencies like Fisheries and Oceans Canada and NOAA.
Formation processes include wintertime convective overturning in the Labrador Sea influenced by cold air outbreaks from Greenland and the Canadian Arctic Archipelago, salt rejection during sea-ice formation in Baffin Bay and the Canadian Arctic, and freshwater inputs from Greenland Ice Sheet melt and Hudson Bay River discharge. The current’s pathway proceeds southward past Labrador City offshore of Nunatsiavut territories, skirts the Grand Banks of Newfoundland, and bifurcates around bathymetric obstacles toward the Irminger Sea and the mid‑North Atlantic through passages like the Charlie-Gibbs Fracture Zone feeding the Irminger Current and North Atlantic Current.
The Deep Labrador Current interacts dynamically with Arctic-derived dense waters including Denmark Strait Overflow Water, East Greenland Current outflow, and modified Labrador Sea Water. It exchanges properties with the warmer, saltier Gulf Stream and North Atlantic Drift via entrainment, mixing across the Western Boundary Current system, and mesoscale eddy processes near the Flemish Cap and the Tail of the Banks. These interactions are modulated by climate modes such as the North Atlantic Oscillation, Arctic Oscillation, and episodic events like the Great Salinity Anomaly that alter salinity, temperature, and density contrasts across the subpolar gyre.
By conveying cold, oxygen-rich deep waters, the current affects deep benthic habitats around the Grand Banks, Flemish Cap, and continental slope ecosystems exploited by fisheries for Atlantic cod, Greenland halibut, capelin, and snow crab. Its modulation of nutrient distributions influences productivity in regions used by migratory species like the Atlantic salmon and marine mammals such as narwhal, beluga whale, bowhead whale, and minke whale. Climatically, variability in the Deep Labrador Current contributes to heat transport changes linked to the Atlantic Meridional Overturning Circulation, regional sea-surface temperature anomalies affecting Icelandic and Greenland climates, and the frequency of sea-ice export events with socioeconomic impacts on communities like St. John’s, Newfoundland and Labrador and Nuuk.
Observational programs utilize moored arrays, conductivity-temperature-depth (CTD) casts, Argo floats, autonomous underwater vehicles, and ship-based hydrographic surveys coordinated by institutions such as Bedford Institute of Oceanography, Woods Hole Oceanographic Institution, Scripps Institution of Oceanography, Dalhousie University, and international collaborations including CLIVAR and GO-SHIP. Studies employ tracers like chlorofluorocarbons, radiocarbon, and oxygen isotopes analyzed in laboratories at Lamont–Doherty Earth Observatory and Plymouth Marine Laboratory to resolve water-mass ages and mixing. Satellite altimetry from TOPEX/Poseidon and Jason missions, along with gravimetry from GRACE, complement in situ data to infer circulation, eddy kinetic energy, and mass transport.
The Deep Labrador Current influences fisheries managed under frameworks such as the Northwest Atlantic Fisheries Organization and national policies administered by Fisheries and Oceans Canada and the Icelandic Directorate of Fisheries. Changes in deep-water properties affect recruitment of commercially important stocks including Atlantic cod (Gadus morhua), capelin (Mallotus villosus), and Atlantic herring (Clupea harengus), with economic consequences for ports like St. John’s, Halifax, and Reykjavík. The current also bears on offshore energy activities near Newfoundland and Labrador and transatlantic shipping via its influence on iceberg trajectories traced by historical campaigns like the International Ice Patrol. Ongoing climate change, intensified Greenland Ice Sheet melt, and Arctic export variability pose challenges for resource management, international cooperation involving parties such as Canada, Denmark, Iceland, and United States, and scientific programs aimed at understanding the evolving North Atlantic system.