East Greenland Current

East Greenland Current
U.S coastguard International Ice Patrol · Public domain · source
Name	East Greenland Current
Country	Greenland
Region	North Atlantic Ocean
Source	Arctic Ocean
Mouth	Denmark Strait

East Greenland Current The East Greenland Current is a cold, southward-flowing ocean current along the east coast of Greenland that transports Arctic Ocean waters, sea ice, and icebergs toward the North Atlantic Ocean and Atlantic Meridional Overturning Circulation. It influences regional climates around Greenland, Iceland, and the Faroe Islands and interacts with major features such as the Labrador Sea, Denmark Strait, and the Greenland Sea.

Overview

The current originates from outflow through the Fram Strait, driven by wind and density gradients associated with the Arctic Oscillation, North Atlantic Oscillation, and exchanges with the Beaufort Gyre. It forms a major boundary between the Greenland continental slope and the open North Atlantic, affecting navigation near Cape Farewell and routes used historically by Vikings and modern fisheries such as the Atlantic cod fishery. The current contributes to iceberg drift from tidewater glaciers like Petermann Glacier and Helheim Glacier into shipping lanes used by Maersk Line and research vessels from institutions including the Alfred Wegener Institute and the Norwegian Polar Institute.

Physical Characteristics

The current is characterized by cold temperatures, high salinity variability, and a relatively narrow, bathymetrically steered jet along the continental slope adjacent to Greenland. It exhibits strong seasonal modulation linked to the Arctic sea ice cycle, with winter intensification tied to the Irminger Sea inflow and summer shoaling influenced by meltwater from ice sheets and fjords such as Scoresby Sund. The flow interacts with topographic features including the Denmark Strait sill, Jan Mayen Ridge, and the Greenland-Iceland-Scotland Ridge; mesoscale eddies and barotropic/baroclinic instabilities produce variability documented near Cape Farewell and the East Greenland Shelf.

Water Masses and Transport

The current carries distinct water masses: cold, low-salinity Polar Water from the Arctic Ocean, intermediate-depth Atlantic Water modified along the slope, and dense overflow waters feeding the North Atlantic Deep Water. Transport estimates combine moored arrays, hydrographic sections, and hydrographic surveys across transects near Denmark Strait and the Irminger Basin. Fluxes influence the strength of the Atlantic Meridional Overturning Circulation and exchange with the Labrador Current and West Greenland Current. Tracers such as CFCs, oxygen isotopes, and nutrients are used to partition contributions from sources like Fram Strait outflow and Nordic Seas exchanges.

Interaction with Sea Ice and Glaciers

The current is a primary conveyor of sea ice and icebergs exported from the Arctic Basin through Fram Strait and along the Greenland coast, affecting ice conditions in regions such as the Greenland Sea and shipping approaches to Iceland and Svalbard. It modulates iceberg drift originating from tidewater glaciers including Kangerdlugssuaq Glacier and Humboldt Glacier, influencing iceberg management practices used by International Ice Patrol partners and navigation safety for vessels operated by Royal Arctic Line. The current's thermal structure affects submarine melting and calving processes at marine-terminating glaciers documented by satellite missions like Landsat, Sentinel-1, and ICESat-2.

Climatic and Oceanographic Impacts

By exporting cold, fresh water and sea ice, the current impacts sea surface temperature and salinity patterns that feed back onto the North Atlantic Oscillation and regional climate for Iceland, northern Europe, and eastern Canada. Its role in modulating the salinity of the North Atlantic affects the stability of the Atlantic Meridional Overturning Circulation, with implications studied in climate models used by the Intergovernmental Panel on Climate Change and regional assessments by agencies such as NOAA and the European Space Agency. Variability in the current influences marine ecosystems, including distributions of calanus finmarchicus, capelin, and higher predators like Atlantic cod and harp seal, and intersects with fisheries management by organizations such as the International Council for the Exploration of the Sea.

Observations and Research Methods

Observational programs combine moorings (measuring velocity, temperature, salinity), hydrographic surveys, and remote sensing from satellites like TOPEX/Poseidon and CryoSat. Autonomous platforms, including Argo floats, gliders, and Seagliders, complement traditional ship-based studies by groups such as the Woods Hole Oceanographic Institution, University of Bergen, Scottish Association for Marine Science, and University of Copenhagen. Paleoclimate reconstructions using sediment cores from the Irminger Basin and Greenland margin employ biomarkers, foraminifera assemblages, and radiocarbon dating coordinated with laboratories at the Smithsonian Institution and the Natural Environment Research Council.

Environmental Changes and Trends

Recent observations show changes in freshwater export, sea ice extent, and iceberg calving linked to accelerated melting of the Greenland Ice Sheet. Trends include increased surface freshening in some sectors, shifts in seasonal timing of ice export, and altered heat transport that have been attributed in part to warming documented by NASA and the European Centre for Medium-Range Weather Forecasts. These changes influence regional fisheries managed under agreements involving North Atlantic Fisheries Organization and conservation efforts by groups such as the IUCN and Greenpeace. Ongoing research priorities include attribution of variability to anthropogenic forcing examined in simulations by centers like Met Office Hadley Centre and observational expansion through international programs such as GEOTRACES and the International Arctic Science Committee.

Category:Ocean currents Category:Geography of Greenland Category:North Atlantic Ocean