Southeast Greenland Ridge

Southeast Greenland Ridge
Name	Southeast Greenland Ridge
Location	North Atlantic Ocean, southeast of Greenland
Coordinates	approx. 61°–70°N, 30°–10°W
Length	~1200 km
Depth	1000–3500 m
Type	Oceanic ridge / continental margin feature

Southeast Greenland Ridge is an elongate submarine ridge system located off the southeast coast of Greenland in the North Atlantic Ocean. The feature separates bathymetric basins and influences the pathways of the Labrador Sea and Irminger Sea water masses, while recording a complex history of Paleogene to Quaternary tectonics, sedimentation, and ocean circulation. The ridge has been the focus of multidisciplinary studies by institutions such as the Alfred Wegener Institute, GEOMAR Helmholtz Centre for Ocean Research Kiel, and the University of Copenhagen.

Geography and morphology

The ridge extends along the continental rise between the Denmark Strait and the abyssal plains adjoining the Reykjanes Ridge and the Irminger Basin, forming morphological boundaries with the Labrador Basin and the Greenland-Iceland-Faroe Ridge. Bathymetric surveys by research vessels including RV Polarstern and RRS James Cook reveal topographic highs, sediment drift forms, and channel systems that connect to the East Greenland Current corridor and the North Atlantic Current. Prominent geomorphic elements on the ridge include transverse ridges, slope terraces, and sediment drifts comparable to features mapped near the Flemish Cap and the Hatton Bank. The ridge's seafloor morphology influences deepwater spillover between the Irminger Sea and the deeper North Atlantic Deep Water pathways traced by hydrographic campaigns from NOAA and the National Oceanography Centre (UK).

Geological formation and tectonics

The ridge records tectonic events related to the opening of the North Atlantic Ocean and the movement of the Eurasian Plate and North American Plate since the Paleocene and Eocene. Seismic reflection and refraction profiles acquired by teams at University of Bergen and Utrecht University indicate stratified sedimentary wedges overlying tilted crustal blocks associated with rift margin subsidence similar to that documented at the Newfoundland margin and the Porcupine Basin. Volcaniclastic layers correlate with activity on the Iceland plume and the Reykjanes Ridge during the Paleogene volcanic province events. Faulting, mass-wasting scars, and contourite deposits show interactions between tectonic uplift, glacial loading from Greenland Ice Sheet advances, and postglacial isostatic adjustment studied by researchers from Columbia University and Lamont–Doherty Earth Observatory.

Oceanography and currents

The ridge modulates the flow of the East Greenland Current, the inflow of Irmin ger Current-related waters, and the southward export of Polar water and Subpolar Mode Water. Hydrographic sections by Scripps Institution of Oceanography and Woods Hole Oceanographic Institution demonstrate that the ridge steers warm core rings and eddies generated by the North Atlantic Current and influences the formation sites of Labrador Sea Water and conversion to North Atlantic Deep Water. Time-series data from moorings deployed by Danish Meteorological Institute and Helmholtz Centre for Polar and Marine Research show variability linked to the North Atlantic Oscillation and abrupt shifts correlated with Heinrich events and Dansgaard–Oeschger events recorded in Greenland ice cores from Niels Bohr Institute campaigns.

Paleoclimate and sedimentary record

Core records from piston and gravity coring expeditions led by GEUS and BGR recover hemipelagic and contourite sequences with glacial-interglacial cyclicity reflecting Marine Isotope Stages. Sedimentologic analyses show ice-rafted debris layers tied to iceberg discharge episodes contemporaneous with events seen at Cape Farewell and in North Atlantic Deep Sea Drilling Project sites. Biogenic proxies including foraminifera assemblages, diatom floras, and stable isotopes have been interpreted in collaboration with scientists at ETH Zurich, University of Bergen, and Plymouth Marine Laboratory to reconstruct past surface and deepwater temperatures, salinity, and productivity during the Last Glacial Maximum and the Holocene Thermal Maximum. Tephra layers correlate with eruptions from Iceland volcanic systems and permit precise tie-points between marine and terrestrial archives such as the Greenland Ice Sheet Project (GISP) cores.

Biological communities and ecosystem dynamics

Benthic habitats on the ridge host faunal assemblages studied by benthic ecologists from Scottish Association for Marine Science and Queen’s University Belfast. Cold-water coral frameworks, sponge grounds, and diverse macrofauna including echinoderms and crustaceans are documented via ROV surveys from Ifremer and the Ocean Exploration Trust. The ridge’s interaction with current systems enhances planktonic productivity that supports higher trophic-level species such as capelin, Atlantic cod, and migratory cetaceans including fin whale and humpback whale observed by marine mammal surveys coordinated with IWC and Greenland Institute of Natural Resources. Benthic-pelagic coupling also affects demersal fisheries managed under regional bodies like the North East Atlantic Fisheries Commission.

Human exploration and scientific research

Exploration of the ridge has involved multinational expeditions aboard ships such as RV Polarstern, RRS Discovery, and JS ‘Yukon’ with collaboration among institutions including University of Iceland, Norwegian Polar Institute, and Plymouth University. Projects funded by the European Commission and national science foundations have produced integrated datasets encompassing multibeam bathymetry, seismic profiles, sediment cores, and biological surveys archived at repositories like the British Oceanographic Data Centre and PANGAEA. Ongoing research addresses climate teleconnections relevant to the IPCC assessments and informs resource management discussions involving Greenland and international maritime stakeholders represented at the United Nations Convention on the Law of the Sea forums.

Category:North Atlantic Ocean Category:Undersea ridges