Atlantic water variability on the SE Greenland continental shelf and its relationship to SST and bathymetry
Sutherland, David A.
Stenson, Garry B.
Davidson, Fraser J. M.
Hammill, Mike O.
MetadataShow full item record
KeywordEast Greenland Current; Irminger Current; Bathymetry; SST; Ice-ocean interactions; Marine mammal tagging
Interaction of warm, Atlantic-origin water (AW) and colder, polar origin water (PW) advecting southward in the East Greenland Current (EGC) influences the heat content of water entering Greenland's outlet glacial fjords. Here we use depth and temperature data derived from deep-diving seals to map out water mass variability across the continental shelf and to augment existing bathymetric products. We compare depths derived from the seal dives with the IBCAO Version 3 bathymetric database over the shelf and find differences up to 300 m near several large submarine canyons. In the vertical temperature structure, we find two dominant modes: a cold mode, with the typical AW/PW layering observed in the EGC, and a warm mode, where AW is present throughout the water column. The prevalence of these modes varies seasonally and spatially across the continental shelf, implying distinct AW pathways. In addition, we find that satellite sea surface temperatures (SST) correlate significantly with temperatures in the upper 50 m (R = 0.54), but this correlation decreases with depth (R = 0.22 at 200 m), and becomes insignificant below 250 m. Thus, care must be taken in using SST as a proxy for heat content, as AW mainly resides in these deeper layers.
Author Posting. © American Geophysical Union, 2013. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Journal of Geophysical Research 118 (2013): 847–855, doi:10.1029/2012JC008354.
Suggested CitationArticle: Sutherland, David A., Straneo, Fiamma, Stenson, Garry B., Davidson, Fraser J. M., Hammill, Mike O., Rosing-Asvid, Aqqalu, "Atlantic water variability on the SE Greenland continental shelf and its relationship to SST and bathymetry", Journal of Geophysical Research 118 (2013): 847–855, DOI:10.1029/2012JC008354, https://hdl.handle.net/1912/5926
Showing items related by title, author, creator and subject.
Outlet glacier dynamics and bathymetry at Upernavik Isstrøm and Upernavik Isfjord, North-West Greenland Andresen, Camilla S.; Kjeldsen, Kristian K.; Harden, Benjamin E.; Norgaard-Pedersen, Niels; Kjaer, Kurt H. (Geological Survey of Denmark and Greenland, 2014-07)During the past decades, the Greenland ice sheet has experienced a marked increase in mass loss resulting in an increased contribution to global sea-level rise. The three largest outlet glaciers in Greenland have increased ...
BedMachine v3 : complete bed topography and ocean bathymetry mapping of Greenland from multibeam echo sounding combined with mass conservation Morlighem, Mathieu; Williams, Chris N.; Rignot, Eric; An, Lu; Arndt, Jan Erik; Bamber, Jonathan L.; Catania, Ginny; Chauché, Nolwenn; Dowdeswell, Julian; Dorschel, Boris; Fenty, Ian; Hogan, Kelly; Howat, Ian M.; Hubbard, Alun; Jakobsson, Martin; Jordan, Tom M.; Kjeldsen, Kristian K.; Millan, Romain; Mayer, Larry A.; Mouginot, Jeremie; Noël, Brice P. Y.; O’Cofaigh, Colm; Palmer, Steven; Rysgaard, Soren; Seroussi, Helene; Siegert, Martin J.; Slabon, Patricia; Straneo, Fiamma; Van den Broeke, Michiel; Weinrebe, W.; Wood, Michael; Zinglersen, Karl Brix (John Wiley & Sons, 2017-11-01)Greenland's bed topography is a primary control on ice flow, grounding line migration, calving dynamics, and subglacial drainage. Moreover, fjord bathymetry regulates the penetration of warm Atlantic water (AW) that rapidly ...
Moulton, Melissa; Elgar, Steve; Raubenheimer, Britt (2013-06)Surfzone bathymetry often is resolved poorly in time because watercraft surveys cannot be performed when waves are large, and remote sensing techniques have limited vertical accuracy. However, accurate high-frequency ...