On the hydrography of Denmark Strait
Mastropole, Dana M.
Pickart, Robert S.
Girton, James B.
MetadataShow full item record
KeywordBolus; Denmark Strait Overflow Water; North Icelandic Jet; Hydrography; East Greenland Current; North Icelandic Irminger Current
Using 111 shipboard hydrographic sections across Denmark Strait occupied between 1990 and 2012, we characterize the mean conditions at the sill, quantify the water mass constituents, and describe the dominant features of the Denmark Strait Overflow Water (DSOW). The mean vertical sections of temperature, salinity, and density reveal the presence of circulation components found upstream of the sill, in particular the shelfbreak East Greenland Current (EGC) and the separated EGC. These correspond to hydrographic fronts consistent with surface-intensified southward flow. Deeper in the water column the isopycnals slope oppositely, indicative of bottom-intensified flow of DSOW. An end-member analysis indicates that the deepest part of Denmark Strait is dominated by Arctic-Origin Water with only small amounts of Atlantic-Origin Water. On the western side of the strait, the overflow water is a mixture of both constituents, with a contribution from Polar Surface Water. Weakly stratified “boluses” of dense water are present in 41% of the occupations, revealing that this is a common configuration of DSOW. The bolus water is primarily Arctic-Origin Water and constitutes the densest portion of the overflow. The boluses have become warmer and saltier over the 22 year record, which can be explained by changes in end-member properties and their relative contributions to bolus composition.
Author Posting. © American Geophysical Union, 2017. 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: Oceans 122 (2017): 306–321, doi:10.1002/2016JC012007.
Suggested CitationArticle: Mastropole, Dana M., Pickart, Robert S., Valdimarsson, Hedinn, Våge, Kjetil, Jochumsen, Kerstin, Girton, James B., "On the hydrography of Denmark Strait", Journal of Geophysical Research: Oceans 122 (2017): 306–321, DOI:10.1002/2016JC012007, https://hdl.handle.net/1912/8869
Showing items related by title, author, creator and subject.
Håvik, Lisbeth; Våge, Kjetil; Pickart, Robert S.; Harden, Benjamin E.; von Appen, Wilken-Jon; Jónsson, Steingrímur; Østerhus, Svein (American Meteorological Society, 2017-10-31)Data from a mooring array deployed north of Denmark Strait from September 2011 to August 2012 are used to investigate the structure and variability of the shelfbreak East Greenland Current (EGC). The shelfbreak EGC is a ...
Liquid freshwater transport estimates from the East Greenland Current based on continuous measurements north of Denmark Strait de Steur, Laura; Pickart, Robert S.; Macrander, Andreas; Våge, Kjetil; Harden, Benjamin E.; Jónsson, Steingrímur; Østerhus, Svein; Valdimarsson, Hedinn (John Wiley & Sons, 2017-01-10)Liquid freshwater transports of the shelfbreak East Greenland Current (EGC) and the separated EGC are determined from mooring records from the Kögur section north of Denmark Strait between August 2011 and July 2012. The ...
Våge, Kjetil; Pickart, Robert S.; Spall, Michael A.; Moore, G. W. K.; Valdimarsson, Hedinn; Torres, Daniel J.; Erofeeva, Svetlana Y.; Nilsen, Jan Even Ø. (2013-04-26)The circulation and water mass transports north of the Denmark Strait are investigated using recently collected and historical in-situ data along with an idealized numerical model and atmospheric reanalysis fields. Emphasis ...