Freshwater composition of the waters off southeast Greenland and their link to the Arctic Ocean
Sutherland, David A.
Pickart, Robert S.
Jones, E. Peter
Eert, A. Jane
MetadataShow full item record
KeywordPacific Water; East Greenland current; Arctic Oscillation; Freshwater composition; Cape Farewell; Denmark Strait
The freshwater composition of waters on the southeast Greenland shelf and slope are described using a set of high-resolution transects occupied in summer 2004, which included hydrographic, velocity, nutrient, and chemical tracer measurements. The nutrient and tracer data are used to quantify the fractions of Pacific Water, sea ice melt, and meteoric water present in the upper layers of the East Greenland Current (EGC) and East Greenland Coastal Current (EGCC). The EGC/EGCC system dominates the circulation of this region and strongly influences the observed distribution of the three freshwater types. Sea ice melt and meteoric water fractions are surface intensified, reflecting their sources, and generally increase southward from Denmark Strait to Cape Farewell, as well as shoreward. Significant fractions of Pacific Water are found in the subsurface layers of the EGCC, supporting the idea that this inner shelf branch is directly linked to the EGC and thus to the Arctic Ocean. A set of historical sections is examined to investigate the variability of Pacific Water content in the EGC and EGCC from 1984 to 2004 in the vicinity of Denmark Strait. The fraction of Pacific Water increased substantially in the late 1990s and subsequently declined to low levels in 2002 and 2004, mirroring the reduction in Pacific Water content reported previously at Fram Strait. This variability is found to correlate significantly with the Arctic Oscillation index, lagged by 9 years, suggesting that the Arctic Ocean circulation patterns bring varying amounts of Pacific Water to the North Atlantic via the EGC/EGCC.
Author Posting. © American Geophysical Union, 2009. 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 114 (2009): C05020, doi:10.1029/2008JC004808.
Showing items related by title, author, creator and subject.
de Steur, Laura; Pickart, Robert S.; Torres, Daniel J.; Valdimarsson, Heoinn (John Wiley & Sons, 2015-04-01)Results from three hydrographic surveys across the East Greenland Current between 2011 and 2013 are presented with focus on the freshwater sources. End-member analysis using salinity, δ18O, and nutrient data shows that ...
Dukhovskoy, Dmitry S.; Myers, Paul G.; Platov, Gennady A.; Timmermans, Mary-Louise; Curry, Beth; Proshutinsky, Andrey; Bamber, Jonathan L.; Chassignet, Eric P.; Hu, Xianmin; Lee, Craig M.; Somavilla, Raquel (John Wiley & Sons, 2016-01-25)Accelerating since the early 1990s, the Greenland Ice Sheet mass loss exerts a significant impact on thermohaline processes in the sub-Arctic seas. Surplus freshwater discharge from Greenland since the 1990s, comparable ...
Liquid freshwater transport and Polar Surface Water characteristics in the East Greenland Current during the AO-02 Oden expedition Nilsson, Johan; Bjork, Goran; Rudels, Bert; Winsor, Peter; Torres, Daniel J. (2008-01-09)Dynamical features of the East Greenland Current (EGC) are synthesized from a survey conducted by the Swedish icebreaker Oden during the International Arctic Ocean - 02 expedition (AO-02) in May 2002 with emphasis on the ...