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Tracer-based assessment of the origin and biogeochemical transformation of a cyclonic eddy in the Sargasso Sea
Authors
Allen
Anderson
+52 more
Bates
Bates
Broecker
Buesseler
Capone
Conkright
Dennis A. Hansell
Dennis J. McGillicuddy
Falkowski
Geider
Gruber
Hansell
Hansell
Hansell
Harris
Jenkins
Jenkins
Koeve
Law
Leben
Li
Li
Li
Li
Lipschultz
Lukas
Martin
McDonagh
McDowell
McDowell
McGillicuddy
McGillicuddy
Morel
Nicholas R. Bates
Ono
Oschlies
Oschlies
Prater
Prospero
Qian P. Li
Redfield
Richardson
Rodney J. Johnson
Schmitz
Seki
Siegel
Smythe-Wright
Sweeney
Takahashi
Vaillancourt
Williams
Williams
Publication date
1 October 2008
Publisher
'American Geophysical Union (AGU)'
Doi
Cite
Abstract
Author Posting. © American Geophysical Union, 2008. 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 113 (2008): C10006, doi:10.1029/2008JC004840.Mechanisms of nutrient supply in oligotrophic ocean systems remain inadequately understood and quantified. In the North Atlantic Subtropical Gyre, for example, the observed rates of new production are apparently not balanced by nutrient supply via vertical mixing. Mesoscale eddies have been hypothesized as a mechanism for vertical nutrient pumping into the euphotic zone, but the full range and magnitude of biogeochemical impacts by eddies remain uncertain. We evaluated a cyclonic eddy located near Bermuda for its effect on water column biogeochemistry. In the density range σ θ 26.1 to 26.7, an eddy core with anomalous salinity, temperature, and biogeochemical properties was observed, suggesting that the eddy was not formed with local water (i.e., not formed of the waters surrounding the eddy at the time of observations), hence complicating efforts to quantify biogeochemical processes in the eddy. We combined conservative hydrographic tracers (density versus potential temperature and salinity) and quasi-conservative biogeochemical tracers (density versus NO, PO, and total organic carbon) to propose the origin of the eddy core water to have been several hundred kilometers to the southeast of the eddy location at sampling. By comparing the observed eddy core's biogeochemical properties with those near the proposed origin, we estimate the net changes in biogeochemical properties that occurred. A conservative estimate of export was 0.5 ± 0.34 mol N m−2 via sinking particles, with export occurring prior to our period of direct observation. Our results suggest that biogeochemical signals induced by mesoscale eddies could survive to be transported over long distances, thus providing a mechanism for lateral fluxes of nutrients and AOU (apparent oxygen utilization). Given that the proposed source area of this eddy is relatively broad, and the eddy-mixing history before our sampling is unknown, uncertainty remains in our assessment of the true biogeochemical impact of mesoscale eddies in the gyre.Support for the EDDIES project came from the U.S. National Science Foundation. D.J.M. was also partially supported by NASA
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