Iron in the Sargasso Sea (Bermuda Atlantic Time-series Study region) during summer : eolian imprint, spatiotemporal variability, and ecological implications
Sedwick, Peter N.
Church, Thomas M.
Bowie, Andrew R.
Marsay, Christopher M.
Ussher, Simon J.
Achilles, K. M.
Johnson, Rodney J.
Sarin, M. M.
McGillicuddy, Dennis J.
MetadataShow full item record
We report iron measurements for water column and aerosol samples collected in the Sargasso Sea during July-August 2003 (summer 2003) and April-May 2004 (spring 2004). Our data reveal a large seasonal change in the dissolved iron (dFe) concentration of surface waters in the Bermuda Atlantic Time-series Study region, from ∼1–2 nM in summer 2003, when aerosol iron concentrations were high (mean 10 nmol m−3), to ∼0.1–0.2 nM in spring 2004, when aerosol iron concentrations were low (mean 0.64 nmol m−3). During summer 2003, we observed an increase of ∼0.6 nM in surface water dFe concentrations over 13 days, presumably due to eolian iron input; an estimate of total iron deposition over this same period suggests an effective solubility of 3–30% for aerosol iron. Our summer 2003 water column profiles show potentially growth-limiting dFe concentrations (0.02–0.19 nM) coinciding with a deep chlorophyll maximum at 100–150 m depth, where phytoplankton biomass is typically dominated by Prochlorococcus during late summer.
Author Posting. © American Geophysical Union, 2005. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Global Biogeochemical Cycles 19 (2005): GB4006, doi:10.1029/2004GB002445.
Suggested CitationGlobal Biogeochemical Cycles 19 (2005): GB4006
Showing items related by title, author, creator and subject.
Hansel, Colleen M.; Buchwald, Carolyn; Diaz, Julia M.; Ossolinski, Justin E.; Dyhrman, Sonya T.; Van Mooy, Benjamin A. S.; Polyviou, Despo (John Wiley & Sons, 2016-05-12)Reactive oxygen species (ROS) are key players in the health and biogeochemistry of the ocean and its inhabitants. The vital contribution of microorganisms to marine ROS levels, particularly superoxide, has only recently ...
Siegel, David A.; Peterson, P.; McGillicuddy, Dennis J.; Maritorena, S.; Nelson, Norman B. (American Geophysical Union, 2011-07-14)We investigate the bio-optical footprints made by mesoscale eddies in the Sargasso Sea and the processes that create them through an eddy-centric approach. Many (>10,000) eddies are identified and followed in time using ...
Net community production of oxygen derived from in vitro and in situ 1-D modeling techniques in a cyclonic mesoscale eddy in the Sargasso Sea Mourino-Carballido, Beatriz; Anderson, Laurence A. (Copernicus Publications on behalf of the European Geosciences Union, 2009-08-26)It has been proposed that the disagreement traditionally reported between in vitro incubation and in situ estimates of oxygen net community production (NCP) could be explained, at least partially, by undersampling episodic ...