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 CitationArticle: Sedwick, Peter N., Church, Thomas M., Bowie, Andrew R., Marsay, Christopher M., Ussher, Simon J., Achilles, K. M., Lethaby, Paul, Johnson, Rodney J., Sarin, M. M., McGillicuddy, Dennis J., "Iron in the Sargasso Sea (Bermuda Atlantic Time-series Study region) during summer : eolian imprint, spatiotemporal variability, and ecological implications", Global Biogeochemical Cycles 19 (2005): GB4006, DOI:10.1029/2004GB002445, https://hdl.handle.net/1912/289
Showing items related by title, author, creator and subject.
Saito, Mak A. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 2001-02)Processes that enable marine phytoplankton to acquire trace metals are fundamental to our understanding of primary productivity and global carbon cycling. This thesis explored the biogeochemistry of cobalt using analytical ...
Deglacial diatom productivity and surface ocean properties over the Bermuda Rise, northeast Sargasso Sea Gil, Isabelle M.; Keigwin, Lloyd D.; Abrantes, Fatima G. (American Geophysical Union, 2009-12-12)Diatom assemblages document surface hydrographic changes over the Bermuda Rise. Between 19.2 and 14.5 ka, subtropical diatom species and Chaetoceros resting spores dominate the flora, as in North Atlantic productive regions ...
Toole, Dierdre A.; Siegel, David A.; Doney, Scott C. (American Geophysical Union, 2008-04-12)We evaluate the extent to which dimethylsulfide (DMS) cycling in an open-ocean environment can be constrained and parameterized utilizing emerging evidence for the significant impacts of solar ultraviolet radiation (UVR) ...