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Iron in the Sargasso Sea (Bermuda Atlantic Time-series Study region) during summer: Eolian imprint, spatiotemporal variability, and ecological implications

Citation

Sedwick, PN and Church, TM and Bowie, AR and Marsay, CM and Ussher, SJ and Achilles, KM and Lethaby, PJ and Johnson, RJ and Sarin, MM and McGillicuddy, DJ, Iron in the Sargasso Sea (Bermuda Atlantic Time-series Study region) during summer: Eolian imprint, spatiotemporal variability, and ecological implications, Global Biogeochemical Cycles, 19, (4) pp. 1-11. ISSN 0886-6236 (2005) [Refereed Article]

DOI: doi:10.1029/2004GB002445

Abstract

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. Copyright 2005 by the American Geophysical Union.

Item Details

Item Type:Refereed Article
Research Division:Earth Sciences
Research Group:Oceanography
Research Field:Chemical Oceanography
Objective Division:Environment
Objective Group:Other Environment
Objective Field:Marine Oceanic Processes (excl. climate related)
Author:Bowie, AR (Associate Professor Andrew Bowie)
ID Code:38609
Year Published:2005
Web of Science® Times Cited:74
Deposited By:Chemistry
Deposited On:2005-08-01
Last Modified:2012-04-20
Downloads:0

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