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

journal contribution
posted on 2023-05-16, 17:35 authored by Sedwick, PN, Church, TM, Andrew BowieAndrew Bowie, Marsay, CM, Ussher, SJ, Achilles, KM, Lethaby, PJ, Johnson, RJ, Sarin, MM, McGillicuddy, DJ
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.

History

Publication title

Global Biogeochemical Cycles

Volume

19

Issue

4

Pagination

1-11

ISSN

0886-6236

Department/School

School of Natural Sciences

Publisher

Amer Geophysical Union

Place of publication

Washington

Repository Status

  • Restricted

Socio-economic Objectives

Oceanic processes (excl. in the Antarctic and Southern Ocean)

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