Seasonal iron depletion in temperate shelf seas

Birchill, Antony J., Milne, Angela, S. Woodward, E. Malcolm, Harris, Carolyn, Annett, Amber, Rusiecka, Dagmara, Achterberg, Eric P., Gledhill, Martha, Ussher, Simon J., Worsfold, Paul J., Geibert, Walter and Lohan, Maeve C. (2017) Seasonal iron depletion in temperate shelf seas Geophysical Research Letters, 44 (17). pp. 8987-8996. DOI 10.1002/2017GL073881.

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Our study followed the seasonal cycling of soluble (SFe), colloidal (CFe), dissolved (DFe), total dissolvable (TDFe), labile particulate (LPFe) and total particulate (TPFe) iron in the Celtic Sea (NE Atlantic Ocean). Preferential uptake of SFe occurred during the spring bloom, preceding the removal of CFe. Uptake and export of Fe during the spring bloom, coupled with a reduction in vertical exchange, led to Fe deplete surface waters (<0.2 nM DFe; 0.11 nM LPFe, 0.45 nM TDFe, 1.84 nM TPFe) during summer stratification. Below the seasonal thermocline, DFe concentrations increased from spring to autumn, mirroring NO3- and consistent with supply from remineralised sinking organic material, and cycled independently of particulate Fe over seasonal timescales. These results demonstrate that summer Fe availability is comparable to the seasonally Fe limited Ross Sea shelf, and therefore is likely low enough to affect phytoplankton growth and species composition.

Document Type: Article
Additional Information: All data that supports the findings of this study have been submitted to the British Oceanography Data Centre.
Keywords: dissolved iron; colloidal iron; particulate iron; nitrate; Celtic Sea; shelf sea biogeochemistry; RSS Discovery
Research affiliation: OceanRep > GEOMAR > FB2 Marine Biogeochemistry > FB2-CH Chemical Oceanography
Refereed: Yes
DOI etc.: 10.1002/2017GL073881
ISSN: 0094-8276
Date Deposited: 01 Sep 2017 11:47
Last Modified: 09 Oct 2017 07:53

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