Seasonal iron depletion in temperate shelf seas
- Birchill, Antony J.
- Milne, Angela
- Woodward, E. Malcolm S.
- Harris, Carolyn
- Annett, Amber
- Rusiecka, Dagmara
- Achterberg, Eric P.
- Gledhill, Martha
- Ussher, Simon J.
- Worsfold, Paul J.
- Geibert, Walter
- Lohan, Maeve C.
DOIAbstract
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...
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