Seasonal iron depletion in temperate shelf seas
Seasonal iron depletion in temperate shelf seas
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. Uptakeand 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, and 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 remineralized 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.
8987-8996
Birchill, Antony J.
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Milne, Angela
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Woodward, E. Malcolm S.
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Harris, Carolyn
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Annett, Amber
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Rusiecka, Dagmara
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Achterberg, Eric P.
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Gledhill, Martha
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Ussher, Simon J.
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Worsfold, Paul J.
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Geibert, Walter
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Lohan, Maeve C.
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16 September 2017
Birchill, Antony J.
4339f836-8fc9-477b-9d25-bfa20d417f0a
Milne, Angela
e496b797-6206-414e-8f50-d2f2ce260fc9
Woodward, E. Malcolm S.
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Harris, Carolyn
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Annett, Amber
de404d72-7e90-4dbd-884a-1df813808276
Rusiecka, Dagmara
70c9f91b-6ed5-451a-bccb-832fb7022724
Achterberg, Eric P.
685ce961-8c45-4503-9f03-50f6561202b9
Gledhill, Martha
da795c1e-1489-4d40-9df1-fc6bde54382d
Ussher, Simon J.
32006952-df4b-4364-8aae-7b9be1f39745
Worsfold, Paul J.
2edcddc5-ce8e-4f9f-8628-216a26921979
Geibert, Walter
c3679aba-8aab-40ec-ae0e-2112a4c6d471
Lohan, Maeve C.
6ca10597-2d0f-40e8-8e4f-7619dfac5088
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 and Lohan, Maeve C.
(2017)
Seasonal iron depletion in temperate shelf seas.
Geophysical Research Letters, 44 (17), .
(doi:10.1002/2017GL073881).
Abstract
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. Uptakeand 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, and 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 remineralized 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.
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Birchill_et_al-2017-Geophysical_Research_Letters
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Accepted/In Press date: 3 August 2017
e-pub ahead of print date: 14 September 2017
Published date: 16 September 2017
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Local EPrints ID: 415106
URI: http://eprints.soton.ac.uk/id/eprint/415106
ISSN: 1944-8007
PURE UUID: 194ba34b-b638-41c6-850f-cda1eb7e453b
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Date deposited: 30 Oct 2017 17:30
Last modified: 16 Mar 2024 04:30
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Contributors
Author:
Antony J. Birchill
Author:
Angela Milne
Author:
E. Malcolm S. Woodward
Author:
Carolyn Harris
Author:
Dagmara Rusiecka
Author:
Martha Gledhill
Author:
Simon J. Ussher
Author:
Paul J. Worsfold
Author:
Walter Geibert
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