Seasonal iron depletion in temperate shelf seas

Antony J. Birchill; Angela Milne; E. Malcolm S. Woodward; Carolyn Harris; Amber Annett; Dagmara Rusiecka; Eric P. Achterberg; Martha Gledhill; Simon J. Ussher; Paul J. Worsfold; Walter Geibert; Maeve C. Lohan

doi:10.1002/2017GL073881

Seasonal iron depletion in temperate shelf seas

Antony J. Birchill^*, Angela Milne, E. Malcolm S. Woodward, Carolyn Harris, Amber Annett, Dagmara Rusiecka, Eric P. Achterberg, Martha Gledhill, Simon J. Ussher, Paul J. Worsfold, Walter Geibert, Maeve C. Lohan

^*Corresponding author for this work

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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. 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, 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.

Original language	English
Pages (from-to)	8987-8996
Number of pages	10
Journal	Geophysical Research Letters
Volume	44
Issue number	17
Early online date	14 Sept 2017
DOIs	https://doi.org/10.1002/2017GL073881
Publication status	Published - 26 Sept 2017

Keywords

Celtic Sea
colloidal iron
dissolved iron
nitrate
particulate iron
shelf sea biogeochemistry
UKRI
NERC
NE/L501840/1
NE/K001779/1
NE/K002023/1
NE/K001973/1
NE/K002058/1

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Geophysical Research Letters - 2017 - Birchill - Seasonal iron depletion in temperate shelf seasFinal published version, 986 KBLicence: CC BY

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@article{8f4223b3fe6f4974b058cd1db747bbd5,

title = "Seasonal iron depletion in temperate shelf seas",

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. 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, 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.",

keywords = "Celtic Sea, colloidal iron, dissolved iron, nitrate, particulate iron, shelf sea biogeochemistry, UKRI, NERC, NE/L501840/1, NE/K001779/1, NE/K002023/1, NE/K001973/1, NE/K002058/1",

author = "Birchill, {Antony J.} and Angela Milne and Woodward, {E. Malcolm S.} and Carolyn Harris and Amber Annett and Dagmara Rusiecka and Achterberg, {Eric P.} and Martha Gledhill and Ussher, {Simon J.} and Worsfold, {Paul J.} and Walter Geibert and Lohan, {Maeve C.}",

note = "Funding Information: The authors would like to thank the captain and crew of the RSS Discovery. This project was funded by the UK Natural Environment Research Council (NE/L501840/1 (A.B.), NE/K001779/1 (M.L., S.U., A.M., and P.W.), NE/K002023/1 (W.G. and A.A.), NE/K001973/1 (E.A., D.R., and M.G.), and NE/K002058/1 (E.M.S.W. and CA)). The authors declare no competing financial interest. All data that supports the findings of this study have been submitted to the British Oceanography Data Centre. Publisher Copyright: {\textcopyright}2017. The Authors.",

year = "2017",

month = sep,

day = "26",

doi = "10.1002/2017GL073881",

language = "English",

volume = "44",

pages = "8987--8996",

journal = "Geophysical Research Letters",

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T1 - Seasonal iron depletion in temperate shelf seas

AU - Birchill, Antony J.

AU - Milne, Angela

AU - Woodward, E. Malcolm S.

AU - Harris, Carolyn

AU - Annett, Amber

AU - Rusiecka, Dagmara

AU - Achterberg, Eric P.

AU - Gledhill, Martha

AU - Ussher, Simon J.

AU - Worsfold, Paul J.

AU - Geibert, Walter

AU - Lohan, Maeve C.

N1 - Funding Information: The authors would like to thank the captain and crew of the RSS Discovery. This project was funded by the UK Natural Environment Research Council (NE/L501840/1 (A.B.), NE/K001779/1 (M.L., S.U., A.M., and P.W.), NE/K002023/1 (W.G. and A.A.), NE/K001973/1 (E.A., D.R., and M.G.), and NE/K002058/1 (E.M.S.W. and CA)). The authors declare no competing financial interest. All data that supports the findings of this study have been submitted to the British Oceanography Data Centre. Publisher Copyright: ©2017. The Authors.

PY - 2017/9/26

Y1 - 2017/9/26

N2 - 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, 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.

AB - 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, 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.

KW - Celtic Sea

KW - colloidal iron

KW - dissolved iron

KW - nitrate

KW - particulate iron

KW - shelf sea biogeochemistry

KW - UKRI

KW - NERC

KW - NE/L501840/1

KW - NE/K001779/1

KW - NE/K002023/1

KW - NE/K001973/1

KW - NE/K002058/1

UR - http://www.scopus.com/inward/record.url?scp=85029434635&partnerID=8YFLogxK

UR - https://pearl.plymouth.ac.uk/handle/10026.1/9969

U2 - 10.1002/2017GL073881

DO - 10.1002/2017GL073881

M3 - Article

AN - SCOPUS:85029434635

SN - 0094-8276

VL - 44

SP - 8987

EP - 8996

JO - Geophysical Research Letters

JF - Geophysical Research Letters

IS - 17

ER -

Seasonal iron depletion in temperate shelf seas

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Keywords

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