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Iron supply and demand in an Antarctic shelf ecosystem

Iron supply and demand in an Antarctic shelf ecosystem
Iron supply and demand in an Antarctic shelf ecosystem
The Ross Sea sustains a rich ecosystem and is the most productive sector of the Southern Ocean. Most of this production occurs within a polynya during the November–February period, when the availability of dissolved iron (dFe) is thought to exert the major control on phytoplankton growth. Here we combine new data on the distribution of dFe, high-resolution model simulations of ice melt and regional circulation, and satellite-based estimates of primary production to quantify iron supply and demand over the Ross Sea continental shelf. Our analysis suggests that the largest sources of dFe to the euphotic zone are wintertime mixing and melting sea ice, with a lesser input from intrusions of Circumpolar Deep Water and a small amount from melting glacial ice. Together these sources are in approximate balance with the annual biological dFe demand inferred from satellite-based productivity algorithms, although both the supply and demand estimates have large uncertainties.
iron, Ross Sea, biogeochemical cycling
0094-8276
8088-8097
McGillicuddy, D.J.
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Sedwick, P.N.
852dfecb-125a-46aa-9628-548f0e0911c9
Dinniman, M.S.
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Arrigo, K.R.
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Bibby, T.S.
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Greenan, B.J.W.
503c19a9-5eb3-4dba-95fb-eb49c0225ffa
Hofmann, E.E.
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Klinck, J.M.
141d79c1-c978-4b54-a450-deacd63daf96
Smith, W.O.
467273f8-7baf-4cf6-9a60-4858183e12d7
Mack, S.L.
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Marsay, C.M.
20e01801-1fc0-4711-a5a0-956d9ff5c672
Sohst, B.M.
19692ff8-9ab8-4207-97d0-3202b3db88aa
van Dijken, G.L.
8da7922b-46dd-4b4e-b0b7-667569eb1964
McGillicuddy, D.J.
d2ccd105-b0e7-47b1-8ae8-0a89feeb9df2
Sedwick, P.N.
852dfecb-125a-46aa-9628-548f0e0911c9
Dinniman, M.S.
2b26ecaa-1a83-49df-b592-d74927800173
Arrigo, K.R.
10366c1e-9677-4e88-8ac6-5b9d80a2e149
Bibby, T.S.
e04ea079-dd90-4ead-9840-00882de27ebd
Greenan, B.J.W.
503c19a9-5eb3-4dba-95fb-eb49c0225ffa
Hofmann, E.E.
eea406e9-7105-4f70-885c-0deddb298edc
Klinck, J.M.
141d79c1-c978-4b54-a450-deacd63daf96
Smith, W.O.
467273f8-7baf-4cf6-9a60-4858183e12d7
Mack, S.L.
14cbd4e4-4301-4ff2-98f5-419cac6a28de
Marsay, C.M.
20e01801-1fc0-4711-a5a0-956d9ff5c672
Sohst, B.M.
19692ff8-9ab8-4207-97d0-3202b3db88aa
van Dijken, G.L.
8da7922b-46dd-4b4e-b0b7-667569eb1964

McGillicuddy, D.J., Sedwick, P.N., Dinniman, M.S., Arrigo, K.R., Bibby, T.S., Greenan, B.J.W., Hofmann, E.E., Klinck, J.M., Smith, W.O., Mack, S.L., Marsay, C.M., Sohst, B.M. and van Dijken, G.L. (2015) Iron supply and demand in an Antarctic shelf ecosystem. Geophysical Research Letters, 42 (19), 8088-8097. (doi:10.1002/2015GL065727).

Record type: Article

Abstract

The Ross Sea sustains a rich ecosystem and is the most productive sector of the Southern Ocean. Most of this production occurs within a polynya during the November–February period, when the availability of dissolved iron (dFe) is thought to exert the major control on phytoplankton growth. Here we combine new data on the distribution of dFe, high-resolution model simulations of ice melt and regional circulation, and satellite-based estimates of primary production to quantify iron supply and demand over the Ross Sea continental shelf. Our analysis suggests that the largest sources of dFe to the euphotic zone are wintertime mixing and melting sea ice, with a lesser input from intrusions of Circumpolar Deep Water and a small amount from melting glacial ice. Together these sources are in approximate balance with the annual biological dFe demand inferred from satellite-based productivity algorithms, although both the supply and demand estimates have large uncertainties.

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Published date: 16 October 2015
Keywords: iron, Ross Sea, biogeochemical cycling
Organisations: Ocean and Earth Science

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Local EPrints ID: 384903
URI: http://eprints.soton.ac.uk/id/eprint/384903
ISSN: 0094-8276
PURE UUID: afad2d5d-ceb7-4711-9d55-ce6cd8350bdc

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Date deposited: 09 Dec 2015 14:31
Last modified: 08 Jan 2022 12:27

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Contributors

Author: D.J. McGillicuddy
Author: P.N. Sedwick
Author: M.S. Dinniman
Author: K.R. Arrigo
Author: T.S. Bibby
Author: B.J.W. Greenan
Author: E.E. Hofmann
Author: J.M. Klinck
Author: W.O. Smith
Author: S.L. Mack
Author: C.M. Marsay
Author: B.M. Sohst
Author: G.L. van Dijken

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