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Solubility of iron in the Southern Ocean

Solubility of iron in the Southern Ocean
Solubility of iron in the Southern Ocean
Iron solubility (cFeS) ranged from 0.4 to 1.5 nmol L?1, decreasing from south to north in three different Southern Ocean zones (the Coastal Zone, the Antarctic Zone, and the Polar Frontal Zone plus the Subantarctic Zone). This decrease was at times correlated with an increase in temperature. Organic Fe solubility (cFeS,org), which was obtained by subtracting from total measured Fe solubility the solubility of inorganic species of iron (Fe) at the measurement temperature (20°C), ranged from 0.3 to 1.3 nmol L?1, representing an average of 32 ± 14% of the concentration of ligands in the dissolved size fraction as determined via competitive ligand exchange–absorptive cathodic stripping voltammetry (barring a handful of extremely high values from a transect run to the east of Prydz Bay). Values of cFeS were mainly lower than the predicted value for inorganic Fe solubility at the in situ temperature. Total in situ Fe solubility (cFeS,adj) was therefore estimated by adjusting for inorganic Fe solubility at in situ temperatures (between ?2°C and +18°C). Because in situ temperatures in the Antarctic Circumpolar Current were mostly lower than +3°C, such cFeS,adj values, ranging from 0.5 to 1.8 nmol L?1, were roughly twice as large as cFeS,org. The adjustment relies heavily on model calculations of inorganic Fe solubility but, if correct, indicates that the bulk of the solubility of Fe in the cold waters of the Southern Ocean is tied to the solubility of inorganic Fe rather than to Fe ligands in the soluble size fraction.
0024-3590
684-697
Schlosser, Christian
93df4206-5ae4-48a3-80b9-d6f4fc2d4b0a
De La Rocha, Christina
ffedd962-d39a-4fec-9a8d-b998467baf5f
Streu, Peter
fecc89e2-d304-4f0c-b83a-f23754dd36d6
Croot, Peter L.
92a5b714-85e5-4ea2-82d2-7034ab901557
Schlosser, Christian
93df4206-5ae4-48a3-80b9-d6f4fc2d4b0a
De La Rocha, Christina
ffedd962-d39a-4fec-9a8d-b998467baf5f
Streu, Peter
fecc89e2-d304-4f0c-b83a-f23754dd36d6
Croot, Peter L.
92a5b714-85e5-4ea2-82d2-7034ab901557

Schlosser, Christian, De La Rocha, Christina, Streu, Peter and Croot, Peter L. (2012) Solubility of iron in the Southern Ocean. Limnology and Oceanography, 57 (3), 684-697. (doi:10.4319/lo.2012.57.3.0684).

Record type: Article

Abstract

Iron solubility (cFeS) ranged from 0.4 to 1.5 nmol L?1, decreasing from south to north in three different Southern Ocean zones (the Coastal Zone, the Antarctic Zone, and the Polar Frontal Zone plus the Subantarctic Zone). This decrease was at times correlated with an increase in temperature. Organic Fe solubility (cFeS,org), which was obtained by subtracting from total measured Fe solubility the solubility of inorganic species of iron (Fe) at the measurement temperature (20°C), ranged from 0.3 to 1.3 nmol L?1, representing an average of 32 ± 14% of the concentration of ligands in the dissolved size fraction as determined via competitive ligand exchange–absorptive cathodic stripping voltammetry (barring a handful of extremely high values from a transect run to the east of Prydz Bay). Values of cFeS were mainly lower than the predicted value for inorganic Fe solubility at the in situ temperature. Total in situ Fe solubility (cFeS,adj) was therefore estimated by adjusting for inorganic Fe solubility at in situ temperatures (between ?2°C and +18°C). Because in situ temperatures in the Antarctic Circumpolar Current were mostly lower than +3°C, such cFeS,adj values, ranging from 0.5 to 1.8 nmol L?1, were roughly twice as large as cFeS,org. The adjustment relies heavily on model calculations of inorganic Fe solubility but, if correct, indicates that the bulk of the solubility of Fe in the cold waters of the Southern Ocean is tied to the solubility of inorganic Fe rather than to Fe ligands in the soluble size fraction.

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Published date: 2012
Organisations: Ocean Biochemistry & Ecosystems

Identifiers

Local EPrints ID: 347121
URI: http://eprints.soton.ac.uk/id/eprint/347121
ISSN: 0024-3590
PURE UUID: c28b3e98-3628-44d0-b738-03dbfe3424c2

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Date deposited: 16 Jan 2013 16:51
Last modified: 14 Mar 2024 12:46

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Contributors

Author: Christian Schlosser
Author: Christina De La Rocha
Author: Peter Streu
Author: Peter L. Croot

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