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Wadley, Martin R., Stevens, David P. 
ORCID: https://orcid.org/0000-0002-7283-4405, Jickells, Tim D., Hughes, Claire, Chance, Rosie, Hepach, Helmke, Tinel, Liselotte and Carpenter, Lucy J.
(2020)
A global model for iodine speciation in the upper ocean.
Global Biogeochemical Cycles, 34 (9).
ISSN 0886-6236
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Abstract
An ocean iodine cycling model is presented, which predicts upper ocean iodine speciation. The model comprises a three-layer advective and diffusive ocean circulation model of the upper ocean and an iodine cycling model embedded within this circulation. The two primary reservoirs of iodine are represented, iodide and iodate. Iodate is reduced to iodide in the mixed layer in association with primary production, linked by an iodine to carbon (I:C) ratio. A satisfactory model fit with observations cannot be obtained with a globally constant I:C ratio, and the best fit is obtained when the I:C ratio is dependent on sea surface temperature, increasing at low temperatures. Comparisons with observed iodide distributions show that the best model fit is obtained when oxidation of iodide back to iodate is associated with mixed layer nitrification. Sensitivity tests, where model parameters and processes are perturbed, reveal that primary productivity, mixed layer depth, oxidation, advection, surface freshwater flux, and the I:C ratio all have a role in determining surface iodide concentrations, and the timescale of iodide in the mixed layer is sufficiently long for nonlocal processes to be important. Comparisons of the modeled iodide surface field with parameterizations by other authors show good agreement in regions where observations exist but significant differences in regions without observations. This raises the question of whether the existing parameterizations are capturing the full range of processes involved in determining surface iodide and shows the urgent need for observations in regions where there are currently none.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | iodine,model,ocean,global and planetary change,environmental chemistry,environmental science(all),atmospheric science ,/dk/atira/pure/subjectarea/asjc/2300/2306 |
| Faculty \ School: | Faculty of Science > School of Mathematics (former - to 2024) Faculty of Science > School of Environmental Sciences University of East Anglia Research Groups/Centres > Theme - ClimateUEA |
| UEA Research Groups: | Faculty of Science > Research Groups > Centre for Ocean and Atmospheric Sciences Faculty of Science > Research Groups > Fluid and Solid Mechanics (former - to 2024) Faculty of Science > Research Groups > Fluids & Structures Faculty of Science > Research Groups > Numerical Simulation, Statistics & Data Science |
| Related URLs: | |
| Depositing User: | LivePure Connector |
| Date Deposited: | 23 Jul 2020 23:47 |
| Last Modified: | 07 Nov 2024 12:42 |
| URI: | https://ueaeprints.uea.ac.uk/id/eprint/76256 |
| DOI: | 10.1029/2019GB006467 |
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