Representation of Fe complexation by 2 ligands in a global biogeochemical model and its effects on Fe solubility and distribution


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Ying.Ye [ at ] awi.de

Abstract

Complexation with organic ligands controls the solubility of iron in the surface ocean; together with particle adsorption it determines bioavailability and residence time of dust-deposited iron. Assumptions on ligand abundance are therefore critical for biogeochemical models that include iron. Instead of fixing organic ligands to an observed mean concentration, a mechanistic description of ligand dynamics has been implemented in a 3D model. Two classes of ligands are considered: strong and weak, with different biogenic sources, photochemical reactivity and microbial degradation rates. Results of sensitivity studies show that including two ligands improves the model-data fit significantly compared to a model with only one ligand class or with constant ligand concentration. We use our model to investigate the role of organic ligands in controlling the fate of aerosol iron in a changing climate and future primary production; to isolate the effects we compare model runs with and without changes in ligand distribution.



Item Type
Conference (Poster)
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Primary Division
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Peer revision
Not peer-reviewed
Publication Status
Published
Event Details
SOLAS Meeting, 07 Sep 2015 - 11 Sep 2015, Kiel.
Eprint ID
39078
Cite as
Ye, Y. , Völker, C. and Tagliabue, A. (2015): Representation of Fe complexation by 2 ligands in a global biogeochemical model and its effects on Fe solubility and distribution , SOLAS Meeting, Kiel, 7 September 2015 - 11 September 2015 .


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