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Reviews and syntheses: the GESAMP atmospheric iron deposition model intercomparison study

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Myriokefalitakis, S, Ito, A, Kanakidou, M, Nenes, A, Krol, MC, Mahowald, NM, Scanza, RA, Hamilton, DS, Johnson, MS, Meskhidze, N, Kok, JF, Guieu, C, Baker, AR, Jickells, TD, Sarin, MM, Bikkina, S, Shelley, R, Bowie, A ORCID: 0000-0002-5144-7799, Perron, MMG and Duce, RA 2018 , 'Reviews and syntheses: the GESAMP atmospheric iron deposition model intercomparison study' , Biogeosciences, vol. 15 , pp. 6659-6684 , doi: 10.5194/bg-15-6659-2018.

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Abstract

The model intercomparison analysis indicates that the representation of theatmospheric Fe cycle varies among models, in terms of both the magnitude ofnatural and combustion Fe emissions as well as the complexity of atmosphericprocessing parameterizations of Fe-containing aerosols. The model comparisonwith aerosol Fe observations over oceanic regions indicates that most modelsoverestimate surface level TFe mass concentrations near dust sourceregions and tend to underestimate the low concentrations observed in remoteocean regions. All models are able to simulate the tendency of higher Feconcentrations near and downwind from the dust source regions, with the meannormalized bias for the Northern Hemisphere (∼14), largerthan that of the Southern Hemisphere (∼2.4) for the ensemble modelmean. This model intercomparison and model–observation comparison studyreveals two critical issues in LFe simulations that require furtherexploration: (1) the Fe-containing aerosol size distribution and (2) therelative contribution of dust and combustion sources of Fe to labile Fe inatmospheric aerosols over the remote oceanic regions.

Item Type: Article
Authors/Creators:Myriokefalitakis, S and Ito, A and Kanakidou, M and Nenes, A and Krol, MC and Mahowald, NM and Scanza, RA and Hamilton, DS and Johnson, MS and Meskhidze, N and Kok, JF and Guieu, C and Baker, AR and Jickells, TD and Sarin, MM and Bikkina, S and Shelley, R and Bowie, A and Perron, MMG and Duce, RA
Keywords: GESAMP, atmospheric iron deposition, model intercomparison
Journal or Publication Title: Biogeosciences
Publisher: Copernicus GmbH
ISSN: 1726-4170
DOI / ID Number: 10.5194/bg-15-6659-2018
Copyright Information:

© Author(s) 2018. Licensed under Creative Commons Attribution 4.0 International (CC BY 4.0) http://creativecommons.org/licenses/by/4.0/

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