On the Role of Dust-Deposited Lithogenic Particles for Iron Cycling in the Tropical and Subtropical Atlantic.

Ye, Y. and Völker, C. (2017) On the Role of Dust-Deposited Lithogenic Particles for Iron Cycling in the Tropical and Subtropical Atlantic. Open Access Global Biogeochemical Cycles, 31 (10). pp. 1543-1558. DOI 10.1002/2017GB005663.

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Abstract

Lithogenic material deposited as dust is one of the major sources of trace metals to the ocean, particularly in the tropical and subtropical Atlantic. On the other hand, it can also act as a scavenging surface for iron. Here we studied this double role of lithogenic material in the marine iron cycle by adding a new scheme for describing particle dynamics into a global biogeochemistry and ecosystem model including particle aggregation and disaggregation of two particle size classes and scavenging on both organic and lithogenic particles. Considering the additional scavenging of iron on lithogenic particles, the modeled dissolved iron concentration is reduced significantly in the tropical and subtropical Atlantic, bringing the model much closer to observations. This underlines the necessity to consider the double role of dust particles as iron source and sink in studies on the marine iron cycle in high dust regions and with changing dust fluxes.

Document Type: Article
Keywords: dust particles; iron; scavenging; tropical and subtropical Atlantic
Refereed: Yes
Open Access Journal?: No
DOI etc.: 10.1002/2017GB005663
ISSN: 0886-6236
Projects: PalMod, SOPRAN
Date Deposited: 13 Sep 2018 10:39
Last Modified: 13 Sep 2018 10:39
URI: http://oceanrep.geomar.de/id/eprint/44276

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