Ye, Ying; Völker, Christoph (2017): Dust-deposited lithogenic particles in the iron cycle in the tropical and subtropical Atlantic, link to model results in NetCDF format [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.877800,

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Supplement to: Ye, Y; Völker, C (2017): On the Role of Dust-Deposited Lithogenic Particles for Iron Cycling in the Tropical and Subtropical Atlantic. Global Biogeochemical Cycles, 31(10), 1543-1558, https://doi.org/10.1002/2017GB005663

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 as well as scavenging on both organic and lithogenic particles. Considering the additional scavenging of iron on lithogenic particles, the modelled 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.

Two NetCDF files are provided here. 'dust236_gbc.nc' is the output of the '+Lith' run (see reference) and 'dust236_noscav_gbc.nc' is that of '-Lith'. Each data set contains 4 tracers in the model: carbon in detritus, dissolved iron, dust particles and lithogenic part of aggregates. The horizontal dimension is 180x126 and there are 30 vertical layers. The model is run for 100 years and just the annual average of the last year is saved in the files.