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Sulfate aerosols from natural and anthropogenic sources

I am examining the effects of aerosols on climate using CCSM at T31. One of the scenarios I would like to perform is running CCSM with varying sulfate aerosols from anthropogenic sources only. My question is where I can get sulfate aerosols separately from natural (DMS, volcano, biomass burning) and anthropogenic sources for input into CCSM. Since I am using the aerosol input file named "AerosolMass_V_48x96_clim_c031029.nc", it would be great if someone can advise me on how to partition the sulfate aerosols in this file between natural and anthropogenic sources.

Thanks,
Yongxin
 
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