| ||The MACC Aerosol forcing products are derived from the aerosol fields in the MACC Re-analysis.
First, aerosol optical depths are divided into four classes: anthropogenic, mineral-dust,
sea-salt, and fine-mode natural aerosols. This is done by using aerosol size as a proxy for
aerosol origin. Then, optical properties derived from ground-based sun-photometers are used to
estimate direct effects with respect to no aerosols and, for the anthropogenic component,
direct forcing with respect to natural aerosols. The 1st indirect effect of anthropogenic
aerosols on liquid cloud is also estimated using satellite-derived regional statistics.
The complete dataset is also available on the MACC ftp server: