The GSFC EPIC/MERRA2 L3 1x1deg Monthly Tropospheric Column Ozone product (TrCO3_Monthly_EPIC) contains tropospheric column ozone amounts averaged by month from 2015 to present. Measurements from four UV channels of the Earth Polychromatic Imaging Camera (EPIC) on the Deep Space Climate ObserVatoRy (DSCOVR) are used to reconstruct distributions of global ozone. Tropospheric column ozone (TCO) is derived by subtracting the stratospheric column ozone (SCO) estimated from the Modern-Era Retrospective analysis for Research and Applications, Version 2 (MERRA2) ozone fields.

The data are stored in a single netCDF (classic) file. Data are averaged monthly at 1 degree x 1 degree resolution globally. The single data file size is 31.1 MB.