3D Gridded Dataset: NOx and VOC regional/sectoral source contributions to monthly averaged tropospheric ozone over South America for 2000-2018

The two netcdf files SAM-MONTHLYO3.NT_2000-2018.nc and SAM-MONTHLYO3.VT_2000-2018.nc contain cropped model output over the South American region from global CAM-Chem simulations enabled with NOx-tagging (NT) and VOC-tagging (VT) respectively. The data is available at a monthly temporal resolution for the 19-year period (2000-2018) with a horizontal spatial resolution of 1.9 deg x 2.5 deg and 40 vertical levels spanning from the surface to ~44hPa. The 3-lettered codes in the variable names refer to the following: NOx-tagging: AIR - global aircraft NOxBIO - global biogenic NOxBMB - global biomass burning NOxCAS - Central Asia anthropogenic NOxEAS - East Asia anthropogenic NOxEUR - European anthropogenic NOxINI - Initial condition unattributed ozone (diminishes with spin-up)LGT - Global lightning NOxMCA - Mexico & Central American anthropogenic NOxMDE - Middle Eastern anthropogenic NOxNAF - North African anthropogenic NOxNAM - North American anthropogenic NOxNRW - Rest-of-the-World anthropogenic NOxRBU - Russia+Belarus+Ukraine anthropogenic NOxSAS - South Asian anthropogenic NOxSEA - Southeast Asian anthropogenic NOxSHIP - Global shipping NOxSTR - Stratospheric intrusion including N2O contributionXTR - extra unattributed ozone VOC-tagging: AIR - global aircraft VOCBIO - global biogenic VOCBMB - global biomass burning VOCCH4 - global background methaneEAS - East Asian anthropogenic VOCEUR - European anthropogenic VOCMDE - Middle Eastern anthropogenic VOCNAM - North American anthropogenic VOCOCN - Oceanic VOC (natural DMS emissions)RBU - Russia+Belarus+Ukraine anthropogenic VOCSAS - South Asian anthropogenic VOCSHP - Global shipping anthropogenic VOCSTR - Stratospheric contributionVRW - Rest-of-the-World anthropogenic VOCXTR - extra unattributed ozone Rest-of-the-World source region is larger for the VOC-tagging simulation since it also contains some of the explicitly defined source regions for NOx-tagging which are not defined separately for VOC-tagging. For specific region definitions, the user should refer to Figure 1 and Table 1 in Ansari et al. (2025).