Subtropical southern Africa top-down biomass burning NOx and NH3 emissions for the 2019 fire season derived with satellite observations and the GEOS-Chem model

Data generated for the paper entitled "Subtropical southern Africa fire emissions of nitrogen oxides and ammonia obtained with satellite observations and GEOS-Chem" submitted for peer-review to Royal Society's Environmental Science: Atmospheres journal.All the data are gridded to 0.25 degree latitude by 0.3125 degree longitude for the year 2019.The data include:(1) IASI NH3 monthly mean column densities for June-October from IASI instruments onboard MetOp-A and MetOp-B sensors reprocessed using GEOS-Chem a priori profiles. The IASI retrieval product used is version 4.0.0. Data are in files named with the format "iasi-metopa-metopb-gc-prior-[inventory]-nh3-cols.nc", where [inventory] is either "finnv25" for FINN version 2.5, "gfedv4s" for GFED version 4 with small fires, or "gfasv12" for GFAS version 1.2 for the three separate biomass burning inventories that were used to drive the model. (2) Top-down NOx and NH3 biomass burning emissions for 2019 obtained by applying a mass-balance approach to satellite observations and GEOS-Chem. NOx emissions are for June-October. NH3 emissions are for July-October. Only non-negative NH3 emissions are summed and use to report monthly and biomass burning season totals in the accompanying manuscript. Emissions data are in files named with the format "top-down-bb-[compound]-emis.nc", where [compound] is either NOx or NH3.(3) GEOS-Chem monthly mean tropospheric column densities of NO2 and total column densities of NH3 for June-October 2019. These are obtained by co-sampling with TROPOMI and applying the TROPOMI averaging kernel for NO2 and co-sampling with IASI for NH3. Model data are averaged over 13h00-14h00 local solar time (LST) for coincidence with IASI and 09h00-10h00 LST for coincidence with IASI. Model data are in files named with the format "geos-chem-no2-nh3-cols-[inventory].nc", where [inventory] is either "finnv25" for FINN version 2.5, "gfedv4s" for GFED version 4 with small fires, or "gfasv12" for GFAS version 1.2.