The CONCERTO bottom-up dataset is an emission inventory of isoprene emissions generated by the MEGANv2.1 model (Guenther et al., 2012) coupled with the multi-layer canopy environment model MOHYCAN (Müller et al., 2008) and driven by ECMWF ERA5 meteorological fields.
The drought activity factor γd is calculated based on the offline Parameterized Drought Stress (PDS) parameterisation accounting for the substrate supply γSUB following Wang et al. (2022). Drought severity is quantified by the ratio fPET = AET/PET, defined as the ratio of actual evapotranspiration (AET) to potential evapotranspiration (PET), the latter calculated using the Penman-Monteith equation (Allen et al., 1998). Daily averaged values of fPET are derived from AET flux using ERA5-Land meteorological fields (Muñoz-Sabater et al., 2021), whereas PET is calculated from meteorological variables obtained from ERA5 (Hersbach et al., 2020). A 7-day running mean of fPET is subsequently normalised at each grid cell to the 0-1 range, where the value of 1 corresponds to the 95th percentile over the 2004-2024 period.
The resulting dataset CONCERTO is daily updated between 2005 and 2024 and is described in detail in Opacka et al. (in preparation). This study shows that changes in emissions and seasonality implied by the drought factor are largely supported by evaluations of a global chemistry-transport model against satellite isoprene observations from the Cross-track Infrared Sounder (CrIS) (Wells et Millet, 2022).
We provide annual NetCDF files containing the global daily emission inventory on a 0.5°×0.5° grid for the period 2005–2024. Each year is in a NC file (size 740Mb) and a Zip file, containing all data, is provided too.
Each file includes 720 longitude points (179.75°W to 179.75°E), 360 latitude points (89.75°S to 89.75°N) and 365/366 daily index points (1-365/366).
The files contain two main daily variables:
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isoprene_flux: isoprene fluxes (in molec. cm-2 s-1), where the effect of drought stress is neglected.
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drought_factor: drought factor (ranging from 0 to 1) based on the offline PDS substrate-supply parameterisation (γd=γSUB in Wang et al., 2022), representing a daily activity factor applied as a multiplicative correction to the isoprene fluxes above to account for drought stress.
