A new global anthropogenic SO2 emission inventory for the last decade: A mosaic of satellite-derived and bottom-up emissions

Sulfur dioxide (SO2) has a significant effect on global and regional climate by changing radiative forcing and contributes to acid deposition that damages aquatic and terrestrial ecosystems.

We have combined satellite-based emissions for large sources with a bottom-up inventory HTAP derived from reported fossil fuel combustion for smaller sources, to construct a new inventory OMI-HATP.

Product features

  • includes emissions from satellite-detected sources that are missing from previous leading bottom-up inventories
  • improves the model agreement with observations, in particular over the US
map of SO2 emissions in the OMI-HTAP inventory

Improved model performance with the new emission product OMI-HTAP

map of SO2 emissions in the OMI-HTAP inventory

Above: (a) map of SO2 emissions in the OMI-HTAP inventory. (b) The differences of annual averaged SO2 surface concentrations between in-situ measurements and the modelled SO2 using the bottom-up inventory HTAP and (c) our new OMI-HTAP inventory.

Data Sources:

Satellite-derived emission estimates are based on SO2 measurements from the Aura Ozone Monitoring Instrument (OMI). OMI is a Dutch–Finnish contribution to the NASA Aura mission.

Technical Description of Figure:

This figure shows the spatial distribution of SO2 emissions in the OMI-HTAP inventory and the improved consistency of the modelled SO2 with measurements. The OMI-HTAP inventory provides monthly gridded SO2 emissions with global coverage at a spatial resolution of 0.1° × 0.1°. OMI-HTAP is available for the period from 2005 to 2017. The accuracy of OMI-HTAP has been evaluated by comparing modelled surface SO2 concentrations to the measurements from ground-based air-quality monitoring networks. Model simulations using OMI-HTAP show considerably better agreement with in situ measurements compared with those using the bottom-up inventory. The new emission database, OMI-HTAP, can be used on its own to capture the spatial and temporal variations in SO2 emissions. It can also be used to support climate and air quality modelling.

Scientific significance, societal relevance, and relationships to future missions:

OMI-HTAP is novel in that it is the first inventory with inclusion of nearly 40 OMI-detected sources that are not captured in previous leading bottom-up inventories. It enables more accurate emission estimates for regions with such missing sources, e.g., the Middle East and Mexico. OMI-HTAP provides dynamic emissions for over 400 OMI-based large sources since 2005, allowing for updates to the emissions over time. OMI-HTAP with accurate location information of each large point source contributes to correction of the mislocated emissions in bottom-up inventories. The accuracy of the inventory can be substantially improved in the future using observations from the recently launched TROPOspheric Monitoring Instrument (TROPOMI) on the ESA Sentinel-5 Precursor satellite featuring even higher spatial resolution than OMI. More accurate estimates for diurnally and seasonally varying emissions can be expected using upcoming geostationary satellite instruments, e.g., NASA Tropospheric Emissions: Monitoring of Pollution (TEMPO), which will enable estimations for different times of the day.

References: Liu, F., Choi, S., Li, C., Fioletov, V. E., McLinden, C. A., Joiner, J., Krotkov, N. A., Bian, H., Janssens-Maenhout, G., Darmenov, A. S., and da Silva, A. M.: A new global anthropogenic SO2 emission inventory for the last decade: a mosaic of satellite-derived and bottom-up emissions, Atmos. Chem. Phys., 18, 16571-16586, https://doi.org/10.5194/acp-18-16571-2018, 2018..


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