Global Intercomparisons of Emissions, Air Quality and Human Health Impacts from CEDS, ECLIPSEv6b and EDGARv5

There exists substantial spatial and temporal variability of gridded short-lived climate forcers (SLCFs) emissions from the state-of-the-science global bottom-up anthropogenic emission inventories, which results in uncertainties in atmospheric chemistry, air quality and human health impacts. In this study, we firstly inter-compared the global annual total and spatial variability of SLCFs for the year 2015 from the Community Emissions Data System (CEDS), the Evaluating of the Climate and Air Quality Impacts of Short-Lived Pollutants version 6b (ECLIPSEv6b), and the Emissions Database for Global Atmospheric Research version 5.0 (EDGARv5). We then employed the Community Atmosphere Model with chemistry version 6.0 (CAM6-Chem) within the NCAR Community Earth System Model version 2.1.3 at the horizontal resolution of 0.95° latitude by 1.25° longitude to quantify the atmospheric chemistry and air quality impacts from the above three anthropogenic emission inventories, with a focus on PM2.5 (particulate matter with aerodynamic diameters equal or less than 2.5 micrometers) and ozone. We find that there are substantial differences in terms of global annual total and spatial variability of emissions for SLCFs among CEDS, ECLIPSEv6b and EDGARv5. Our preliminary analyses show that global annual total black carbon (BC), organic carbon (OC) and ammonia (NH3) emissions in CEDS for the year 2015 are 18.4%, 18.2%, and 21.1% higher, compared with the emissions from EDGARv5. However, global annual total carbon monoxide (CO) emissions from CEDS are 12.5% lower than that from EDGARv5. For nitrogen oxides (NOx), sulfur dioxide (SO2), and non-methane volatile organic compounds (NMVOCs), global annual total emissions between CEDS and EDGARv5 in 2015 are comparable. Global annual total BC, NOx, and NH3 emissions from ECLIPSEv6b in 2015 are 5.1%, 2.3% and 2.5% higher than the values from CEDS, whereas global annual total emissions of OC, SO2, CO and NMVOCs in ECLIPSEv6b are 0.8%, 20.4%, 3.2% and 25.2% smaller than that from CEDS. Lastly, an inter-comparison of global human health impacts from CEDS, ECLIPSEv6b and EDGARv5 attributable to PM2.5 and ozone exposure will be presented.