Toward Accurate, Policy-Relevant Fossil Fuel CO2 Emission LandscapesClick to copy article linkArticle link copied!
- Kevin Robert Gurney*Kevin Robert Gurney*Email: [email protected]School of Informatics, Computing, and Cyber Systems, Northern Arizona University, Flagstaff, Arizona 85287, United StatesSchool of Life Sciences, Arizona State University, Tempe, Arizona 85281, United StatesMore by Kevin Robert Gurney
- Yang SongYang SongSchool of Informatics, Computing, and Cyber Systems, Northern Arizona University, Flagstaff, Arizona 85287, United StatesMore by Yang Song
- Jianming LiangJianming LiangSchool of Life Sciences, Arizona State University, Tempe, Arizona 85281, United StatesMore by Jianming Liang
- Geoffrey RoestGeoffrey RoestSchool of Informatics, Computing, and Cyber Systems, Northern Arizona University, Flagstaff, Arizona 85287, United StatesMore by Geoffrey Roest
Abstract

The bottom-up (BU) approach has been used to develop spatiotemporally resolved, sectorally disaggregated fossil fuel CO2 (FFCO2) emission data products. These efforts are critical constraints to atmospheric assessment of anthropogenic fluxes in addition to offering the climate change policymaking community usable information to guide mitigation. In the United States, there are two high-resolution FFCO2 emission data products, Vulcan and the Anthropogenic Carbon Emissions System (ACES). As a step toward developing improved, accurate, and detailed FFCO2 emission landscapes, we perform a comparison of the two data products. We find that while agreeing on total FFCO2 emissions at the aggregate scale (relative difference = 1.7%), larger differences occur at smaller spatial scales and in individual sectors. Differences in the smaller-emitting sectors are likely errors in ACES input data or emission factors. ACES advances the approach for estimating emissions in the gas and oil sector, while Vulcan shows better geocoordinate correction in the electricity production sector. Differences in the subcounty residential and commercial building sectors are driven by different spatial proxies and suggest a task for future investigation. The gridcell absolute median relative difference, a measure of the average gridcell-scale relative difference, indicates a 53.5% difference. The recommendation for improved BU granular FFCO2 emission estimation includes review, assessment, and archive of point source geolocations, CO emission input data, CO and CO2 emission factors, and uncertainty approaches including those due to spatial errors. Finally, intensives where local utility data are publicly available could test the spatial proxies used in estimating residential and commercial building emissions. These steps toward best practices will lead to more accurate, granular emissions, enabling optimal emission mitigation policy choices.
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