摘要：Abstract. High-resolution bottom-up estimation provides a detailed guide forcity greenhouse gas mitigation options, offering details that can increasethe economic efficiency of emissions reduction options and synergize withother urban policy priorities at the human scale. As a critical constraintto urban atmospheric CO2 inversion studies, bottom-upspatiotemporally explicit emissions data products are also necessary toconstruct comprehensive urban CO2 emission information systems usefulfor trend detection and emissions verification. The “Hestia Project” is aneffort to provide bottom-up granular fossil fuel (FFCO2) emissions forthe urban domain with building/street and hourly space–time resolution.Here, we report on the latest urban area for which a Hestia estimate hasbeen completed – the Los Angeles megacity, encompassing five counties: LosAngeles County, Orange County, Riverside County, San Bernardino County andVentura County. We provide a complete description of the methods used tobuild the Hestia FFCO2 emissions data product for the years 2010–2015.We find that the LA Basin emits 48.06 (±5.3) MtC yr−1, dominated by theon-road sector. Because of the uneven spatial distribution of emissions,10 % of the largest-emitting grid cells account for 93.6 %, 73.4 %,66.2 %, and 45.3 % of the industrial, commercial, on-road, andresidential sector emissions, respectively. Hestia FFCO2 emissions are10.7 % larger than the inventory estimate generated by the localmetropolitan planning agency, a difference that is driven by the industrialand electricity production sectors. The detail of the Hestia-LA FFCO2emissions data product offers the potential for highly targeted, efficienturban greenhouse gas emissions mitigation policy. The Hestia-LA v2.5emissions data product can be downloaded from the National Institute ofStandards and Technology repository (https://doi.org/10.18434/T4/1502503, Gurney et al., 2019).
