RT Journal Article SR 00 ID 10.1088/1748-9326/aa583e A1 Höglund-Isaksson, L. T1 Bottom-up simulations of methane and ethane emissions from global oil and gas systems 1980 to 2012 JF Environmental Research Letters YR 2017 FD 2017-12-20 VO 12 IS 2 SP e024007 AB Existing bottom-up emission inventories of methane from global oil and gas systems do not well explain year-on-year variation in atmospheric methane estimated by top-down models. Using a novel bottom-up approach this study quantifies and attributes methane and ethane emissions from global oil and gas production from 1980 to 2012. Country-specific information on associated gas flows from published sources are combined with inter-annual variations in observed flaring of associated gas from satellite images from 1994 to 2010, to arrive at country-specific annual estimates of methane and ethane emissions from flows of associated gas. Results confirm trends from top-down models and indicate considerably higher methane and ethane emissions from oil production than previously shown in bottom-up inventories for this time period. PB Institute of Physics Publishing (IOP) SN 1748-9326 LK https://pure.iiasa.ac.at/id/eprint/14230/