Nitrogen Oxide Emissions from U.S. Oil and Gas Production: Recent Trends and Source Attribution

Abstract

Abstract U.S. oil and natural gas production volumes have grown by up to 100% in key production areas between January 2017 and August 2019. Here we show that recent trends are visible from space and can be attributed to drilling, production, and gas flaring activities. By using oil and gas activity data as predictors in a multivariate regression to satellite measurements of tropospheric NO 2 columns, observed changes in NO 2 over time could be attributed to NO x emissions associated with drilling, production and gas flaring for three select regions: the Permian, Bakken, and Eagle Ford basins. We find that drilling had been the dominant NO x source contributing around 80% before the downturn in drilling activity in 2015. Thereafter, NO x contributions from drilling activities and combined production and flaring activities are similar. Comparison of our top‐down source attribution with a bottom‐up fuel‐based oil and gas NO x emission inventory shows agreement within error margins.