Fugitive emissions from the Bakken shale illustrate role of shale production in global ethane shift

Ethane is the second most abundant atmospheric hydrocarbon, exerts a strong influence on tropospheric ozone, and reduces the atmosphere's oxidative capacity. Global observations showed declining ethane abundances from 1984 to 2010, while a regional measurement indicated increasing levels since 2009, with the reason for this subject to speculation. The Bakken shale is an oil and gas-producing formation centered in North Dakota that experienced a rapid increase in production beginning in 2010. We use airborne data collected over the North Dakota portion of the Bakken shale in 2014 to calculate ethane emissions of 0.23 ± 0.07 (2σ) Tg/yr, equivalent to 1–3% of total global sources. Emissions of this magnitude impact air quality via concurrent increases in tropospheric ozone. This recently developed large ethane source from one location illustrates the key role of shale oil and gas production in rising global ethane levels.

[1]  A. Bouwman,et al.  Emission database for global atmospheric research (Edgar) , 1994, Environmental monitoring and assessment.

[2]  E. Kort,et al.  Methane Leaks from North American Natural Gas Systems , 2014, Science.

[3]  Robert W Howarth,et al.  Toward a better understanding and quantification of methane emissions from shale gas development , 2014, Proceedings of the National Academy of Sciences.

[4]  Gabrielle Pétron,et al.  Aircraft-Based Estimate of Total Methane Emissions from the Barnett Shale Region. , 2015, Environmental science & technology.

[5]  R. Dickerson,et al.  Regional air quality impacts of hydraulic fracturing and shale natural gas activity: Evidence from ambient VOC observations , 2014 .

[6]  Gregory J. Frost,et al.  Quantifying sources of methane using light alkanes in the Los Angeles basin, California , 2013 .

[7]  D. Jacob,et al.  Sources contributing to background surface ozone in the US Intermountain West , 2013 .

[8]  R. C. Hudman,et al.  Steps towards a mechanistic model of global soil nitric oxide emissions: implementation and space based-constraints , 2012 .

[9]  G. Etiope,et al.  Earth's Degassing: A Missing Ethane and Propane Source , 2009, Science.

[10]  Can a "state of the art" chemistry transport model simulate Amazonian tropospheric chemistry? , 2011 .

[11]  J. Rudolph,et al.  The tropospheric distribution and budget of ethane , 1995 .

[12]  Gabrielle Pétron,et al.  A new look at methane and nonmethane hydrocarbon emissions from oil and natural gas operations in the Colorado Denver‐Julesburg Basin , 2014 .

[13]  Nicola J. Blake,et al.  Long-term decline of global atmospheric ethane concentrations and implications for methane , 2012, Nature.

[14]  H. Cai,et al.  Energy Intensity and Greenhouse Gas Emissions from Tight Oil Production in the Bakken Formation , 2016 .

[15]  Joseph P. Pinto,et al.  Estimating North American background ozone in U.S. surface air with two independent global models: Variability, uncertainties, and recommendations , 2014 .

[16]  A. Karion,et al.  Understanding high wintertime ozone pollution events in an oil- and natural gas-producing region of the western US , 2014 .

[17]  James G. Speight,et al.  Shale Gas Properties and Processing , 2013 .

[18]  David G. Streets,et al.  Analysis of aircraft and satellite measurements from the Intercontinental Chemical Transport Experiment (INTEX-B) to quantify long-range transport of East Asian sulfur to Canada , 2008 .

[19]  P. M. Lang,et al.  Conversion of NOAA atmospheric dry air CH4 mole fractions to a gravimetrically prepared standard scale , 2005 .

[20]  E. Kort,et al.  Four corners: The largest US methane anomaly viewed from space , 2014 .

[21]  L. Horowitz,et al.  Ozone and organic nitrates over the eastern United States: Sensitivity to isoprene chemistry , 2013 .

[22]  J. Herman,et al.  Atmospheric chemistry of ethane and ethylene , 1982 .

[23]  C. Boone,et al.  Retrieval of ethane from ground-based FTIR solar spectra using improved spectroscopy: Recent burden increase above Jungfraujoch , 2015 .

[24]  Jeff Peischl,et al.  Quantifying atmospheric methane emissions from the Haynesville, Fayetteville, and northeastern Marcellus shale gas production regions , 2015 .

[25]  J. Randerson,et al.  Analysis of daily, monthly, and annual burned area using the fourth‐generation global fire emissions database (GFED4) , 2013 .

[26]  Steven Pawson,et al.  HEMCO v1.0: A Versatile, ESMF-Compliant Component for Calculating Emissions in Atmospheric Models , 2014 .

[27]  Seongeun Jeong,et al.  On the sources of methane to the Los Angeles atmosphere. , 2012, Environmental science & technology.

[28]  Kelly Chance,et al.  Can a "state of the art" chemistry transport model simulate Amazonian tropospheric chemistry? , 2011 .

[29]  Gabrielle Pétron,et al.  Methane emissions estimate from airborne measurements over a western United States natural gas field , 2013 .

[30]  Oliver Wild,et al.  Fast-J: Accurate Simulation of In- and Below-Cloud Photolysis in Tropospheric Chemical Models , 2000 .

[31]  Donald H. Lenschow,et al.  A Low-Cost System for Measuring Horizontal Winds from Single-Engine Aircraft , 2014 .

[32]  William J. Koshak,et al.  Optimized regional and interannual variability of lightning in a global chemical transport model constrained by LIS/OTD satellite data , 2012 .

[33]  Daniel J. Jacob,et al.  Global Budget of Ethane and Regional Constraints on U.S. Sources , 2008 .

[34]  D. Blake,et al.  Global atmospheric concentrations and source strength of ethane , 1986, Nature.

[35]  M. Zahniser,et al.  Demonstration of an ethane spectrometer for methane source identification. , 2014, Environmental science & technology.

[36]  M. L. Smith,et al.  Black Carbon Emissions from the Bakken Oil and Gas Development Region , 2015 .

[37]  Timothy J. Wallington,et al.  Estimation of direct radiative forcing due to non-methane hydrocarbons , 1999 .

[38]  Colm Sweeney,et al.  Airborne Ethane Observations in the Barnett Shale: Quantification of Ethane Flux and Attribution of Methane Emissions. , 2015, Environmental science & technology.

[39]  Richard G. Derwent,et al.  The Oxidation of Organic Compounds in the Troposphere and their Global Warming Potentials , 2002 .

[40]  C. Sweeney,et al.  High winter ozone pollution from carbonyl photolysis in an oil and gas basin , 2014, Nature.

[41]  Allen H. Goldstein,et al.  Seasonal variations of nonmethane hydrocarbons in rural New England: Constraints on OH concentrations in northern midlatitudes , 1995 .