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Journal article
Evaluating oil and gas contributions to ambient nonmethane hydrocarbon mixing ratios and ozone-related metrics in the Colorado Front Range
Atmospheric environment (1994), Vol.246, p118113
01 Feb 2021
Featured in Collection : UN Sustainable Development Goals @ Drexel
Abstract
Recently, oil and natural gas (O&NG) production activities in the Denver-Julesburg Basin have expanded rapidly. Associated nonmethane hydrocarbon (NMHC) emissions contribute to photochemical formation of ground-level ozone and include benzene as well as other hazardous air pollutants. Using positive matrix factorization (PMF) and chemical mass balance (CMB) methods, we estimate how much O&NG activities and other sources contribute to morning NMHC mixing ratios measured from 2013 to mid-2016 at a site in Platteville, CO, in the Denver-Julesburg Basin, and at a contrasting site in downtown Denver. A novel adjoint sensitivity analysis method is then used to estimate corresponding contributions to ozone and ozone-linked mortality in the Denver region. Average 6-9 am NMHC mixing ratios in Platteville were seven times higher than those in Denver in 2013 but four times higher in 2016. CMB estimates that O&NG activities contributed to the Platteville (Denver) site an average of 96% (56%) of NMHC on a carbon basis while PMF indicated 92% (33%). Average vehicle-related contributions of NMHC are estimated as 41% by CMB and 53% by PMF in Denver. Estimates of the fractional contribution to potential ozone and ozone-linked mortality from O&NG activities are smaller while those from vehicles are larger than the NMHC contributions. CMB (PMF) indicate that greater than 78% (40%) of annual average benzene in Denver is attributable to vehicle emissions while greater than 75% (67%) of benzene in Platteville is attributable to O&NG activities.
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Details
- Title
- Evaluating oil and gas contributions to ambient nonmethane hydrocarbon mixing ratios and ozone-related metrics in the Colorado Front Range
- Creators
- Congmeng Lyu - Drexel UniversityShannon L. Capps - Drexel UniversityKent Kurashima - University of Colorado BoulderDaven K. Henze - University of Colorado BoulderGordon Pierce - Colorado Department of Public Health and EnvironmentAmir Hakami - Carleton UniversityShunliu Zhao - Carleton UniversityJaroslav Resler - Czech Academy of SciencesGregory R. Carmichael - University of IowaAdrian Sandu - Virginia TechArmistead G. Russell - Georgia Institute of TechnologyTianfeng Chai - NOAA Air Resources Laboratory; Cooperative Institute for Satellite Earth System Studies (CISESS), University of Maryland, College Park, MD, 20742, USAJana Milford - University of Colorado Boulder
- Publication Details
- Atmospheric environment (1994), Vol.246, p118113
- Publisher
- Elsevier
- Number of pages
- 17
- Grant note
- CBET-1240584 / AirWaterGas Sustainability Research Network - National Science Foundation
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Civil, Architectural, and Environmental Engineering
- Identifiers
- 991019167724504721
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- Collaboration types
- Domestic collaboration
- International collaboration
- Web of Science research areas
- Environmental Sciences
- Meteorology & Atmospheric Sciences