2013 Uintah Basin Winter Ozone Study 1 uintahbasin/studies/UBOS-2013.htm John Horel and Erik Crosman Mountain Meteorology.

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Presentation transcript:

2013 Uintah Basin Winter Ozone Study 1 uintahbasin/studies/UBOS-2013.htm John Horel and Erik Crosman Mountain Meteorology Group Department of Atmospheric Sciences University of Utah

2013 Uintah Basin Winter Ozone Study 2 Researchers From: Utah State University National Oceanic and Atmospheric Administration Utah Department of Environmental Quality University of Utah University of Colorado, Boulder University of Wyoming University of California Los Angeles University of Washington See report for researchers’ contact info uintahbasin/studies/UBOS-2013.htm

2013 Uintah Basin Winter Ozone Study 3 Funding: Uintah Impact Mitigation Special Service District Western Energy Alliance Questar Energy Products Bureau of Land Management National Oceanic and Atmospheric Administration Environmental Protection Agency Utah Department of Environmental Quality Utah Science Technology and Research Initiative Utah School and Institutional Trust Lands Administration

2013 Uintah Basin Winter Ozone Study 4 Background Current EPA standard: 75 ppb First measured elevated ozone: 2009 First extensive study: 2011 Ongoing field campaigns: uintahbasin/studies/UBOS-2013.htm

2013 Uintah Basin Winter Ozone Study 5 Takeaway Points Oil and gas production is large and growing Production releases particulates and array of gases When snow on ground and stable atmosphere, ozone generated photo- chemically and trapped near ground Key unknowns: Emissions Role of ozone precursor gases, such as nitrous acid and formaldehyde uintahbasin/studies/UBOS-2013.htm

Simulation of a Cold-Air Pool and Winter Ozone Episode in Utah’s Uintah Basin E. Neemann, E. Crosman, J. Horel, L. Avey Atmospheric Chemistry and Physics To be submitted 1 Feb2 Feb6 Feb4 Feb3 Feb5 Feb 2014

Background - Ozone & Health 7 U.S. EPA: Surface ozone is a significant health hazard to humans -Respiratory irritation and inflammation -Aggravated asthma -Long-term lung damage -Increased hospital admissions and ER visits -Increased mortality

Winter Ozone Production 8  Z NO x Snow Cover VOCs O3O3 Oil and gas operations release ozone precursors: volatile organic compounds (VOCs) and nitrous oxides (NOx) Pollutants trapped near surface when stable conditions aloft Snow cover sustains cold air near surface High albedo snow reflects sunlight back to atmosphere enhancing photochemical reactions with ozone precursors Leads to elevated ozone levels trapped near the surface (Precursors)O + h O O + O2 O3

Increase in Oil and Gas Drilling in Utah

-9,400 oil & gas producing wells in March Over 3,600 permits for additional wells since Jan 2012 Uintah Basin 10 Courtesy of Utah Division of Oil, Gas, and Mining

Emissions (Barickman 2014) Emission inventories for the Basin remain incomplete Difficult to obtain emissions data due to diverse surface and mineral rights VOC emissions depend on well and equipment types Inventory data specific to winter ozone season needed as emissions from evaporation ponds and methanol uses have large seasonal variations

Volatile Organic Compound (VOCs) by Hydroxyl (OH) reactivity measured during UBOS 2013 Roberts et al. (2014 )

Duchesne River Green River White River Mobile Ozone Transect - 6 Feb High concentrations measured throughout the basin -Greatest values in lower elevations and river valleys NAAQS Vernal Roosevelt Ouray

Atmospheric Stability Aloft Traps Pollutants 14 Photos: Erik Crosman 1-6 Feb 2013: Backscatter and Estimated Aerosol Depth CLEAN AIR POLLUTED LAYER Elevation (m) Time -> Temp Dewpoint WARM FOG/LOW CLOUDS COLD

Karion et al. (2014) Figure Profiles of constituents measured on the aircraft on January 31 in the vicinity of the natural gas field and gas processing plants. Temp OZONE

Current EPA ozone standard violated if: 3-yr average of the annual calendar year 4 th highest daily max 8-hr average exceeds 75 ppb Ozone levels in Uintah Basin over past 5 winters:

Current EPA ozone standard violated if: 3-yr average of the annual calendar year 4 th highest daily max 8-hr average exceeds 75 ppb Ozone levels in Uintah Basin over past 5 winters: Above Below

SNOW: red NO SNOW: cyan CLOUDS: white Current EPA ozone standard violated if: 3-yr average of the annual calendar year 4 th highest daily max 8-hr average exceeds 75 ppb Ozone levels in Uintah Basin over past 5 winters: Which is largely controlled by extent of snow cover in basin: Wide Little 2 Feb Feb 2014 Above Below

Schnell et al. (2014)

Snow in the Uintah Basin It doesn’t snow often and, when it does, it usually doesn’t snow much Stable, stagnant conditions inhibit ablation (ice -> vapor) Fog/low clouds reflect water cycling: ice-> vapor -> cloud -> snow via deposition/riming Albedo can remain high due to metamorphism of snow pack over time Complex chemistry happening with ozone precursors in the snow pack 20 Photo: Erik Crosman

What If? Simulation of Mean Afternoon Ozone LST 1-6 February SNOWNO SNOW Height (km) Height (km) ppb -Ozone concentrations notably higher in numerical simulation with SNOW cover -From Neemann, Crosman, Horel, Avey (2014) Wasatch Green River Wasatch Green River

2013 Uintah Basin Winter Ozone Study 22 Takeaway Points Oil and gas production is large and growing Production releases particulates and array of gases When snow on ground and stable atmosphere, ozone generated photo- chemically and trapped near ground Key unknowns: Emissions Role of ozone precursor gases, such as nitrous acid and formaldehyde uintahbasin/studies/UBOS-2013.htm

2013 Uintah Basin Winter Ozone Study 23 Developing Control Strategies Episodic or seasonal controls may be appropriate for winter ozone concerns Emission reductions at Bonanza power plant are unlikely to have any effect on winter ozone episodes Reductions in all VOC emissions will be beneficial reductions in formaldehyde and aromatic VOC will be more beneficial on a per ton basis; however, less reactive VOCs dominate emissions and ozone production Personal opinion: business as usual is not an option… Uintah Basin Standard

Collaborations Involving UU State of Utah Energy Initiatives and Imperatives Program: – Computer Modeling of Winter Ozone Formation in the Uintah Basin – M. Mansfield (USU), J. Horel ( UU), S. Lyman (USU), J. Hansen (BYU) (1-year project) NOAA: – The Uintah Basin Greenhouse Gas Study: Understanding emissions of CO2 and CH4 from oil and gas fields – J. Lin, J. Horel, J. Ehleringer (3-year project)