Abstract

Worldwide heavy oil and bitumen deposits amount to 9 trillion barrels of oil distributed in over 280 basins around the world1, with Canada home to oil sands deposits of 1.7 trillion barrels2. The global development of this resource and the increase in oil production from oil sands has caused environmental concerns over the presence of toxic compounds in nearby ecosystems3,4 and acid deposition5,6. The contribution of oil sands exploration to secondary organic aerosol formation, an important component of atmospheric particulate matter that affects air quality and climate7, remains poorly understood. Here we use data from airborne measurements over the Canadian oil sands, laboratory experiments and a box-model study to provide a quantitative assessment of the magnitude of secondary organic aerosol production from oil sands emissions. We find that the evaporation and atmospheric oxidation of low-volatility organic vapours from the mined oil sands material is directly responsible for the majority of the observed secondary organic aerosol mass. The resultant production rates of 45–84 tonnes per day make the oil sands one of the largest sources of anthropogenic secondary organic aerosols in North America. Heavy oil and bitumen account for over ten per cent of global oil production today8, and this figure continues to grow9. Our findings suggest that the production of the more viscous crude oils could be a large source of secondary organic aerosols in many production and refining regions worldwide, and that such production should be considered when assessing the environmental impacts of current and planned bitumen and heavy oil extraction projects globally.

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References

  1. 1.

    , & Heavy Oil and Natural Bitumen Resources in Geological Basins of the World (US Geological Survey, 2007)

  2. 2.

    Government of Alberta. Environmental Management of Alberta’s Oil Sands (Government of Alberta, 2009)

  3. 3.

    et al. Oil sands development contributes polycyclic aromatic compounds to the Athabasca River and its tributaries. Proc. Natl Acad. Sci. USA 106, 22346–22351 (2009)

  4. 4.

    et al. Atmospheric deposition of mercury and methylmercury to landscapes and waterbodies of the Athabasca oil sands region. Environ. Sci. Technol. 48, 7374–7383 (2014)

  5. 5.

    , , & Critical loads and H+ budgets of forest soils affected by air pollution from oil sands mining in Alberta, Canada. Atmos. Environ. 69, 56–64 (2013)

  6. 6.

    , & The importance of atmospheric base cation deposition for preventing soil acidification in the Athabasca Oil Sands Region of Canada. Sci. Total Environ. 493, 1–11 (2014)

  7. 7.

    et al. Particulate matter, air quality and climate: lessons learned and future needs. Atmos. Chem. Phys. 15, 8217–8299 (2015)

  8. 8.

    Oil vs. Light Oil: Legislative Brown Bag (BP, 2011)

  9. 9.

    Cold Heavy Oil Production with Sand in the Canadian Heavy Oil Industry Ch. 2 (Alberta Energy, 2002)

  10. 10.

    et al. Ubiquity and dominance of oxygenated species in organic aerosols in anthropogenically-influenced Northern Hemisphere midlatitudes. Geophys. Res. Lett. 34, L13801 (2007)

  11. 11.

    et al. Elucidating secondary organic aerosol from diesel and gasoline vehicles through detailed characterization of organic carbon emissions. Proc. Natl Acad. Sci. USA 109, 18318–18323 (2012)

  12. 12.

    et al. Intermediate-volatility organic compounds: a large source of secondary organic aerosol. Environ. Sci. Technol. 48, 13743–13750 (2014)

  13. 13.

    , & Atmospheric organic particulate matter: from smoke to secondary organic aerosol. Atmos. Environ. 43, 94–106 (2009)

  14. 14.

    et al. Characterization of trace gases measured over Alberta oil sands mining operations: 76 speciated C2–C10 volatile organic compounds (VOCs), CO2, CH4, CO, NO, NO2, NOy, O3 and SO2. Atmos. Chem. Phys. 10, 11931–11954 (2010)

  15. 15.

    et al. Organic aerosol formation downwind from the Deepwater Horizon oil spill. Science 331, 1295–1299 (2011)

  16. 16.

    et al. Laboratory studies on secondary organic aerosol formation from crude oil vapors. Environ. Sci. Technol. 47, 12566–12574 (2013)

  17. 17.

    Alberta Energy Regulator. Alberta Mineable Oil Sands Plant Statistics (Alberta Energy Regulator, 2013)

  18. 18.

    et al. Determining air pollutant emission rates based on mass balance using airborne measurement data over the Alberta oil sands operations. Atmos. Meas. Tech. 8, 3745–3765 (2015)

  19. 19.

    et al. The time evolution of aerosol composition over the Mexico City plateau. Atmos. Chem. Phys. 8, 1559–1575 (2008)

  20. 20.

    et al. Characterizing the impact of urban emissions on regional aerosol particles: Airborne measurements during the MEGAPOLI experiment. Atmos. Chem. Phys. 14, 1397–1412 (2014)

  21. 21.

    , & Photochemical evolution of submicron aerosol chemical composition in the Tokyo megacity region in summer. J. Geophys. Res. 113, D14304 (2008)

  22. 22.

    et al. Aircraft observations of aerosol composition and ageing in New England and Mid-Atlantic States during the summer 2002 New England Air Quality Study field campaign. J. Geophys. Res. 112, D09310 (2007)

  23. 23.

    & Organic aerosols in the Earth’s atmosphere. Environ. Sci. Technol. 43, 7614–7618 (2009)

  24. 24.

    et al. Modeling the formation and aging of secondary organic aerosols in Los Angeles during CalNex 2010. Atmos. Chem. Phys. 15, 5773–5801 (2015)

  25. 25.

    et al. Real-time methods for estimating organic component mass concentrations from aerosol mass spectrometer data. Environ. Sci. Technol. 45, 910–916 (2011)

  26. 26.

    et al. Evidence for a significant proportion of secondary organic aerosol from isoprene above a maritime tropical forest. Atmos. Chem. Phys. 11, 1039–1050 (2011)

  27. 27.

    , , & Reactive uptake of ammonia to secondary organic aerosols: kinetics of organonitrogen formation. Atmos. Chem. Phys. 15, 13569–13584 (2015)

  28. 28.

    et al. Emissions of organic carbon and methane from petroleum and dairy operations in California’s San Joaquin Valley. Atmos. Chem. Phys. 14, 4955–4978 (2014)

  29. 29.

    , , & Source signature of volatile organic compounds from oil and natural gas operations in northeastern Colorado. Environ. Sci. Technol. 47, 1297–1305 (2013)

  30. 30.

    et al. Field-deployable, high-resolution, time-of-flight aerosol mass spectrometer. Anal. Chem. 78, 8281–8289 (2006)

  31. 31.

    & Dependence of laser-induced incandescence on physical properties of black carbon aerosols: measurements and theoretical interpretation. Aerosol Sci. Technol. 44, 663–675 (2010)

  32. 32.

    et al. Single-particle measurements of midlatitude black carbon and light-scattering aerosols from the boundary layer to the lower stratosphere. J. Geophys. Res. 111, D16207 (2006)

  33. 33.

    & Measurements of volatile organic compounds in the earth’s atmosphere using proton-transfer-reaction mass spectrometry. Mass Spectrom. Rev. 26, 223–257 (2007)

  34. 34.

    The Atmospheric Boundary Layer (Cambridge Univ. Press, 1994)

  35. 35.

    & Turbulent dispersion of non-uniformly emitted passive tracers in the convective boundary layer. Boundary-Layer Meteorol. 133, 1–16 (2009)

  36. 36.

    Development of a condensed SAPRC-07 chemical mechanism. Atmos. Environ. 44, 5336–5345 (2010)

  37. 37.

    , , , & Assessment of SAPRC07 with updated isoprene chemistry against outdoor chamber experiments. Atmos. Environ. 105, 109–120 (2015)

  38. 38.

    et al. Understanding the impact of recent advances in isoprene photooxidation on simulations of regional air quality. Atmos. Chem. Phys. 13, 8439–8455 (2013)

  39. 39.

    et al. Sensitivity and specificity of atmospheric trace gas detection by proton-transfer-reaction mass spectrometry. Int. J. Mass Spectrom. 223–224, 365–382 (2003)

  40. 40.

    & Proton transfer reaction rate constants between hydronium ion (H3O+) and volatile organic compounds. Atmos. Environ. 38, 2177–2185 (2004)

  41. 41.

    et al. Seasonal variation of mono- and sesquiterpene emission rates of Scots pine. Biogeosciences 3, 93–101 (2006)

  42. 42.

    et al. Sesquiterpene emissions from pine trees—identifications, emission rates and flux estimates for the contiguous United States. Environ. Sci. Technol. 41, 1545–1553 (2007)

  43. 43.

    et al. A large source of low-volatility secondary organic aerosol. Nature 506, 476–479 (2014)

  44. 44.

    et al. Unspeciated organic emissions from combustion sources and their influence on the secondary organic aerosol budget in the United States. Proc. Natl Acad. Sci. USA 111, 10473–10478 (2014)

  45. 45.

    et al. Evaluation of the volatility basis-set approach for the simulation of organic aerosol formation in the Mexico City metropolitan area. Atmos. Chem. Phys. 10, 525–546 (2010)

  46. 46.

    et al. Rethinking organic aerosols: semivolatile emissions and photochemical aging. Science 315, 1259–1262 (2007)

  47. 47.

    , , & Laboratory investigation of photochemical oxidation of organic aerosol from wood fires 1: measurement and simulation of organic aerosol evolution. Atmos. Chem. Phys. 9, 1263–1277 (2009)

  48. 48.

    , , & Simulating the oxygen content of ambient organic aerosol with the 2D volatility basis set. Atmos. Chem. Phys. 11, 7859–7873 (2011)

  49. 49.

    , , , & Effects of gas particle partitioning and aging of primary emissions on urban and regional organic aerosol concentrations. J. Geophys. Res. 113, (2008)

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Acknowledgements

We thank the National Research Council of Canada flight crew of the Convair-580, the technical support staff of the Air Quality Research Division, S. Cober for the management of the study, and the community of Fort McKay for the support of the Oski ôtin ground site at Fort McKay. The project was supported by the Clean Air Regulatory Agenda and the Joint Oil Sands Monitoring program.

Author information

Affiliations

  1. Air Quality Research Division, Environment and Climate Change Canada, Toronto, Ontario M3H 5T4, Canada

    • John Liggio
    • , Shao-Meng Li
    • , Katherine Hayden
    • , Craig Stroud
    • , Andrea Darlington
    • , Mark Gordon
    • , Patrick Lee
    • , Peter Liu
    • , Amy Leithead
    • , Samar G. Moussa
    • , Danny Wang
    • , Jason O’Brien
    • , Richard L. Mittermeier
    • , Jeffrey R. Brook
    • , Gang Lu
    • , Ralf M. Staebler
    • , Yuemei Han
    • , Paul A. Makar
    •  & Junhua Zhang
  2. Department of Chemistry, University of Calgary, Calgary, Alberta T2N 1N4, Canada

    • Youssef M. Taha
    • , Travis W. Tokarek
    •  & Hans D. Osthoff
  3. Department of Chemical & Environmental Engineering, Yale University, New Haven, Connecticut 06520-8267, USA

    • Brian D. Drollette
    • , Desiree L. Plata
    •  & Drew R. Gentner

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Contributions

All authors contributed to the collection of observations in the field, in the laboratory or the development of the box model. J.L. and S.-M.L. wrote the paper with input from all co-authors. S.-M.L. designed and directed the flights. Y.M.T. and C.S. conducted the box modelling work with input from J.L. D.R.G., D.P., B.D.D. and P.L. provided bitumen volatility distributions.

Competing interests

The authors declare no competing financial interests.

Corresponding authors

Correspondence to John Liggio or Shao-Meng Li.

The data used are available on the Canada-Alberta Oil Sands Environmental Monitoring Information Portal (http://jointoilsandsmonitoring.ca/default.asp?n=5F73C7C9-1&lang=en).

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    Supplementary Information

    This file contains Supplementary Methods, Supplementary Discussion, Supplementary Tables 1-2 and Supplementary References.

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DOI

https://doi.org/10.1038/nature17646

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