U.S. Department of Energy Office of Biological and Environmental Research

BER Research Highlights

Regional Influence of Aerosol Emissions from Wildfires
Published: July 11, 2016
Posted: November 10, 2016

New metric developed for describing aerosol properties of wildfires and simulating their impact on climate and air quality.

The Science
Researchers found a useful metric for describing aerosol properties of wildfire emissions and their impacts on regional air quality and climate over the Pacific Northwest. Using real-time measurements from a fixed ground site, researchers found that the enhancement ratios (ERs) describing regional biomass burning organic aerosol concentrations, as well as their chemical compositions, were influenced by a mass combustion efficiency (MCE) at the time of emission impacting the aerosol’s oxidation state.

The Impact
Wildfires are a large and variable component of biomass burning emissions, such as agricultural and residential wood burning, that influence Earth’s climate. They contribute to atmospheric aerosol concentrations and affect regional air quality, global climate, and human health. Better understanding of the components, properties, and impacts of wildfire emissions are needed to include them in global climate models and may provide insights for mitigating their climate and air quality impacts.

In this study, researchers at the Department of Energy’s Pacific Northwest National Laboratory and collaborators studied the regional and nearfield influences of wildfire emissions on ambient aerosol concentration and chemical properties in the Pacific Northwest region of the United States. They used real-time measurements from a fixed ground site and an instrument-loaded aircraft in Central Oregon at the Mount Bachelor Observatory. They found that the regional characteristics of biomass burning aerosols depended strongly on the modified combustion efficiency (MCE), an index of a fire’s combustion processes. Organic aerosol emissions had negative correlations with MCE, whereas the oxidation state of organic aerosol increased with MCE and plume aging. The relationships between the aerosol properties and MCE were consistent between fresh emissions (∼1 h old) and emissions sampled after atmospheric transport (6-45 h), suggesting that biomass burning organic aerosol concentration and chemical properties were strongly influenced by combustion processes at the source and conserved to a significant extent during regional transport. These results suggest that MCE can be a useful metric for describing aerosol properties of wildfire emissions and their impacts on regional air quality and global climate.

Contacts (BER PM)
Ashley Williamson and Shaima Nasiri
Atmospheric System Research Program
Ashley.Williamson@science.doe.gov; Shaima.Nasiri@science.doe.gov  

Sally McFarlane
Atmospheric Radiation Measurement Climate Research Facility
(PI Contact)
Jerome Fast
Pacific Northwest National Laboratory

The work was funded by the U.S. Department of Energy (DOE), Office of Science, Office of Biological and Environmental Research as part of the Atmospheric Radiation Measurement (ARM) and Atmospheric System Research programs. They used data from the ARM Climate Research Facility, a DOE Office of Science user facility. Other researchers were funded by the National Science Foundation.

Collier, S., S. Zhou, T. B. Onasch, D. A. Jaffe, L. Kleinman, A. J. Sedlacek, III, N. L. Briggs, J. Hee, E. Fortner, J. E. Shilling, D. Worsnop, R. J. Yokelson, C. Parworth, X. Ge, J. Xu, Z. Butterfield, D. Chand, M. K. Dubey, M. S. Pekour, S. Springston, and Q. Zhang. 2016. “Regional Influence of Aerosol Emissions from Wildfires Driven by Combustion Efficiency: Insights from the BBOP Campaign,” Environmental Science and Technology 50(16), 8613-22. DOI: 10.1021/acs.est.6b01617. (Reference link)

Topic Areas:

  • Research Area: Earth and Environmental Systems Modeling
  • Research Area: Atmospheric System Research
  • Facility: DOE ARM User Facility

Division: SC-23.1 Climate and Environmental Sciences Division, BER


BER supports basic research and scientific user facilities to advance DOE missions in energy and environment. More about BER

Recent Highlights

May 10, 2019
Quantifying Decision Uncertainty in Water Management via a Coupled Agent-Based Model
Considering risk perception can improve the representation of human decision-making processes in age [more...]

May 09, 2019
Projecting Global Urban Area Growth Through 2100 Based on Historical Time Series Data and Future Scenarios
Study provides country-specific urban area growth models and the first dataset on country-level urba [more...]

May 05, 2019
Calibrating Building Energy Demand Models to Refine Long-Term Energy Planning
A new, flexible calibration approach improved model accuracy in capturing year-to-year changes in bu [more...]

May 03, 2019
Calibration and Uncertainty Analysis of Demeter for Better Downscaling of Global Land Use and Land Cover Projections
Researchers improved the Demeter model’s performance by calibrating key parameters and establi [more...]

Apr 22, 2019
Representation of U.S. Warm Temperature Extremes in Global Climate Model Ensembles
Representation of warm temperature events varies considerably among global climate models, which has [more...]

List all highlights (possible long download time)