06 Apr 2020
06 Apr 2020
Dilution impacts on smoke aging: Evidence in BBOP data
- 1Department of Atmospheric Science, Colorado State University, Fort Collins, CO80523, United States
- 2Department of Mechanical Engineering, Colorado State University, Fort Collins, CO80523, United States
- 3Atmospheric and Environmental Research, Inc., Lexington, MA02421, United States
- 4Department of Chemistry, Colorado State University, Fort Collins, CO80523, United States
- 5Aerodyne Research Inc., Billerica, MA01821, United States
- 6Environmental and Climate Sciences Department, Brookhaven National Laboratory, Upton, NY11973, United States
- 7Center for Aerosol Science and Engineering, Washington University, St. Louis, MO63130, United States
- anow at: Center for Aerosol Science and Engineering, Washington University, St. Louis, MO 63130, United States
- bnow at: Department of Civil, Architectural and Environmental Engineering, Missouri University of Science and Technology, Rolla, Missouri 65409, United States
- 1Department of Atmospheric Science, Colorado State University, Fort Collins, CO80523, United States
- 2Department of Mechanical Engineering, Colorado State University, Fort Collins, CO80523, United States
- 3Atmospheric and Environmental Research, Inc., Lexington, MA02421, United States
- 4Department of Chemistry, Colorado State University, Fort Collins, CO80523, United States
- 5Aerodyne Research Inc., Billerica, MA01821, United States
- 6Environmental and Climate Sciences Department, Brookhaven National Laboratory, Upton, NY11973, United States
- 7Center for Aerosol Science and Engineering, Washington University, St. Louis, MO63130, United States
- anow at: Center for Aerosol Science and Engineering, Washington University, St. Louis, MO 63130, United States
- bnow at: Department of Civil, Architectural and Environmental Engineering, Missouri University of Science and Technology, Rolla, Missouri 65409, United States
Abstract. Biomass burning emits vapors and aerosols into the atmosphere that can rapidly evolve as smoke plumes travel downwind and dilute, affecting climate- and health-relevant properties of the smoke. To date, theory has been unable to explain variability in smoke evolution. Here, we use observational data from the BBOP field campaign and show that initial smoke concentrations can help predict changes in smoke aerosol aging markers, number, and diameter. Because initial field measurements of plumes are generally > 10 minutes downwind, smaller plumes will have already undergone substantial dilution relative to larger plumes. However, the extent to which dilution has occurred prior to the first observation is not a measurable quantity. Hence, initial observed concentrations can serve as an indicator of dilution, which impacts photochemistry and aerosol evaporation. Cores of plumes have higher concentrations than edges. By segregating the observed plumes into cores and edges, we infer that particle aging, evaporation, and coagulation occurred before the first measurement, and we find that edges generally undergo higher increases in oxidation tracers, more decreases in semivolatile compounds, and less coagulation than the cores.
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Anna L. Hodshire et al.
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RC1: 'Review of Hodshire et al.', Anonymous Referee #1, 16 Apr 2020
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RC2: 'Review of “Dilution impacts on smoke aging: Evidence in BBOP data” By Anna L. Hodshire et al.', Anonymous Referee #2, 19 Apr 2020
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RC3: 'Review (v2) of “Dilution impacts on smoke aging: Evidence in BBOP data” By Anna L. Hodshire et al.', Anonymous Referee #2, 01 May 2020
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RC3: 'Review (v2) of “Dilution impacts on smoke aging: Evidence in BBOP data” By Anna L. Hodshire et al.', Anonymous Referee #2, 01 May 2020
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AC1: 'Responses to Reviewers 1 and 2 (Hodshire et al., 2020)', Anna Hodshire, 13 Jul 2020
Anna L. Hodshire et al.
Anna L. Hodshire et al.
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