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Title: Ubiquitous influence of wildfire emissions and secondary organic aerosol on summertime atmospheric aerosol in the forested Great Lakes region

Abstract

Abstract. Long-range aerosol transport affects locations hundreds ofkilometers from the point of emission, leading to distant particle sourcesinfluencing rural environments that have few major local sources. Sourceapportionment was conducted using real-time aerosol chemistry measurementsmade in July 2014 at the forested University of Michigan Biological Stationnear Pellston, Michigan, a site representative of the remote forested GreatLakes region. Size-resolved chemical composition of individual0.5–2.0µm particles was measured using an aerosoltime-of-flight mass spectrometer (ATOFMS), and non-refractory aerosol massless than 1µm (PM 1) was measured with a high-resolutionaerosol mass spectrometer (HR-AMS). The field site was influenced by airmasses transporting Canadian wildfire emissions and urban pollution fromMilwaukee and Chicago. During wildfire-influenced periods,0.5–2.0µm particles were primarily aged biomass burningparticles (88% by number). These particles were heavily coated withsecondary organic aerosol (SOA) formed during transport, with organics(average O/C ratio of 0.8) contributing 89% of thePM 1 mass. During urban-influenced periods, organic carbon,elemental carbon–organic carbon, and aged biomass burning particles wereidentified, with inorganic secondary species (ammonium, sulfate, and nitrate)contributing 41% of the PM 1 mass, indicative of atmosphericprocessing. With current models underpredicting organic carbon in thisregion and biomass burning being the largest combustion contributor to SOA bymass, these results highlight the importance for regional chemical transportmodels to accurately predict the impact ofmore » long-range transported particleson air quality in the upper Midwest, United States, particularly consideringincreasing intensity and frequency of Canadian wildfires.« less

Authors:
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Publication Date:
Research Org.:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1502417
Report Number(s):
PNNL-SA-136284
Journal ID: ISSN 1680-7324
Grant/Contract Number:  
AC05-76RL01830
Resource Type:
Accepted Manuscript
Journal Name:
Atmospheric Chemistry and Physics (Online)
Additional Journal Information:
Journal Name: Atmospheric Chemistry and Physics (Online); Journal Volume: 18; Journal Issue: 5; Journal ID: ISSN 1680-7324
Publisher:
European Geosciences Union
Country of Publication:
United States
Language:
English

Citation Formats

Gunsch, Matthew J., May, Nathaniel W., Wen, Miao, Bottenus, Courtney L. H., Gardner, Daniel J., VanReken, Timothy M., Bertman, Steven B., Hopke, Philip K., Ault, Andrew P., and Pratt, Kerri A. Ubiquitous influence of wildfire emissions and secondary organic aerosol on summertime atmospheric aerosol in the forested Great Lakes region. United States: N. p., 2018. Web. doi:10.5194/acp-18-3701-2018.
Gunsch, Matthew J., May, Nathaniel W., Wen, Miao, Bottenus, Courtney L. H., Gardner, Daniel J., VanReken, Timothy M., Bertman, Steven B., Hopke, Philip K., Ault, Andrew P., & Pratt, Kerri A. Ubiquitous influence of wildfire emissions and secondary organic aerosol on summertime atmospheric aerosol in the forested Great Lakes region. United States. doi:10.5194/acp-18-3701-2018.
Gunsch, Matthew J., May, Nathaniel W., Wen, Miao, Bottenus, Courtney L. H., Gardner, Daniel J., VanReken, Timothy M., Bertman, Steven B., Hopke, Philip K., Ault, Andrew P., and Pratt, Kerri A. Mon . "Ubiquitous influence of wildfire emissions and secondary organic aerosol on summertime atmospheric aerosol in the forested Great Lakes region". United States. doi:10.5194/acp-18-3701-2018. https://www.osti.gov/servlets/purl/1502417.
@article{osti_1502417,
title = {Ubiquitous influence of wildfire emissions and secondary organic aerosol on summertime atmospheric aerosol in the forested Great Lakes region},
author = {Gunsch, Matthew J. and May, Nathaniel W. and Wen, Miao and Bottenus, Courtney L. H. and Gardner, Daniel J. and VanReken, Timothy M. and Bertman, Steven B. and Hopke, Philip K. and Ault, Andrew P. and Pratt, Kerri A.},
abstractNote = {Abstract. Long-range aerosol transport affects locations hundreds ofkilometers from the point of emission, leading to distant particle sourcesinfluencing rural environments that have few major local sources. Sourceapportionment was conducted using real-time aerosol chemistry measurementsmade in July 2014 at the forested University of Michigan Biological Stationnear Pellston, Michigan, a site representative of the remote forested GreatLakes region. Size-resolved chemical composition of individual0.5–2.0µm particles was measured using an aerosoltime-of-flight mass spectrometer (ATOFMS), and non-refractory aerosol massless than 1µm (PM1) was measured with a high-resolutionaerosol mass spectrometer (HR-AMS). The field site was influenced by airmasses transporting Canadian wildfire emissions and urban pollution fromMilwaukee and Chicago. During wildfire-influenced periods,0.5–2.0µm particles were primarily aged biomass burningparticles (88% by number). These particles were heavily coated withsecondary organic aerosol (SOA) formed during transport, with organics(average O/C ratio of 0.8) contributing 89% of thePM1 mass. During urban-influenced periods, organic carbon,elemental carbon–organic carbon, and aged biomass burning particles wereidentified, with inorganic secondary species (ammonium, sulfate, and nitrate)contributing 41% of the PM1 mass, indicative of atmosphericprocessing. With current models underpredicting organic carbon in thisregion and biomass burning being the largest combustion contributor to SOA bymass, these results highlight the importance for regional chemical transportmodels to accurately predict the impact of long-range transported particleson air quality in the upper Midwest, United States, particularly consideringincreasing intensity and frequency of Canadian wildfires.},
doi = {10.5194/acp-18-3701-2018},
journal = {Atmospheric Chemistry and Physics (Online)},
number = 5,
volume = 18,
place = {United States},
year = {2018},
month = {1}
}

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