Interactions between boreal wildfire and urban emissions

Keith J. Bein, Yongjing Zhao, Murray V. Johnston, Anthony S. Wexler

Research output: Contribution to journalArticle

30 Citations (Scopus)

Abstract

A suite of particulate, gaseous and meteorological measurements during the Pittsburgh Supersite experiment were used to characterize the impact of the 2002 Quebec wildfires on pollutant concentrations and physical and chemical processes dominant in the region. Temporal trends in the number distribution of wildfire particles (isolated using Rapid Single-ultrafine-particle Mass Spectrometry data) combined with CO, NOx and O3 mixing ratios identified two separate periods (Periods I and II) when the measurement site was directly impacted by plumes of relatively unprocessed wildfire emissions; i.e., increases in primary ultrafine wildfire particles, CO and NOx concomitant with a decrease in O3 from intraplume NOx titration. Carbonaceous particle number distributions predominantly associated with vehicular emissions, PM2.5 sulfate mass concentration and SO2 mixing ratio resolved individual components of local and regional sources. Single particle signatures indicated a period of intense atmospheric processing following Period II that caused rapid growth of the ultrafine mode due to simultaneous sulfate and secondary organic mass accumulation, resulting in significant changes to article physical and chemical properties. Particle growth was concurrent with large increases in O3 and maxima in incoming solar radiation and ambient temperature and is posited to have occurred in situ as the air mass, containing a mixture of urban and wildfire emissions, was advected past the site. In total, the current work demonstrates significant added severity for pollution episodes in an area already burdened by large anthropogenic emission rates due to the impact of the 2002 Quebec wildfires. High levels of atmospheric processing increased sulfate accumulation and SOA formation and brought PM2.5 mass concentrations close to, and O3 mixing ratios in excess of, the National Ambient Air Quality Standards. Projections of increasing wildfire activity under a warming climate may increase the frequency and severity of such events.

Original languageEnglish (US)
Article numberD07304
JournalJournal of Geophysical Research: Atmospheres
Volume113
Issue number7
DOIs
StatePublished - Apr 16 2008

Fingerprint

wildfires
wildfire
Sulfates
Carbon Monoxide
mixing ratios
Quebec
sulfates
Air quality standards
Vehicle Emissions
mixing ratio
interactions
Service oriented architecture (SOA)
Processing
Solar radiation
Titration
Chemical properties
Mass spectrometry
sulfate
Pollution
Physical properties

ASJC Scopus subject areas

  • Geochemistry and Petrology
  • Geophysics
  • Earth and Planetary Sciences (miscellaneous)
  • Space and Planetary Science
  • Atmospheric Science
  • Astronomy and Astrophysics
  • Oceanography

Cite this

Interactions between boreal wildfire and urban emissions. / Bein, Keith J.; Zhao, Yongjing; Johnston, Murray V.; Wexler, Anthony S.

In: Journal of Geophysical Research: Atmospheres, Vol. 113, No. 7, D07304, 16.04.2008.

Research output: Contribution to journalArticle

Bein, Keith J. ; Zhao, Yongjing ; Johnston, Murray V. ; Wexler, Anthony S. / Interactions between boreal wildfire and urban emissions. In: Journal of Geophysical Research: Atmospheres. 2008 ; Vol. 113, No. 7.
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