Hourly In Situ Quantitation of Organic Aerosol Marker Compounds during CalNex 2010.

摘要

This study was conducted in Bakersfield, CA to investigate the emissions sources and chemistry controlling aerosol production in the southern San Joaquin Valley Air Basin (SJVAB) a region that is current ly out of compliance with ambient air quality standards for ozone and particulate matter. The primary objective was to invest igate the contributions of various sources to organic aerosol (OA) and the formation pathways of secondary organic aerosol (SOA) and subsequently provide insights into effective control strategies to reduce air pollution. An in-situ thermal desorption aerosol gas chromatography-mass spectrometry (TAG) instrument, equipped with a pm2.5 sharp-cut cyclone, was deployed to measure organic species in both gas and particle phases during the California at the Nexus of Air Quality and Climate Change (CalNex) measurement campaign from May 31st through June 27th, 2010. More than 100 compounds were quantified, including alkanes, polycyclic aromatic hydrocarbons (PAHs), branched PAHs, acids, furanones, and oxygenated compounds, which provided a large set of organic species for the investigation of SOA format ion through comparison between modeled and measured gas/part icle partitioning of Known SOA tracers and OA source apportionment through positive matrix factorization (PMF) analysis.