The complexity of the situation is compounded further by. View secondary organic aerosol formation research papers on academia. Aqueous chemistry and its role in secondary organic. Secondary organic aerosol soa, particulate matter composed of compounds formed from the atmospheric transformation of organic species, accounts for a substantial fraction of tropospheric aerosol. Atmospheric chemical mechanism for production of molecular constituents robert j. Aerosol size distributions and pah decay were monitored by a scanning mobility particle sizer and a gas.
Quantifying the effect of organic aerosol aging and. The formation of lowvolatility semivolatile and possibly nonvolatile compounds that make up soa is governed by a complex series of. The predicted secondary organic aerosol on 28 august 1987 represents 1522% of the measured particulate organic carbon at inland locations in the base case simulations, and 58% of that at coastal locations. Secondary organic aerosol formation research papers. Pdf relationship between oxidation level and optical. Global modeling of secondary organic aerosol with organic.
Gasoline and dieselpowered motor vehicles, both onoffroad, are important sources of soa precursors. Secondary organic aerosol soa is formed from the atmospheric oxidation of gasphase organic compounds leading to the formation of particle mass. The formation, properties and impact of secondary organic. It is estimated that 0 to 00 different organic compounds have been measured in the atmosphere goldstein and galbally, 2007. Pdf secondary organic aerosol formation and primary. In clouds and wet aerosols, watersoluble organic products of gasphase photochemistry dissolve into the aqueous phase where they can react further e. Griffin1 department of chemical engineering, california institute of. Aromatic hydrocarbons ahs that mainly emitted from coal combustion, transportation, solvent use and biofuelbiomass burning, are a major class of anthropogenic soa precursors.
Tiny remnants of combustion, known as black carbon, absorb solar radiation and warm the atmospherean effect that can be doubled by lensing from secondary organic aerosols. Human activities release large amounts of anthropogenic pollutants into the air, and thereby produce substantial secondary organic aerosol soa. Secondary organic aerosol formation and primary organic aerosol oxidation from biomassburning smoke in a flow reactor during flame3. Significant increase of aromaticsderived secondary. Abstract organic nucleation has been identified as an important way to form secondary organic aerosol soa and change the number concentration of aerosol and thus its. Secondary organic aerosol soa is one of the least understood constituents of fine particles. Ng et al secondary organic aerosol formation from aromatics tolocka et al. Additions include several recently identified soa precursors. A maximum secondary organic aerosol concentration of 6. Surface characterization of secondary organic aerosols. Secondary organic aerosol formation from mxylene, toluene. Evidence of major secondary organic aerosol contribution. Numerous scientific upgrades to the representation of secondary organic aerosol soa are incorporated into the community multiscale air quality cmaq modeling system.