View secondary organic aerosol formation research papers on academia. Secondary organic aerosol formation research papers. Modeling the formation and evolution of secondary organic. Secondary organic aerosol soa formation from the photooxidation of five polycyclic aromatic hydrocarbons pahs, naphthalene, 1 and 2methylnaphthalene, acenaphthylene, and acenaphthene was investigated in a 9m3 chamber in the presence of nitrogen oxides and the absence of seed aerosols.
There is a growing understanding that secondary organic aerosol soa can form through reactions in atmospheric waters i. 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. They emit complex mixtures of gasphase organic compounds that vary in volatility and molecular structurefactors that influence their. Model representation of secondary organic aerosol in. 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. Atmospheric chemical mechanism for production of molecular constituents robert j. Aqueous chemistry and its role in secondary organic. It is estimated that 0 to 00 different organic compounds have been measured in the atmosphere goldstein and galbally, 2007. Aromatic hydrocarbons ahs that mainly emitted from coal combustion, transportation, solvent use and biofuelbiomass burning, are a major class of anthropogenic soa precursors. 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 from mxylene, toluene. Evidence of major secondary organic aerosol contribution. Surface characterization of secondary organic aerosols.
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. Global modeling of secondary organic aerosol with organic. Numerous scientific upgrades to the representation of secondary organic aerosol soa are incorporated into the community multiscale air quality cmaq modeling system. Pdf secondary organic aerosol formation and primary.
Gasoline and dieselpowered motor vehicles, both onoffroad, are important sources of soa precursors. Aerosol size distributions and pah decay were monitored by a scanning mobility particle sizer and a gas. Significant increase of aromaticsderived secondary. Pdf relationship between oxidation level and optical. In clouds and wet aerosols, watersoluble organic products of gasphase photochemistry dissolve into the aqueous phase where they can react further e. Human activities release large amounts of anthropogenic pollutants into the air, and thereby produce substantial secondary organic aerosol soa. The formation, properties and impact of secondary organic. A maximum secondary organic aerosol concentration of 6. At present, there are few field studies focusing on ahderived soa soaa. Secondary organic aerosol formation and primary organic aerosol oxidation from biomassburning smoke in a flow reactor during flame3.
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