Sources of carbonaceous aerosols over the United States and implications for natural visibility

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Sources of carbonaceous aerosols over the United States and implications for natural visibility (2003)

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by Rokjin J. Park , Daniel J. Jacob , Mian Chin , Randall V. Martin

Venue:	J. GEOPHYS. RES
Citations:	104 - 26 self

BibTeX

@ARTICLE{Park03sourcesof,
    author = {Rokjin J. Park and Daniel J. Jacob and Mian Chin and Randall V. Martin},
    title = {Sources of carbonaceous aerosols over the United States and implications for natural visibility},
    journal = {J. GEOPHYS. RES},
    year = {2003},
    volume = {108},
    pages = {2002--3190}
}

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Abstract

We use a global three-dimensional model (GEOS-CHEM) to better quantify the sources of elemental carbon (EC) and organic carbon (OC) aerosols in the United States through simulation of year-round observations for 1998 at a network of 45 sites (Interagency Monitoring of Protected Visual Environments (IMPROVE)). Simulation with our best a priori understanding of sources, including global satellite data to constrain fire emissions, captures most of the variance in the observations (R 2 = 0.84 for EC, 0.67 for OC) with a low bias of 15 % for EC and 26 % for OC. Multiple linear regression to fit the IMPROVE data yields best estimates of 1998 U.S. sources of 0.60 Tg year 1 EC and 0.52 Tg year 1 OC from fossil fuel; 0.07 Tg year 1 EC and 0.89 Tg year 1 OC from biofuel; 0.08 Tg year 1 EC and 0.60 Tg year 1 OC from wildfires; and 1.10 Tg year 1 OC from vegetation. We find that fires in Mexico and Canada contributed 40–70 % of annual mean natural EC in the United States for 1998 and 20–30% of annual mean natural OC. Transpacific transport from Asian pollution sources amounted to less than 10 % of the natural EC and less than 2 % of the natural OC; in contrast to ozone, we find that intercontinental transport of anthropogenic carbonaceous aerosols does

Keyphrases

tg year united state natural visibility carbonaceous aerosol organic carbon annual mean natural oc annual mean natural ec fire emission anthropogenic carbonaceous aerosol global satellite data multiple linear regression low bias natural oc improve data yield u.s. source elemental carbon fossil fuel interagency monitoring year-round observation global three-dimensional model asian pollution source protected visual environment transpacific transport intercontinental transport priori understanding natural ec

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