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Characteristics of atmospheric organic and elemental carbon particle concentrations in Los Angeles

Gray, H. Andrew and Cass, Glen R. and Huntzicker, James J. and Heyerdahl, Emily K. and Rau, John A. (1986) Characteristics of atmospheric organic and elemental carbon particle concentrations in Los Angeles. Environmental Science and Technology, 20 (6). pp. 580-589. ISSN 0013-936X. doi:10.1021/es00148a006.

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A fine particle air monitoring network was operated in the Los Angeles area during 1982. It was found that carbonaceous aerosols accounted for typically 40% of total fine particle mass loadings at most monitoring sites. The ratio of total carbon (TC) to elemental carbon (EC) in ambient samples and in primary source emissions was examined as an indicator of the extent of secondary organic aerosol formation. It was found that TC to EC ratios at all sites on average are no higher than recent estimates of the TC to EC ratio in primary source emissions. There is little evidence of the sustained summer peak in the ratio of TC to EC that one might expect if greatly enhanced secondary organics production occurs during the photochemical smog season. The TC to EC ratio does rise by the time that air masses reach the prevailing downwind edge of the air basin as would be expected if secondary organics are being formed during air parcel transport, but the extent of that increase is modest. These results suggest that primary particulate carbon emissions were the principal contributor to long-term average fine aerosol carbon concentrations in the Los Angeles area during 1982.

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Additional Information:© 1986 American Chemical Society. Received for review June 8,1984. Accepted December 26,1985. This work was supported by the California Air Resources Board under Agreement A1-071-32. We thank Shohreh Gharib and Daniel Jacob for assistance with filter handling and chemical analysis at Caltech. We thank John Cooper and Cliff Frazier at NEA Labs for performing the trace metals analysis by XRF. Air-monitoring sites were provided through the cooperation of the South Coast Air Quality Management District, the California Air Resources Board, the U.S. Navy, and the Ventura County Air Pollution Control District.
Group:Environmental Quality Laboratory
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California Air Resources BoardA1-071-32
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Other Numbering System NameOther Numbering System ID
Environmental Quality LaboratoryA-190
Issue or Number:6
Record Number:CaltechAUTHORS:20140916-122126107
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Official Citation:Characteristics of atmospheric organic and elemental carbon particle concentrations in Los Angeles H. Andrew. Gray, Glen R. Cass, James J. Huntzicker, Emily K. Heyerdahl, and John A. Rau Environmental Science & Technology 1986 20 (6), 580-589
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:49745
Deposited By: Ruth Sustaita
Deposited On:16 Sep 2014 20:56
Last Modified:10 Nov 2021 18:47

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