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

H. A. Gray, G. R. Cass, James Huntzicker

Research output: Contribution to journalArticle

361 Citations (Scopus)

Abstract

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.

Original languageEnglish (US)
Pages (from-to)580-589
Number of pages10
JournalEnvironmental Science and Technology
Volume20
Issue number6
StatePublished - Jun 1986

Fingerprint

Carbon
carbon
Aerosols
Air
air
particle
aerosol
aerosol formation
Monitoring
carbon emission
air mass
Particles (particulate matter)
summer
monitoring
basin

ASJC Scopus subject areas

  • Environmental Science(all)
  • Environmental Chemistry
  • Environmental Engineering
  • Earth and Planetary Sciences(all)

Cite this

Characteristics of atmospheric organic and elemental carbon particle concentrations in Los Angeles. / Gray, H. A.; Cass, G. R.; Huntzicker, James.

In: Environmental Science and Technology, Vol. 20, No. 6, 06.1986, p. 580-589.

Research output: Contribution to journalArticle

@article{ec4b2ca729464372b1f7cfd9eb1e2d59,
title = "Characteristics of atmospheric organic and elemental carbon particle concentrations in Los Angeles",
abstract = "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.",
author = "Gray, {H. A.} and Cass, {G. R.} and James Huntzicker",
year = "1986",
month = "6",
language = "English (US)",
volume = "20",
pages = "580--589",
journal = "Environmental Science & Technology",
issn = "0013-936X",
publisher = "American Chemical Society",
number = "6",

}

TY - JOUR

T1 - Characteristics of atmospheric organic and elemental carbon particle concentrations in Los Angeles

AU - Gray, H. A.

AU - Cass, G. R.

AU - Huntzicker, James

PY - 1986/6

Y1 - 1986/6

N2 - 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.

AB - 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.

UR - http://www.scopus.com/inward/record.url?scp=0022732337&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0022732337&partnerID=8YFLogxK

M3 - Article

AN - SCOPUS:0022732337

VL - 20

SP - 580

EP - 589

JO - Environmental Science & Technology

JF - Environmental Science & Technology

SN - 0013-936X

IS - 6

ER -