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Comparison of Continuous and Filter-Based Carbon Measurements at the Fresno Supersite

Park, Kihong and Chow, Judith C. and Watson, John G. and Trimble, Dana L. and Doraiswamy, Prakash and Arnott, W. Pat and Stroud, Kenneth R. and Bowers, Kenneth and Bode, Richard and Petzold, Andreas and Hansen, Anthony D.A. (2006) Comparison of Continuous and Filter-Based Carbon Measurements at the Fresno Supersite. Journal of the Air & Waste Management Association, 56, pp. 474-491.

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Abstract

Results from six continuous and semicontinuous black carbon (BC) and elemental carbon (EC) measurement methods are compared for ambient samples collected from December 2003 through November 2004 at the Fresno Supersite in California. Instruments included a multi-angle absorption photometer (MAAP; wavelength 670 nm); a dual-wavelength (wavelengths 370 and 880 nm) aethalometer; seven-color (wavelengths 370, 470, 520, 590, 660, 880, and 950 nm) aethalometers; the Sunset Laboratory carbon aerosol analysis field instrument; a photoacoustic light absorption analyzer (wavelength 1047 nm); and the R&P 5400 ambient carbon particulate monitor. All of these acquired BC or EC measurements over periods of 1 min to 1 hr. Twenty-fourhour integrated filter samples were also acquired and analyzed by the Interagency Monitoring of Protected Visual Environments (IMPROVE) thermal/optical reflectance carbon analysis protocol. Site-specific mass absorption efficiencies estimated by comparing light absorption with IMPROVE EC concentrations were 5.5m2/g for the MAAP, 10 m2/g for the aethalometer at a wavelength of 880 nm, and 2.3 m2/g for the photoacoustic analyzer; these differed from the default efficiencies of 6.5, 16.6, and 5m2/g, respectively. Scaling absorption by inverse wavelength did not provide equivalent light absorption coefficients among the instruments for the Fresno aerosol measurements. Ratios of light absorption at 370 nm to those at 880 nm from the aethalometer were nearly twice as high in winter as in summer. This is consistent with wintertime contributions from vehicle exhaust and from residential wood combustion, which is believed to absorb more shorter-wavelength light. To reconcile BC and EC measurements obtained by different methods, a better understanding is needed of the wavelength dependence of light-absorption and mass-absorption efficiencies and how they vary with different aerosol composition.

Document Type:Article
Title:Comparison of Continuous and Filter-Based Carbon Measurements at the Fresno Supersite
Authors:
AuthorsInstitution or Email of Authors
Park, KihongDesert Research Inst., Reno, NV, USA
Chow, Judith C.Desert Research Inst., Reno, NV, USA
Watson, John G.Desert Research Inst., Reno, NV, USA
Trimble, Dana L.Desert Research Inst., Reno, NV, USA
Doraiswamy, PrakashDesert Research Inst., Reno, NV, USA
Arnott, W. PatUniv. of Nevada, Reno, NV, USA
Stroud, Kenneth R.California Air Resources Board, Sacramento, CA, USA
Bowers, KennethCalifornia Air Resources Board, Sacramento, CA, USA
Bode, RichardCalifornia Air Resources Board, Sacramento, CA, USA
Petzold, AndreasUNSPECIFIED
Hansen, Anthony D.A.Lawrence Berkeley National Lab., Berkeley, CA, USA
Date:2006
Journal or Publication Title:Journal of the Air & Waste Management Association
Refereed publication:Yes
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:56
Page Range:pp. 474-491
Status:Published
Keywords:black carbon, air quality monitoring, MAAP, soot, aerosol, fine dust
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Transport
HGF - Program Themes:V UR - Schonung von Umwelt und Ressourcen (old)
DLR - Research area:Transport
DLR - Program:V UR - Schonung von Umwelt und Ressourcen
DLR - Research theme (Project):V - Umweltwirkungen des Verkehrs (old)
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Atmospheric Physics > Atmospheric Trace Species
Deposited By: Dr.rer.nat. Andreas Petzold
Deposited On:07 Sep 2007
Last Modified:11 Nov 2014 21:56

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