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

Park, Kihong und Chow, Judith C. und Watson, John G. und Trimble, Dana L. und Doraiswamy, Prakash und Arnott, W. Pat und Stroud, Kenneth R. und Bowers, Kenneth und Bode, Richard und Petzold, Andreas und 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, Seiten 474-491.

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Kurzfassung

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.

Dokumentart:Zeitschriftenbeitrag
Titel:Comparison of Continuous and Filter-Based Carbon Measurements at the Fresno Supersite
Autoren:
AutorenInstitution oder E-Mail-Adresse der Autoren
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, AndreasNICHT SPEZIFIZIERT
Hansen, Anthony D.A.Lawrence Berkeley National Lab., Berkeley, CA, USA
Datum:2006
Erschienen in:Journal of the Air & Waste Management Association
Referierte Publikation:Ja
In SCOPUS:Ja
In ISI Web of Science:Ja
Band:56
Seitenbereich:Seiten 474-491
Status:veröffentlicht
Stichwörter:black carbon, air quality monitoring, MAAP, soot, aerosol, fine dust
HGF - Forschungsbereich:Luftfahrt, Raumfahrt und Verkehr
HGF - Programm:Verkehr
HGF - Programmthema:V UR - Schonung von Umwelt und Ressourcen (alt)
DLR - Schwerpunkt:Verkehr
DLR - Forschungsgebiet:V UR - Schonung von Umwelt und Ressourcen
DLR - Teilgebiet (Projekt, Vorhaben):V - Umweltwirkungen des Verkehrs (alt)
Standort: Oberpfaffenhofen
Institute & Einrichtungen:Institut für Physik der Atmosphäre > Atmosphärische Spurenstoffe
Hinterlegt von: Dr.rer.nat. Andreas Petzold
Hinterlegt am:07 Sep 2007
Letzte Änderung:11 Nov 2014 21:56

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