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Measurement of Wavelength-Resolved Light Absorption by Aerosols Utilizing a UV-VIS Extinction Cell

Schnaiter, Martin and Schmid, Otmar and Petzold, Andreas and Fritzsche, Lutz and Klein, Karl-Friedrich and Andreae, Meinrat O. and Helas, Günther and Thielmann, Axel and Gimmler, Melanie and Möhler, Ottmar and Linke, Claudia and Schurath, Ulrich (2005) Measurement of Wavelength-Resolved Light Absorption by Aerosols Utilizing a UV-VIS Extinction Cell. Aerosol Science and Technology, 39, pp. 249-260. DOI: 10.1080/027868290925958.

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The principle, technical details, and performance of the long path extinction spectrometer (LOPES), a new folded-path extinction cell with a spectral range from the mid-UV (200 nm) to the near infrared (1015 nm), is presented. Using nonabsorbing glass beads the measured extinction spectrum of LOPES was validated by Mie calculations and was compared with scattering coefficients in the visible measured by a three-color integrating nephelometer (TSI, mod. 3563). For absorbing aerosols (here soot and biomass burning aerosol with single-scattering albedos of about 0.2 and 0.74 at 550 nm), LOPES was combined with a TSI 3563 nephelometer to determine the wavelength-dependent absorption coefficients from the difference of the extinction and scattering coefficients. These absorption coefficients were found to agree with the measurements by two state-of-the-art absorption techniques, the multiangle absorption photometry (MAAP) and photoacoustic spectrometry (PAS), which measure the absorption coefficient at the single wavelength of 532 nm and 670 nm, respectively. Finally, based on a comprehensive analysis of the TSI 3563 nephelometer errors and their propagation into the determination of the absorption coefficients from the LOPES and nephelometer data, we discuss implications for improving in situmeasurements of the optical properties of atmospheric aerosols.

Document Type:Article
Title:Measurement of Wavelength-Resolved Light Absorption by Aerosols Utilizing a UV-VIS Extinction Cell
AuthorsInstitution or Email of Authors
Schnaiter, MartinFZ Karlsruhe, Karlsruhe
Schmid, OtmarMPI for Chemistry, Mainz
Petzold, AndreasUNSPECIFIED
Fritzsche, LutzUNSPECIFIED
Klein, Karl-FriedrichFH Gießen-Friedberg, Friedberg
Andreae, Meinrat O.MPI for Chemistry, Mainz
Helas, GüntherMPI for Chemistry, Mainz
Thielmann, AxelMPI for Chemistry, Mainz
Gimmler, MelanieFZ Karlsruhe, Karlsruhe
Möhler, OttmarFZ Karlsruhe, Karlsruhe
Linke, ClaudiaFZ Karlsruhe, Karlsruhe
Schurath, UlrichFZ Karlsruhe, Karlsruhe
Date:March 2005
Journal or Publication Title:Aerosol Science and Technology
Refereed publication:Yes
In Open Access:No
In ISI Web of Science:Yes
Page Range:pp. 249-260
Keywords:aerosol measurement, aerosol absoprtion, absorption measurement, multi-angle absorption photometry, long-path extinction cell
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:17 Apr 2007
Last Modified:11 Nov 2014 21:56

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