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The Multi-Angle Absorption Photometer for the Determination of Black Carbon in Ambient Aerosol

The Multi-Angle Absorption Photometer for the Determination of Black Carbon in Ambient Aerosol CARUSSO A. Petzold  1 , M. Schönlinner  2 , H.Kramer  2 and H. Schloesser  2 1 Institut für Physik der Atmosphäre,

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The Multi-Angle Absorption Photometer for the Determination of Black Carbon in Ambient Aerosol

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  1. The Multi-Angle Absorption Photometer for the Determination of Black Carbon in Ambient Aerosol CARUSSO A. Petzold 1 , M. Schönlinner 2 , H.Kramer 2 and H. Schloesser 2 1 Institut für Physik der Atmosphäre,    Deutsches Zentrum für Luft- und Raumfahrt Oberpfaffenhofen, 82234 Wessling, Germany 2 ESM Andersen Instruments, Frauenauracher Str. 96, 91056 Erlangen, Germany Institut für Physik der Atmosphäre Atmosphärische Aerosole

  2. The Multi-Angle Absorption Photometer for the Determination of Black Carbon in Ambient Aerosol • Determination of the black carbon (BC) content in ambient aerosol by means of an extinction measurement on filter-deposited aerosol samples. • Measurement of transmitted and reflected radiation in angular-resolved mode. • Reduction of measurement uncertainties, which are related to multiple scattering of radiation by aerosol particles and between the aerosol layer and the filter substrate, by applying a radiative transfer scheme to the data analysis. Optical sensor head Institut für Physik der Atmosphäre Atmosphärische Aerosole

  3. Data Analysis Algorithm The aerosol is deposited in the top layer of a fiber filter matrix, which is termed as aerosol-filter layer. A two-stream approximation is applied to calculate the radiative properties of the aerosol-filter layer from the radiative transfer equation. Required input values are the measured filter transmittance transand reflectance ref. The algorithm determines optical thickness of the aerosol-filter layer  L single-scattering albedo of the aerosol-filter layer  0 Derived properties are aerosol-filter layer absorbance ABS = 100  L ( 1 -  0 ) BC mass loading of the filterABS =  ABSS BC Institut für Physik der Atmosphäre Atmosphärische Aerosole

  4. Instrument Capabilities The instrument is set up as a filter tape device. time resolution  2 min sampling volume 0.5 - 1 m 3 h -1 detection limit (1 m3 h -1, 2 min) 10 -6 m -1  100 ng m -3 Institut für Physik der Atmosphäre Atmosphärische Aerosole

  5. Design of the Multi Angle Absorption Photometer - CARUSSO Institut für Physik der Atmosphäre Atmosphärische Aerosole

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