elib
DLR-Header
DLR-Logo -> http://www.dlr.de
DLR Portal Home | Imprint | Privacy Policy | Contact | Deutsch
Fontsize: [-] Text [+]

Evaluation of Multiangle Absorption Photometry for Measuring Aerosol Light Absorption

Petzold, A. and Schloesser, H. and Sheridan, P.J. and Arnott, W.P. and Ogren, J.A. and Virkkula, A. (2005) Evaluation of Multiangle Absorption Photometry for Measuring Aerosol Light Absorption. Aerosol Science and Technology, 39, pp. 40-51. Taylor & Francis. doi: 10.1080/027868290901945.

[img]
Preview
PDF
1MB

Abstract

A new multiangle absorption photometer for the measurement of aerosol light absorption was recently introduced that builds on the simultaneous measurement of radiation transmitted through and scattered back from a particle-loaded fiber filter at multiple detection angles. The absorption coefficient of the filter-deposited aerosol is calculated from the optical properties of the entire filter system, which are determined by a two-stream-approximation radiative transfer scheme. In the course of the Reno Aerosol Optics Study (RAOS), the response characteristics of multiangle absorption photometry (MAAP) for white aerosol, pure black carbon aerosol from different sources, external mixtures of black and white aerosol, and ambient aerosol was investigated. The MAAP response characteristics were compared to basic filter transmittance and filter reflectance measurements. MAAP showed close agreement with a reference absorption measurement by extinction minus scattering. The slopes of regression lines vary between 0.99±0.01 and 1.07±0.02 for pure black carbon particles and external mixtures with ammonium sulphate to 1.03±0.05 for ambient aerosol. No effect of the filter aerosol loading or the single-scattering albedoω0of the sampled aerosol on the MAAP response characteristics was observed. In contrast, transmittance and reflectance methods showed a clear impact ofω0and the filter loading on the response characteristics, which requires the application of a correction function for the reliable determination of the aerosol absorption coefficient. In the case of nonabsorbing aerosol, the MAAP approach reduced the magnitude of the apparently measured absorption coefficient by one order of magnitude compared to a basic transmittance measurement.

Item URL in elib:https://elib.dlr.de/18947/
Document Type:Article
Title:Evaluation of Multiangle Absorption Photometry for Measuring Aerosol Light Absorption
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Petzold, A.UNSPECIFIEDUNSPECIFIED
Schloesser, H.ESM Andersen Instruments, ErlangenUNSPECIFIED
Sheridan, P.J.NOAA, Boulder, CO, USAUNSPECIFIED
Arnott, W.P.Reno, NV, USAUNSPECIFIED
Ogren, J.A.NOAA, Boulder, CO, USAUNSPECIFIED
Virkkula, A.Finnish Meteorological Inst., Helsinki, FUNSPECIFIED
Date:2005
Journal or Publication Title:Aerosol Science and Technology
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:39
DOI :10.1080/027868290901945
Page Range:pp. 40-51
Publisher:Taylor & Francis
Status:Published
Keywords:aerosol absorption, air quality, black carbon
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Space (old)
HGF - Program Themes:W EO - Erdbeobachtung
DLR - Research area:Space
DLR - Program:W EO - Erdbeobachtung
DLR - Research theme (Project):W - Vorhaben Flugzeug-SAR (old)
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Atmospheric Physics
Deposited By: Löb, Ute
Deposited On:18 Mar 2008
Last Modified:31 Jul 2019 19:15

Repository Staff Only: item control page

Browse
Search
Help & Contact
Information
electronic library is running on EPrints 3.3.12
Copyright © 2008-2017 German Aerospace Center (DLR). All rights reserved.