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A new method to retrieve the aerosol layer absorption coefficient from airborne flux density and actinic radiation measurements

Bierwirth, Eike and Wendisch, Manfred and Jäkel, Evelyn and Ehrlich, André and Schmidt, K. Sebastian and Stark, Harald and Pilewskie, Peter and Esselborn, Michael and Gobbi, Gian Paolo and Ferrare, Richard and Müller, Thomas and Clarke, Antony (2010) A new method to retrieve the aerosol layer absorption coefficient from airborne flux density and actinic radiation measurements. Journal of Geophysical Research, 115 (D14211), pp. 1-11. DOI: 10.1029/2009JD013636.

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Official URL: http://www.agu.org/journals/jd/jd1011/2009JD012523/2009JD012523.pdf


A new method is presented to derive the mean value of the spectral absorption coefficient of an aerosol layer from combined airborne measurements of spectral net irradiance and actinic flux density. While the method is based on a theoretical relationship of radiative transfer theory, it is applied to atmospheric radiation measurements for the first time. The data have been collected with the Spectral Modular Airborne Radiation Measurement System (SMART‐Albedometer), the Solar Spectral Flux Radiometer (SSFR), and the Actinic Flux Spectroradiometer (AFSR) during four field campaigns between 2002 and 2008 (the Saharan Mineral Dust Experiment (SAMUM), the Influence of Clouds on the Spectral Actinic Flux in the Lower Troposphere (INSPECTRO) project, and the Arctic Research of the Composition of the Troposphere from Aircraft and Satellites and Aerosol, Radiation, and Cloud Processes Affecting Arctic Climate (ARCTAS/ARCPAC) projects). The retrieval algorithm is tested in a series of radiative transfer model runs and then applied to measurement cases with different aerosol species and loading. The method is shown to be a feasible approach to obtain the mean aerosol absorption coefficient across a given accessible altitude range. The results indicate that the method is viable whenever the difference of the net irradiance at the top and bottom of a layer is equal to or higher than the measurement uncertainty for net irradiance. This can be achieved by a high optical depth or a low single‐scattering albedo within the layer.

Document Type:Article
Title:A new method to retrieve the aerosol layer absorption coefficient from airborne flux density and actinic radiation measurements
AuthorsInstitution or Email of Authors
Bierwirth, EikeUniv. of Colorado, Boulder, CO, USA
Wendisch, ManfredUniv. Leipzig, Leipzig
Jäkel, EvelynJohannes Gutenberg Univ. Mainz, Mainz
Ehrlich, AndréUniv. Leipzig, Leipzig
Schmidt, K. SebastianUniv. of Colorado, Boulder, CO, USA
Stark, HaraldNOAA, Boulder, CO, USA
Pilewskie, PeterUniv. of Colorado, Boulder, CO, USA
Esselborn, MichaelDLR
Gobbi, Gian PaoloCNR, Rome, I
Ferrare, RichardNASA Langley Research Center, Hampton, VA, USA
Müller, ThomasIfT, Leipzig
Clarke, AntonyUniv. of Hawai‘i at Mānoa, Honolulu, HI, USA
Journal or Publication Title:Journal of Geophysical Research
Refereed publication:Yes
In Open Access:No
In ISI Web of Science:Yes
Page Range:pp. 1-11
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 Atmosphären- und Klimaforschung (old)
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Atmospheric Physics > Lidar
Deposited By: Jana Freund
Deposited On:16 Aug 2010 17:47
Last Modified:23 Jan 2014 11:36

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