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

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 t...

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Bibliographic Details
Published in:Journal of Geophysical Research
Main Authors: Bierwirth, Eike, Wendisch, Manfred, Jäkel, Evelyn, Ehrlich, André, Schmidt, K. Sebastian, Stark, Harald, Pilewskie, Peter, Esselborn, Michael, Gobbi, Gian Paolo, Ferrare, Richard, Müller, Thomas, Clarke, Antony
Format: Other Non-Article Part of Journal/Newspaper
Language:English
Published: Wiley 2010
Subjects:
Lidar
Arctic
albedo
Online Access:https://elib.dlr.de/64995/
https://elib.dlr.de/64995/1/BIERWIRTH.pdf
http://www.agu.org/journals/jd/jd1011/2009JD012523/2009JD012523.pdf
Description
Summary: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 (SMARTâ€ÂAlbedometer), 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 singleâ€Âscattering albedo within the layer.

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