Eckstein, Evi and Perner, Dieter and Brühl, Christoph and Trautmann, Thomas (2003) A new actinic flux 4pi-spectroradiometer: instrument design and application to clear sky and broken cloud conditions. Atmospheric Chemistry and Physics, 3, pp. 1965-1979.
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Official URL: www.atmos-chem-phys.org/acp/3/1965/
A new 4 pi-spectroradiometer was developed for measuring actinic flux especially under cloudy conditions based on a fixed grating imaging spectrograph and a CCD-detector leading to a simultaneous measurement of the spectrum. The new instrument incorporates a novel optical head with a 4 pi-field of view independent of angle of incidence. Comparisons with the actinic flux spectroradiometer of the Institute of Atmospheric Chemistry of Forschungszentrum Jülich showed a very good agreement within the limit of the uncertainties of the two instruments. Our spectroradiometer was applied to investigate the effects of broken clouds on the actinic flux and photolysis frequencies on the ground during the BERLIOZ campaign. Reductions as well as enhancements compared to the clear sky case were seen, both effects are larger in the UV-A than the UV-B spectral region. Furthermore the new instrument was used for simultaneous measurements in different altitudes on a tower to study the transmission and attenuation of actinic flux in low clouds. A correlation of attenuation with the simultaneously measured liquid water content of the cloud was found.
|Title:||A new actinic flux 4pi-spectroradiometer: instrument design and application to clear sky and broken cloud conditions|
|Journal or Publication Title:||Atmospheric Chemistry and Physics|
|In ISI Web of Science:||Yes|
|Page Range:||pp. 1965-1979|
|Keywords:||Spectraradiometry, actinic radiation, clear-sky effects, cloud effects, ultraviolet radiation|
|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):||UNSPECIFIED|
|Institutes and Institutions:||Remote Sensing Technology Institute|
|Deposited By:||Cornelia Roehl|
|Deposited On:||10 Feb 2006|
|Last Modified:||06 Jan 2010 22:25|
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