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A new actinic flux 4pi-spectroradiometer: instrument design and application to clear sky and broken cloud conditions

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.

Full text not available from this repository.

Official URL: www.atmos-chem-phys.org/acp/3/1965/

Abstract

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.

Document Type:Article
Additional Information: LIDO-Berichtsjahr=2004,
Title:A new actinic flux 4pi-spectroradiometer: instrument design and application to clear sky and broken cloud conditions
Authors:
AuthorsInstitution or Email of Authors
Eckstein, EviUNSPECIFIED
Perner, DieterUNSPECIFIED
Brühl, ChristophUNSPECIFIED
Trautmann, ThomasUNSPECIFIED
Date:2003
Journal or Publication Title:Atmospheric Chemistry and Physics
Refereed publication:Yes
In ISI Web of Science:Yes
Volume:3
Page Range:pp. 1965-1979
Status:Published
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
Location: Oberpfaffenhofen
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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