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          Institute: MPI für Chemie     Collection: Publikationen MPI für Chemie     Display Documents

ID: 14638.0, MPI für Chemie / Publikationen MPI für Chemie
Actinic radiation and photolysis processes in the lower troposphere: Effect of clouds and aerosols
Authors:Junkermann, W.; Brühl, C.; Perner, D.; Eckstein, E.; Trautmann, T.; Früh, B.; Dlugi, R.; Gori, T.; Ruggaber, A.; Reuder, J.; Zelger, M.; Hofzumahaus, A.; Kraus, A.; Rohrer, F.; Brüning, D.; Moortgat, G.; Horowitz, A.; Tadic, J.
Date of Publication (YYYY-MM-DD):2002-05
Title of Journal:Journal of Atmospheric Chemistry
Journal Abbrev.:J. Atmos. Chem.
Issue / Number:1
Start Page:413
End Page:441
Review Status:Peer-review
Audience:Experts Only
Abstract / Description:Within the German Tropospheric Research Program (TFS) a series of projects were performed focussing on aspects of radiation transfer and the effects of UV-radiation on air chemistry. The individual projects covered laboratory investigations, instrument development for photolysis processes as well as field studies of actinic radiation and comparison to model calculations. One and three-dimensional models were tested against field campaign data. The results confirm the improvement of measurement technology achieved through deployment of new techniques like spectroradiometry that offer a wider range of investigations than was previously attainable using chemical actinometry or fixed wavelength filter radiometry. Reasonable agreement was also found between measurements and models for a few selected and well defined cloudy conditions. On the other hand, using simple stratiform geometry models yielded significant deviations between measurement and model in both directions particularly in the case of high zenith angles and with high aerosol load. Further tools both for experimental investigations and for model calculations were developed within the framework of the Troposphere Research Program (TFS) and deficiencies were identified demanding further investigations when broken clouds and more complex cloud layers prevail.
Free Keywords:actinic radiation; aerosols; clouds; photolysis; spectroradiometry; 3D-model
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Chemie/Chemie der Atmosphäre
External Affiliations:Fraunhofer Inst Atmosphar Umweltforsch, Kreuzeckbahnstr 19, D-8100 Garmisch Partenkirchen, Germany; Univ Mainz, Inst Phys Atmosphare, D-6500 Mainz, Germany; Wissensch Arbeitsgrp Atmosphar Prozesse, Munich, Germany; Forschungszentrum Julich, Inst Chem & Dynam Geosphare, Julich, Germany
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