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Effects of altitude and aerosol on UV radiation

Pfeifer, Monika and Koepke, Peter and Reuder, Jochen (2006) Effects of altitude and aerosol on UV radiation. Journal of Geophysical Research, 111, D01203-1-D01203-11. Wiley. DOI: 10.1029/2005JD006444

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Measurements of erythemally weighted UV radiation during about 600 days at different sites in Bolivia and Germany ranging from 550 to 5240 m above sea level have been used to derive the altitude effect AE under cloud-free conditions. In Germany, AE values between 7 and 16%/km have been obtained. In Bolivia, the altitude effect between the lowlands and the Bolivian plateau reached values of 5–10%/km. An altitude effect of 8–23%/km has been measured between the plateau and a high-mountain station. In accordance with previous studies these results indicate that the altitude effect of UV irradiance cannot be described by a single number in %/km, because it strongly depends on the atmospheric and surface parameters. In order to understand the high variability of the AE, the effects due to variations in solar elevation, albedo, and aerosol properties on UV radiation and the AE have been analyzed. To eliminate the influence of clouds, an algorithm for the selection of cloud-free time intervals has been developed and applied. Furthermore, the measured data have been normalized to a fixed ozone content to avoid masking of the AE by different ozone amount. In addition, the background altitude effect, i.e., the AE resulting only from the reduced barometric pressure and reduced ozone content with increasing altitude, has been modeled. Depending on solar elevation and albedo, it ranges between 3 and 7%/km. Measured higher values of the AE, as well as negative values of the AE, are explained by the specific regional aerosol conditions, with important sources at high altitudes. The aerosol influence on UV is shown in detail for extreme conditions after strong bonfires in connection with a local holiday.

Item URL in elib:https://elib.dlr.de/21255/
Document Type:Article
Title:Effects of altitude and aerosol on UV radiation
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Koepke, PeterLMU MünchenUNSPECIFIED
Reuder, JochenUniv. of Bergen, NUNSPECIFIED
Date:January 2006
Journal or Publication Title:Journal of Geophysical Research
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:Yes
DOI :10.1029/2005JD006444
Page Range:D01203-1-D01203-11
Keywords:UV radiation, altitude, aerosol
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 > Cloud Physics and Traffic Meteorology
Deposited By: Pfeifer, Monika
Deposited On:24 Jul 2007
Last Modified:08 Mar 2018 18:43

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