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Time sampling effects on UV daily doses derived from satellite data

Bugliaro, Luca and Meerkötter, Ralf (2003) Time sampling effects on UV daily doses derived from satellite data. Arctic-Alpine Ecosystems and people in a changing Environment, 2003-02-23 - 2003-02-28, Tromso, (N). (Unpublished)

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Abstract

The determination of ultraviolet daily doses from satellite data is a very helpful method for investigating the biological impact of UV radiation on biological species over wide areas. To achieve this aim, geostationary or polar orbiting satellites can be used, as was done for instance in the EU project UVAC. There, two distinct climatologies of UV radiation were produced, one based on the Meteosat and one on the NOAA satellites for the derivation of cloud optical properties. Geostationary satellites allow in principle to probe the cloud fields many times a day, thus better accounting for the diurnal cycle of the varying clouds than polar orbiting satellites. However, in Northern latitudes their spatial resolution is significantly reduced compared to that of polar orbiting satellites. Furthermore, considering the high demands on cpu and processing times as well as on disk space, the problem of finding a reasonable compromise between number of cloud probes per day and accuracy naturally arises. To address this question we simulate the surface UV radiation for different diurnal cycles of cloud fields by means of the 3- dimensional radiative transfer code SHDOM. The results illustrate how the accuracy in computing UV daily doses depends on the number of cloud probes and the smoothing effects due to temporal and spatial variability. We further compare model results obtained for the typical temporal sampling of the NOAA and Meteosat satellites and show the importance of sampling around noon time. Herewith, this study, that has been performed in the framework of UVAC, may represent a basic tool for evaluating every satellite based climatology.

Document Type:Conference or Workshop Item (Poster)
Title:Time sampling effects on UV daily doses derived from satellite data
Authors:
AuthorsInstitution or Email of Authors
Bugliaro, LucaUNSPECIFIED
Meerkötter, RalfUNSPECIFIED
Date:February 2003
Status:Unpublished
Keywords:Time sampling, UV daily doses, polar orbiting satellites, geostationary satellites
Event Title:Arctic-Alpine Ecosystems and people in a changing Environment
Event Location:Tromso, (N)
Event Type:international Conference
Event Dates:2003-02-23 - 2003-02-28
Organizer:EURO CONFERENCE, ENVINET, NARP, Ny-Alesund LSF, UVAC, Norwegian Ministry of Environment, University of Tromso, NILU
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 > Atmospheric Remote Sensing
Deposited By: Dr.rer.nat. Luca Bugliaro Goggia
Deposited On:31 Jul 2007
Last Modified:27 Apr 2009 04:52

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