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| Titel |
Homogenization of surface shortwave radiation data using satellite cloud cover and clear sky simulations |
| VerfasserIn |
R. Becker, K. Behrens |
| Konferenz |
EGU General Assembly 2012
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 14 (2012) |
| Datensatznummer |
250071246
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| Zusammenfassung |
| The German national radiation measurement network comprises 82 automatic sites , 29
manned sites with shaded and unshaded pyranometer and the BSRN station at Lindenberg.
The quality assessment routinely applied takes into account the basic astronomical and
empirical considerations as well as some interdependencies like total to diffuse flux
relation and cross checking with sunshine duration. A more advanced approach
attempts to routinely utilise timeseries of clear sky radiative transfer simulations for
every site. For that purpose a link to cloud coverage obtained from Meteosat second
generation geostationary satellite data, highly resoluted in time and space, was
established. Longer-term (with respect to the predefined calibration cycle of 30 month for
automatic stations) analysis allows for the detection of sensor degradation or local
disturbances of operational service. Furthermore using satellite cloud mask enables
the identification of larger clear sky regions characterised by similar atmospheric
conditions.
The paper provides an overview of DWD surface radiation network and the current activities
to improve automatic quality assessment using remotely sensed data and clear sky modelling
for the upgrading of radiation data.
Focuses are set on the effects of using measured and/or forecasted profiles of temperature,
humidity, ozone and areasol instead of standard profiles. Secondly, aspects of using different
models to simulate broadband shortwave radiation will be discussed. |
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