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| Titel |
Evaluation of the broadband surface solar irradiance derived from SCIAMACHY effective cloud fraction |
| VerfasserIn |
Ping Wang, Piet Stammes, Richard Mueller |
| Konferenz |
EGU General Assembly 2011
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 13 (2011) |
| Datensatznummer |
250047173
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| Zusammenfassung |
| Broadband surface solar irradiances (SSI) are, for the first time, derived from SCIAMACHY
(SCanning Imaging Absorption spectroMeter for Atmospheric CartograpHY) satellite
measurements. The retrieval algorithm, called FRESCO (Fast REtrieval Scheme for Clouds
from Oxygen A band) SSI is using the Heliosat relation for the consideration of clouds on the
solar irradiance. In contrast to the standard Heliosat relation, the cloud index is replaced by
the effective cloud fraction derived from the FRESCO cloud algorithm. The MAGIC
(Mesoscale Atmospheric Global Irradiance Code) algorithm is used to calculate clear-sky
SSI. The SCIAMACHY SSI product is validated against the globally distributed
BSRN (Baseline Surface Radiation Network) measurements and compared with
the ISCCP-FD (International Satellite Cloud Climatology Project Flux Dataset)
surface shortwave downwelling fluxes (SDF). For one year of data in 2008, the mean
difference between the instantaneous SCIAMACHY SSI and the hourly mean BSRN
global irradiances is -4 W/m2 (-1%) with a standard deviation of 101 W/m2 (20%).
The mean difference between the globally monthly mean SCIAMACHY SSI and
ISCCP-FD SDF is less than -12 W/m2 (-2%) for every month in 2006 and the standard
deviation is 62 W/m2 (12%). The correlation coefficient is 0.93 for SCIAMACHY SSI
and BSRN global irradiances and is greater than 0.96 for SCIAMACHY SSI and
ISCCP-FD SDF. The evaluation results show that the SCIAMACHY SSI product
achieves similar mean bias error and root mean square error as the surface solar
irradiances derived from polar orbiting satellites with higher spatial resolution. |
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