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| Titel |
ERA-40 surface solar radiation and cloudiness variability in Europe and their connection with atmospheric circulation patterns |
| VerfasserIn |
Arturo Sanchez-Lorenzo, Marc Chiacchio, Joan A. Lopez-Bustins, Josep Calbó, Martin Wild |
| Konferenz |
EGU General Assembly 2010
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 12 (2010) |
| Datensatznummer |
250044180
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| Zusammenfassung |
| This work presents seasonal variability of surface solar radiation and cloud cover (at high,
medium and low levels) over Europe, provided by the Reanalysis ERA-40, and
their relations with atmospheric circulation patterns or teleconnections during the
1948-2002 period. Due to the current uncertainty in the explanation and quantification of
aerosols/clouds contribution to the dimming/brightening phenomena, it seems important to
analyze their relationships to the main circulation patterns in order to detect possible
changes in atmospheric dynamics linked with the trends in surface solar radiation
and/or cloudiness during the last decades. Teleconnection patterns related to the
ERA-40 fields have been obtained by using: 1) conventional indices that simplify the
well-known spatial structure of pressure systems such as the El Niño/Southern Oscillation
(ENSO), North Atlantic Oscillation (NAO) or Western Mediterranean Oscillation
(WeMO); 2) canonical correlation analysis, by using the NCEP/NCAR reanalysis sea
level pressure (SLP) and 500 hPa geopotential height as the predictor variables
and the surface solar radiation or cloudiness variables as the predictand variables.
The results show the important role of the NAO and blocking situations during
the wintertime over Europe with interesting relationships with ENSO and WeMO
during the autumn season. The results in some Mediterranean areas show that are
few coincidences with those results found with precipitation in previous works. |
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