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| Titel |
Representation of XX century midlatitude atmospheric variability in ERA-CLIM simulations |
| VerfasserIn |
Alessandro Dell'Aquila, Susanna Corti, Tim Palmer, Sandro Calmanti, Antje Weisheimer, Hans Hersbach, Carole Peubey, Adrian Simmons |
| Konferenz |
EGU General Assembly 2015
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 17 (2015) |
| Datensatznummer |
250112302
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| Publikation (Nr.) |
 EGU/EGU2015-12448.pdf |
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| Zusammenfassung |
| We analyse the representation of midlatitude winter atmospheric variability as depicted in XX century-long simulations. We analyse the recent atmospheric integrations produced in the framework of ERA-CLIM project in terms of their capability in reproducing midlatitude planetary waves variability as well as baroclinic activity compared against several reanalysis products.
The simulations of ERA-CLIM project (the ERA-20C reanalysis product together with ERA-20CM atmospheric model integrations) could be a quite appealing source of information to catch signals of long term changes.
We apply process oriented metrics and ad hoc indexes to validate the ERA-CLIM simulations and, on the same time, to evaluate signals of multi-decadal variability for planetary and baroclinic waves.
When observational fields are assimilated (even if only the surface ones, as in the case of ERA-20C reanalysis), the representation of atmospheric variability for the last decades of XX century is in a fair close agreement with other reanalysis products (i.e. NCEP , ERA-Interim reanalysis). However, in the first part of the century (up to 40s’ ) the planetary and baroclinic waves exhibit a quite low activity in the reanalysis. This behaviour cannot be found in the ERA-20CM atmospheric integrations that show, on the other hand, a huge variability, in term of representation of large scale atmospheric waves, between different ensemble members. |
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