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Título:
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On the lack of stratospheric dynamical variability in low-top versions of the CMIP5 models
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Autores:
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Charlton-Perez, Andrew J. ;
Baldwin, Mark P. ;
Birner, Thomas ;
Black, Robert X. ;
Butler, Amy H. ;
Calvo Fernández, Natalia ;
Davis, Nicholas A. ;
Gerber, Edwin P. ;
Gillett, Nathan ;
Hardiman, Steven ;
Kim, Junsu ;
Krüger, Kirstin ;
Lee, Yun-Young ;
Manzini, Elisa ;
McDaniel, Brent A. ;
Polvani, Lorenzo ;
Reichler, Thomas ;
Shaw, Tiffany A. ;
Sigmond, Michael ;
Son, Seok-Woo ;
Toohey, Matthew ;
Wilcox, Laura ;
Yoden, Shigeo ;
Christiansen, Bo ;
Lott, François ;
Shindell, Drew ;
Yukimoto, Seiji ;
Watanabe, Shingo
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Tipo de documento:
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texto impreso
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Editorial:
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American Geophysical Union, 2013-03-27
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Dimensiones:
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application/pdf
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Nota general:
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info:eu-repo/semantics/openAccess
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Idiomas:
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Palabras clave:
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Estado = Publicado
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Materia = Ciencias: Física: Astrofísica
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Materia = Ciencias: Física: Astronomía
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Materia = Ciencias: Física: Física atmosférica
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Tipo = Artículo
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Resumen:
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We describe the main differences in simulations of stratospheric climate and variability by models within the fifth Coupled Model Intercomparison Project (CMIP5) that have a model top above the stratopause and relatively fine stratospheric vertical resolution (high-top), and those that have a model top below the stratopause (low-top). Although the simulation of mean stratospheric climate by the two model ensembles is similar, the low-top model ensemble has very weak stratospheric variability on daily and interannual time scales. The frequency of major sudden stratospheric warming events is strongly underestimated by the low-top models with less than half the frequency of events observed in the reanalysis data and high-top models. The lack of stratospheric variability in the low-top models affects their stratosphere-troposphere coupling, resulting in short-lived anomalies in the Northern Annular Mode, which do not produce long-lasting tropospheric impacts, as seen in observations. The lack of stratospheric variability, however, does not appear to have any impact on the ability of the low-top models to reproduce past stratospheric temperature trends. We find little improvement in the simulation of decadal variability for the high-top models compared to the low-top, which is likely related to the fact that neither ensemble produces a realistic dynamical response to volcanic eruptions.
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En línea:
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https://eprints.ucm.es/id/eprint/25708/1/calvofernandez24libre.pdf
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