Por favor, use este identificador para citar o enlazar a este item:
http://hdl.handle.net/10261/107897
COMPARTIR / EXPORTAR:
SHARE CORE BASE | |
Visualizar otros formatos: MARC | Dublin Core | RDF | ORE | MODS | METS | DIDL | DATACITE | |
Título: | On the Sensitivity of Zonal-Index Persistence to Friction |
Autor: | Zurita-Gotor, Pablo CSIC ORCID | Palabras clave: | Annular mode Atmospheric circulation Eddies Quasigeostrophic models Arctic Oscillation |
Fecha de publicación: | 1-oct-2014 | Editor: | American Meteorological Society | Citación: | Journal of the Atmospheric Sciences, 2014, 7110): 3788–3800 | Resumen: | Friction is an important parameter in atmospheric modeling that may affect internal variability in a number of ways. It directly damps the annular-mode variability, but it also helps to maintain it through baroclinic feedbacks. Also, by determining the mean strength and position of the midlatitude jet, friction affects the internal dynamics that drive this variability. This work investigates the relevance of all of these factors for the sensitivity of the persistence of annular variability to changes in the zonal-mean friction using an idealized quasigeostrophic two-layer model. This model produces realistic variability, yet it is so simple that one can cleanly separate the different effects. It is found that the sensitivity of persistence to friction is dominated by the direct damping effect, while changes in the eddy momentum forcing and in the mean jet are not as important. As in more complex models, the persistence of the jet anomalies in this model decreases at all lags with increasing friction, but the long-time decorrelation decay rate of these anomalies is remarkably insensitive to friction. Although this implies that the eddy feedback must increase with friction to maintain the anomalies against the enhanced damping, it is shown that this is not due to baroclinic effects. A model that assumes that the eddy forcing does not change with friction can reproduce reasonably well the numerical results. The crucial factor that determines the model’s sensitivity to friction is the spectral structure of the eddy momentum forcing. | Versión del editor: | http://dx.doi.org/10.1175/JAS-D-14-0067.1 | URI: | http://hdl.handle.net/10261/107897 | DOI: | 10.1175/JAS-D-14-0067.1 | ISSN: | 0022-4928 | E-ISSN: | 1520-0469 |
Aparece en las colecciones: | (IGEO) Artículos |
Ficheros en este ítem:
Fichero | Descripción | Tamaño | Formato | |
---|---|---|---|---|
JAS_2014_71_10_3788.pdf | 1,78 MB | Adobe PDF | Visualizar/Abrir |
CORE Recommender
SCOPUSTM
Citations
5
checked on 22-abr-2024
WEB OF SCIENCETM
Citations
5
checked on 28-feb-2024
Page view(s)
279
checked on 24-abr-2024
Download(s)
282
checked on 24-abr-2024
Google ScholarTM
Check
Altmetric
Altmetric
NOTA: Los ítems de Digital.CSIC están protegidos por copyright, con todos los derechos reservados, a menos que se indique lo contrario.