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Abstract:

The simulated low-frequency variability patterns of the atmospheric circulation, ranging from interannual to interdecadal timescales, are studied in an area encompassing southern South America. The experiment is a transient simulation performed with the IPSL CCM2 coupled global model, in which the greenhouse forcing is continuously increasing. The main modes of low-frequency variability are found to remain stationary throughout the simulation, suggesting they depend more on the internal dynamics of the atmospheric flow than on its external forcing. Inspection of the circulation regimes that represent the more recurrent patterns at interannual and interdecadal timescales showed that climate change manifests itself as a change in regime population, suggesting that the negative phase of the Antarctic Oscillation-like pattern becomes more frequented in a climate change scenario. Changes of regime occurrence are superimposed to a positive trend whose spatial pattern is reminiscent of the structure of the Antarctic Oscillation-mode of variability. Moreover, it resembles the spatial patterns of those regimes that show a significant change in population. The change in regime frequencies of the circulation patterns of low-frequency variability are in opposite phase with respect to the trend, thus, the behaviour of these patterns of variability, superimposed to a changing mean state, modulates the climate change signal. The analysis of the high frequencies, in terms of recurrent patterns representing intraseasonal and synoptic-scale of variability, shows no significant changes in regime characteristics, concerning both spatial and temporal behaviour. © Springer-Verlag 2006.

Registro:

Documento: Artículo
Título:Climate change in terms of modes of atmospheric variability and circulation regimes over southern South America
Autor:Solman, S.A.; Le Treut, H.
Filiación:Centro de Investigaciones del Mar y la Atmósfera (CIMA-CONICET/UBA), Dto. Cs. de la Atmósfera y los Océanos (UBA), Pabellón II 2 piso, 1428 Buenos Aires, Argentina
Laboratoire de Meteorologie Dynamique (LMD/CNRS), Université Paris 6, Case Courrier 99, Tour 45, Paris 75252, France
Palabras clave:annual variation; atmospheric circulation; climate change; decadal variation; South America
Año:2006
Volumen:26
Número:7-8
Página de inicio:835
Página de fin:854
DOI: http://dx.doi.org/10.1007/s00382-005-0107-3
Título revista:Climate Dynamics
Título revista abreviado:Clim. Dyn.
ISSN:09307575
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_09307575_v26_n7-8_p835_Solman

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Citas:

---------- APA ----------
Solman, S.A. & Le Treut, H. (2006) . Climate change in terms of modes of atmospheric variability and circulation regimes over southern South America. Climate Dynamics, 26(7-8), 835-854.
http://dx.doi.org/10.1007/s00382-005-0107-3
---------- CHICAGO ----------
Solman, S.A., Le Treut, H. "Climate change in terms of modes of atmospheric variability and circulation regimes over southern South America" . Climate Dynamics 26, no. 7-8 (2006) : 835-854.
http://dx.doi.org/10.1007/s00382-005-0107-3
---------- MLA ----------
Solman, S.A., Le Treut, H. "Climate change in terms of modes of atmospheric variability and circulation regimes over southern South America" . Climate Dynamics, vol. 26, no. 7-8, 2006, pp. 835-854.
http://dx.doi.org/10.1007/s00382-005-0107-3
---------- VANCOUVER ----------
Solman, S.A., Le Treut, H. Climate change in terms of modes of atmospheric variability and circulation regimes over southern South America. Clim. Dyn. 2006;26(7-8):835-854.
http://dx.doi.org/10.1007/s00382-005-0107-3