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Abstract:

This study investigates the spatial and temporal characteristics of cold surges that propagates northward along the eastern flank of the Andes from subtropical to tropical South America analysing wintertime in situ daily minimum temperature observations from Argentina, Bolivia and Peru and ERA-40 reanalysis over the 1975-2001 period. Cold surges usually last 2 or 3 days but are generally less persistent in the southern La Plata basin compared to tropical regions. On average, three to four cold surges are reported each year. Our analysis reveals that 52 % of cold episodes registered in the south of La Plata basin propagate northward to the northern Peruvian Amazon at a speed of around 20 m s-1. In comparison to cold surges that do not reach the tropical region, we demonstrate that these cold surges are characterized, before they reach the tropical region, by a higher occurrence of a specific circulation pattern associated to southern low-level winds progression toward low latitudes combined with subsidence and dry condition in the middle and low troposphere that reinforce the cold episode through a radiative effect. Finally, the relationship between cold surges and atmosphere dynamics is illustrated for the two most severe cold intrusions that reached the Peruvian and Bolivian Amazon in the last 20 years. © 2012 Springer-Verlag Berlin Heidelberg.

Registro:

Documento: Artículo
Título:Revisiting wintertime cold air intrusions at the east of the Andes: Propagating features from subtropical Argentina to Peruvian Amazon and relationship with large-scale circulation patterns
Autor:Espinoza, J.C.; Ronchail, J.; Lengaigne, M.; Quispe, N.; Silva, Y.; Bettolli, M.L.; Avalos, G.; Llacza, A.
Filiación:Instituto Geofísico del Perú (IGP), Calle Badajoz 169 Mayorazgo, Ate., Lima 03, Peru
Sorbonne Paris Cité and Laboratoire d'Océanographie, Climat: Expérimentation et Approches Numériques (LOCEAN), Univ Paris Diderot, Paris, France
Institut de Recherche pour le Développement (IRD) and LOCEAN, Paris, France
Servicio Nacional de Meteorología e Hidrología (SENAMHI), Lima, Peru
Departamento de Ciencias de la Atmósfera y los Océanos (FCEN), Universidad de Buenos Aires, Buenos Aires, Argentina
Palabras clave:Argentina; Bolivian Amazon; Circulation patterns; Cold surges; Low-level winds; Peruvian Amazon; Self-organizing maps; air temperature; atmospheric circulation; atmospheric dynamics; cold air; spatiotemporal analysis; troposphere; winter; Amazonia; Andes; Argentina; Bolivia; La Plata Basin; Peru
Año:2013
Volumen:41
Número:7-8
Página de inicio:1983
Página de fin:2002
DOI: http://dx.doi.org/10.1007/s00382-012-1639-y
Título revista:Climate Dynamics
Título revista abreviado:Clim. Dyn.
ISSN:09307575
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_09307575_v41_n7-8_p1983_Espinoza

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Citas:

---------- APA ----------
Espinoza, J.C., Ronchail, J., Lengaigne, M., Quispe, N., Silva, Y., Bettolli, M.L., Avalos, G.,..., Llacza, A. (2013) . Revisiting wintertime cold air intrusions at the east of the Andes: Propagating features from subtropical Argentina to Peruvian Amazon and relationship with large-scale circulation patterns. Climate Dynamics, 41(7-8), 1983-2002.
http://dx.doi.org/10.1007/s00382-012-1639-y
---------- CHICAGO ----------
Espinoza, J.C., Ronchail, J., Lengaigne, M., Quispe, N., Silva, Y., Bettolli, M.L., et al. "Revisiting wintertime cold air intrusions at the east of the Andes: Propagating features from subtropical Argentina to Peruvian Amazon and relationship with large-scale circulation patterns" . Climate Dynamics 41, no. 7-8 (2013) : 1983-2002.
http://dx.doi.org/10.1007/s00382-012-1639-y
---------- MLA ----------
Espinoza, J.C., Ronchail, J., Lengaigne, M., Quispe, N., Silva, Y., Bettolli, M.L., et al. "Revisiting wintertime cold air intrusions at the east of the Andes: Propagating features from subtropical Argentina to Peruvian Amazon and relationship with large-scale circulation patterns" . Climate Dynamics, vol. 41, no. 7-8, 2013, pp. 1983-2002.
http://dx.doi.org/10.1007/s00382-012-1639-y
---------- VANCOUVER ----------
Espinoza, J.C., Ronchail, J., Lengaigne, M., Quispe, N., Silva, Y., Bettolli, M.L., et al. Revisiting wintertime cold air intrusions at the east of the Andes: Propagating features from subtropical Argentina to Peruvian Amazon and relationship with large-scale circulation patterns. Clim. Dyn. 2013;41(7-8):1983-2002.
http://dx.doi.org/10.1007/s00382-012-1639-y