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Abstract:

Intraseasonal (IS) variability in South America is efficiently described through the first empirical orthogonal function of filtered precipitation or outgoing longwave radiation (OLR) anomalies. In the 30-90-day band, the leading OLR pattern between October and April is a dipole with centers of action in the South Atlantic Convergence Zone (SACZ) and southeastern South America (SESA). The Madden Julian Oscillation (MJO) was shown to have an impact on the rainfall in South America, with greater influence during the austral warm season. The aim of this study is therefore to assess the modulation of the MJO in the activity of the leading pattern of variability in South America, named the 3090-Seasonal-Intraseasonal (SIS) pattern. It was found that the most intense periods of activity of the SIS pattern appear to be related to intense MJO events with coherent eastward propagation. Furthermore, positive 3090-SIS phases, associated with enhanced (inhibited) convection over the SESA (SACZ) region generally occur during MJO progression from the eastern Indian Ocean to the Western Pacific (i.e., Maritime Continent sector). On the contrary, negative 3090-SIS phases, associated with enhanced (inhibited) convection over SACZ (SESA) are observed when the MJO active phase locates between the Western Pacific and the western Indian Ocean (African sector). The 3090-SIS pattern modulation by the MJO opens the opportunity to develop skillful subseasonal prediction tools in South America. © 2017 by the authors.

Registro:

Documento: Artículo
Título:MJO modulating the activity of the leading mode of intraseasonal variability in South America
Autor:Alvarez, M.S.; Vera, C.S.; Kiladis, G.N.
Filiación:Departamento de Ciencias de la Atmósfera y los Océanos, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Buenos Aires, C1428EGA, Argentina
Centro de Investigaciones del Mar y la Atmósfera (CIMA), Instituto Franco Argentino sobre Estudios de Clima y sus Impactos (UMI IFAECI)/CNRS-CONICET, Universidad de Buenos Aires, Buenos Aires, C1428EGA, Argentina
NOAA Earth System Research Laboratory, Physical Sciences Division, Boulder, CO 80305, United States
Palabras clave:Intraseasonal; OLR; SIS pattern; South America; Modulation; Orthogonal functions; Wind effects; Empirical Orthogonal Function; Intra-seasonal; Intraseasonal variability; Madden-Julian oscillation; Outgoing longwave radiation; South America; South atlantic convergence zones; Southeastern South America; Climatology; air-sea interaction; atmospheric convection; longwave radiation; Madden-Julian oscillation; precipitation (climatology); seasonal variation; Indian Ocean; Indian Ocean (East); Pacific Ocean; Pacific Ocean (West); South America
Año:2017
Volumen:8
Número:12
DOI: http://dx.doi.org/10.3390/atmos8120232
Título revista:Atmosphere
Título revista abreviado:Atmosphere
ISSN:20734433
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_20734433_v8_n12_p_Alvarez

Referencias:

  • Vera, C.S., Alvarez, M.S., Gonzalez, P.L.M., Liebmann, B., Kiladis, G.N., Seasonal cycle of precipitation variability in South America on intraseasonal timescales (2017) Clim. Dyn, pp. 1-11
  • Gonzalez, P.L.M., Vera, C.S., Summer precipitation variability over South America on long and short intraseasonal timescales (2014) Clim. Dyn, 43, pp. 1993-2007
  • Alvarez, M.S., Vera, C.S., Kiladis, G.N., Liebmann, B., Intraseasonal variability in South America during the cold season (2014) Clim. Dyn, 42, pp. 3253-3269
  • Alvarez, M.S., Vera, C.S., Kiladis, G.N., Liebmann, B., Influence of the Madden Julian Oscillation on precipitation and surface air temperature in South America (2016) Clim. Dyn, 46, pp. 245-262
  • Barrett, B.S., Carrasco, J.F., Testino, A.P., Madden-Julian Oscillation (MJO) Modulation of atmospheric circulation and chilean winter precipitation (2012) J. Clim, 25, pp. 1678-1688
  • Jones, C., Waliser, D.E., Lau, K.M., Stern, W., Global occurrences of extreme precipitation and the Madden-Julian Oscillation: Observations and predictability (2004) J. Clim, 17, pp. 4575-4589
  • Paegle, J.N., Byerle, L.A., Mo, K.C., Intraseasonal modulation of South American summer precipitation (2000) Mon. Weather Rev, 128, pp. 837-850
  • De Souza, E.B., Ambrizzi, T., Modulation of the intraseasonal rainfall over tropical Brazil by the Madden-Julian oscillation (2006) Int. J. Climatol, 26, pp. 1759-1776
  • Castro Cunningham, C.A., De Albuquerque Cavalcanti, I.F., Intraseasonal modes of variability affecting the South Atlantic Convergence Zone (2006) Int. J. Climatol, 26, pp. 1165-1180
  • Carvalho, L.M.V., Jones, C., Liebmann, B., The South Atlantic Convergence Zone: Intensity, form, persistence, and relationships with intraseasonal to interannual activity and extreme rainfall (2004) J. Clim, 17, pp. 88-108
  • Jones, C., Carvalho, L.M.V., Active and break phases in the South American monsoon system (2002) J. Clim, 15, pp. 905-914
  • Jones, C., Carvalho, L.M.V., Spatial-intensity variations in extreme Precipitation in the Contiguous United States and the Madden-Julian Oscillation (2012) J. Clim, 25, pp. 4898-4913
  • Wheeler, M.C., Hendon, H.H., An all-season real-time multivariate MJO Index: Development of an index for monitoring and prediction (2004) Mon. Weather Rev, 132, pp. 1917-1932
  • Kalnay, E., Kanamitsu, M., Kistler, R., Collins, W., Deaven, D., Gandin, L., Iredell, M., Woollen, J., The NCEP/NCAR 40-Year Reanalysis Project (1996) Bull. Am. Meteorol. Soc, 77, pp. 437-471
  • Matthews, A.J., Propagation mechanisms for the Madden-Julian Oscillation (2000) Q. J. R. Meteorol. Soc, 126, pp. 2637-2651
  • Liebmann, B., Smith, C.A., Description of a Complete (Interpolated) outgoing longwave radiation dataset (1996) Bull. Am. Meteorol. Soc, 77, pp. 1275-1277
  • Flatau, M., Kim, Y.J., Interaction between the MJO and Polar Circulations (2013) J. Clim, 26, pp. 3562-3574
  • Dee, D.P., Uppala, S.M., Simmons, A.J., Berrisford, P., Poli, P., Kobayashi, S., Andrae, U., Bauer, P., The ERA-Interim reanalysis: Configuration and performance of the data assimilation system (2011) Q. J. R. Meteorol. Soc, 137, pp. 553-597
  • Kiladis, G.N., Dias, J., Straub, K.H., Wheeler, M.C., Tulich, S.N., Kikuchi, K., Weickmann, K.M., Ventrice, M.J., A Comparison of OLR and circulation-based indices for Tracking the MJO (2014) Mon. Weather Rev, 142, pp. 1697-1715
  • Kim, H.M., Webster, P.J., Toma, V.E., Kim, D., Predictability and prediction skill of the MJO in two operational forecasting systems (2014) J. Clim, 27, pp. 5364-5378

Citas:

---------- APA ----------
Alvarez, M.S., Vera, C.S. & Kiladis, G.N. (2017) . MJO modulating the activity of the leading mode of intraseasonal variability in South America. Atmosphere, 8(12).
http://dx.doi.org/10.3390/atmos8120232
---------- CHICAGO ----------
Alvarez, M.S., Vera, C.S., Kiladis, G.N. "MJO modulating the activity of the leading mode of intraseasonal variability in South America" . Atmosphere 8, no. 12 (2017).
http://dx.doi.org/10.3390/atmos8120232
---------- MLA ----------
Alvarez, M.S., Vera, C.S., Kiladis, G.N. "MJO modulating the activity of the leading mode of intraseasonal variability in South America" . Atmosphere, vol. 8, no. 12, 2017.
http://dx.doi.org/10.3390/atmos8120232
---------- VANCOUVER ----------
Alvarez, M.S., Vera, C.S., Kiladis, G.N. MJO modulating the activity of the leading mode of intraseasonal variability in South America. Atmosphere. 2017;8(12).
http://dx.doi.org/10.3390/atmos8120232