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Abstract:

This paper explores the relation between the inter-annual variability of the austral South American monsoon onset and end dates and the inter-annual variability of rainfall in September and May in subtropical South America. Outgoing longwave radiation (OLR) was used to define the onset and end dates of the convective season. Precipitation records were taken from national or state agencies of the region. Other surface and tropospheric variables were taken from NCEP/NCAR reanalysis. A 5 d canonical correlation analysis between rainfall in subtropical South America east of the Andes and the tropical convection of the South American monsoon estimated by the OLR shows that these variables are related during the austral autumn and spring. In both seasons, the first modes are very similar and indicate that rainfall in southern Brazil is negatively correlated with convection over the eastern part of the tropical continent. Because a delay (an early advent) of the monsoon end increases (reduces) the period with convection over the tropics, while the contrary occurs with the onset, rainfall composites between months corresponding to cases with extreme dates at the onset or the end of the tropical convective season show an important rainfall signal in southern Brazil during May and September. During May the early (delayed) end date is associated with enhanced (decreased) rainfall in most of the subtropical region. In September, the early (delayed) onset is associated with decreased (enhanced) rainfall only in southern Brazil, while in Argentina and Uruguay there is an opposite signal, non symmetric with respect to the May case. In May, the mean low-level flow of moisture from the tropical continent over eastern subtropical South America is considerably greater in the cases with an advanced monsoon end than in those with a delayed end, while in September, the composite differences between years with an early and a delayed onset show enhanced moisture advection from the tropical continent over most of Argentina and Uruguay, and a reduction over southern Brazil and Paraguay.

Registro:

Documento: Artículo
Título:Relation between the onset and end of the South American summer monsoon and rainfall in subtropical South America
Autor:González, M.; Barros, V.; Doyle, M.
Filiación:Department of Atmospheric Sciences, University of Buenos Aires 2 piso, Ciudad Universitaria, 1428 Capital Federal, Buenos Aires, Argentina
Palabras clave:Monsoon; Outgoing longwave radiation; Rainfall; Subtropical South America; Tropical convection; annual variation; convection; longwave radiation; monsoon; rainfall; subtropical region; summer; South America
Año:2002
Volumen:21
Número:2
Página de inicio:141
Página de fin:155
DOI: http://dx.doi.org/10.3354/cr021141
Título revista:Climate Research
Título revista abreviado:Clim. Res.
ISSN:0936577X
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_0936577X_v21_n2_p141_Gonzalez

Referencias:

  • Aceituno, P., On the functioning of the Southern Oscillation in the South American sector. Part I: Surface climate (1988) Mon Weather Rev, 116, pp. 505-524
  • Aceituno, P., Garreaud, R., Impacto de los fenómenos El Niño y La Niña en regímenes fluviométricos andinos (1995) Rev Soc Chilena Energía Hidraúlica, 10, pp. 33-43
  • Arkin, P.A., Ardanuy, P.E., Estimating climatic scale precipitation from space: A review (1989) J Clim, 2, pp. 1229-1238
  • Diaz, A.F., Studzinski, C.D., Mechoso, C.R., Relationship between precipitation anomalies in Uruguay and Southern Brazil and sea surface temperature in the Pacific and Atlantic Oceans (1998) J Clim, 11, pp. 251-271
  • Douglas, M., Nicolini, M., Saulo, C., Observational evidences of a low level jet east of the Andes during January-March 1998 (1998) Meteorologica, 23, pp. 63-72
  • Doyle, M., (1994) Maximum 200 and 300 hPa Winds in the South-American Sector and Near Ocean, , Seminar, Department of Atmospheric Science, University of Buenos Aires
  • Doyle, M., (2001) On Some of the Factors Controlling Summer Precipitation in Subtropical Argentina, , PhD thesis, University of Buenos Aires
  • Doyle, M., Barros, V., Relationship between water vapor sources and rainfall over Southern South America (2000) Sixth International Conference on Southern Hemisphere Meteorology and Oceanography, pp. 260-261. , American Meteorological Society, Santiago de Chile
  • Fu, R., Zhu, B., Dickinson, R., How does the atmosphere and land surface influence the seasonal changes in convection in Tropical Amazon? (1999) J Clim, 12, pp. 1306-1321
  • Gandú, A.W., Silva Diaz, P.L., Impact of tropical heat sources on the South American tropospheric circulation and subsidence (1998) J Geophys Res, 103, pp. 6001-6015
  • González, M., Barros, V., Statistical features of mean rainfall annual cycle and its anomalies in subtropical Argentina (1996) Meteorologica, 21, pp. 15-26
  • González, M., Barros, V., The relation between tropical convection in South America and the end of the dry period in subtropical Argentina (1998) Int J Climatol, 18, pp. 1669-1685
  • González, M., Barros, V., South American monsoon onset and end date prediction using outgoing longwave radiation and sea surface temperature (2000) Sixth International Conference on Southern Hemisphere Meteorology and Oceanography, pp. 124-125. , American Meteorological Society, Santiago de Chile
  • Green, P., (1978) Analyzing Multivariate Data, , Chapters 8 and 9. Dryden Press, Hinsdale, IL
  • Grimm, A., Ferraz, S., Gomez, J., Precipitation anomalies in Southern Brazil associated with El Niño and La Niña events (1998) J Clim, 11, pp. 2863-2880
  • Grimm, A., Barros, V., Doyle, M., Climate variability in Southern South America associated with El Niño and La Niña events (2000) J Clim, 1, pp. 35-58
  • Gruber, A., Krueger, A.F., The status of the NOAA outgoing longwave radiation data set (1984) Bull Am Meteorol Soc, 65, pp. 958-962
  • Hastenrath, S., Interannual variability and annual cycle: Mechanisms of circulation and climates in the tropical America sector (1984) Mon Weather Rev, 112, pp. 1097-1107
  • Heddinghaus, T., Krueger, A., Annual and interannual variations in outgoing longwave radiation over the tropics (1981) Mon Weather Rev, 109, pp. 1208-1218
  • Horel, J.D., Hahmann, A.N., Geisler, J.E., An investigation of the annual cycle of convective activity over the tropical Americas (1989) J Clim, 2, pp. 1388-1403
  • Janowiak, J.E., Krueger, A.F., Arkin, P.A., Gruber, A., Atlas of outgoing lonwave radiation derived from NOAA satellite data (1985) NOAA Atlas No. 6, , NOAA/NWS/NESDIS, US Department of Commerce, Silver Spring, MD
  • Kalnay, E., Kanamitsi, M., Kistler, R., Collins, W., The NCEP/NCAR reanalysis 40 years-project (1996) Bull Am Meteorol Soc, 77, pp. 437-471. , 18 others
  • Kiladis, G., Diaz, H., Global climatic anomalies associated with extremes in the Southern Oscillation (1989) J Clim, 2, pp. 1069-1090
  • Kousky, V.E., Pentad outgoing longwave radiation climatology for the South America sector (1988) Rev Brasilera Meteorol, 3, pp. 217-231
  • Kousky, V.E., The South American monsoon system (1999) 10th Global Change Studies, pp. 215-217. , American Meteorological Society, Dallas
  • Labraga, J., Frumento, O., Lopez, M., The atmospheric water vapor cycle in South America and the tropospheric circulation (2000) J Clim, 13, pp. 1899-1915
  • Lenters, J., Cook, K., Simulation and diagnosis of the regional summertime precipitation climatology of South America (1995) J Clim, 8, pp. 2988-3005
  • Liebmann, B., Hartmann, D., Interannual variations of outgoing IR associated with tropical circulation changes during 1974-78 (1982) J Atmos Sci, 39, pp. 1153-1162
  • Livezey, R., Chen, W., Statistical field significance and its determination by Monte Carlo techniques (1983) Mon Weather Rev, 111, pp. 46-59
  • Marengo, J., Liebmann, B., Kousky, V., Filizola, N., Wainer, I., Onset and end of the rainy season in the Brazilian Amazon basin (2001) J Clim, 14, pp. 833-852
  • Mitchell, T., Wallace, J., The annual cycle in equatorial convection and sea surface temperature (1992) J Clim, 5, pp. 1140-1156
  • Mo, K.C., Higgins, R.W., Large-scale atmospheric moisture transport as evaluated in the NCEP/NCAR and NASA /DAO reanalysis (1996) J Clim, 9, pp. 1531-1545
  • Morrissey, M.L., Graham, N.E., Recent trends in rain gauges precipitation measurements from the tropical Pacific: Evidence for an enhanced hydrological cycle (1996) Bull Am Meteorol Soc, 77, pp. 1207-1219
  • Nogués-Paegle, J., Mo, K.C., Alternating wet and dry conditions over South America during summer (1997) Mon Weather Rev, 125, pp. 279-291
  • Paegle, J., American low level jets in observation and theory: The All project (2000) Sixth International Conference on Southern Hemisphere Meteorology and Oceanography, pp. 161-162. , American Meteorological Society, Santiago de Chile
  • Prohaska, F.J., Climates of Central and South America (1976) World Survey of Climatology, pp. 57-69. , Schwerdtfeger W (ed) Elsevier, Amsterdam
  • Randel, D.L., Vonder Haar, T.H., Ringerud, M.A., Stephens, G.L., Greenwald, T.J., Combs, C.L., A new global water vapor dataset (1996) Bull Am Meteorol Soc, 77, pp. 1233-1246
  • Rao, V., Hada, K., Characteristics of rainfall over Brazil: Annual variations and connections with the Southern Oscillation (1990) Theor Appl Climatol, 42, pp. 81-90
  • Ropelewski, C.F., Halpert, M.S., Quantifying Southern Oscillation precipitation relationships (1996) J Clim, 9, pp. 1043-1059
  • Schmetz, J., Liu, Q., Outgoing longwave radiation and its diurnal variation at regional scales derived from Meteosat (1988) J Geophys Res, 11, pp. 192-203
  • Silva Diaz, P.L., The role of latent heat release in the dynamics of the LLJ's along the Andes (2000) Sixth International Conference on Southern Hemisphere Meteorology and Oceanography, pp. 163-165. , American Meteorological Society, Santiago de Chile
  • Sugahara, S., (1991) Fluctuacões interanuais, sazonais e intrasazonais da precipitaçāo no estado de Sao Paulo, , Tese de Doutorado, Departamento de Ciencias Atmosféricas, Universidade de Sao Paulo
  • Wang, M., Paegle, J., Impact of analysis uncertainty upon regional atmospheric moisture flux (1996) J Geophys Res, 101, pp. 7291-7303
  • Zhou, J., Lau, K.M., Climatology of the South American monsoon (1997) 5th International Conference on Southern Hemisphere Meteorology and Oceanography, pp. 160-161. , Pretoria, South Africa. American Meteorological society, Pretoria
  • Zhou, J., Lau, K.M., Does a monsoon climate exist over South America? (1998) J Clim, 11, pp. 1020-1040

Citas:

---------- APA ----------
González, M., Barros, V. & Doyle, M. (2002) . Relation between the onset and end of the South American summer monsoon and rainfall in subtropical South America. Climate Research, 21(2), 141-155.
http://dx.doi.org/10.3354/cr021141
---------- CHICAGO ----------
González, M., Barros, V., Doyle, M. "Relation between the onset and end of the South American summer monsoon and rainfall in subtropical South America" . Climate Research 21, no. 2 (2002) : 141-155.
http://dx.doi.org/10.3354/cr021141
---------- MLA ----------
González, M., Barros, V., Doyle, M. "Relation between the onset and end of the South American summer monsoon and rainfall in subtropical South America" . Climate Research, vol. 21, no. 2, 2002, pp. 141-155.
http://dx.doi.org/10.3354/cr021141
---------- VANCOUVER ----------
González, M., Barros, V., Doyle, M. Relation between the onset and end of the South American summer monsoon and rainfall in subtropical South America. Clim. Res. 2002;21(2):141-155.
http://dx.doi.org/10.3354/cr021141