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This note describes the physical processes associated with the occurrence of a heat wave over central Argentina during the austral summer of 2002/03, during which the South American Low-Level Jet Experiment (SALLJEX) was carried out. The SALLJEX heat wave that lasted between 25 January and 2 February 2003 was punctuated by extreme conditions during its last 3 days, with the highest temperature recorded over the last 35 yr at several stations of the region. It was found that not only the activity of synoptic-scale waves, but also the intraseasonal oscillation variability, had a strong impact on the temperature evolution during this summer. During the weeks previous to the heat wave development, an intensified South Atlantic convergence zone (SACZ) dominated the atmospheric conditions over tropical South America. Temperatures started to increase in the subtropics due to the subsidence and diabatic warming associated with the SACZ, as depicted by SALLJEX upper-air observations. An extratropical anticyclone that evolved along southern South America further intensified subsidence conditions. By the end of January the warming processes associated with SACZ activity weakened, while horizontal temperature advection began to dominate over central Argentina due to the intensification of the South American low-level jet. This mechanism led to temperature extremes by 2 February with temperature anomalies at least two standard deviations larger than the climatological mean values. Intense solar heating favored by strong subsidence was responsible for the heat wave until 31 January, after which horizontal temperature advection was the primary process associated with the temperature peak. © 2007 American Meteorological Society.


Documento: Artículo
Título:The nature of a heat wave in eastern Argentina occuring during SALLJEX
Autor:Cerne, S.B.; Vera, C.S.; Liebmann, B.
Filiación:Centro de Investigaciones del Mar y la Atmósfera, CONICET, Universidad de Buenos Aires, 2do piso, Pab. II, 1428 Buenos Aires, Argentina
CIRES, Climate Diagnostics Center, Boulder, CO, United States
Palabras clave:Atmospheric movements; Atmospheric temperature; Climate change; Statistics; Tropics; Weather forecasting; Heat wave; Intraseasonal oscillation variability; Standard deviations; Synoptic scale view; Climatology; advection; air temperature; anticyclone; summer; warming; Argentina; South America
Página de inicio:1165
Página de fin:1174
Título revista:Monthly Weather Review
Título revista abreviado:Mon. Weather Rev.


  • Alessandro, A.P., de Garín, A.B., A study on predictability of human physiological strain in Buenos Aires City (2003) Meteor. Appl., 10, pp. 263-271
  • Campetella, C., Rusticucci, M., Synoptic analysis of an extreme heat wave over Argentina in March 1980 (1998) Meteor. Appl., 5, pp. 217-226
  • Cerne, S.B., Possia, N.E., Evolution of South American high pressure systems during late summer 1997 (2004) Meteor. Appl., 11, pp. 329-341
  • Gandu, A.W., Silva Dias, P.L., Impact of tropical heat sources on the South American tropospheric upper circulation and subsidence (1998) J. Geophys. Res., 103, pp. 6001-6015
  • Garreaud, R.D., Wallace, J.M., Summertime incursions of midlatitude air into subtropical and tropical South America (1998) Mon. Wea. Rev., 126, pp. 2713-2733
  • Kalnay, E., The NCEP/NCAR 40-Year Reanalysis Project (1996) Bull. Amer. Meteor. Soc., 77, pp. 437-471. , Coauthors
  • Lee, D., Henschel, A., Effects of physiological and clinical factors on the response to heat (1966) Ann. N. Y. Acad. Sci., 134, pp. 734-749
  • Liebmann, B., Kiladis, G.N., Marengo, J.A., Ambrizzi, T., Glick, J.D., Submonthy convective variability over South America and the South Atlantic convergence zone (1999) J. Climate, 12, pp. 1877-1891
  • Liebmann, B., Kiladis, N., Vera, C.S., Saulo, A.C., Carvalho, L.M.V., Subseasonal variations of rainfall in South America in the vicinity of the low-level jet east of the Andes and comparison to those in the South Atlantic convergence zone (2004) J. Climate, 17, pp. 3829-3842
  • Nogues-Paegle, J., Mo, K., Alternating wet and dry conditions over South America during summer (1997) Mon. Wea. Rev., 125, pp. 279-291
  • Rusticucci, M., Regional variability of 6-hourly and daily surface temperatures over Argentina (1995), p. 144. , Ph.D. thesis, University of Buenos Aires, [Available from Departamento de Ciencias de la Atmósfera y los Océanos, Fac. de Ciencias Exactas y Naturales, Ciudad Universitaria, 1428, Ciudad de Buenos Aires, Argentina.]; Rusticucci, M., Vargas, W., Synoptic situations related to spells of extreme temperatures over Argentina (1995) Meteor. Appl., 2, pp. 291-300
  • Rusticucci, M., Kousky, V., A comparative study of maximum and minimum temperatures over Argentina: NCEP-NCAR reanalysis versus station data (2002) J. Climate, 15, pp. 2089-2101
  • Saulo, C., Seluchi, M.E., Nicolini, M., A case study of a Chaco low-level jet event (2004) Mon. Wea. Rev., 132, pp. 2669-2683
  • Seluchi, M., Saulo, A.C., Nicolini, M., Satyamurty, P., The northwestern Argentinean low: A study of two typical events (2003) Mon. Wea. Rev., 131, pp. 2361-2378
  • Vera, C., The South American Low-Level Jet Experiment (2006) Bull. Amer. Meteor. Soc., 87, pp. 63-77. , Coauthors


---------- APA ----------
Cerne, S.B., Vera, C.S. & Liebmann, B. (2007) . The nature of a heat wave in eastern Argentina occuring during SALLJEX. Monthly Weather Review, 135(3), 1165-1174.
---------- CHICAGO ----------
Cerne, S.B., Vera, C.S., Liebmann, B. "The nature of a heat wave in eastern Argentina occuring during SALLJEX" . Monthly Weather Review 135, no. 3 (2007) : 1165-1174.
---------- MLA ----------
Cerne, S.B., Vera, C.S., Liebmann, B. "The nature of a heat wave in eastern Argentina occuring during SALLJEX" . Monthly Weather Review, vol. 135, no. 3, 2007, pp. 1165-1174.
---------- VANCOUVER ----------
Cerne, S.B., Vera, C.S., Liebmann, B. The nature of a heat wave in eastern Argentina occuring during SALLJEX. Mon. Weather Rev. 2007;135(3):1165-1174.