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The impact of the maximum convection location over eastern and centralEquatorial Pacific over the intensity and positioning of the South AmericanLow-Level Jet east of the Andes (SALLJ) during the austral summer wasinvestigated. The Bonner criteria 1 was applied to the NCEP-NCAR circulationfields during the El Ni\uf1o of 1997/1998 and 2002/2003 to identify theSALLJ episodes. The composites of the atmospheric circulation over the SouthAmerica during El Ni\uf1o events showed that the SALLJ can be influenced bysmall displacements of the quasi-stationary Rossby waves position. Duringthe strong El Ni\uf1o event of 1997/1998 the SALLJ is maintained by theeastern trade winds. A low-level anomalous anticyclonic circulation over thecentral part of Brazil enhanced the wind in the nucleus of the jet anddisplaced its axis to the Northern Argentina and South of Brazil. However,the northern trade winds seem to maintain the SALLJ during the weak ElNi\uf1o of 2002/2003. The jet was weaker and displaced more southeastwardof Brazil than during the strong event

Inter-El Niño variability and its impact on the South American low-level jet east of the Andes during austral summer − two case studies