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| Titel |
Inter-El Niño variability and its impact on the South American low-level jet east of the Andes during austral summer - two case studies |
| VerfasserIn |
G. A. M. Silva, T. Ambrizzi |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7340
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| Digitales Dokument |
URL |
| Erschienen |
In: 1st Alexander von Humboldt International Conference ; Nr. 6 (2006-03-08), S.283-287 |
| Datensatznummer |
250003270
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| Publikation (Nr.) |
 copernicus.org/adgeo-6-283-2006.pdf |
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| Zusammenfassung |
| The impact of the maximum convection location over eastern and central
Equatorial Pacific over the intensity and positioning of the South American
Low-Level Jet east of the Andes (SALLJ) during the austral summer was
investigated. The Bonner criteria 1 was applied to the NCEP-NCAR circulation
fields during the El Niño of 1997/1998 and 2002/2003 to identify the
SALLJ episodes. The composites of the atmospheric circulation over the South
America during El Niño events showed that the SALLJ can be influenced by
small displacements of the quasi-stationary Rossby waves position. During
the strong El Niño event of 1997/1998 the SALLJ is maintained by the
eastern trade winds. A low-level anomalous anticyclonic circulation over the
central part of Brazil enhanced the wind in the nucleus of the jet and
displaced its axis to the Northern Argentina and South of Brazil. However,
the northern trade winds seem to maintain the SALLJ during the weak El
Niño of 2002/2003. The jet was weaker and displaced more southeastward
of Brazil than during the strong event. |
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