Resumo

COMPAGNUCCI, Rosa H.  e  ARANEO, Diego C.. Identification of statistical homogeneous areas for argentinean andean river flows and their relationship with the atmospheric circulation and sea surface temperatures. Meteorologica [online]. 2005, vol.30, n.1-2, pp.41-53. ISSN 1850-468X.

The purpose of this paper is to locate the different regions in Los Andes mountain range on which the behavior of the flows of the involved rivers shows statistical homogeneities, studying also their entailment with sea surface temperature and atmospheric circulation. A corrected correlation linear index is defined and used as a distance measurement in a Principal Component Analysis. The first two Components identify two independent regions that explain the greater variability. These regions include: I) the area from the Neuquén River to the Senguer River and II) the area from the Jachal River to the Colorado River. Region I shows a double maximum regime of flow in winter-spring, whereas Region II is characterized by a maximum in summer. The last one would be closely related to the El Niño / Southern Oscillation patterns. The most relevant differences in the associated circulation to volume extremes of the Regions I and whit respect to the Region II would be: 1) the displacement of the circulation systems towards higher latitudes, 2) the greater relevance of the middle latitude systems, 3) the smaller importance of the systems located on the Drake Passage and 4) the presence at 500 hPa of a smaller longitude stationary waves train that crosses the continent at subtropical latitudes coming from the central Pacific in NW-SE direction.

Palavras-chave : Cuyo; Patagonia; Hydrology; Climate variability; ENOS; Atmospheric circulation.

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