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Impact de la variabilité climatique sur l'hydrologie du bassin amazonien

Abstract : The Amazon basin hydroclimatic variability is studied during the forty last years using for the first time in situ rainfall and discharge data from five countries. A low-stage diminution and lasting strong high-stage values in the main stream of the Amazon are particularly important since the beginning of the nineties; they are associated with annual rainfall and discharge reductions in the southwestern sub-basins and with increasing rainfall and high-stage discharge in the north-west, that is to say in Andean sub-basins. Oceano-atmospheric indices and weather regimes over tropical South America are used to explain the hydrological variability. Weather regimes are defined using ERA40 reanalysis data and a neuronal method. They are related to the progression toward East of extra-tropical perturbations which modify the meridian winds East of the Andes and cause alternating convergence and divergence in the southwestern and northwestern Amazon.
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Contributor : Jhan Carlo Espinoza <>
Submitted on : Monday, April 27, 2009 - 4:25:32 PM
Last modification on : Wednesday, January 13, 2021 - 11:12:04 AM
Long-term archiving on: : Thursday, June 10, 2010 - 10:01:33 PM


  • HAL Id : tel-00379116, version 1


Jhan Carlo Espinoza. Impact de la variabilité climatique sur l'hydrologie du bassin amazonien. Hydrologie. Université Pierre et Marie Curie - Paris VI, 2009. Français. ⟨tel-00379116⟩



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