MONTHLY EVOLUTION OF STREAMLEVEL OF THE XINGU RIVER IN ALTAMIRA-PA ASSOCIATED WITH THE EL NIÑO AND LA NIÑA EVENTS

Vânia dos Santos Franco, Everaldo de Souza, Amanda Pinheiro, Thaiane da Silva Dias, Franklin de Azevedo, Jaqueline do Carmo Santos

Abstract


http://dx.doi.org/10.5902/2179460X16223

This work presents a contribution to the Amazon hydroclimatology, in particular the monthly streamlevel variability of the Xingu river sub-basin in Altamira-PA (eastern Amazon) in association with ENSO episodes recorded in the last three decades (1979-2012). In climatological terms, the highest level regime of the Xingu river occurs during March to May (with a maximum peak of 682 cm in April) and the lowest level regime happens from August to October (with minimum peak of 260 cm in September). The results of the composites for years of occurrence of El Niño (La Niña) evidenced patterns of tropical convection anomalously weakened (intensified) within ITCZ and SACZ regions which consequently resulted in the occurrence of anomalies negative (positive) precipitation in most of the Amazon, thus explaining the hydrological regime predominantly below (above) average on the Xingu river in Altamira-PA.


Keywords


Hidroclimatologia da Amazônia, El Niño/La Niña, precipitação, ZCAS, ZCIT.



DOI: http://dx.doi.org/10.5902/2179460X16223

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Ciência e Natura

EISSN  2179-460X

ISSN 0100-8307

DOI 10.5902

 

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