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El Niño meets La Niña – anomalous rainfall patterns in the “traditional” El Niño region of southern Ecuador

Auteur(s) et Affiliation(s)

BENDIX, J.
Lab. for Climatology and Remote Sensing, Univ., Marburg, Allemagne
TRACHTE, K.
Lab. for Climatology and Remote Sensing, Univ., Marburg, Allemagne
PALACIOS, E.
Inst. Nacional de Meteorología e Hidrología, Quito, Equateur
Lab. for Climatology and Remote Sensing, Univ., Marburg, Allemagne
Lab. for Climatology and Remote Sensing, Univ., Marburg, Allemagne
NAUSS, T.
Fac. of Geography, Univ., Marburg, Allemagne
BENDIX, A.
Lab. for Climatology and Remote Sensing, Univ., Marburg, Allemagne


Description :
In this paper, the central Pacific cold event of 2008 and its exceptionally warm conditions in the eastern tropical Pacific are analyzed by using rainfall data of south Ecuadorian meteorological stations, sea surface temperatures in the El Niño3 and 1+2 regions, and simulations with the Weather Research and Forecasting (WRF) model. Since 2000, El Niño events unexpectedly provide below average rainfall while central Pacific La Niña conditions generate exceptional severe flooding in the normally drier coastal plains. The novel sea surface temperature (SST) anomaly dipole structure between the eastern and central/western tropical Pacific and the weakening of El Niño events since 2000 could be due to natural decadal oscillations in the El Niño background state, the Pacific Decadal Oscillation (PDO). However, the observed atmospheric patterns and the recent increase of the SST anomaly difference between the central and the eastern tropical Pacific resemble structures that also result from climate change simulations.


Type de document :
Article de périodique

Source :
Erdkunde, issn : 0014-0015, 2011, vol. 65, n°. 2, p. 151-167, nombre de pages : 17, Références bibliographiques : 3 p.

Date :
2011

Editeur :
Pays édition : Allemagne, Kleve, Boss

Langue :
Anglais
Droits :
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