Investigating links between rainfall variations in the Ogooué River basin and ENSO in the Pacific Ocean over the period 1940–1999
<p>This paper investigates links between rainfall variability in the Ogooué River Basin (ORB) and El Niño Southern Oscillation (ENSO) in the Pacific Ocean. Recent hydroclimatology studies of the ORB and surrounding areas resulting in contrasting conclusions about links between rainfall variabi...
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| Autores principales: | , , , , , , , , |
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| Formato: | article |
| Lenguaje: | EN |
| Publicado: |
Copernicus Publications
2021
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| Materias: | |
| Acceso en línea: | https://doaj.org/article/1ee65f560bd34766a6ac51068325c2b4 |
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| Sumario: | <p>This paper investigates links between rainfall variability in the
Ogooué River Basin (ORB) and El Niño Southern Oscillation (ENSO) in
the Pacific Ocean. Recent hydroclimatology studies of the ORB and
surrounding areas resulting in contrasting conclusions about links between
rainfall variability and ENSO. Thus, to make the issue clearer, this study
investigates the links between ENSO and rainfall in the ORB over the period
1940–1999. The principal component analysis of monthly rainfall in the ORB
was done. The temporal mode of the first component corresponds to the
interannual variations of rainfall on the ORB. Also, the pattern of the
spatial mode of the first component shows that the ORB is a homogeneous
hydroclimatic zone. However, no leading mode is significantly correlated to
the ENSO index. A cross-wavelet analysis of the time series of basin-scale
rainfall and the ENSO index was therefore carried out. The result is a set
of periodogram structures corresponding to some ENSO episodes recorded over
the study period. And wavelet coherence analysis of both time series
confirms that there are significant links between ENSO and rainfall in the
ORB.</p> |
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