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:	S. Bogning, F. Frappart, G. Mahé, A. Paris, R. Onguene, F. Blarel, F. Niño, J. Etame, J.-J. Braun
Formato:	article
Lenguaje:	EN
Publicado:	Copernicus Publications 2021
Materias:	Environmental sciences GE1-350 Geology QE1-996.5
Acceso en línea:	https://doaj.org/article/1ee65f560bd34766a6ac51068325c2b4
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spelling	oai:doaj.org-article:1ee65f560bd34766a6ac51068325c2b42021-11-16T07:07:54ZInvestigating links between rainfall variations in the Ogooué River basin and ENSO in the Pacific Ocean over the period 1940–199910.5194/piahs-384-181-20212199-89812199-899Xhttps://doaj.org/article/1ee65f560bd34766a6ac51068325c2b42021-11-01T00:00:00Zhttps://piahs.copernicus.org/articles/384/181/2021/piahs-384-181-2021.pdfhttps://doaj.org/toc/2199-8981https://doaj.org/toc/2199-899X<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>S. BogningS. BogningF. FrappartG. MahéA. ParisR. OngueneF. BlarelF. NiñoJ. EtameJ.-J. BraunCopernicus PublicationsarticleEnvironmental sciencesGE1-350GeologyQE1-996.5ENProceedings of the International Association of Hydrological Sciences, Vol 384, Pp 181-186 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Environmental sciences GE1-350 Geology QE1-996.5
spellingShingle	Environmental sciences GE1-350 Geology QE1-996.5 S. Bogning S. Bogning F. Frappart G. Mahé A. Paris R. Onguene F. Blarel F. Niño J. Etame J.-J. Braun Investigating links between rainfall variations in the Ogooué River basin and ENSO in the Pacific Ocean over the period 1940–1999
description	<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>
format	article
author	S. Bogning S. Bogning F. Frappart G. Mahé A. Paris R. Onguene F. Blarel F. Niño J. Etame J.-J. Braun
author_facet	S. Bogning S. Bogning F. Frappart G. Mahé A. Paris R. Onguene F. Blarel F. Niño J. Etame J.-J. Braun
author_sort	S. Bogning
title	Investigating links between rainfall variations in the Ogooué River basin and ENSO in the Pacific Ocean over the period 1940–1999
title_short	Investigating links between rainfall variations in the Ogooué River basin and ENSO in the Pacific Ocean over the period 1940–1999
title_full	Investigating links between rainfall variations in the Ogooué River basin and ENSO in the Pacific Ocean over the period 1940–1999
title_fullStr	Investigating links between rainfall variations in the Ogooué River basin and ENSO in the Pacific Ocean over the period 1940–1999
title_full_unstemmed	Investigating links between rainfall variations in the Ogooué River basin and ENSO in the Pacific Ocean over the period 1940–1999
title_sort	investigating links between rainfall variations in the ogooué river basin and enso in the pacific ocean over the period 1940–1999
publisher	Copernicus Publications
publishDate	2021
url	https://doaj.org/article/1ee65f560bd34766a6ac51068325c2b4
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Investigating links between rainfall variations in the Ogooué River basin and ENSO in the Pacific Ocean over the period 1940–1999

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