Rainfall variability related to sea surface temperature anomalies in a Pacific-Andean basin into Ecuador and Peru

The spatiotemporal modes of seasonal rainfall variability and their relation with sea surface temperature anomalies (SSTA 1.2 indices) are examined in the transition from the coastal plain towards the western Andes cordillera in southern Ecuador/northwestern Peru using instrumental records (1970-200...

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Autores: Willems, P., Ntegeka, V., Pineda Ordoñez, L.
Formato: artículo
Estado:Versión publicada
Fecha de publicación:2013
País:Ecuador
Recursos:Universidad Técnica Particular de Loja
Repositorio:Repositorio Universidad Técnica Particular de Loja
OAI Identifier:oai:dspace.utpl.edu.ec:123456789/18931
Acesso em linha:http://dspace.utpl.edu.ec/handle/123456789/18931
Access Level:acceso abierto
Palavra-chave:atmospheric circulation
El Nino-Southern Oscillation
orographic effect
precipitation assessment
rainfall
sea surface temperature
temperature anomaly
Andes
Ecuador
Peru
Chira
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spelling Rainfall variability related to sea surface temperature anomalies in a Pacific-Andean basin into Ecuador and PeruWillems, P.Ntegeka, V.Pineda Ordoñez, L.atmospheric circulationEl Nino-Southern Oscillationorographic effectprecipitation assessmentrainfallsea surface temperaturetemperature anomalyAndesEcuadorPeruChiraThe spatiotemporal modes of seasonal rainfall variability and their relation with sea surface temperature anomalies (SSTA 1.2 indices) are examined in the transition from the coastal plain towards the western Andes cordillera in southern Ecuador/northwestern Peru using instrumental records (1970-2000) collected from the Catamayo-Chira basin. A multi-criteria data analysis is conducted within different elevation ranges. The criteria involve rotated principal components, cross correlations and temporal changes of anomalies in rainfall quantiles. The results confirm that SSTA 1.2 indices influence rainfall variability over the coastal plain (<510ma.s.l.) where forcing is dominant within December-May. The El Niño Southern Oscillation also plays a role inland of the coastal plain where a region of ENSO-like rainfall variability is found on the southeastern part of the basin (4�30'- 5� S/79�15'-80� W) within March-May (MAM). This suggests that inland distance and elevation are only partial controls of ocean-atmospheric forcing up to ~1300ma.s.l. Our analysis also provides evidence of the SSTA 1.2 indices influence in a large altitudinal range ~1400-2700ma.s.l. confined to the southeastern basin. This region is found consistently perturbed by ENSO within MAM. We conclude that geo-morphological features of the southwestern Ecuadorian Andean ridges play a twofold role in the control of ocean- atmospheric forcing. They can modulate the atmospheric circulation, leading to a dissipation of the signal, or they might favor meteorological processes, leading to enhancement of orographic precipitation. This would explain the observed ENSO signals in instrumental records at locations as high as 2700ma.s.l.Advances in Geosciences2017-06-16T22:02:38Z2017-06-16T22:02:38Z2013-04-0206/07/2015info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/article10.5194/adgeo-33-53-20131680734010.5194/adgeo-33-53-2013http://dspace.utpl.edu.ec/handle/123456789/18931Inglésinfo:eu-repo/semantics/openAccessreponame:Repositorio Universidad Técnica Particular de Lojainstname:Universidad Técnica Particular de Lojainstacron:UTPL2017-06-16T22:02:38Zoai:dspace.utpl.edu.ec:123456789/18931Institucionalhttps://dspace.utpl.edu.ec/Institución privadahttps://www.utpl.edu.ec/https://dspace.utpl.edu.ec/oai.Ecuador...opendoar:12272026-08-08T09:10:29.857510Repositorio Universidad Técnica Particular de Loja - Universidad Técnica Particular de Lojatrue
dc.title.none.fl_str_mv Rainfall variability related to sea surface temperature anomalies in a Pacific-Andean basin into Ecuador and Peru
title Rainfall variability related to sea surface temperature anomalies in a Pacific-Andean basin into Ecuador and Peru
spellingShingle Rainfall variability related to sea surface temperature anomalies in a Pacific-Andean basin into Ecuador and Peru
Willems, P.
atmospheric circulation
El Nino-Southern Oscillation
orographic effect
precipitation assessment
rainfall
sea surface temperature
temperature anomaly
Andes
Ecuador
Peru
Chira
title_short Rainfall variability related to sea surface temperature anomalies in a Pacific-Andean basin into Ecuador and Peru
title_full Rainfall variability related to sea surface temperature anomalies in a Pacific-Andean basin into Ecuador and Peru
title_fullStr Rainfall variability related to sea surface temperature anomalies in a Pacific-Andean basin into Ecuador and Peru
title_full_unstemmed Rainfall variability related to sea surface temperature anomalies in a Pacific-Andean basin into Ecuador and Peru
title_sort Rainfall variability related to sea surface temperature anomalies in a Pacific-Andean basin into Ecuador and Peru
dc.creator.none.fl_str_mv Willems, P.
Ntegeka, V.
Pineda Ordoñez, L.
author Willems, P.
author_facet Willems, P.
Ntegeka, V.
Pineda Ordoñez, L.
author_role author
author2 Ntegeka, V.
Pineda Ordoñez, L.
author2_role author
author
dc.subject.none.fl_str_mv atmospheric circulation
El Nino-Southern Oscillation
orographic effect
precipitation assessment
rainfall
sea surface temperature
temperature anomaly
Andes
Ecuador
Peru
Chira
topic atmospheric circulation
El Nino-Southern Oscillation
orographic effect
precipitation assessment
rainfall
sea surface temperature
temperature anomaly
Andes
Ecuador
Peru
Chira
description The spatiotemporal modes of seasonal rainfall variability and their relation with sea surface temperature anomalies (SSTA 1.2 indices) are examined in the transition from the coastal plain towards the western Andes cordillera in southern Ecuador/northwestern Peru using instrumental records (1970-2000) collected from the Catamayo-Chira basin. A multi-criteria data analysis is conducted within different elevation ranges. The criteria involve rotated principal components, cross correlations and temporal changes of anomalies in rainfall quantiles. The results confirm that SSTA 1.2 indices influence rainfall variability over the coastal plain (<510ma.s.l.) where forcing is dominant within December-May. The El Niño Southern Oscillation also plays a role inland of the coastal plain where a region of ENSO-like rainfall variability is found on the southeastern part of the basin (4�30'- 5� S/79�15'-80� W) within March-May (MAM). This suggests that inland distance and elevation are only partial controls of ocean-atmospheric forcing up to ~1300ma.s.l. Our analysis also provides evidence of the SSTA 1.2 indices influence in a large altitudinal range ~1400-2700ma.s.l. confined to the southeastern basin. This region is found consistently perturbed by ENSO within MAM. We conclude that geo-morphological features of the southwestern Ecuadorian Andean ridges play a twofold role in the control of ocean- atmospheric forcing. They can modulate the atmospheric circulation, leading to a dissipation of the signal, or they might favor meteorological processes, leading to enhancement of orographic precipitation. This would explain the observed ENSO signals in instrumental records at locations as high as 2700ma.s.l.
publishDate 2013
dc.date.none.fl_str_mv 06/07/2015
2013-04-02
2017-06-16T22:02:38Z
2017-06-16T22:02:38Z
dc.type.none.fl_str_mv info:eu-repo/semantics/publishedVersion
info:eu-repo/semantics/article
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv 10.5194/adgeo-33-53-2013
16807340
10.5194/adgeo-33-53-2013
http://dspace.utpl.edu.ec/handle/123456789/18931
identifier_str_mv 10.5194/adgeo-33-53-2013
16807340
url http://dspace.utpl.edu.ec/handle/123456789/18931
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.publisher.none.fl_str_mv Advances in Geosciences
publisher.none.fl_str_mv Advances in Geosciences
dc.source.none.fl_str_mv reponame:Repositorio Universidad Técnica Particular de Loja
instname:Universidad Técnica Particular de Loja
instacron:UTPL
instname_str Universidad Técnica Particular de Loja
instacron_str UTPL
institution UTPL
reponame_str Repositorio Universidad Técnica Particular de Loja
collection Repositorio Universidad Técnica Particular de Loja
repository.name.fl_str_mv Repositorio Universidad Técnica Particular de Loja - Universidad Técnica Particular de Loja
repository.mail.fl_str_mv .
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score 15,228081

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