FEATURING ENSO 1997-2000 IN CENTRAL CHILE
Using satellite images of the area between 32-36°S and 71-75°W, from October 1997 to September 1999, temporal and spatial variability of sea surface temperature (SST) was analyzed. During this period of time, one of the most intense episode of the last century of the warm phase (El Niño) and the beg...
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| Lenguaje: | English |
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Facultad de Ciencias Naturales y Oceanográficas, Universidad de Concepción
2004
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| Acceso en línea: | http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382004000200008 |
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oai:scielo:S0717-653820040002000082005-09-14FEATURING ENSO 1997-2000 IN CENTRAL CHILEBello,MónicaCastillo,ManuelMaturana,JennyValenzuela,ClaudiaBarbieri,M AngelaUsing satellite images of the area between 32-36°S and 71-75°W, from October 1997 to September 1999, temporal and spatial variability of sea surface temperature (SST) was analyzed. During this period of time, one of the most intense episode of the last century of the warm phase (El Niño) and the beginning of the cold phase (La Niña) of the ENSO cycle were registered, allowing to identify differences in the thermal surface structure. During the warm phase, cold water isotherms in the coastal region (upwelling) warmer than usual were presented, and temperature gradients offshore were smaller than in the cold phase. Several reports suggest that a large part of the Eastern Ocean Pacific Boundary variability (particularly at low frequencies) has equatorial origin. This research shows that part of the observed fluctuations in sea level at Callao, are due to intraseasonal oscillations likely modulated by perturbations of equatorial origin propagating as coastal trapped waves at the eastern boundary of the Pacific Ocean, having a signature in the currents off Valparaiso as a poleward flow, whose core exhibits higher salinity and low oxygen located at 180 m depth. On the other hand, geostrophic currents off Valparaiso consists of alongshore currents and countercurrents, with increasing speeds at fallinfo:eu-repo/semantics/openAccessFacultad de Ciencias Naturales y Oceanográficas, Universidad de ConcepciónGayana (Concepción) v.68 n.2 suppl.TIProc 20042004-01-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382004000200008en10.4067/S0717-65382004000200008 |
| institution |
Scielo Chile |
| collection |
Scielo Chile |
| language |
English |
| description |
Using satellite images of the area between 32-36°S and 71-75°W, from October 1997 to September 1999, temporal and spatial variability of sea surface temperature (SST) was analyzed. During this period of time, one of the most intense episode of the last century of the warm phase (El Niño) and the beginning of the cold phase (La Niña) of the ENSO cycle were registered, allowing to identify differences in the thermal surface structure. During the warm phase, cold water isotherms in the coastal region (upwelling) warmer than usual were presented, and temperature gradients offshore were smaller than in the cold phase. Several reports suggest that a large part of the Eastern Ocean Pacific Boundary variability (particularly at low frequencies) has equatorial origin. This research shows that part of the observed fluctuations in sea level at Callao, are due to intraseasonal oscillations likely modulated by perturbations of equatorial origin propagating as coastal trapped waves at the eastern boundary of the Pacific Ocean, having a signature in the currents off Valparaiso as a poleward flow, whose core exhibits higher salinity and low oxygen located at 180 m depth. On the other hand, geostrophic currents off Valparaiso consists of alongshore currents and countercurrents, with increasing speeds at fall |
| author |
Bello,Mónica Castillo,Manuel Maturana,Jenny Valenzuela,Claudia Barbieri,M Angela |
| spellingShingle |
Bello,Mónica Castillo,Manuel Maturana,Jenny Valenzuela,Claudia Barbieri,M Angela FEATURING ENSO 1997-2000 IN CENTRAL CHILE |
| author_facet |
Bello,Mónica Castillo,Manuel Maturana,Jenny Valenzuela,Claudia Barbieri,M Angela |
| author_sort |
Bello,Mónica |
| title |
FEATURING ENSO 1997-2000 IN CENTRAL CHILE |
| title_short |
FEATURING ENSO 1997-2000 IN CENTRAL CHILE |
| title_full |
FEATURING ENSO 1997-2000 IN CENTRAL CHILE |
| title_fullStr |
FEATURING ENSO 1997-2000 IN CENTRAL CHILE |
| title_full_unstemmed |
FEATURING ENSO 1997-2000 IN CENTRAL CHILE |
| title_sort |
featuring enso 1997-2000 in central chile |
| publisher |
Facultad de Ciencias Naturales y Oceanográficas, Universidad de Concepción |
| publishDate |
2004 |
| url |
http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382004000200008 |
| work_keys_str_mv |
AT bellomonica featuringenso19972000incentralchile AT castillomanuel featuringenso19972000incentralchile AT maturanajenny featuringenso19972000incentralchile AT valenzuelaclaudia featuringenso19972000incentralchile AT barbierimangela featuringenso19972000incentralchile |
| _version_ |
1718442058699505664 |