Oceanographic conditions west of the Baja California coast, 2002–2003: A weak El Niño and subarctic water enhancement

Oceanographic conditions west of the Baja California coast, 2002–2003: A weak El Niño and subarctic water enhancement

Oceanographic conditions in the Pacific waters off Baja California are described for the period 2002–2003. Anomalies in the temperature-salinity relationships were observed from October 2002 to April 2003, with a clear contribution of low salinity and low temperature subarctic water in the upper 100...

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Auteurs principaux: Durazo, R, Gaxiola-Castro, G, Lavaniegos, B, Castro-Valdez, R, Gómez-Valdés, J, Da-S-Mascarenhas-Jr, A
Format: Online
Langue:eng
Publié: Iniversidad Autónoma de Baja California 2005
Accès en ligne:https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/43
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spelling oai:cienciasmarinas.com.mx:article-432019-04-23T19:09:51Z Oceanographic conditions west of the Baja California coast, 2002–2003: A weak El Niño and subarctic water enhancement Condiciones oceanográficas frente a la costa occidental de Baja California, 2002–2003: Influencia de un El Niño débil y del incremento de agua subártica Durazo, R Gaxiola-Castro, G Lavaniegos, B Castro-Valdez, R Gómez-Valdés, J Da-S-Mascarenhas-Jr, A El Niño California Current System Baja California bio-physical coupling El Niño Sistema de la Corriente de California Baja California acoplamiento-biológico Oceanographic conditions in the Pacific waters off Baja California are described for the period 2002–2003. Anomalies in the temperature-salinity relationships were observed from October 2002 to April 2003, with a clear contribution of low salinity and low temperature subarctic water in the upper 100 m of the water column. Below 100 m, physical data suggested weak El Niño conditions. Weakened or poleward winds were not observed. The pelagic ecosystem during the intrusion of subarctic waters showed strong seasonal changes, with localized centers of high chlorophyll and zooplankton in July 2002, followed by a strong decrease in the following autumn and winter seasons. Both chlorophyll and zooplankton rebounded in April 2003, but zooplankton showed a stronger onshore-offshore gradient. There was no strong biological signal. The zooplankton taxa that showed an increase during El Niño 2002–2003 were salps and chaetognaths. The increase of salps did not appear to be related to this event, due to their seasonal occurrence limited to the northern region. In contrast the increase of chaetognaths presented a similar pattern to that observed in El Niño 1997–1998. En este trabajo se describen las condiciones oceanográficas del Océano Pacífico frente a Baja California durante el periodo 2002–2003. De octubre de 2002 a abril de 2003 se observaron relaciones anómalas entre la temperatura y la salinidad debidas a la fuerte presencia de agua de origen subártico, con baja salinidad y baja temperatura, en los 100 m superiores de la columna de agua. Por debajo de los 100 m de profundidad los datos físicos sugirieron condiciones que indican la presencia de un evento El Niño débil. Durante el periodo de estudio no se observó una disminución en los vientos dominantes o vientos con dirección hacia el polo. El ecosistema pelágico mostró fuertes cambios estacionales debidos a la intrusión de agua subártica, con zonas de alta clorofila y zooplancton en julio de 2002, con un fuerte decremento durante el otoño e invierno siguientes. Tanto la clorofila como el zooplancton resurgieron en abril de 2003, con un mayor gradiente costa-océano en el zooplancton. No se presentó una fuerte señal biológica durante el período. Los grupos de zooplancton que mostraron un incremento durante El Niño 2002–2003 fueron las salpas y los quetognatos. El incremento de salpas no parece estar asociado al evento, ya que su incidencia fue estacional y restringida a la región norte. En cambio el incremento en quetognatos presentó un patrón similar al de El Niño 1997–1998. Iniversidad Autónoma de Baja California 2005-03-06 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article Artículo Arbitrado application/pdf https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/43 10.7773/cm.v31i3.43 Ciencias Marinas; Vol. 31 No. 3 (2005); 537-552 Ciencias Marinas; Vol. 31 Núm. 3 (2005); 537-552 2395-9053 0185-3880 eng https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/43/25
institution Ciencias Marinas
collection OJS
language eng
format Online
author Durazo, R
Gaxiola-Castro, G
Lavaniegos, B
Castro-Valdez, R
Gómez-Valdés, J
Da-S-Mascarenhas-Jr, A
spellingShingle Durazo, R
Gaxiola-Castro, G
Lavaniegos, B
Castro-Valdez, R
Gómez-Valdés, J
Da-S-Mascarenhas-Jr, A
Oceanographic conditions west of the Baja California coast, 2002–2003: A weak El Niño and subarctic water enhancement
author_facet Durazo, R
Gaxiola-Castro, G
Lavaniegos, B
Castro-Valdez, R
Gómez-Valdés, J
Da-S-Mascarenhas-Jr, A
author_sort Durazo, R
title Oceanographic conditions west of the Baja California coast, 2002–2003: A weak El Niño and subarctic water enhancement
title_short Oceanographic conditions west of the Baja California coast, 2002–2003: A weak El Niño and subarctic water enhancement
title_full Oceanographic conditions west of the Baja California coast, 2002–2003: A weak El Niño and subarctic water enhancement
title_fullStr Oceanographic conditions west of the Baja California coast, 2002–2003: A weak El Niño and subarctic water enhancement
title_full_unstemmed Oceanographic conditions west of the Baja California coast, 2002–2003: A weak El Niño and subarctic water enhancement
title_sort oceanographic conditions west of the baja california coast, 2002–2003: a weak el niño and subarctic water enhancement
description Oceanographic conditions in the Pacific waters off Baja California are described for the period 2002–2003. Anomalies in the temperature-salinity relationships were observed from October 2002 to April 2003, with a clear contribution of low salinity and low temperature subarctic water in the upper 100 m of the water column. Below 100 m, physical data suggested weak El Niño conditions. Weakened or poleward winds were not observed. The pelagic ecosystem during the intrusion of subarctic waters showed strong seasonal changes, with localized centers of high chlorophyll and zooplankton in July 2002, followed by a strong decrease in the following autumn and winter seasons. Both chlorophyll and zooplankton rebounded in April 2003, but zooplankton showed a stronger onshore-offshore gradient. There was no strong biological signal. The zooplankton taxa that showed an increase during El Niño 2002–2003 were salps and chaetognaths. The increase of salps did not appear to be related to this event, due to their seasonal occurrence limited to the northern region. In contrast the increase of chaetognaths presented a similar pattern to that observed in El Niño 1997–1998.
publisher Iniversidad Autónoma de Baja California
publishDate 2005
url https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/43
_version_ 1715723927711383552

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