Seasonal variation of the temperature and salinity at the entrance to the gulf of california, mexico

Seasonal variation of the temperature and salinity at the entrance to the gulf of california, mexico

Seasonal variability at the entrance to the Gulf of California is described using high resolution CTD data from a section across the entrance to the gulf that was occupied eight times between 1992 and 1998. Variability decreased rapidly below 100 dbar, so that standard deviations exceeding 0.5ºC and...

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Autores principales: Castro, R, Mascarenhas, AS, Durazo, R, Collins, CA
Formato: Online
Lenguaje:eng
Publicado: Iniversidad Autónoma de Baja California 2000
Acceso en línea:https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/621
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id oai:cienciasmarinas.com.mx:article-621
record_format ojs
institution Ciencias Marinas
collection OJS
language eng
format Online
author Castro, R
Mascarenhas, AS
Durazo, R
Collins, CA
spellingShingle Castro, R
Mascarenhas, AS
Durazo, R
Collins, CA
Seasonal variation of the temperature and salinity at the entrance to the gulf of california, mexico
author_facet Castro, R
Mascarenhas, AS
Durazo, R
Collins, CA
author_sort Castro, R
title Seasonal variation of the temperature and salinity at the entrance to the gulf of california, mexico
title_short Seasonal variation of the temperature and salinity at the entrance to the gulf of california, mexico
title_full Seasonal variation of the temperature and salinity at the entrance to the gulf of california, mexico
title_fullStr Seasonal variation of the temperature and salinity at the entrance to the gulf of california, mexico
title_full_unstemmed Seasonal variation of the temperature and salinity at the entrance to the gulf of california, mexico
title_sort seasonal variation of the temperature and salinity at the entrance to the gulf of california, mexico
description Seasonal variability at the entrance to the Gulf of California is described using high resolution CTD data from a section across the entrance to the gulf that was occupied eight times between 1992 and 1998. Variability decreased rapidly below 100 dbar, so that standard deviations exceeding 0.5ºC and 0.05 for temperature and salinity, respectively, were confined to the upper 150 dbar. The mean salinity field wasasymmetric, with fresher waters (S < 34.6) between 25 and 75 dbar next to Sinaloa and saltier waters (S > 34.8) above 50 dbar and between 100 and 150 dbar near Baja California. A seasonal thermocline developed in the upper 50 dbar, increasing from 21ºC in February surface temperatures to 31ºC in August. Below 100 dbar, temperature at a given pressure was typically colder in the center of the section, indicating cyclonic flow (flow into the gulf next to Sinaloa and out of the gulf next to Baja California). The subsurface mid-gulf cooling (cyclonic flow) was strongest during winter and spring when the exchange of heat between the gulf and the Pacific Ocean is large. Subsurface mid-gulf heating (corresponding to anticyclonic flow) was not observed. Temporal and spatial distribution of saline water masses suggests that heat exchanges take place by alternating the inflow and outflow of warm (surface) and cold (subsurface) water masses. The 1997–1998 El Niño resulted in a 50 dbar deepening of the thermocline in November 1997, as well as a freshening of 0.1 to 0.2 of waters above the thermocline.
publisher Iniversidad Autónoma de Baja California
publishDate 2000
url https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/621
_version_ 1715723990905913344
spelling oai:cienciasmarinas.com.mx:article-6212019-05-02T23:41:35Z Seasonal variation of the temperature and salinity at the entrance to the gulf of california, mexico Variación estacional de la temperatura y salinidad en la entrada del golfo de California, México Castro, R Mascarenhas, AS Durazo, R Collins, CA Gulf of California seasonal variation thermohaline properties El Niño Golfo de California variación estacional propiedades termohalinas El Niño Seasonal variability at the entrance to the Gulf of California is described using high resolution CTD data from a section across the entrance to the gulf that was occupied eight times between 1992 and 1998. Variability decreased rapidly below 100 dbar, so that standard deviations exceeding 0.5ºC and 0.05 for temperature and salinity, respectively, were confined to the upper 150 dbar. The mean salinity field wasasymmetric, with fresher waters (S < 34.6) between 25 and 75 dbar next to Sinaloa and saltier waters (S > 34.8) above 50 dbar and between 100 and 150 dbar near Baja California. A seasonal thermocline developed in the upper 50 dbar, increasing from 21ºC in February surface temperatures to 31ºC in August. Below 100 dbar, temperature at a given pressure was typically colder in the center of the section, indicating cyclonic flow (flow into the gulf next to Sinaloa and out of the gulf next to Baja California). The subsurface mid-gulf cooling (cyclonic flow) was strongest during winter and spring when the exchange of heat between the gulf and the Pacific Ocean is large. Subsurface mid-gulf heating (corresponding to anticyclonic flow) was not observed. Temporal and spatial distribution of saline water masses suggests that heat exchanges take place by alternating the inflow and outflow of warm (surface) and cold (subsurface) water masses. The 1997–1998 El Niño resulted in a 50 dbar deepening of the thermocline in November 1997, as well as a freshening of 0.1 to 0.2 of waters above the thermocline. Se describe la variabilidad estacional en la entrada al Golfo de California utilizando datos de CTD en una sección a través de la entrada al golfo, la cual fue ocupada en ocho ocasiones entre 1992 y 1998. Se encontró que la variabilidad decrece rápidamente debajo de los 100 dbar; las desviaciones estándar mayores que 0.5ºC y 0.05 para temperatura y salinidad, respectivamente, fueron confinadas a la capa superior de 150 dbar. El campo medio de salinidad fue asimétrico, con aguas de menor salinidad (S <34.6) entre 25 y 75 dbar cerca de Sinaloa y aguas de mayor salinidad (S > 34.8) arriba de 50 dbar y entre 100 y 150 dbar cerca de Baja California. En la capa superior de 50 dbar se observó una termoclina estacional sobre la cual las temperaturas superficiales cambiaron de 21ºC en febrero a 31ºC en agosto. Debajo de los 100 dbar, la temperatura a una presión dada fue típicamente más fría en el centro de la sección, indicando flujo ciclónico (flujo de entrada al golfo cerca de Sinaloa y de salida del golfo cerca de Baja California). El enfriamiento subsuperficial en la mitad de la sección del golfo (flujo ciclónico) fue más fuerte durante el invierno y la primavera, época cuando el intercambio de calor entre el golfo y el Océano Pacífico es mayor. No se observó el calentamiento subsuperficial en la parte media de la sección que corresponde a un flujo anticiclónico. La distribución temporal y espacial de las masas de agua de mayor salinidad sugieren que los intercambios de calor se dan por la alternancia de flujos de entrada y salida de masas de agua de mayor temperatura (superficial) y menor temperatura (subsuperficial). Durante el evento de El Niño 1997–1998 se observó un hundimiento de 50 dbar en la termoclina en noviembre de 1997, así como una disminución de 0.1 a 0.2 de la salinidad de las aguas arriba de la termoclina. Iniversidad Autónoma de Baja California 2000-03-06 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/621 10.7773/cm.v26i4.621 Ciencias Marinas; Vol. 26 No. 4 (2000); 561-583 Ciencias Marinas; Vol. 26 Núm. 4 (2000); 561-583 2395-9053 0185-3880 eng https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/621/557

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