Spatial structure of the temperature and salinity fields in the presence of internal waves on the continental shelf of the states of Jalisco and Colima (Mexico)

Spatial structure of the temperature and salinity fields in the presence of internal waves on the continental shelf of the states of Jalisco and Colima (Mexico)

A method to filter fluctuations in the hydrophysical properties of the continental shelf, caused by intense internal tides, is proposed. The method is based on a smoothing of the field of the properties analyzed with a filter, the parameters of which are determined by the shape of the spatial correl...

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第一著者: Filonov, AE
フォーマット: Online
言語:eng
出版事項: Iniversidad Autónoma de Baja California 2000
オンライン･アクセス:https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/574
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id oai:cienciasmarinas.com.mx:article-574
record_format ojs
institution Ciencias Marinas
collection OJS
language eng
format Online
author Filonov, AE
spellingShingle Filonov, AE
Spatial structure of the temperature and salinity fields in the presence of internal waves on the continental shelf of the states of Jalisco and Colima (Mexico)
author_facet Filonov, AE
author_sort Filonov, AE
title Spatial structure of the temperature and salinity fields in the presence of internal waves on the continental shelf of the states of Jalisco and Colima (Mexico)
title_short Spatial structure of the temperature and salinity fields in the presence of internal waves on the continental shelf of the states of Jalisco and Colima (Mexico)
title_full Spatial structure of the temperature and salinity fields in the presence of internal waves on the continental shelf of the states of Jalisco and Colima (Mexico)
title_fullStr Spatial structure of the temperature and salinity fields in the presence of internal waves on the continental shelf of the states of Jalisco and Colima (Mexico)
title_full_unstemmed Spatial structure of the temperature and salinity fields in the presence of internal waves on the continental shelf of the states of Jalisco and Colima (Mexico)
title_sort spatial structure of the temperature and salinity fields in the presence of internal waves on the continental shelf of the states of jalisco and colima (mexico)
description A method to filter fluctuations in the hydrophysical properties of the continental shelf, caused by intense internal tides, is proposed. The method is based on a smoothing of the field of the properties analyzed with a filter, the parameters of which are determined by the shape of the spatial correlation function of the field pulsations. The filtering method was tested on data from a fast oceanographic survey, conducted in an area of the monitoring polygon of the waters around Barra de Navidad. The survey was conducted on 25 and 26 November 1995, with an undulating CTD. In one day, 86 vertical profiles of temperature and salinity were obtained from nine transects perpendicular to the coast (survey area of 100 · 25 km) to a depth of 100 m. The filtering algorithm of the internal waves is studied in detail. The field measurements present an analytical shape obtained from an equation in which the elements describe the components: low frequency, pulsating and related to daily behavior. The results of the analysis of the initial temperature and salinity fields with respect to homogeneity and isotropy are discussed, as well as the structural peculiarities of the estimates of the spatial correlation functions. It is observed that the temperature and salinity fields along the shelf, within the limits of the polygon scale, are neither homogenous nor isotropic. The correlation functions of the field pulsations analyzed are more clearly observed in the thermocline. The characteristic scales perpendicular to the coast are smaller than along it. Examples of smoothing the temperature and salinity fields in the thermocline are given.
publisher Iniversidad Autónoma de Baja California
publishDate 2000
url https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/574
_version_ 1715723985072685056
spelling oai:cienciasmarinas.com.mx:article-5742019-05-09T18:40:43Z Spatial structure of the temperature and salinity fields in the presence of internal waves on the continental shelf of the states of Jalisco and Colima (Mexico) Estructura espacial de los campos de temperatura y salinidad en presencia de ondas internas en la plataforma continental de los estados de Jalisco y Colima (México) Filonov, AE continental shelf oceanographic survey internal waves filtering plataforma continental muestreo oceanográfico ondas internas filtración A method to filter fluctuations in the hydrophysical properties of the continental shelf, caused by intense internal tides, is proposed. The method is based on a smoothing of the field of the properties analyzed with a filter, the parameters of which are determined by the shape of the spatial correlation function of the field pulsations. The filtering method was tested on data from a fast oceanographic survey, conducted in an area of the monitoring polygon of the waters around Barra de Navidad. The survey was conducted on 25 and 26 November 1995, with an undulating CTD. In one day, 86 vertical profiles of temperature and salinity were obtained from nine transects perpendicular to the coast (survey area of 100 · 25 km) to a depth of 100 m. The filtering algorithm of the internal waves is studied in detail. The field measurements present an analytical shape obtained from an equation in which the elements describe the components: low frequency, pulsating and related to daily behavior. The results of the analysis of the initial temperature and salinity fields with respect to homogeneity and isotropy are discussed, as well as the structural peculiarities of the estimates of the spatial correlation functions. It is observed that the temperature and salinity fields along the shelf, within the limits of the polygon scale, are neither homogenous nor isotropic. The correlation functions of the field pulsations analyzed are more clearly observed in the thermocline. The characteristic scales perpendicular to the coast are smaller than along it. Examples of smoothing the temperature and salinity fields in the thermocline are given. Se propone un método de filtrado de las fluctuaciones de las características hidrofísicas en la plataforma continental que son causadas por intensas mareas internas. El método se fundamenta en el suavizado del campo de la característica analizada, a través de un filtro cuyos parámetros se determinan por la forma de la función de correlación espacial de las pulsaciones del campo. El método de filtrado se probó con los datos de un levantamiento oceanográfico rápido realizado en una zona del polígono de monitoreo de las aguas en la región de Barra de Navidad. El levantamiento se llevó a cabo el 25 y 26 de noviembre de 1995, con ayuda de un CTD ondulante. En tan solo un día se obtuvieron 86 perfiles verticales de la temperatura y salinidad en nueve transectos perpendiculares a la costa (área del levantamiento 100 · 25 km) hasta una profundidad de 100 m. Se revisa detalladamente el algoritmo de filtrado de las ondas internas. Las mediciones del campo se representan en forma analítica por medio de una ecuación cuyos miembros describen los componentes de baja frecuencia, de pulsación y el relacionado con el comportamiento diario. Se discuten los resultados del análisis de los campos iniciales de temperatura y de salinidad con respecto a la homogeneidad e isotropía, así como las peculiaridades de la estructura de las estimaciones de sus funciones de correlación espacial. Se muestra que el campo de temperatura y salinidad en la plataforma, en los límites de la escala del polígono, no son homogéneos ni isotrópicos. Las funciones de correlación de las pulsaciones de los campos analizados se representan más claramente en la capa de la termoclina. Sus escalas características son menores en la dirección perpendicular a la costa que a lo largo de ella. Se presentan y discuten ejemplos de suavización del campo de la temperatura y de la salinidad en 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/574 10.7773/cm.v26i1.574 Ciencias Marinas; Vol. 26 No. 1 (2000); 1-21 Ciencias Marinas; Vol. 26 Núm. 1 (2000); 1-21 2395-9053 0185-3880 eng https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/574/511

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