Wind relaxation and poleward flow events in the upwelling region off Baja California, Mexico

Wind relaxation and poleward flow events in the upwelling region off Baja California, Mexico

Wind relaxation events are commonly observed in eastern boundary upwelling ecosystems. The wind fields over the southern part of the California Current System were separated into upwelling-favorable winds and wind relaxations by using a technique based on complex correlation analysis. Using vessel-m...

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Những tác giả chính: Vazquez, Heriberto J, Gomez-Valdes, Jose
Định dạng: Online
Ngôn ngữ:eng
Được phát hành: Iniversidad Autónoma de Baja California 2018
Truy cập trực tuyến:https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/2745
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id oai:cienciasmarinas.com.mx:article-2745
record_format ojs
institution Ciencias Marinas
collection OJS
language eng
format Online
author Vazquez, Heriberto J
Gomez-Valdes, Jose
spellingShingle Vazquez, Heriberto J
Gomez-Valdes, Jose
Wind relaxation and poleward flow events in the upwelling region off Baja California, Mexico
author_facet Vazquez, Heriberto J
Gomez-Valdes, Jose
author_sort Vazquez, Heriberto J
title Wind relaxation and poleward flow events in the upwelling region off Baja California, Mexico
title_short Wind relaxation and poleward flow events in the upwelling region off Baja California, Mexico
title_full Wind relaxation and poleward flow events in the upwelling region off Baja California, Mexico
title_fullStr Wind relaxation and poleward flow events in the upwelling region off Baja California, Mexico
title_full_unstemmed Wind relaxation and poleward flow events in the upwelling region off Baja California, Mexico
title_sort wind relaxation and poleward flow events in the upwelling region off baja california, mexico
description Wind relaxation events are commonly observed in eastern boundary upwelling ecosystems. The wind fields over the southern part of the California Current System were separated into upwelling-favorable winds and wind relaxations by using a technique based on complex correlation analysis. Using vessel-mounted Acoustic Doppler Current Profiler and conductivity-temperature-depth observations from 4 consecutive Mexican Investigations of the California Current (IMECOCAL) cruises carried out during 2001–2002, a description of the ocean state associated with these stages of the wind field was elaborated for the northern Baja California (Mexico) upwelling region. Relaxation events occurred during each cruise. A coastal poleward flow event was conspicuous when a relaxation event followed a long upwelling favorable wind event. This pattern was also correlated with a negative or close to zero wind curl at the coast. A coastal equatorial jet and an upper-ocean offshore poleward flow were observed during spring, representing a typical upwelling pattern that is correlated with a large positive wind stress curl near the coast. In winter, a surface poleward flow was inhibited by a strong northwest wind event, which generated a shallow equatorward flow. The circulation patterns described here are consistent with theories that explain surface poleward flows through wind relaxation and negative wind curl. Key words: winds, upwelling regions, poleward flows, wind relaxation events, IMECOCAL.
publisher Iniversidad Autónoma de Baja California
publishDate 2018
url https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/2745
_version_ 1792606973216161792
spelling oai:cienciasmarinas.com.mx:article-27452024-03-02T23:30:54Z Wind relaxation and poleward flow events in the upwelling region off Baja California, Mexico Relajación del viento y flujos hacia el polo en la región de surgencias frente a Baja California, México Vazquez, Heriberto J Gomez-Valdes, Jose Wind relaxation events are commonly observed in eastern boundary upwelling ecosystems. The wind fields over the southern part of the California Current System were separated into upwelling-favorable winds and wind relaxations by using a technique based on complex correlation analysis. Using vessel-mounted Acoustic Doppler Current Profiler and conductivity-temperature-depth observations from 4 consecutive Mexican Investigations of the California Current (IMECOCAL) cruises carried out during 2001–2002, a description of the ocean state associated with these stages of the wind field was elaborated for the northern Baja California (Mexico) upwelling region. Relaxation events occurred during each cruise. A coastal poleward flow event was conspicuous when a relaxation event followed a long upwelling favorable wind event. This pattern was also correlated with a negative or close to zero wind curl at the coast. A coastal equatorial jet and an upper-ocean offshore poleward flow were observed during spring, representing a typical upwelling pattern that is correlated with a large positive wind stress curl near the coast. In winter, a surface poleward flow was inhibited by a strong northwest wind event, which generated a shallow equatorward flow. The circulation patterns described here are consistent with theories that explain surface poleward flows through wind relaxation and negative wind curl. Key words: winds, upwelling regions, poleward flows, wind relaxation events, IMECOCAL. Los eventos de relajación suelen observarse de manera común en los ecosistemas de surgencia de las corrientes limítrofes orientales. Los campos de viento sobre la región sur del Sistema de la Corriente de California fueron separados en vientos favorables para las surgencias y eventos de relajación por medio de una técnica basada en un análisis de correlación compleja. Se usaron los datos de un perfilador de corrientes Doppler montado en barco y las mediciones de conductividad, temperatura y profundidad de 4 cruceros consecutivos del programa Investigaciones Mexicanas de la Corriente de California (IMECOCAL) llevados a cabo entre 2001 y 2002 para describir el estado del océano con relación a esos tipos de viento en la región de surgencias de Baja California, México. Sucedieron eventos de relajación durante cada uno de los cruceros. Un flujo costero hacia el polo fue una característica persistente en el sistema cuando los eventos de relajación precedían a los eventos de vientos favorables para las surgencias de larga duración. Este flujo costero también estuvo correlacionado con un rotacional del esfuerzo del viento negativo o cercano a cero en la región costera. Un chorro costero hacia el ecuador y un flujo superficial fuera de la costa hacia el polo fueron observados en primavera, lo cual es un típico patrón de surgencias que esta correlacionado con un rotacional del esfuerzo del viento grande y positivo cerca de la costa. En invierno, un flujo superficial hacia el polo fue inhibido por fuertes vientos del noroeste, lo que generó un flujo superficial hacia el ecuador. Los patrones de circulación encontrados son consistentes con las teorías que explican los flujos superficiales hacia el polo a través de eventos de relajación y rotacional del viento negativo. Palabras clave: vientos, regiones de surgencias, flujos hacia el polo, relajación del viento, IMECOCAL. Iniversidad Autónoma de Baja California 2018-06-25 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article Artículo Arbitrado application/pdf text/xml text/xml https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/2745 10.7773/cm.v44i2.2745 Ciencias Marinas; Vol. 44 No. 2 (2018); 59–70 Ciencias Marinas; Vol. 44 Núm. 2 (2018); 59–70 2395-9053 0185-3880 eng https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/2745/420420440 https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/2745/420421003 https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/2745/420420617 Copyright (c) 2018 Ciencias Marinas https://creativecommons.org/licenses/by/4.0

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