Oceanographic and climatic variability in the lower gulf of california: links with the tropics and north pacific

Oceanographic and climatic variability in the lower gulf of california: links with the tropics and north pacific

The links between climate and oceanography in the lower Gulf of California (LGC) and the observed physical variability in the open Pacific were studied on interannual to decadal timescales. Two indices reflect the North Pacific´ s oceanic and climatic variability: the El Niño Southern Oscillation in...

Descripción completa

Guardado en:
Detalles Bibliográficos
Autores principales: Bernal, G, Ripa, P, Herguera, JC
Formato: Online
Lenguaje:eng
Publicado: Iniversidad Autónoma de Baja California 2001
Acceso en línea:https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/498
Etiquetas: Agregar Etiqueta
Sin Etiquetas, Sea el primero en etiquetar este registro!
id oai:cienciasmarinas.com.mx:article-498
record_format ojs
institution Ciencias Marinas
collection OJS
language eng
format Online
author Bernal, G
Ripa, P
Herguera, JC
spellingShingle Bernal, G
Ripa, P
Herguera, JC
Oceanographic and climatic variability in the lower gulf of california: links with the tropics and north pacific
author_facet Bernal, G
Ripa, P
Herguera, JC
author_sort Bernal, G
title Oceanographic and climatic variability in the lower gulf of california: links with the tropics and north pacific
title_short Oceanographic and climatic variability in the lower gulf of california: links with the tropics and north pacific
title_full Oceanographic and climatic variability in the lower gulf of california: links with the tropics and north pacific
title_fullStr Oceanographic and climatic variability in the lower gulf of california: links with the tropics and north pacific
title_full_unstemmed Oceanographic and climatic variability in the lower gulf of california: links with the tropics and north pacific
title_sort oceanographic and climatic variability in the lower gulf of california: links with the tropics and north pacific
description The links between climate and oceanography in the lower Gulf of California (LGC) and the observed physical variability in the open Pacific were studied on interannual to decadal timescales. Two indices reflect the North Pacific´ s oceanic and climatic variability: the El Niño Southern Oscillation index (ENSO) and the North Pacific Decadal Oscillation index (PDO). The sea surface temperatures, wind speed, precipitation and sea level records of La Paz region, Baja California Sur (Mexico) in the LGC were used to compare them with the PDO and ENSO indices. The most important forcing processes were observed coming from the tropical and the equatorial Pacific, represented by the ENSO index, significantly associated with precipitation, sea surface temperature (SST) and sea level. The Northern Pacific influence, represented by the PDO index, is associated with the winds and to a lesser extent with SSTs and precipitation. These results show that SST variability in the region is controlled by both indices. A model is proposed to explain the control that each of them exerts on the LGC SST variability. In this model the excess heat brought by surface tropical waters, especially after the intensification of ENSO events since the 1980s, in addition to the long term warming observed over the past century, is partially dissipated by stronger winter winds in the gulf. These stronger and cooler winds, derived from changes in the atmospheric circulation patterns of the North Pacific and captured by the PDO positive anomalies, act as negative feedback to the warming dissipating part of the accumulated heat and dampening the raise in SSTs. This process is proposed to operate, especially after the 1970s sign shift of the PDO, when no change in the SSTs´   trend occurs showing an opposite behavior in respect to wind variability, which was not observed for previous decades.
publisher Iniversidad Autónoma de Baja California
publishDate 2001
url https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/498
_version_ 1715723975574683648
spelling oai:cienciasmarinas.com.mx:article-4982019-05-03T22:27:31Z Oceanographic and climatic variability in the lower gulf of california: links with the tropics and north pacific Variabilidad ocanográfica y climática en el bajo Golfo de California: Influencias del trópico y Pacífico norte Bernal, G Ripa, P Herguera, JC ENSO PDO Gulf of California SST rainfall winds ENOA ODPN Golfo de California TSM precipitación vientos The links between climate and oceanography in the lower Gulf of California (LGC) and the observed physical variability in the open Pacific were studied on interannual to decadal timescales. Two indices reflect the North Pacific´ s oceanic and climatic variability: the El Niño Southern Oscillation index (ENSO) and the North Pacific Decadal Oscillation index (PDO). The sea surface temperatures, wind speed, precipitation and sea level records of La Paz region, Baja California Sur (Mexico) in the LGC were used to compare them with the PDO and ENSO indices. The most important forcing processes were observed coming from the tropical and the equatorial Pacific, represented by the ENSO index, significantly associated with precipitation, sea surface temperature (SST) and sea level. The Northern Pacific influence, represented by the PDO index, is associated with the winds and to a lesser extent with SSTs and precipitation. These results show that SST variability in the region is controlled by both indices. A model is proposed to explain the control that each of them exerts on the LGC SST variability. In this model the excess heat brought by surface tropical waters, especially after the intensification of ENSO events since the 1980s, in addition to the long term warming observed over the past century, is partially dissipated by stronger winter winds in the gulf. These stronger and cooler winds, derived from changes in the atmospheric circulation patterns of the North Pacific and captured by the PDO positive anomalies, act as negative feedback to the warming dissipating part of the accumulated heat and dampening the raise in SSTs. This process is proposed to operate, especially after the 1970s sign shift of the PDO, when no change in the SSTs´   trend occurs showing an opposite behavior in respect to wind variability, which was not observed for previous decades. Se exploraron las relaciones entre el clima y oceanografía del Bajo Golfo de California (BGC) y la variabilidad física observada en el Océano Pacífico a escalas de interanuales a decadales, la cual es recogida mayormente por dos índices: el índice de El Niño – Oscilación Austral (ENOA) y el índice de la Oscilación Interdecadal del Pacífico Norte (ODPN). Se compararon las series de tiempo de temperatura superficial del mar (TSM), rapidez de los vientos, precipitación pluvial y nivel del mar para la región de La Paz, Baja California Sur, México, en el BGC, con estos índices climáticos, encontrando que los forzamientos más importantes provienen del Pacífico tropical y ecuatorial, representados por el índice del ENOA y asociados significativamente con la precipitación, la TSM y el nivel del mar. La influencia del Pacífico Norte, representada por el índice de la ODPN, está asociada a los vientos y, en menor medida, a la TSM y la precipitación. Se encontró que la variabilidad de la TSM de la región está controlada por ambos índices. Se propone un modelo para explicar el control que cada uno de ellos ejerce sobre la variabilidad de la TSM en el BGC. En este modelo el exceso de calor aportado por aguas tropicales superficiales por la intensificación de los eventos de El Niño a partir de los años ochenta, junto con el calentamiento de las aguas observado a lo largo del siglo pasado, son disipados parcialmente por vientos invernales más fríos e intensos derivados de cambios en los patrones de circulación atmosférica del Pacífico Norte y capturados por las anomalías positivas de la ODPN. Se propone que este proceso controla la variabilidad oceanográfica especialmente a partir de la década de los años setenta cuando la TSM muestran un cambio en el signo de su respuesta a los vientos, fenómeno que no fue observado en décadas anteriores. Iniversidad Autónoma de Baja California 2001-03-06 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/498 10.7773/cm.v27i4.498 Ciencias Marinas; Vol. 27 No. 4 (2001); 595-617 Ciencias Marinas; Vol. 27 Núm. 4 (2001); 595-617 2395-9053 0185-3880 eng https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/498/436

Ejemplares similares