Diurnal frequency internal waves in the southern part of the California Current ecosystem as a nutrient source

Although the semidiurnal internal tide dominates internal motions at all sites studied to date off Mexico, a diurnal signal was detected on the shelf of the California Current System off Baja California Sur, even though the barotropic tide is exponentially stronger in the semidiurnal frequency along...

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Autores principales:	Ladah, Lydia Betty, Leichter, James J, Filonov, Anatoliy, Tereshchenko, Iryna
Formáid:	info:eu-repo/semantics/article
Teanga:	eng
Foilsithe:	Iniversidad Autónoma de Baja California 2017
Rochtain Ar Líne:	https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/2785
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id	repositorioinstitucional-20.500.12930-7535
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spelling	repositorioinstitucional-20.500.12930-75352023-05-09T14:30:59Z Diurnal frequency internal waves in the southern part of the California Current ecosystem as a nutrient source Ondas internas diurnas en la parte sur del ecosistema de la corriente de California como fuente de nutrientes Ladah, Lydia Betty Leichter, James J Filonov, Anatoliy Tereshchenko, Iryna Although the semidiurnal internal tide dominates internal motions at all sites studied to date off Mexico, a diurnal signal was detected on the shelf of the California Current System off Baja California Sur, even though the barotropic tide is exponentially stronger in the semidiurnal frequency along this coastline. In this study, diurnal thermocline shoaling events were measured in kelp beds in late summer and fall of 2004, very near their southern limit in the Northern Hemisphere. Sub-thermocline water bathed the base of the kelp beds at a diurnal frequency. Nitrate concentrations up to 1.4 µmol·L–1 were found in this sub-thermocline water of almost 20 ºC entering the kelp beds, which is a much greater concentration of nitrate at this temperature than is typical for the California Current. Nitrate-rich pulses lasted from 35 min to 19 h and reduced bottom temperatures up to 5 ºC in 1 h. The periodicity of temperature variability at the moorings showed significant coherence with the diurnal variability in zonal winds (>95% confidence interval) and was not coherent with the semidiurnal tide. We propose that windforced, diurnal internal motions may provide an important nutrient source for primary producers during reduced upwelling periods and merit further study as a fertilization source in the southern part of the California Current System.  A pesar de que la marea semidiurna predomina en las ondas internas de casi todos los sitios estudiados hasta la fecha en México, se detectó una marea interna diurna sobre la plataforma continental del Sistema de la Corriente de California frente a las costas de Baja California Sur, aunque la marea barotrópica es exponencialmente más fuerte en la frecuencia semidiurna. En este estudio, se midió la subida diurna de la termoclina en los mantos de kelp, localizados cerca del límite sureño de su distribución en el hemisferio norte, durante el verano y el otoño de 2004. Agua profunda cubrió la base de los mantos de kelp una vez al día donde se encontraron concentraciones de nitrato de hasta 1.4 µmol·L–1 en agua de casi 20 ºC, lo cual representa una concentración elevada de nitrato a esa temperatura para la corriente de California. Los pulsos de agua rica en nitrato duraron de 35 min a 19 h en los mantos y redujeron la temperatura del fondo hasta 5 ºC en 1 h. La periodicidad de la variabilidad de la temperatura mostró una coherencia significativa con la variabilidad diurna de los vientos zonales (>95% intervalo de confianza) y no fue coherente con la marea semidiurna. Proponemos que las ondas internas diurnas, forzadas por el viento, podrían proveer una fuente importante de nutrientes a los productores primarios durante periodos en los cuales la actividad de surgencias es reducida y requieren de más estudio para evaluar su capacidad de actuar como una fuente de fertilización en la parte sur del Sistema de la Corriente de California. 2017-12-22 2021-06-03T03:55:36Z 2021-06-03T03:55:36Z info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article Artículo Arbitrado https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/2785 10.7773/cm.v43i4.2785 https://hdl.handle.net/20.500.12930/7535 eng https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/2785/1940 Copyright (c) 2017 Ciencias Marinas application/pdf Iniversidad Autónoma de Baja California Ciencias Marinas; Vol. 43 No. 4 (2017); 203–215 Ciencias Marinas; Vol. 43 Núm. 4 (2017); 203–215 2395-9053 0185-3880
institution	Repositorio Institucional
collection	DSpace
language	eng
description	Although the semidiurnal internal tide dominates internal motions at all sites studied to date off Mexico, a diurnal signal was detected on the shelf of the California Current System off Baja California Sur, even though the barotropic tide is exponentially stronger in the semidiurnal frequency along this coastline. In this study, diurnal thermocline shoaling events were measured in kelp beds in late summer and fall of 2004, very near their southern limit in the Northern Hemisphere. Sub-thermocline water bathed the base of the kelp beds at a diurnal frequency. Nitrate concentrations up to 1.4 µmol·L–1 were found in this sub-thermocline water of almost 20 ºC entering the kelp beds, which is a much greater concentration of nitrate at this temperature than is typical for the California Current. Nitrate-rich pulses lasted from 35 min to 19 h and reduced bottom temperatures up to 5 ºC in 1 h. The periodicity of temperature variability at the moorings showed significant coherence with the diurnal variability in zonal winds (>95% confidence interval) and was not coherent with the semidiurnal tide. We propose that windforced, diurnal internal motions may provide an important nutrient source for primary producers during reduced upwelling periods and merit further study as a fertilization source in the southern part of the California Current System.
format	info:eu-repo/semantics/article
author	Ladah, Lydia Betty Leichter, James J Filonov, Anatoliy Tereshchenko, Iryna
spellingShingle	Ladah, Lydia Betty Leichter, James J Filonov, Anatoliy Tereshchenko, Iryna Diurnal frequency internal waves in the southern part of the California Current ecosystem as a nutrient source
author_facet	Ladah, Lydia Betty Leichter, James J Filonov, Anatoliy Tereshchenko, Iryna
author_sort	Ladah, Lydia Betty
title	Diurnal frequency internal waves in the southern part of the California Current ecosystem as a nutrient source
title_short	Diurnal frequency internal waves in the southern part of the California Current ecosystem as a nutrient source
title_full	Diurnal frequency internal waves in the southern part of the California Current ecosystem as a nutrient source
title_fullStr	Diurnal frequency internal waves in the southern part of the California Current ecosystem as a nutrient source
title_full_unstemmed	Diurnal frequency internal waves in the southern part of the California Current ecosystem as a nutrient source
title_sort	diurnal frequency internal waves in the southern part of the california current ecosystem as a nutrient source
publisher	Iniversidad Autónoma de Baja California
publishDate	2017
url	https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/2785
_version_	1792610712436080640

Diurnal frequency internal waves in the southern part of the California Current ecosystem as a nutrient source

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