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Reducción de la mezcla debido a la rotura de las olas internas en aguas ecuatoriales
Michael C Gregg1, Thomas B Sanford, David P Winkel
1Applied Physics Laboratory, College of Fishery and Ocean Sciences, University of Washington, Seattle, Washington 98105, USA. gregg@apl.washington.edu
Nature
|April 4, 2003
Resumen
La mezcla de los océanos es menos eficiente cerca del ecuador. Las tasas de disipación de las ondas internas y la mezcla de densidad cruzada resultante son significativamente más bajas en las regiones ecuatoriales en comparación con las latitudes medias.
Área de la Ciencia:
- Oceanografía La oceanografía es la oceanografía.
- Dinámica de fluidos La dinámica de fluidos.
- Ciencias del clima ciencia del clima.
Sus antecedentes:
- El calor, la sal y el transporte de nutrientes oceánicos ocurren principalmente dentro de masas de agua de densidad uniforme.
- La mezcla a través de las superficies de densidad es crucial para el clima de la Tierra y la distribución de organismos.
- La rotura interna de ondas es el principal impulsor de la mezcla turbulenta a través de las superficies de densidad.
Objetivo del estudio:
- Para investigar la dependencia de latitud de la disipación y mezcla de ondas internas.
- Extender los hallazgos previos de latitudes medias sobre las tasas de disipación a las regiones ecuatoriales.
- Para cuantificar la mezcla a través de superficies de densidad en los océanos Pacífico y Atlántico.
Principales métodos:
- Recopilación de datos de temperatura y fluctuación de velocidad en los océanos Pacífico y Atlántico.
- Observando regiones oceánicas entre 42 grados N y 2 grados S de latitud.
- Analizando las tasas de disipación y mezcla a través de las superficies de densidad.
Principales resultados:
- Las tasas de disipación exhiben una fuerte dependencia de latitud, alineándose con las predicciones teóricas.
- Cerca del ecuador, las tasas de disipación son menos del 10% de las tasas de latitud media para fondos de ondas internas comparables.
- La mezcla entre superficies de densidad se reduce sustancialmente en aguas ecuatoriales.
Conclusiones:
- La mezcla oceánica a través de superficies de densidad es significativamente menos eficiente cerca del ecuador.
- La mezcla ecuatorial reducida debe incorporarse a los modelos numéricos de dinámica oceánica.
- Estos hallazgos tienen implicaciones para el modelado del cambio climático y la comprensión de los ciclos biogeoquímicos oceánicos.
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