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Influencia de altas latitudes en el clima del Pacífico ecuatorial oriental en la época del Pleistoceno temprano

Zhonghui Liu¹, Timothy D Herbert

¹Department of Geological Sciences, Brown University, Providence, Rhode Island 02912, USA. Zhonghui_Liu@brown.edu

|February 20, 2004

Resumen

Los registros climáticos tropicales del Pleistoceno temprano muestran ciclos dominantes de 41 kyr, a diferencia de los períodos posteriores. Esto sugiere que los procesos de altas latitudes, impulsados por la oblicuidad de la Tierra, controlaron la variabilidad temprana del clima tropical.

Área de la Ciencia:

Paleoclimatología Paleoclimatología
Geología marina Geología marina.
Ciencias del Sistema Terrestre Ciencias del Sistema Terrestre

Sus antecedentes:

Los registros de clima tropical muestran típicamente ciclos de 23 kyr y 100 kyr.
Los registros de altas latitudes muestran pronunciados ciclos de oblicuidad de 41-kyr.
Existe una comprensión limitada de la variabilidad del clima tropical antes de la transición del Pleistoceno medio (hace 900 millones de años).

Objetivo del estudio:

Reconstruir las temperaturas de la superficie del mar del Pleistoceno temprano (SST) y la productividad marina en el Pacífico ecuatorial oriental.
Investigar los mecanismos dominantes de forzamiento orbital en los trópicos antes de la transición del Pleistoceno medio.
Determinar la relación entre la variabilidad del clima tropical y los procesos de altas latitudes.

Principales métodos:

Análisis de alquenonas en núcleos de sedimentos marinos del Pacífico ecuatorial oriental.
Reconstrucción de las temperaturas de la superficie del mar y la productividad marina durante los últimos 1,8 millones de años.
Análisis espectral para identificar patrones cíclicos dominantes (por ejemplo, oblicuidad, precesión).

Principales resultados:

Los registros del Pleistoceno temprano (1.81.2 Myr hace) están dominados por ciclos de oblicuidad de 41-kyr.
Se observó una pequeña contribución de la precesión orbital.
Las variaciones del SST del Pleistoceno temprano estaban inversamente relacionadas con la insolación anual local.

Conclusiones:

La variabilidad del clima tropical del Pleistoceno temprano fue impulsada principalmente por procesos de altas latitudes.
La oblicuidad orbital forzosa, actuando a través de mecanismos de altas latitudes, dictó los patrones climáticos tropicales antes de la transición del Pleistoceno medio.
Esto contrasta con el dominio posterior de la precesión y los ciclos de 100 kyr en el clima tropical.

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