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Las reconstrucciones de temperatura e hidrología de 2.000 años de duración de la piscina cálida del Indo-Pacífico

Delia W Oppo¹, Yair Rosenthal, Braddock K Linsley

¹Department of Geology and Geophysics, Woods Hole Oceanographic Institution, Woods Hole, Massachusetts 02543, USA. doppo@whoi.edu

|August 29, 2009

Resumen

Una nueva reconstrucción de la temperatura de la superficie del mar desde la piscina cálida tropical del Indo-Pacífico revela variaciones climáticas pasadas. Este registro muestra que el final del siglo XX fue más cálido que los períodos anteriores, alineándose con las tendencias del hemisferio norte.

Área de la Ciencia:

Paleoclimatología Paleoclimatología
Oceanografía La oceanografía es la oceanografía.
Ciencias del clima Ciencias del clima Ciencias del clima

Sus antecedentes:

Las reconstrucciones de la temperatura del hemisferio norte indican un calentamiento reciente.
Las regiones tropicales, particularmente la piscina cálida del Indo-Pacífico (IPWP), son cruciales para el clima global.
Las reconstrucciones existentes se basan en datos terrestres, con vistas a las influencias oceánicas.

Objetivo del estudio:

Para reconstruir las temperaturas pasadas de la superficie del mar (SST) en el IPWP durante los últimos dos milenios.
Para comparar los datos SST basados en proxy con registros instrumentales y tendencias del hemisferio norte.
Comprender la influencia de la hidrología del IPWP en el sistema de monzones del este de Asia.

Principales métodos:

Decadalmente resuelta la reconstrucción continua del SST desde el estrecho de Makassar, Indonesia.
Utilizó datos proxy que se superponen con el registro instrumental para la comparación directa.
Reconstrucción de acompañamiento del delta de agua de mar ((18) O como indicador de salinidad e hidrología.

Principales resultados:

La reconstrucción del SST del IPWP muestra tendencias similares a las reconstrucciones de la temperatura del hemisferio norte.
Las SST reconstruidas eran comparables a los valores modernos durante el Período Cálido Medieval (1000-1250 d.C.).
Las temperaturas de la superficie del mar durante la Pequeña Edad de Hielo eran más frías que los valores modernos, con una variabilidad significativa.

Conclusiones:

El registro SST del IPWP proporciona una valiosa perspectiva a largo plazo sobre la variabilidad del clima tropical.
La hidrología del IPWP está fuertemente acoplada con el sistema de monzones del este de Asia en escalas de tiempo centenarias y milenarias.
Las variaciones de temperatura IPWP pasadas ofrecen un contexto para comprender el cambio climático actual y futuro.

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