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Palaeoceanografía Un Mediterráneo Ártico cálido y mal ventilado durante el último período glacial

D J R Thornalley¹, H A Bauch², G Gebbie³

¹Woods Hole Oceanographic Institution (WHOI), Woods Hole, MA 02543, USA. Department of Geography, University College London, London WC1E 6BT, UK.

Science (New York, N.Y.)

|August 15, 2015

Resumen

El Mediterráneo Ártico glacial (AM) estaba mal ventilado y más cálido que hoy. La mezcla deglacial de esta agua profunda puede haber contribuido al derretimiento de las capas de hielo y el hielo marino.

Área de la Ciencia:

La oceanografía
Paleoclimatología
Ciencias del clima

Sus antecedentes:

Los cambios en la formación de agua densa del Ártico Mediterráneo (AM) influyen en el clima global.
La comprensión de la circulación pasada de AM es clave para reconstruir la dinámica climática del período glacial.

Objetivo del estudio:

Para reconstruir los cambios pasados en la circulación AM en los últimos 30.000 años.
Investigar la ventilación y la temperatura del AM profundo durante el período glacial y la deglaciación.

Principales métodos:

Reconstrucción de las edades de ventilación por radiocarbono en las profundidades de los mares nórdicos.
Análisis de los datos proxy para las variaciones de temperatura de las profundidades de la AM.

Principales resultados:

El AM glacial profundo exhibió una ventilación extremadamente pobre, con edades de hasta 10.000 años.
El desbordamiento episódico de aguas profundas envejecidas en el Atlántico Norte ocurrió durante la deglaciación.
La AM glacial profunda fue 2 ° 3 ° C más cálida que las temperaturas actuales.

Conclusiones:

La mala ventilación y las temperaturas elevadas caracterizaron el AM glacial profundo.
La deshidratación de la AM durante la deglaciación probablemente influyó en el hielo marino, los icebergs y el derretimiento de las capas de hielo.
Los cambios en la circulación de AM son un factor significativo en la variabilidad del clima glacial e interglacial.

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