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El rápido aumento del nivel del mar hace 19.000 años y sus implicaciones globales
Peter U Clark1, A Marshall McCabe, Alan C Mix
1Department of Geosciences, Oregon State University, Corvallis, OR 97331, USA. clarkp@geo.oregonstate.edu
Science (New York, N.Y.)
|May 25, 2004
Resumen
Un aumento significativo del nivel del mar, o pulso de agua de deshielo, ocurrió hace 19.000 años, originado en las capas de hielo del hemisferio norte. Este evento enfrió el Atlántico Norte mientras calentaba los trópicos y el hemisferio sur.
Área de la Ciencia:
- Paleoclimatología Paleoclimatología
- Oceanografía La oceanografía es la oceanografía.
- Glaciología glaciología.
Sus antecedentes:
- Los cambios en el nivel del mar y la dinámica climática durante la deglaciación son fundamentales para comprender el sistema climático de la Tierra.
- El papel de las capas de hielo del hemisferio norte en los bruscos cambios climáticos requiere una mayor investigación.
Objetivo del estudio:
- Para investigar el momento y la fuente de un evento abrupto de aumento del nivel del mar alrededor de 19,000 años antes del presente (B.P. En el caso de las personas que se encuentran en situación de exclusión social.
- Para dilucidar los mecanismos que impulsan la respuesta climática global a este pulso de agua de deshielo.
Principales métodos:
- Análisis de la evidencia de la cuenca del Mar de Irlanda.
- Examen de los registros climáticos, incluida la formación de aguas profundas del Atlántico Norte y las temperaturas oceánicas.
Principales resultados:
- La evidencia apoya un aumento abrupto del nivel del mar (pulso de agua de deshielo) en 19.000 años BP. en la cuenca del Mar de Irlanda.
- Una reducción en la formación de aguas profundas del Atlántico Norte y el enfriamiento del Atlántico Norte coincidió con el pulso del agua de deshielo.
- El calentamiento simultáneo ocurrió en el Atlántico tropical, los océanos Pacífico y el hemisferio sur.
Conclusiones:
- El pulso de agua de deshielo probablemente se originó en las capas de hielo del hemisferio norte.
- El estudio identifica mecanismos para propagar las señales climáticas deglaciales a nivel mundial, explicando el enfriamiento del hemisferio norte y el calentamiento del hemisferio sur.
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