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El cambio sincrónico de la SST tropical del Mar Meridional de China y el calentamiento de Groenlandia durante la
M Kienast1, S Steinke, K Stattegger
1Earth and Ocean Sciences, University of British Columbia, Vancouver, B.C. Canada V6T 1Z4. kienast@unixg.ubc.ca
Science (New York, N.Y.)
|March 17, 2001
Resumen
Los océanos tropicales influyen significativamente en el clima global. Nuevos registros de temperatura de la superficie del mar revelan un evento de calentamiento sincrónico con cambios climáticos de altas latitudes al final del último período glacial.
Área de la Ciencia:
- Paleoclimatología Paleoclimatología
- Oceanografía La oceanografía es la oceanografía.
- Ciencias del clima Ciencias del clima Ciencias del clima Ciencias del clima
Sus antecedentes:
- El océano tropical es un motor clave de la dinámica climática global.
- La comprensión de los eventos climáticos bruscos del pasado requiere una fase precisa entre la variabilidad climática tropical y de altas latitudes.
- Los eventos climáticos bruscos del pasado ofrecen información sobre los mecanismos globales del cambio climático.
Objetivo del estudio:
- Para reconstruir la variabilidad de la temperatura de la superficie del mar tropical (SST) durante el último período glacial.
- Para determinar el momento de los cambios climáticos tropicales en relación con los eventos de alta latitud.
- Para investigar la sincronicidad entre el calentamiento de los océanos tropicales y el evento de calentamiento de Bølling.
Principales métodos:
- Análisis alquenónico de núcleos de sedimentos del Mar de China Meridional tropical para generar registros de SST.
- Datación radiométrica de núcleos de sedimentos para establecer un marco cronológico preciso.
- Comparación de los registros SST tropicales con los archivos paleoclimáticos establecidos, como los núcleos de hielo.
Principales resultados:
- Se identificó un aumento abrupto en el SST tropical del Mar del Sur de China de al menos 1 ° C al final del último período glacial.
- Este aumento del SST es sincrónico, dentro de las incertidumbres de datación, con el evento de calentamiento de Bølling.
- El evento de calentamiento de Bølling ocurrió hace aproximadamente 14.6 mil años, como lo demuestra el núcleo de hielo del Proyecto de capa de hielo de Groenlandia 2.
Conclusiones:
- Las temperaturas de los océanos tropicales respondieron rápidamente a los principales cambios climáticos al final del último período glacial.
- La sincronicidad observada sugiere una posible teleconexión entre el calentamiento de los océanos tropicales y los eventos climáticos de altas latitudes.
- Estos hallazgos mejoran nuestra comprensión de los mecanismos que impulsan el cambio climático global durante los períodos de calentamiento abrupto.
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