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Cambios climáticos sincrónicos en la Antártida y el Atlántico Norte
1E. J. Steig, J. W. C. White, S. J. Lehman, Institute of Arctic and Alpine Research, University of Colorado, Boulder, CO 80309, USA. E. J. Brook, Department of Geology, Washington State University, Vancouver, WA 98686, USA. C. M. Sucher, Gradua.
Science (New York, N.Y.)
|October 2, 1998
Resumen
Los núcleos de hielo antárticos revelan cambios climáticos sincrónicos con el hemisferio norte, lo que desafía las nociones anteriores de respuestas hemisféricas asincrónicas a eventos bruscos de cambio climático.
Área de la Ciencia:
- Paleoclimatología Paleoclimatología
- Glaciología glaciología.
- Oceanografía La oceanografía es la oceanografía.
Sus antecedentes:
- Los núcleos de hielo de Groenlandia muestran cambios climáticos abruptos durante 100.000 años.
- Los núcleos de aguas profundas del Atlántico Norte confirman los vínculos entre la variabilidad climática milenaria y la circulación termohalina oceánica.
Objetivo del estudio:
- Para investigar los registros climáticos de la Antártida en busca de evidencia de los principales eventos climáticos del Atlántico Norte.
- Para comparar las respuestas climáticas de la Antártida con las del hemisferio norte.
Principales métodos:
- Análisis de un núcleo de hielo de Taylor Dome, en el oeste del Mar de Ross, Antártida.
- Comparación de los datos climáticos de la Antártida con los registros existentes de Groenlandia y el Atlántico Norte.
Principales resultados:
- El núcleo de hielo de Taylor Dome registra dos eventos importantes en el Atlántico Norte: el calentamiento del final de la glaciación y la oscilación de Bolling/Allerod-Younger Dryas.
- Este registro sincrónico contrasta con las respuestas asíncronas observadas en otros núcleos de hielo antárticos.
Conclusiones:
- Los cambios climáticos abruptos en la región del Atlántico Norte se reflejan en la Antártida Occidental.
- Esto sugiere un sistema climático más acoplado entre los hemisferios que lo indicado anteriormente por algunos registros antárticos.
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