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El calentamiento del hemisferio sur y de las profundidades marinas provocó el aumento del CO2 atmosférico deglacial y
Lowell Stott1, Axel Timmermann, Robert Thunell
1Department of Earth Sciences, University of Southern California, Los Angeles, CA 90089, USA. stott@usc.edu
Science (New York, N.Y.)
|September 29, 2007
Resumen
Los cambios climáticos pasados de la Tierra fueron impulsados por el calentamiento del hemisferio sur, no por el CO2. Este calentamiento deglacial de aguas profundas precedió al aumento del CO2 atmosférico, lo que indica factores de forzamiento externos.
Área de la Ciencia:
- Paleoclimatología Paleoclimatología
- Oceanografía La oceanografía es la oceanografía.
- La dinámica del clima La dinámica del clima La dinámica del clima
Sus antecedentes:
- Comprender los cambios climáticos pasados es crucial para predecir el cambio climático futuro.
- La última terminación glacial ofrece información sobre la sensibilidad del sistema climático de la Tierra.
Objetivo del estudio:
- Para determinar con precisión la cronología del cambio climático de altas y bajas latitudes durante la última terminación glacial.
- Identificar los principales impulsores del temprano calentamiento deglacial de aguas profundas.
Principales métodos:
- La datación por radiocarbono de núcleos de sedimentos marinos.
- Análisis de isótopos bentónicos y planctónicos para isótopos estables de los foraminiferos.
- Magnesio / calcio (Mg / Ca) paleotermometría. paleotermometría de magnesio y calcio (Mg / Ca).
Principales resultados:
- Las temperaturas de las profundidades marinas en el Pacífico tropical occidental se calentaron en ~2°C entre 19,000 y 17,000 años antes del presente (ky B.P. En el caso de las personas que se encuentran en situación de exclusión social.
- Este calentamiento de aguas profundas precedió el aumento del CO2 atmosférico y el calentamiento de la superficie oceánica tropical por aproximadamente 1000 años.
- El calentamiento temprano no fue iniciado por procesos tropicales o forzamiento de CO2.
Conclusiones:
- El aumento de la insolación de la primavera austral se identifica como un factor clave que inicia el calentamiento deglacial.
- Las retroalimentaciones de albedo del hielo marino amplificaron la señal de calentamiento inicial.
- Este estudio desafía la iniciación directa impulsada por CO2 del calentamiento deglacial temprano.
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