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Evidencia de calor climático extremo de los vertebrados árticos del Cretácico tardío
1J. A. Tarduno, R. D. Cottrell, H. Scher, Department of Earth and Environmental Sciences, University of Rochester, Rochester, NY, 14627, USA. D. B. Brinkman, Royal Tyrrell Museum of Palaeontology, Drumheller, Alberta, TOJ OYO, Canada. P. R. Re.
Science (New York, N.Y.)
|December 18, 1998
Resumen
Los climas polares durante el Cretácico Tardío fueron sorprendentemente cálidos, superando los 14°C, no cerca del punto de congelación. Este hallazgo está respaldado por fósiles de vertebrados y evidencia de actividad volcánica.
Área de la Ciencia:
- Paleoclimatología Paleoclimatología
- Paleontología de los vertebrados.
- La geoquímica es la geoquímica.
Sus antecedentes:
- El clima de las regiones polares del Cretácico Tardío es objeto de debate, con algunas pruebas que sugieren condiciones frías.
- Comprender los climas polares pasados es crucial para predecir el cambio climático futuro.
- Las grandes provincias ígneas (LIP) están asociadas con importantes emisiones volcánicas.
Objetivo del estudio:
- Para reconstruir el clima del Ártico del Cretácico Tardío utilizando evidencia paleontológica.
- Para investigar el papel potencial del vulcanismo en la conducción del calor polar durante este período.
Principales métodos:
- Análisis de un conjunto de fósiles de vertebrados de la isla Axel Heiberg, Canadá.
- Análisis geoquímico de las grandes provincias ígneas contemporáneas.
Principales resultados:
- El descubrimiento de un conjunto de vertebrados, incluidos los grandes champsosaurios (reptiles extintos parecidos a los cocodrilos), indica un clima polar cálido (temperatura media anual >14°C).
- Identificación de seis grandes provincias ígneas principales activas durante el mismo período (hace 92-86 millones de años).
Conclusiones:
- Los climas polares del Cretácico tardío fueron significativamente más cálidos de lo que se suponía anteriormente, desafiando los modelos existentes.
- Las emisiones de dióxido de carbono volcánico del magmatismo contemporáneo probablemente contribuyeron al calentamiento global y al aumento de las temperaturas polares.
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