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Mecanismos del calentamiento climático al final del paleoceno
1Department of Earth Sciences, Oxford University, Parks Road, Oxford, OX1 3PR, UK. Department of Geology and Geophysics, Woods Hole Oceanographic Institution, Woods Hole, MA 02543, USA.
Science (New York, N.Y.)
|July 31, 1999
Resumen
El calentamiento global al final de la época del Paleoceno fue causado potencialmente por la desgasificación del hidrato de metano. Las múltiples inyecciones de metano impactaron el clima de la Tierra, con evidencia que sugiere que estos eventos fueron globales.
Área de la Ciencia:
- Paleoclimatología Paleoclimatología
- La geoquímica es la geoquímica.
- Ciencias de la Tierra Ciencias de la Tierra Ciencias de la Tierra
Sus antecedentes:
- El Máximo Térmico Paleoceno-Eoceno (PETM) fue un período de rápido calentamiento global.
- Los desencadenantes y mecanismos precisos de este evento de calentamiento aún se debaten.
- Los hidratos de metano son una fuente potencial de gases de efecto invernadero.
Objetivo del estudio:
- Para investigar el papel de la desgasificación del hidrato de metano en el evento de calentamiento del Paleoceno-Eoceno.
- Para analizar los registros de isótopos de carbono y oxígeno en busca de evidencia de liberación de metano.
- Para determinar la escala y la frecuencia de los eventos potenciales de liberación de metano.
Principales métodos:
- Análisis de las proporciones de isótopos de oxígeno y carbono de los registros geológicos.
- Comparación de datos isotópicos de dos ubicaciones geográficamente distintas.
- Correlación de los cambios isotópicos para identificar los eventos climáticos globales.
Principales resultados:
- Los datos de isótopos indican múltiples y distintas liberaciones de metano.
- Estas inyecciones de metano coincidieron con períodos de calentamiento global.
- La evidencia sugiere que estos eventos tuvieron un alcance global, impactando el clima en todo el mundo.
- Se observaron intervalos de estasis del ciclo del carbono entre los eventos de liberación de metano.
Conclusiones:
- La desgasificación biogénica del hidrato de metano probablemente jugó un papel importante en el abrupto calentamiento global al final del Paleoceno.
- Los datos apoyan un modelo de múltiples eventos de liberación de metano sincronizados globalmente.
- Estos hallazgos mejoran nuestra comprensión de las dinámicas climáticas pasadas y los posibles mecanismos de retroalimentación.
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