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El latido del corazón del sistema climático del Oligoceno
Heiko Pälike1, Richard D Norris, Jens O Herrle
1National Oceanography Centre, Southampton, School of Ocean and Earth Science, European Way, Southampton SO14 3ZH, UK. H.Palike@soton.ac.uk
Science (New York, N.Y.)
|December 23, 2006
Resumen
Un registro climático de 13 millones de años revela un "latido del corazón" del ciclo global del carbono relacionado con los ciclos orbitales y las edades de hielo. Esto sugiere una interacción fundamental entre el ciclo del carbono de la Tierra, el forzamiento solar y los eventos glaciales.
Área de la Ciencia:
- Paleoclimatología Paleoclimatología
- Ciencias del Sistema Terrestre Ciencias del Sistema Terrestre
- Oceanografía La oceanografía es la oceanografía.
Sus antecedentes:
- Los registros climáticos del Oligoceno proporcionan información sobre la dinámica del sistema terrestre a largo plazo.
- Se sabe que las variaciones orbitales influyen en el clima de la Tierra y en las edades de hielo.
- El ciclo global del carbono juega un papel crucial en la regulación del clima.
Objetivo del estudio:
- Investigar la relación a largo plazo entre los ciclos orbitales, el ciclo global del carbono y los eventos glaciales.
- Para identificar periodicidades en el clima y la dinámica del ciclo del carbono durante el Oligoceno.
- Comprender los mecanismos que impulsan las respuestas del sistema climático al forzamiento orbital.
Principales métodos:
- Análisis de un registro climático continuo de 13 millones de años del Pacífico ecuatorial.
- Identificación de los ciclos en los eventos glaciales y el ciclo del carbono.
- Modelado de caja para simular la interacción del ciclo del carbono y el forzamiento solar.
Principales resultados:
- A se pronuncia A.
- El latido del corazón el latido del corazón.
- en el ciclo global del carbono y la periodicidad glacial fue identificada.
- Se detectaron ciclos de 405.000, 127.000 y 96.000 años de excentricidad y oblicuidad de 1,2 millones de años.
- El ciclo de excentricidad de 405.000 años se ve amplificado por el largo tiempo de residencia del carbono en los océanos.
Conclusiones:
- El sistema climático exhibe una interacción fundamental entre el ciclo del carbono, el forzamiento solar y los eventos glaciales.
- Las variaciones orbitales modulan la acidez de los océanos profundos y la producción/enterramiento global de biomasa.
- El largo tiempo de residencia del carbono oceánico amplifica los ciclos de excentricidad a largo plazo.
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