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Pérdida de carbono de las profundidades marinas desde el último máximo glacial
Jimin Yu1, Wally S Broecker, Harry Elderfield
1Lamont-Doherty Earth Observatory of Columbia University, 61 Route 9W/Post Office Box 1000, Palisades, NY 10964-8000, USA. jiminyu@ldeo.columbia.edu
Science (New York, N.Y.)
|November 25, 2010
Resumen
La liberación de carbono en el océano en el pasado influyó en el CO2 atmosférico. Al principio de la deglaciación, el carbono liberado se quedó en la atmósfera. Más tarde, la biosfera terrestre absorbió cantidades significativas de este carbono liberado.
Área de la Ciencia:
- La paleoceanografía es la paleoceanografía.
- Ciencias del clima Ciencias del clima Ciencias del clima
- Investigación del ciclo del carbono.
Sus antecedentes:
- Las concentraciones de iones de carbonato y los isótopos de carbono en el océano profundo son cruciales para comprender la dinámica del ciclo del carbono pasado y los cambios en el CO2 atmosférico.
- Las reconstrucciones de iones de carbonato existentes en aguas profundas son contradictorias, lo que dificulta las interpretaciones paleoceanográficas precisas.
Objetivo del estudio:
- Para reconstruir las concentraciones de iones carbonato de aguas profundas ([CO3(2-) ) desde el último período glacial.
- Para resolver discrepancias en los datos existentes de iones de carbonato de aguas profundas.
- Para investigar la redistribución de carbono entre el océano, la tierra y la atmósfera durante la deglaciación.
Principales métodos:
- Concentraciones cuantificadas de iones de carbonato de aguas profundas ([CO3(2-) ] utilizando las proporciones de boro/calcio bentónico foraminiferal en cinco núcleos oceánicos.
- Se analizaron las proporciones combinadas de isótopos de carbono bentónico (δ(13) C) y las concentraciones de iones carbonato.
Principales resultados:
- La liberación de dióxido de carbono (CO2) en aguas profundas durante el período deglacial temprano (17.5-14.5 ka) se almacenó preferentemente en la atmósfera.
- Durante el último período deglacial (14-10 ka), el CO2 liberado contribuyó al aumento de la atmósfera y fue absorbido significativamente por la biosfera terrestre.
Conclusiones:
- La biosfera terrestre jugó un papel clave en la regulación del CO2 atmosférico durante la deglaciación.
- Comprender la liberación de carbono del océano y la absorción terrestre es vital para reconstruir los cambios climáticos pasados.
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