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Temperaturas del océano tropical en los últimos 3,5 millones de años
Timothy D Herbert1, Laura Cleaveland Peterson, Kira T Lawrence
1Department of Geological Sciences, Brown University, Providence, RI 02912, USA.
Science (New York, N.Y.)
|June 19, 2010
Resumen
Las temperaturas de la superficie del mar tropical (SSTs) siguieron de cerca las edades de hielo en los últimos 3,5 millones de años, lo que sugiere un forzamiento atmosférico "de arriba hacia abajo". Un bucle de retroalimentación amplificó la fuerza orbital hace unos 2,7 millones de años.
Área de la Ciencia:
- Paleoclimatología Paleoclimatología
- Oceanografía La oceanografía es la oceanografía.
- Ciencias del clima Ciencias del clima Ciencias del clima Ciencias del clima
Sus antecedentes:
- La comprensión de las edades de hielo Plio-Pleistoceno requiere el conocimiento de los cambios de temperatura de la superficie del mar tropical (SST).
- Los registros SST basados en alquenona proporcionan información sobre las temperaturas oceánicas pasadas y la dinámica climática.
Objetivo del estudio:
- Determinar el momento y la amplitud de las variaciones de las SST tropicales durante el Pliopleistoceno.
- Para investigar la relación entre las SST tropicales, el volumen de hielo y el forzamiento orbital.
Principales métodos:
- Análisis de registros de SST tropicales basados en alquenonas de las principales cuencas oceánicas.
- Comparación de los datos del SST con el volumen global de hielo y los registros de temperatura de las profundidades oceánicas.
- Correlación con el delta18O bentónico y los datos de forzamiento orbital.
Principales resultados:
- Cambios coherentes de SST glacial-interglacial de 1-3 ° C observados en las cuencas oceánicas.
- Los cambios de SST tropicales llevaron ligeramente al volumen global de hielo y a los cambios de temperatura de las profundidades oceánicas.
- Estrecho acoplamiento de temperaturas tropicales con delta bentónico18O y forzamiento orbital después de hace 2,7 millones de años.
Conclusiones:
- Los cambios de la SST tropical reflejan el forzamiento atmosférico "de arriba hacia abajo" a través de regiones oceánicas diferentes.
- Una fuerte retroalimentación de dióxido de carbono y gases de efecto invernadero amplificó la fuerza orbital hace unos 2,7 millones de años.
- Este forzamiento amplificado vinculó las capas de hielo del hemisferio norte a las temperaturas globales del océano desde entonces.
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