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Removal of Exogenous Materials from the Outer Portion of Frozen Cores to Investigate the Ancient Biological Communities Harbored Inside
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Cambios glaciales / interglaciales en la estratificación de la estratificación subartica del Pacífico Norte.

S L Jaccard1, G H Haug, D M Sigman

  • 1Department of Earth Sciences, Sonneggstrasse 5, ETHZ, 8092 Zurich, Switzerland. jaccard@erdw.ethz.ch

Science (New York, N.Y.)
|May 14, 2005
PubMed
Resumen
Este resumen es generado por máquina.

La baja productividad de las algas durante las edades de hielo en el Pacífico Norte estaba vinculada a la estratificación oceánica, no a la cubierta de hielo marino. Este hallazgo impacta nuestra comprensión de los ciclos glaciales y los niveles de dióxido de carbono atmosférico.

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Área de la Ciencia:

  • La paleoceanografía es la paleoceanografía.
  • Biología Marina Biología Marina.
  • Ciencias del clima Ciencias del clima Ciencias del clima

Sus antecedentes:

  • Estudios anteriores observaron una baja productividad de algas en las aguas antárticas durante las edades de hielo.
  • Se debatió si esto se debía a la estratificación del océano o a la reducción de la cubierta de hielo marino que afectaba a la disponibilidad de luz.
  • La baja productividad de las algas durante los períodos glaciales tiene implicaciones para los ciclos globales del carbono.

Objetivo del estudio:

  • Para investigar la causa de la baja productividad de las algas durante las edades de hielo en el Pacífico Norte Subártico.
  • Para determinar si la estratificación o la extensión del hielo marino limita la productividad en esta región.
  • Evaluar las implicaciones para las concentraciones de dióxido de carbono atmosférico durante los ciclos glaciales.

Principales métodos:

  • Análisis de núcleos de sedimentos del sitio del Programa de Perforación Oceánica 882.2.
  • Medición de las concentraciones de bario biogénico como un sustituto de la productividad de las algas.
  • Comparación de la ubicación del sitio en relación con la extensión del hielo marino glacial.

Principales resultados:

  • El análisis de sedimentos reveló una baja productividad de las algas durante las edades de hielo en el Pacífico Norte subártico.
  • El sitio 882 del Programa de Perforación Oceánica se encuentra al sur de la extensión de hielo marino de verano, incluso durante los máximos glaciales.
  • Este contexto geográfico descarta la limitación de la luz impulsada por el hielo marino como la causa principal.

Conclusiones:

  • La estratificación oceánica se identifica como el principal impulsor de la reducción de la productividad de las algas durante las edades de hielo en el Pacífico Norte subártico.
  • Los hallazgos apoyan la estratificación, en lugar de la cubierta de hielo marino, como el factor clave.
  • Esto tiene implicaciones significativas para la comprensión de la regulación del dióxido de carbono atmosférico durante ciclos glaciales pasados.