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Role of Biological Production in Pleistocene Atmospheric Carbon DioxideVariations and the Nitrogen Isotope Dynamics of the Southern Ocean

机译:生物生产在更新世大气二氧化碳变化中的作用及南大洋氮同位素动态

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This dissertation contributes to the search for a cause of glacial/interglacialvariations in atmospheric carbon dioxide. The hypotheses addressed involve changes in low and high-latitude biological export production. A modelling exercise demonstrates that the paleoceanographic record of calcite preservation places constraints on hypothesized changes in low latitude biological production. The model results indicate that large, production-driven changes in the depth of the calcite saturation horizon during the last ice age would have caused a similar deepening of the calcite lysocline, even when the effect of sediment respiration-driven dissolution is considered. Such a large glacial lysocline deepening is not evident on an ocean-average basis. The results indicate very few mechanisms by which low latitude production could have driven Pleisotocene carbon dioxide variations, generally arguing against a low latitude cause for these variations.

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