Deep ocean nutrients during the Last Glacial Maximum deduced from sponge silicon isotopic compositions
The relative importance of biological and physical processes within the Southern Ocean for the storage of carbon and atmospheric pCO₂ on glacial-interglacial timescales remains uncertain. Understanding the impact of surface biological production on carbon export in the past relies on the reconstruction of the nutrient supply from upwelling deep waters. In particular, the upwelling of silicic acid (Si(OH)₄) is tightly coupled to carbon export in the Southern Ocean via diatom productivity. Here...Expand abstract
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