Effect of seawater carbonate concentration on foraminiferal carbon and oxygen isotopes

Article Abstract:

The 18 O/16 O ratio and 13 C/12 C ratios of the calcite shells of living non-symbiotic and symbiotic plankton foraminifera decline when seawater increases. Standard glacial foraminiferal stable-isotope information does not predict this finding, nor does it support the hypothesis that a transfer of terrestrial carbon into the sea could have produced the glacial-interglacial change in the 13 C/12 C ratio. The extreme stable-isotope differences in the Phanerozoic and Proterozoic aeons may be explained by the carbonate-concentration effect.

Observations, Carbon, Climatic changes, Climate change, Paleontology, Letter to the Editor, Plankton research, Carbon isotopes, Proterozoic Eon

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Rapid subtropical North Atlantic salinity oscillations across Dansgaard-Oeschger cycles

Article Abstract:

The way in which rapid reorganizations of the ocean-atmosphere system across the Dangaard-Oeschger cycles are linked to salinity changes in the subtropical North Atlantic gyre are investigated. It is found that increased stadial salinities preconditioned the North Atlantic Ocean for a rapid return to deep overturning circulation and high-latitude warming by contributing to increased North Atlantic surface-water density on interstadial transitions.

Ocean-atmosphere interaction, Oscillation, Oscillations, North Atlantic region

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Links between salinity variation in the Caribbean and North Atlantic thermohaline circulation

Article Abstract:

Tropical oceans play a vital role in glacial-interglacial climate transitions. Two Caribbean Sea sediment cores, combining Mg/Ca palaeothermometry with measurements of oxygen isotopes in foraminiferal calcite in order to reconstruct tropical Atlantic surface salinity, is analyzed.

Measurement, Oxygen, Salinity, Oxygen isotopes, Atlantic Ocean

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