Interhemispheric synchrony of the last deglaciation inferred from alkenone palaeothermometry

Article Abstract:

The alkenone sea surface temperature reconstruction method is applied to high-resolution sediment cores obtained from the tropical Indian Ocean. Accelerator mass spectrometry 14C is used to precisely date the cores. The estimated initial sea surface temperature warming around 15,000 years ago at 20 degrees S is in phase with Northern Hemisphere sea and air temperature changes, but is behind Antarctic warming by thousands of years. The data indicate that changes in the ocean's global thermohaline circulation were not the only cause of interhemispheric climate teleconnection during the last deglaciation.

Glacial climates, Sediments (Geology)

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Moisture transport across Central America as a positive feedback on abrupt climatic changes

Article Abstract:

The sea surface salinities are reconstructed in the eastern equatorial Pacific Ocean over the past 90,000 years by comparing palaeotemperature estimates from alkenones and Mg/Ca ratios with foraminiferal oxygen isotope ratios that change with both temperature and salinity. The analysis has shown that millennial-scale fluctuations of moisture transport have constituted an important feedback mechanism for sudden climate changes, modulating the North Atlantic freshwater budget.

Central America, Environmental aspects, Natural history, Climatic changes, Climate change, Salinity

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Reconstructing sea surface temperature and salinity using delta18O and alkenone records

Article Abstract:

The abundance of alkenones in certain algae indicates palaeotemperatures. This technique was successfully applied to a sample drawn from the Arabian Sea-Bay of Bengal juncture, supporting and greatly extending previous studies of sea temperature in the region. The resulting 170,000 year record indicates that sea-surface temperature varied between 25.5 and 28 degrees celsius, and that the Indian monsoon varied greatly throughout the end of the latest glacial period.

Composition, Paleoclimatology, Sea-water, Seawater, Paleoceanography

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