Talk by Ellen Corrick & Russell Drysdale – Københavns Universitet

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Center for Is og Klima > Kalender > 2017 calendar > Local Calendar > Talk by Ellen Corrick ...

Talk by Ellen Corrick & Russell Drysdale

Russell Drysdale (University of Melbourne, Australia)

Title: The speleothem record of the Younger Dryas termination

Millennial climate changes were a relatively persistent feature of the last glacial period, and culminated with the Younger Dryas termination (YDt) at the last glacial-interglacial transition. An important question regarding millennial events is their phasing across the globe. Speleothems, with their ability to be dated with high precision using U-Th methods, provide a means by which to test the synchronicity of climate changes across the YDt. This presentation will explore speleothem records from sites spanning Europe, North and South America, and the Asian/Indo-Australian Monsoon domain. Whilst few records are sufficiently well dated to provide meaningful comparisons, high-quality published data from Hulu and Kulishi Caves (China) are compared with new high-resolution data from Liang Luar Cave (Flores, eastern Indonesia) and Forbes Inferno Cave (Riversleigh, northern Australia) to shed light on the synchronicity of this event from Greenland to the extensive monsoon domain that straddles the equatorial Indo-Pacific. 

Ellen Corrick (PhD student, School of Geography, University of Melbourne, Australia,
Laboratoire EDYTEM, Université Savoie Mont Blanc, France)

Title: Investigating the synchrony and precise timing of Last Glacial millennial-scale climate events using speleothem palaeoclimate records.

Millennial-scale climate events are a well-known feature of the climate of the Last Glacial period. The characteristic pattern of stadial-to-interstadial change that is seen in Greenland ice-core records is also evident in numerous marine and terrestrial records spanning a wide geographic area. However, the extent to which these changes are in-phase across different climate regions has yet to be tested in a systematic and robust way. In this presentation, I will discuss a comparison of the timing of the onset of interstadial conditions in 68 individual speleothem records. Speleothems are ideal for investigating patterns in the global expression and timing of millennial-scale climate events as they can be dated very precisely and are widely distributed. Synchronous timing of interstadial event onset is seen for many events between the Asian and South American Summer Monsoon domains and Europe, suggesting that the events were rapidly propagated between these regions. The compilation of multiple speleothem records enables us to produce very precise ages for the timing of millennial-scale climate events which have the potential to be used to improve the Greenland ice-core chronology. I will also discuss other patterns in the timing and expression of events, and compare the timing of the events to the Greenland ice-core chronology.