Citation:

j.quascirev.2018.11.017

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Abstract:

Over the last four decades of palaeoclimate research, significant emphasis has been placed on the Last Glacial Maximum (LGM) spanning 26.5-19 thousand years ago (ka), a period that saw significant (~125 m) sea-level reductions and major ice caps adorning large parts of the Northern Hemisphere. Here, we present evidence for another major glacial period spanning 71-59 ka (Marine Isotope Stage 4: MIS4) from a well-dated marine sequence offshore South Australia. The astronomically-tuned chronology of this deep-sea core is confirmed using single-grain optically stimulated luminescence dating (OSL), providing confidence in our high-resolution age model. Our approach to the study of our MD03-2607 core has been to employ many different proxies. These are: d18O of both planktic and benthic foraminifera for stratigraphic purposes, faunal counts of planktonic foraminifera to reconstruct the position of oceanic fronts and currents, alkenone palaeothermometry, XRF core scanning to determine the presence of aeolian dust, and eNd isotope to identify fluvial discharge over the core site. We compare our proxy findings with other archives for mainland Australia and Tasmania.

Our multi-proxy palaeoclimate reconstructions are consistent with other marine, terrestrial and cryosphere archives across the Southern Hemisphere and suggest, for the first time, that MIS 4 was almost as dramatic as the LGM. During MIS4, global sea-level was reduced by ~100 m, glaciers across Australasia were more significant compared to the LGM, and sea-surface temperatures were much reduced. These glacial conditions uniformly peaked around 65ka. Global comparisons show major glacial conditions and vegetation shifts elsewhere during MIS4, but many are poorly dated. The significant environmental changes taking place during this glacial period were paralleled by waves of human dispersal across Eurasia and the earliest evidence of human occupation in northern Australia at 65ka.

Source:

Calculations of the deuterium excess [dln] calculated by R. Uemura for the EPICA Dome C data originally presented by B. Stenni et al. (2010) used in De Deckker et al., 2018

Chemical and temperature temperatures in a Tasmanian speleothem provided by Dr Albert Goede used in De Deckker et al., 2018

Further details:

Albert, Goede; McCulloch, Malcolm T; McDermott, Frank; Hawkesworth, Chris J (1998): Aeolian contribution to strontium and strontium isotope variations in a Tasmanian speleothem. Chemical Geology, 149, 37-50

Stenni, Barbara; Masson-Delmotte, Valerie; Selmo, Enricomaria; Oerter, Hans; Meyer, Hanno; Röthlisberger, Regine; Jouzel, Jean; Cattani, Olivier; Falourd, Sonia; Fischer, H; Hoffmann, G; Iacumin, P; Johnsen, Sigfús Jóhann; Minster, Bénédicte; Udisti, Roberto (2010): The deuterium excess records of EPICA Dome C and Dronning Maud Land ice cores (East Antarctica). Quaternary Science Reviews, 29(1-2), 146-159, https://doi.org/10.1016/j.quascirev.2009.10.009

Project(s):

International Marine Global Change Study (IMAGES)

Coverage:

Latitude: -36.960700 * Longitude: 137.406500

Date/Time Start: 2003-02-20T19:33:00 * Date/Time End: 2003-02-20T19:33:00

License:

Creative Commons Attribution 4.0 International (CC-BY-4.0)

Size:

2 datasets

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Datasets listed in this publication series

De Deckker, P; Arnold, L; van der Kaars, S et al. (2018): Faunal counts of planktonic foraminifera from sediment core MD03-2607. https://doi.org/10.1594/PANGAEA.896301
De Deckker, P; Arnold, L; van der Kaars, S et al. (2018): Proxies analysis from sediment core MD03-2607. https://doi.org/10.1594/PANGAEA.896294