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CP | Articles | Volume 15, issue 6
Clim. Past, 15, 1939–1958, 2019
https://doi.org/10.5194/cp-15-1939-2019
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
Clim. Past, 15, 1939–1958, 2019
https://doi.org/10.5194/cp-15-1939-2019
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 15 Nov 2019

Research article | 15 Nov 2019

A South Atlantic island record uncovers shifts in westerlies and hydroclimate during the last glacial

Svante Björck et al.

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Cited articles

Ahn, J. and Brook, E. J.: Siple Dome ice reveals two modes of millennial CO2 change during the last ice age, Nat. Commun., 5, 3723, https://doi.org/10.1038/ncomms4723, 2014. 
Andersen, K. K., Svensson, A., Johnsen, S., Rasmussen, S. O., Bigler, M., Röthlisberger, R., Ruth, U., Siggaard-Andersen, M. L., Steffensen, J. P., Dahl-Jensen, D., Vinther, B. M., and Clausen, H. B.: The Greenland Ice Core Chronology 2005, 15–42 ka. Part 1: Constructing the time scale, Quaternary Sci. Rev. 25, 3246–3257, https://doi.org/10.1016/j.quascirev.2006.08.002, 2006. 
Anker Björk, A., Björck, S., Cronholm, A., Haile, J., Ljung, K., and Porter, C.: Possible Late Pleistocene volcanic activity on Nightingale Island, South Atlantic ocean, based on geoelectrical resistivity measurements, sediment corings and 14C dating, GFF, 133, 1–7, https://doi.org/10.1080/11035897.2011.618275, 2011. 
Bard, E. and Rickaby, R. E. M.: Migration of the subtropical front as a modulator of glacial climate, Nature, 460, 380–383, https://doi.org/10.1038/nature08189, 2009. 
Barker, S. and Diz, P.: Timing of the descent into the last Ice Age determined by the bipolar seesaw, Paleoceanography, 29, 489–507, https://doi.org/10.1002/2014PA002623, 2014. 
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Short summary
Southern Hemisphere westerlies play a key role in regulating global climate. A lake sediment record on a mid-South Atlantic island shows changes in the westerlies and hydroclimate 36.4–18.6 ka. Before 31 ka the westerlies shifted in concert with the bipolar seesaw mechanism in a fairly warm climate, followed by southerly westerlies and falling temperatures. After 27.5 ka temperatures dropped 3 °C with drier conditions and with shifting westerlies possibly triggering the variable LGM CO2 levels.
Southern Hemisphere westerlies play a key role in regulating global climate. A lake sediment...
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