Abrupt change in tropical African climate linked to the bipolar seesaw over the past 55,000 years
Article first published online: 18 OCT 2007
Copyright 2007 by the American Geophysical Union.
Geophysical Research Letters
Volume 34, Issue 20, October 2007
How to Cite
2007), Abrupt change in tropical African climate linked to the bipolar seesaw over the past 55,000 years, Geophys. Res. Lett., 34, L20702, doi:10.1029/2007GL031240., , , , and (
- Issue published online: 18 OCT 2007
- Article first published online: 18 OCT 2007
- Manuscript Accepted: 19 SEP 2007
- Manuscript Revised: 4 SEP 2007
- Manuscript Received: 18 JUL 2007
- abrupt climate change;
- lacustrine sediment
 The tropics play a major role in global climate dynamics, and are vulnerable to future climate change. We present a record of East African climate since 55 ka, preserved in Lake Malawi sediments, that indicates rapid shifts between discrete climate modes related to abrupt warming (D-O) events observed in Greenland. Although the timing of the Malawi events cannot be determined exactly, our age model implies that they occur prior to their Greenland counterparts, consistent with southward excursions of the Intertropical Convergence Zone during Greenland stadials. The magnitude of each of the events recorded in Malawi sediments corresponds to the scale of the subsequent Greenland warming. This suggests that a tropical component of climate sets a template for abrupt high northern latitude climate fluctuations associated with the bipolar seesaw.