South Atlantic island record reveals a South Atlantic response to the 8.2 kyr event K. Ljung1, S. Björck1, H. Renssen2, and D. Hammarlund1 1Geobiosphere Science Centre, Department of Geology, Quaternary Sciences, Lund University, Sölvegatan 12, 223 62 Lund, Sweden 2Faculty of Earth and Life Sciences, Vrije Universiteit Amsterdam, De Boelelaan 1085, 1081 HV Amsterdam, The Netherlands
Abstract. One of the most distinct climate fluctuations during the Holocene is the
short and rapid event centred around 8200 years ago, the 8.2 kyr event,
which was most likely triggered by glacial melt-water forcing from the
receding Laurentide ice-sheet. Evidence for this cooling has primarily been
reported from sites around the North Atlantic, but an increasing number of
observations imply a more wide-spread occurrence. Palaeoclimate archives
from the Southern Hemisphere have hitherto failed to uncover a distinct
climatic anomaly associated with the 8.2 kyr event. Here we present a lake
sediment record from Nightingale Island in the central South Atlantic
showing enhanced precipitation between 8275 and 8025 cal. yrs BP, most
likely as a consequence of increased sea surface temperature (SST). We show
that this is consistent with climate model projections of a warming of the
South Atlantic in response to reduced north-ward energy transport during the
8.2 kyr event.
Citation: Ljung, K., Björck, S., Renssen, H., and Hammarlund, D.: South Atlantic island record reveals a South Atlantic response to the 8.2 kyr event, Clim. Past, 4, 35-45, doi:10.5194/cp-4-35-2008, 2008.