HR: 08:45h
AN: PP31F-04    [Abstracts]
TI: Ecosystem Response to Dansgaard-Oeschger Climate Variability
AU: * Wohlfarth, B
EM: Barbara@geo.su.se
AF: Department of Geology and Geochemistry, Stockholm University, Stockholm, 10691, Sweden
AU: Veres, D
EM: Daniel.Veres@natgeo.su.se
AF: Department of Physical Geography and Quaternary Geology, Stockholm University, Stockholm, 10691, Sweden
AU: Ampel, L
EM: Linda.Ampel@natgeo.su.se
AF: Department of Physical Geography and Quaternary Geology, Stockholm University, Stockholm, 10691, Sweden
AB: Abrupt climate variability is a conspicuous feature seen in ice cores, marine sediments and speleothems, especially during marine isotope stage (MIS) 3. Corresponding changes have been observed in a number of terrestrial (lake sediment) archives, however clear evidence for a synchroneity of events and for the response of terrestrial ecosystems to these rapid changes remains ambiguous. Here we report on a multi-proxy study of the lake sediment sequence of Les Echets in France. We show that the lake ecosystem underwent profound cyclic changes alternating between time intervals of higher and lower lake organic productivity, which both resemble and differ from those seen in ice core and marine archives. Our results indicate that although ecosystem response to climate variability was rapid, it was modulated by local factors.
DE: 4901 Abrupt/rapid climate change (1605)
DE: 4926 Glacial
DE: 4942 Limnology (0458, 1845, 4239)
SC: Paleoceanography and Paleoclimatology [PP]
MN: 2007 Fall Meeting