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Originally published in Science Express on 2 December 2004
Science 24 December 2004:
Vol. 306. no. 5705, pp. 2236 - 2239
DOI: 10.1126/science.1102490
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Reports

Asynchronous Terrestrial and Marine Signals of Climate Change During Heinrich Events

Tim C. Jennerjahn,1* Venugopalan Ittekkot,1 Helge W. Arz,2 Hermann Behling,3 Jürgen Pätzold,3 Gerold Wefer3

Tropical regions have been reported to play a key role in climate dynamics. To date, however, there are uncertainties in the timing and the amplitude of the response of tropical ecosystems to millennial-scale climate change. We present evidence of an asynchrony between terrestrial and marine signals of climate change during Heinrich events preserved in marine sediment cores from the Brazilian continental margin. The inferred time lag of about 1000 to 2000 years is much larger than the ecological response to recent climate change and appears to be related to the nature of hydrological changes.

1 Zentrum für Marine Tropenökologie, Fahrenheitstrasse 6, D-28359 Bremen, Germany.
2 GeoForschungs-Zentrum Potsdam, Telegrafenberg, 14473 Potsdam, Germany.
3 Deutsche Forschungsgemeinschaft (DFG) Forschungszentrum Ozeanränder (RCOM), Klagenfurter Strasse, 28359 Bremen, Germany.

* To whom correspondence should be addressed. E-mail: tim.jennerjahn{at}zmt-bremen.de

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Science. ISSN 0036-8075 (print), 1095-9203 (online)