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Science 28 November 2008:
Vol. 322. no. 5906, p. 1326
DOI: 10.1126/science.1163381
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Technical Comments

Comment on "Climate-Driven Ecosystem Succession in the Sahara: The Past 6000 Years"

Victor Brovkin1* and Martin Claussen1,2

Kröpelin et al. (Research Articles, 9 May 2008, p. 765) interpreted a sediment record from Lake Yoa in the east-central part of North Africa as support for a weak biogeophysical climate-vegetation feedback in the Sahara during the mid-Holocene. We argue that the new data do not invalidate earlier modeling results on strong land-atmosphere coupling in the Western Sahara for which the Lake Yoa record is far less representative.

1 Max Planck Institute for Meteorology, Bundesstraße 55, 20146 Hamburg, Germany.
2 Meteorological Institute, University of Hamburg, Bundesstraße 55, 20146 Hamburg, Germany.

* To whom correspondence should be addressed. E-mail: victor.brovkin{at}zmaw.de

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