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Evidence for periods of wetter and cooler climate in the Sahel between 6 and 40 kyr BP derived from groundwater
 

Summary: Evidence for periods of wetter and cooler climate in the Sahel between
6 and 40 kyr BP derived from groundwater
Urs Beyerle,1
Joerg Rueedi, and Markus Leuenberger
Climate and Environmental Physics, Physics Institute, University of Bern, Switzerland
Werner Aeschbach-Hertig,2
Frank Peeters, and Rolf Kipfer3
Water Resources and Drinking Water, EAWAG, Du¨bendorf, Switzerland
Abdelkader Dodo
De´partement de Ge´ologie, Universite´ Abdou Moumouni, Niamey, Niger
Received 20 September 2002; revised 22 November 2002; accepted 2 January 2003; published 22 February 2003.
[1] Concentrations of noble gases, stable isotopes and 14
C
in samples from the Continental Terminal groundwaters
of Niger provide evidence for more humid and cooler climate
phases in West Africa in the Holocene and the
late Pleistocene. During humid phases, even within the
Holocene, the soil temperature was up to 5.5°C cooler than
today, which is partly attributed to atmospheric cooling,
but also to a change in the relationship between air and soil

  

Source: Aeschbach-Hertig, Werner - Institut für Umweltphysik, Universität Heidelberg

 

Collections: Geosciences; Environmental Sciences and Ecology