Beyerle, Urs; Rueedi, Joerg; Leuenberger, Markus; Aeschbach-Hertig, Werner; Peeters, Frank; Kipfer, Rolf; Dodo, Abdelkader (2003). Evidence for periods of wetter and cooler climate in the Sahel between 6 and 40 kyr BP derived from groundwater. Geophysical Research Letters, 30(4) American Geophysical Union 10.1029/2002GL016310
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Concentrations of noble gases, stable isotopes and 14C 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 temperature due to increased vegetation. Intense rainfall events and increased groundwater recharge are consistently indicated by stable isotope data and excess air concentrations, i.e., the component of dissolved atmospheric gases in excess of solubility equilibrium. This finding encourages the use of excess air as an additional, humidity-related climate indicator.
Item Type: |
Journal Article (Original Article) |
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Division/Institute: |
08 Faculty of Science > Physics Institute > Climate and Environmental Physics |
UniBE Contributor: |
Leuenberger, Markus |
Subjects: |
500 Science > 530 Physics |
ISSN: |
0094-8276 |
Publisher: |
American Geophysical Union |
Language: |
English |
Submitter: |
BORIS Import 2 |
Date Deposited: |
06 Sep 2021 11:01 |
Last Modified: |
02 Mar 2023 23:35 |
Publisher DOI: |
10.1029/2002GL016310 |
BORIS DOI: |
10.48350/158445 |
URI: |
https://boris.unibe.ch/id/eprint/158445 |
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