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

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)

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:

06 Sep 2021 11:01

Publisher DOI:

10.1029/2002GL016310

BORIS DOI:

10.48350/158445

URI:

https://boris.unibe.ch/id/eprint/158445

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