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Climate of the Past An interactive open-access journal of the European Geosciences Union
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Volume 12, issue 1 | Copyright

Special issue: Human–land–sea interactions in the Mediterranean...

Clim. Past, 12, 1-14, 2016
https://doi.org/10.5194/cp-12-1-2016
© Author(s) 2016. This work is distributed under
the Creative Commons Attribution 3.0 License.

Research article 15 Jan 2016

Research article | 15 Jan 2016

Evidence of a prolonged drought ca. 4200 yr BP correlated with prehistoric settlement abandonment from the Gueldaman GLD1 Cave, Northern Algeria

J. Ruan1,5, F. Kherbouche2, D. Genty1, D. Blamart1, H. Cheng3,4, F. Dewilde1, S. Hachi2, R. L. Edwards4, E. Régnier1, and J.-L. Michelot5 J. Ruan et al.
  • 1Laboratoire des Sciences du Climat et de l'Environnement, Gif-sur-Yvette, France
  • 2Centre National de Recherches Préhistoriques, Anthropologiqes et Historiques, Algiers, Algeria
  • 3Institute of Global Environmental Change, Xi'an Jiaotong University, Xi'an, China
  • 4Department of Geological Sciences, University of Minnesota, Minnesota, USA
  • 5Laboratoire Géosciences Paris Sud, UMR 8148, Université Paris-Sud, Orsay, France

Abstract. Middle Holocene cultures have been widely studied around the Eastern-Mediterranean basin in the last 30years and past cultural activities have been commonly linked with regional climate changes. However, in many cases such linkage is equivocal, in part due to existing climatic evidence that has been derived from areas outside the distribution of ancient settlements, leading to uncertainty from complex spatial heterogeneity in both climate and demography. A few high-resolution well-dated paleoclimate records were recently established using speleothems in the Central and Eastern-Mediterranean basin, however, the scarcity of such records in the western part of the Mediterranean prevents us from correlating past climate evolutions across the basin and deciphering climate–culture relation at fine timescales.

Here we report the first decadal-resolved Mid-Holocene climate proxy records from the Western-Mediterranean basin based on the stable carbon and oxygen isotopes analyses of two U/Th dated stalagmites from the Gueldaman GLD1 Cave in Northern Algeria. Comparison of our records with those from Italy and Israel reveals synchronous (multi) centennial dry phases centered at ca. 5600, ca. 5200 and ca. 4200yrBP across the Mediterranean basin. New calibrated radiocarbon dating constrains reasonably well the age of rich anthropogenic deposits (e.g., faunal remains, pottery, charcoal) excavated inside the cave, which allows the comparison between in situ evidence of human occupation and of climate change. This approach shows that the timing of a prolonged drought at ca. 4400–3800yrBP blankets the onset of cave abandonment shortly after ca. 4403calyrBP, supporting the hypothesis that a climate anomaly may have played a role in this cultural disruption.

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