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A window into Africa's past hydroclimates: the 2 SISAL_v1 database contribution 3

Braun, Kerstin; Nehme, Carole; Pickering, Robyn; Rogerson, Mike; Scroxton, Nick

Authors

Kerstin Braun kbraun2@asu.edu

Carole Nehme carole.nehme@univ-rouen.fr

Robyn Pickering

Nick Scroxton nscroxton@umass.edu

Abstract

Africa spans the hemispheres from temperate region to temperate region and has a long history of hominin evolution. Although the number of Quaternary palaeoclimatic records from the continent is increasing, much of the history of spatial and temporal climatic variability is still debated. Speleothems, as archives of terrestrial hydroclimate variability, can help reveal this history. Here we review the progress made to date, with a focus on the first version of the Speleothem Isotopes Synthesis and AnaLysis (SISAL) database. The geology of Africa has limited development of large karst regions to four areas: along the northern coast bordering the Mediterranean, eastern Africa and the Horn of Africa, southwestern Africa and southern Africa. Exploitation of the speleothem palaeoclimate archives in these regions is uneven, with long histories of research, e.g., in South Africa, but large areas with no investigations such as West Africa. Consequently, the evidence of past climate change reviewed here is irregularly sampled in both time and space. Nevertheless, we show evidence of migration of the monsoon belt, with enhanced rainfall during interglacials observed in northeast Africa, southern Arabia and the northern part of southern Africa. Evidence from eastern Africa indicates significant decadal and centennial scale rainfall variability. In northwestern and southern Africa, precession and eccentricity influence speleothem growth, largely through changing synoptic storm activity.

Journal Article Type Review
Publication Date Jan 23, 2019
Print ISSN 2571-550X
Publisher MDPI
Peer Reviewed Peer Reviewed
Volume 2
Issue 1
Article Number 4
Institution Citation Braun, K., Nehme, C., Pickering, R., Rogerson, M., & Scroxton, N. (2019). A window into Africa's past hydroclimates: the 2 SISAL_v1 database contribution 3. Quaternary, 2(1), https://doi.org/10.3390/quat2010004
DOI https://doi.org/10.3390/quat2010004
Keywords speleothem; hydroclimate; monsoon; ITCZ; SISAL; oxygen isotopes
Publisher URL https://www.mdpi.com/

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Copyright Statement
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).



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