Umeå University's logo

umu.sePublications
Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Early to Middle Holocene hydroclimate changes in the Guern El Louläilet depressions, Algerian Sahara
Laboratoire de Paléontologie Stratigraphique et Paléoenvironnements, Université Mohamed Ben Ahmed, El-M’naouer, Oran, Algeria.ORCID iD: 0000-0002-1135-968X
Laboratoire de Paléontologie Stratigraphique et Paléoenvironnements, Université Mohamed Ben Ahmed, El-M’naouer, Oran, Algeria.
Umeå University, Faculty of Arts, Department of historical, philosophical and religious studies.
Department of Physical Geography, University of Stockholm, Stockholm, Sweden.
Show others and affiliations
2023 (English)In: Journal of Paleolimnology, ISSN 0921-2728, E-ISSN 1573-0417, Vol. 69, p. 161-183Article in journal (Refereed) Published
Abstract [en]

Fossil diatoms and litho-stratigraphic changes in the Guern El Louläilet depressions, NW of the Great Western Erg, Algeria, were analysed to infer paleoenvironmental changes in the northern Algerian Sahara during the Early and Middle Holocene. Analysis was based on calcareous diatomite collected from four outcrops within the depressions. The diatom flora consists of brackish and epiphytic taxa, such as Epithemia argus, with percentages of some freshwater and planktonic species, mainly Cyclotella distinguenda. Results provide evidence for two Holocene lacustrine episodes related to the African Humid Period. The first episode (Early to Middle Holocene) was characterized by abrupt development of shallow-water conditions, with extensive littoral zones and evaporative periods that coincided with high salt concentrations in warm, alkaline water (swampy conditions). A second episode (Middle to Late Holocene?), with brackish water and alkaline conditions, coincided with a decline in lake water level that is attributed to drier conditions. Our findings are consistent with those of other studies from the area and demonstrate similar environmental changes occurred after 9300 cal yr BP at sites within the region. The main drivers of the African Humid Period were the northward shift of the Intertropical Convergence Zone (ITCZ) and expansion of summer monsoonal rains. Our study sites were located in the northern Sahara, where variations in the position of the Intertropical Convergence Zone (ITCZ) did not affect rainfall. Early and Middle Holocene climate fluctuations detected in this study may have been caused by intensification of winter precipitation in the south-central Mediterranean and its penetration southward.

Place, publisher, year, edition, pages
Springer, 2023. Vol. 69, p. 161-183
Keywords [en]
Diatoms, Paleolakes, Great Western Erg, African Humid Period, Shallow lake, Holocene
National Category
Physical Geography
Research subject
Physical Geography; climate change
Identifiers
URN: urn:nbn:se:umu:diva-199336DOI: 10.1007/s10933-022-00267-4ISI: 000852117700001Scopus ID: 2-s2.0-85137767864OAI: oai:DiVA.org:umu-199336DiVA, id: diva2:1695461
Available from: 2022-09-13 Created: 2022-09-13 Last updated: 2023-06-08Bibliographically approved

Open Access in DiVA

No full text in DiVA

Other links

Publisher's full textScopus

Authority records

Katrantsiotis, Christos

Search in DiVA

By author/editor
Yahiaoui, NassimaKatrantsiotis, Christos
By organisation
Department of historical, philosophical and religious studies
In the same journal
Journal of Paleolimnology
Physical Geography

Search outside of DiVA

GoogleGoogle Scholar

doi
urn-nbn

Altmetric score

doi
urn-nbn
Total: 122 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf