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High Resolution Cyclostratigraphy During the Last Two Millennia Based on the Clayey Fraction Within the Mhabeul Wetland (Southeastern Tunisia)
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Author(s): Elhoucine Essefi (Faculty of Sciences of Sfax, University of Sfax, Tunisia)
Copyright: 2023
Pages: 18
Source title:
Climatic and Environmental Significance of Wetlands: Case Studies from Eurasia and North Africa
Source Author(s)/Editor(s): Abdelkrim Ben Salem (Faculty of Sciences, Mohammed V University, Rabat, Morocco), Laila Rhazi (Faculty of Sciences, Mohammed V University, Rabat, Morocco)and Ahmed Karmaoui (Moulay Ismail University of Meknes, Morocco & Moroccan Center for Culture and Science, Morocco)
DOI: 10.4018/978-1-7998-9289-2.ch008
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Abstract
High-resolution proxy-based paleoenvironmental records derived from wetlands provide important insights into climate changes over centennial to millennial timescales. This work aims to study the climatic cyclicity of the clayey fraction along a 78 cm core from the saline system of Mhabeul, located in Southeastern Tunisia. Based on the age model of Essefi et al., the core covers the last two millennia (»2100 yr). A high-resolution sampling of 2mm was carried out to obtain 380 samples evenly distributed along the core. In terms of analyses, the cumulative curve of the grain size distribution carried out by Fritsch laser apparatus percentages of the Clayey fraction underwent the spectral analysis. Based on the spectral analysis, millennial cycles of » 2500 yr, and 1000 yr are related to solar forcing. Solar irradiation is most likely responsible for the cyclic characteristics at 500 yr (600 yr) frequency.
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