Affiliation:
1. Faculty of Sciences of Sfax, University of Sfax, Tunisia
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.
Reference40 articles.
1. Cyclostratigraphic studies of sediments from Lake Van (Turkey) based on their uranium contents obtained from downhole logging and paleoclimatic implications
2. Persistent Solar Influence on North Atlantic Climate During the Holocene
3. Bond, G., Showers, W., Cheseby, M., Lotti, R., Almasi, P., DeMenocal, P., ... & Bonani, G. (1997). A pervasive millennial-scale cycle in North Atlantic Holocene and glacial climates. Science, 278(5341), 1257-1266.
4. The role of the solar cycle in the relationship between the North Atlantic Oscillation and Northern Hemisphere surface temperatures
5. DebretM.Bout-RoumazeillesV.GroussetF.DesmetM.McManusJ. F.MasseiN.TrentesauxA. (2007). The origin of the 1500-Essefi, E. (2021). Apport des Approches Géochimique et Sédimentologique au Fonctionnement des Systèmes Endoréiques et Exoréiques de l’Holocène à l’Anthropocène: Intérêts Environnemental et Géoéconomique [Contribution of Geochemical and Sedimentological Approaches to the Functioning of Endorheic and Exoreic Systems from the Holocene to the Anthropocene: Environmental and Geoeconomic Interests]. Institut Supérieur des Sciences et Techniques des Eaux de Gabès.