EGU22-7704, updated on 28 Mar 2022
EGU General Assembly 2022
© Author(s) 2022. This work is distributed under
the Creative Commons Attribution 4.0 License.

Late Holocene climate changes in the southern Yemen region based on a high-resolution biomarkers and ostracods record from the paleo-lake Gayal el Bazal

Shah Parth1, Ankit Yadav2, Ilaria Mazzini3, James Russell4, and Nicolas Waldmann1
Shah Parth et al.
  • 1Dr. Moses Strauss Department of Marine Geosciences, Charney School of Marine Sciences, University of Haifa, 3498838 Haifa, Israel (
  • 2Department of Earth and Environmental Sciences, Indian Institute of Science Education and Research Mohali, Mohali, India
  • 3Consiglio Nazionale delle Ricerche, IGAG, Area della Ricerca di Roma 1 - Montelibretti, Via Salaria km 29,300, 00015 Monterotondo (Rome), Italy
  • 4Department of Earth, Environmental and Planetary Sciences, Brown University, Providence, RI, USA

Gayal el Bazal is a karstic paleo-lake situated on the southern margin of the Arabian Desert, a climatic sensitive zone that responds to small-scale hydrological changes modulated by the Indian Ocean monsoon system. High-resolution biomarker and ostracods assemblages obtained from a 3.25 m composite core from the lake provides insight into past environmental changes for the last 1200 years. Moreover, variations in the sediment lithology and geochemical proxies from the lake core suggests fluctuations related to the dominating precipitation regime. Through data amalgamation, we identified two globally recognized events: the Medieval Climate Anomaly (MCA) and the Little Ice Age (LIA). The study shows that the n-alkane homologues exhibited different distribution modes during these different climatic stages, indicative of variation in the sources of organic matter in response to changes in the regional hydrological conditions. The climate reconstruction based on the n-alkane proxies (Paq, TAR) suggests a higher abundance of longer chain length carbons (C27-C35) derived from higher plants of the watershed during the MCA, indicating wetter conditions in the region. Furthermore, ostracods assemblage data also revealed Paracypretta amati abundance increases during the MCA and decreases during the LIA. The arid phase of LIA is also marked by gypsum formation and dust deposition and is consistent with evidence and theory for weakened summer monsoons during intervals of northern hemisphere cooling. Overall, this study aims to provide a better insight of the monsoon variability and to help to understand the role of northwards migrations of the Intertropical Convergence Zone (ITCZ) vis-à-vis monsoonal dynamics in the region.

How to cite: Parth, S., Yadav, A., Mazzini, I., Russell, J., and Waldmann, N.: Late Holocene climate changes in the southern Yemen region based on a high-resolution biomarkers and ostracods record from the paleo-lake Gayal el Bazal, EGU General Assembly 2022, Vienna, Austria, 23–27 May 2022, EGU22-7704,, 2022.


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