Use of the magnetic, geochemical, and sedimentary records in establishing paleoclimate change in the environment of Sebkha: Case of the Sebkha Mhabeul in southeastern Tunisia
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引用次数: 6
Abstract
In this study, we explored the evidence of late Holocene climate changes in southern Tunisia, examining extreme events of flood and sandstorm sedimentary succession records, in Sebkha Mhabeul. A sediment-derived climatic proxy was inferred from a 93.5-cm-deep core (Mh1), whose dating by tephrochronology has already been achieved in previous works. Multiple geochemical, sedimentological, magnetic susceptibility, and quartz grain microtexture proxies were used to determine the shifts in regional climatic conditions. The Sebkha core captured sensitive changes in the precipitation/evaporation (P/E) balance by adjustments in salinity, and is especially valuable for reconstructing variability over centennial timescales. The Sebkha Mhabeul area showed higher salinity during the Roman Warm Period (RWP: 2100–1400 cal yr BP), the Medieval Warm Period (MWP: 1000–600 cal yr BP) and the present era, and generally lower salinity during the Dark Ages (DA: 1400-1000 cal yr BP) and the Little Ice Age (LIA: 600-200 cal yr BP).
In southeastern Tunisia, the hydrological behavior was sometimes consistent with the flood activities in the eastern Mediterranean, and sometimes contemporaneous with the flood pulsations of the western Mediterranean.
在这项研究中,我们探索了突尼斯南部全新世晚期气候变化的证据,研究了Sebkha Mhabeul地区洪水和沙尘暴沉积序列记录的极端事件。从一个93.5 cm深的岩芯(Mh1)中推断出一个沉积物衍生的气候代用物,该岩芯的温度年代学定年在以前的工作中已经实现。利用地球化学、沉积学、磁化率和石英颗粒显微结构等多种指标确定了区域气候条件的变化。Sebkha岩心通过盐度调整捕获了降水/蒸发(P/E)平衡的敏感变化,对于重建百年时间尺度上的变化尤其有价值。Sebkha Mhabeul地区在罗马暖期(RWP: 2100 ~ 1400 cal yr BP)、中世纪暖期(MWP: 1000 ~ 600 cal yr BP)和现代盐度较高,在黑暗时代(DA: 1400 ~ 1000 cal yr BP)和小冰期(LIA: 600 ~ 200 cal yr BP)盐度普遍较低。在突尼斯东南部,水文行为有时与地中海东部的洪水活动一致,有时与地中海西部的洪水脉动同时发生。
期刊介绍:
Created in 1835 by physicist François Arago, then Permanent Secretary, the journal Comptes Rendus de l''Académie des sciences allows researchers to quickly make their work known to the international scientific community.
It is divided into seven titles covering the range of scientific research fields: Mathematics, Mechanics, Chemistry, Biology, Geoscience, Physics and Palevol. Each series is led by an editor-in-chief assisted by an editorial committee. Submitted articles are reviewed by two scientists with recognized competence in the field concerned. They can be notes, announcing significant new results, as well as review articles, allowing for a fine-tuning, or even proceedings of symposia and other thematic issues, under the direction of invited editors, French or foreign.