Paleoenvironmental reconstruction of Lake Van and Lake Erçek over the last millennium using varved sediments (Eastern Türkiye)

IF 1.8 3区地球科学 Q3 GEOGRAPHY, PHYSICAL Quaternary International Pub Date : 2024-10-26 DOI:10.1016/j.quaint.2024.10.013

Ayşegül Feray Meydan , Ivan Aleksandrovich Kalugin , Andrey Victorovich Darin , Valery Vasilevich Babich , Tatiana Ivanovna Markovich , Denis Yurevich Rogozin , M. Namık Çağatay , Erhan Gülyüz , Suna Akkol

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Abstract

Detailed lithological and geochemical studies of the bottom sediments were conducted based on the original sampling of brackish adjacent lakes: Lake Van and Lake Erçek in Eastern Anatolia, Türkiye. Seasonal variations in the accumulation of weather-driven element content were determined using high-resolution Synchrotron Radiation X-Ray Fluorescence (SR-XRF) analysis of the annual layers in the solid prepare. The results were utilized to approximate the regional paleo-temperature of both lakes and the water level of Lake Van. Visual counting of the varve as well as annual oscillation of measured geochemical series was employed to create a time scale. The element content series were synchronized with recent changes in external climatic environments and lake water level fluctuations. Subsequently, the geochemical series were transformed into climate units, using calibration on synchronous meteorological data. Finally, the original quantitative reconstruction of the regional climate variations was performed over the last millennium period with annual time resolution; for Lake Erçek (840 years ago) and Lake Van (1300 years ago). It was revealed that the sediments of these adjacent lakes (Lake Van and Lake Erçek), located 30 km apart from each other, provided synchronous responses to regional environmental changes, which confirmed the reliability of the reconstructions.

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利用变异沉积物重建Van湖和er ek湖近千年的古环境（东trkiye）

在基耶省东安纳托利亚的Van湖和er ek湖的原始样品的基础上，对底部沉积物进行了详细的岩性和地球化学研究。利用高分辨率同步辐射x射线荧光（SR-XRF）对固体制备中的年层进行分析，确定了天气驱动元素含量积累的季节变化。利用这一结果对两湖的区域古温度和凡湖的水位进行了近似。利用目视计数和地球化学测量序列的年振荡来建立时间尺度。元素含量序列与近年来外部气候环境变化和湖泊水位波动同步。随后，利用同步气象数据进行定标，将地球化学序列转化为气候单元。最后，以年分辨率对近千年的区域气候变化进行了原始的定量重建；埃尔帕雷切克湖（840年前）和凡湖（1300年前）。结果表明，相距30 km的Van湖和erek湖的沉积物对区域环境变化具有同步响应，证实了重建的可靠性。

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来源期刊

Quaternary International 地学-地球科学综合

CiteScore

5.60

自引率

4.50%

发文量

336

审稿时长

3 months

期刊介绍： Quaternary International is the official journal of the International Union for Quaternary Research. The objectives are to publish a high quality scientific journal under the auspices of the premier Quaternary association that reflects the interdisciplinary nature of INQUA and records recent advances in Quaternary science that appeal to a wide audience. This series will encompass all the full spectrum of the physical and natural sciences that are commonly employed in solving Quaternary problems. The policy is to publish peer refereed collected research papers from symposia, workshops and meetings sponsored by INQUA. In addition, other organizations may request publication of their collected works pertaining to the Quaternary.