[张贴报告]Climatic and environmental change in the western Tibetan Plateau during the Holocene, recorded by lake sediments from Aweng Co

Climatic and environmental change in the western Tibetan Plateau during the Holocene, recorded by lake sediments from Aweng Co
编号：1098 稿件编号：3686 访问权限：私有 更新：2023-04-09 20:36:15 浏览：151次 张贴报告

报告开始：2023年05月06日 08:00 （Asia/Shanghai）

报告时间：0min

所在会议：[SP] 张贴报告专场 » [SP-1-1] 1、第四纪地质与全球变化

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摘要
Understanding the strength and extent of the Asian summer monsoon (including the East Asian summer monsoon and the Indian summer monsoon) in the Tibetan Plateau (TP) region is crucial for predicting possible changes in the regional eco-environment and water resources under global warming. Due to the lack of well-dated and high-resolution paleoclimate records, long-term monsoon dynamics are still not well understood in the western TP, which is currently influenced by both the Indian summer monsoon (ISM) and the westerlies. Here we present a multi-proxy lacustrine record covering the past 10,500 years from Aweng Co, an alpine lake at the northern limit of the modern ASM in western Tibet. Our results show that the western TP was mainly controlled by the ISM during the Holocene and the regional ecosystem/environment was sensitive to climate change. The climate was the wettest between 10.5-7.3 cal. kyr BP, when terrestrial plants in the catchment were productive and the biomass of benthic algae was low possibly due to limited sunlight at the lake bottom due to high lake level. From 7.3 to 5.0 cal. kyr BP the climate shifted towards drier conditions, resulting in a decline in terrestrial plant cover. Between 5.0 and 3.1 cal. kyr BP, the climate became even drier, resulting in a further decline in vegetation cover in the catchment. Between 4.6 and 3.1 cal. kyr BP, 100% endogenic dolomite precipitated from the lake water, possibly induced by high Mg/Ca ratios. After 3.1 cal. kyr BP, the climate was the driest and frequent centennial-scale droughts occurred. The lake level was low and would have resulted in more light reaching the lake bottom, favoring the growth of benthic algae. The reconstructed lake level change of Aweng Co  agrees well with the paleo-shoreline records in the southern TP, demonstrating that the ISM evolution played a key role in lake hydrological processes in this region. A comparison of paleoclimate records shows the ISM reached 34.5° N in the western TP during the Holocene.
关键字
Indian summer monsoon, paleoclimate, lake level, stable isotopes, ostracods
报告人
ZhangYuzhi
山西财经大学

稿件作者
ZhangYuzhi 山西财经大学
ZhangJiawu 兰州大学
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徐 鹏（13554674258；xupengwhu@whu.edu.cn）
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王伦澈（13349889828；wang@cug.edu.cn）
庄艳华（13349889826；zhuang@apm.ac.cn）
李星华（15527964369；lixinghua5540@whu.edu.cn）
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管小彬（18007973663；guanxb@whu.edu.cn）
赵 林（18071070948；linzhao@whu.edu.cn）
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