高海拔干旱区湖泊沉积物多指标记录的环境变化研究——以阿克赛钦湖为例

doi:10.12118/j.issn.1000–6060.2021.295

Abstract

Abstract:

Lake Aksayqin, a typical large high-altitude lake located in the arid area of the northwestern Tibetan Plateau in China, is ideal for studying the changes in the Westerlies and Indian Summer Monsoon and the interplay between them. To reconstruct the paleoclimate changes of the lake, a 5.31 m long lake sediment core (AKLC15-1) was obtained at a water depth of 16.40 m. The grain size characteristics of the lake core were analyzed to investigate the hydrodynamics and lake-level changes. Based on the changes of multiple indicators, such as grain size results, total inorganic carbon, total organic carbon, total nitrogen, and magnetic susceptibility, we primarily discuss the changes in the lake environment, such as hydrodynamic transport conditions, lake surface changes, and cold and warm changes in the lake area under different sedimentary depths. The results show that the Lake Aksayqin area experiences a high rate of evaporation; the lake water is mainly supplied by glacier meltwater; and the organic matter content in lake sediments is low and mainly comes from endogenous aquatic organisms. The sediments of Lake Aksayqin are mainly composed of silt (70.48%), clay (27.64%), and sand (1.88%). The environmental change can be roughly divided into four stages. The first stage (531-480 cm) has a relatively warm climate, weakening evaporation in the basin, low aquatic productivity of the lake, and a deep-water environment with weak hydrodynamic transport conditions. In the second stage (480-380 cm), the climate is cold and dry, the evaporation in the basin is extremely strong, and the aquatic productivity of the lake is relatively high, which is a shallow water environment with strong hydrodynamic transport conditions. In the third stage (380-160 cm), the climate gradually warms. The amount of water entering the lake increases, the lake surface expands, and the hydrodynamic transport conditions of the lake gradually weaken. The fourth stage (160-0 cm) has a cold and dry climate with enhanced evaporation of the basin. The productivity of the lake is low; it has a deep-water environment with weak hydrodynamic transport conditions. This study will provide basic scientific data and theoretical support for reconstructing climatic changes and the relationship between the Westerlies and Indian Summer Monsoon in the northwestern Tibetan Plateau.

Key words: multiple indicators, Lake Aksayqin, environmental changes, lake sediment, Tibetan Plateau

XIANG Chaosheng,WANG Yong,WANG Junbo,MA Qingfeng,WANG Shihang. Environmental changes recorded by multiproxy of lake sediments in the high-altitude and arid area: A case of Lake Aksayqin[J].Arid Land Geography, 2022, 45(2): 435-444.

Figures/Tables 4

References 46

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