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新疆博斯腾湖沉积岩芯揭示的全新世气候变化
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摘要
博斯腾湖是中国最大的内陆淡水湖,主要受到西风带来水汽的影响,其湖泊沉积物可以良好地记录西风区全新世气候变化过程。在前人研究的基础上,本文对博斯腾湖中心BST04H孔岩芯自生碳酸盐(细粒组分、介形虫)进行分析:在H孔已有的年代模式的基础上,分析细粒碳酸盐CaCO3%、碳氧稳定同位素、介形虫碳氧稳定同位素等指标的变化,重建了区域全新世以来的气候演化过程,并通过与本孔其他指标及本湖其他钻孔研究结果对比,得出以下结论:
     1.博斯腾湖H孔细粒碳酸盐可以代表湖泊自生碳酸盐;细粒碳酸盐氧同位素及介形虫壳体同位素主要反映了湖水同位素的变化,进而反映湖泊的入流蒸发比,细粒碳酸盐碳同位素主要反映了湖泊中CO2与大气中CO2的交换程度;细粒碳酸盐CaCO3%主要反映了湖泊的干湿状况,CaCO3%高时,湖泊收缩,反之,湖泊扩张;
     2.根据本文BST04H孔岩芯记录,博斯腾湖全新世以来湖泊演化过程可以分为以下几个阶段:
     10000~8300(cal yr BP):前期湖泊有短暂的积水,8300cal yr BP前后,湖泊开始快速积水,湖泊扩张,开始湖相沉积;8300~5000(cal yr BP):湖相沉积开始,湖泊处于一个稳定的阶段,湖泊缓慢积水,外来水源补给比较充足稳定:5000~3700(cal yr BP):湖泊开始收缩;3700~500(cal yr BP):湖泊经历一个快速的扩张过程后开始收缩,期间湖泊激烈扩张收缩,总体趋势上处于一个收缩的阶段;500~-49(cal yr BP):湖泊先扩张再收缩,幅度较大,人为影响不可忽略;
     3.与本孔其他指标及本湖其他钻孔研究结果对比表明,本研究所选用的气候代用指标对气候变化有明显的响应,对快速变化事件也有很好的记录。
Bosten Lake, the largest inland freshwater lake in China, is strongly influenced by westerly and the climatic changes during the Holocene could be preserved in the lake sediments. We carried out systematic analyses of lacustrine authigenic carbonate (fine carbonate and ostracod shells) on lake sediments from BST04H core. Based on the existing age model of BST04H, we reconstructed the regional climate and the lake status since early Holocene through comprehensive analyses of fine carbonate content, stable-isotopes of fine carbonate and ostracod shells. Compared with proxies from other cores in Bosten Lake by previous researches, our results reached the following conclusions:
     1. Fine carbonate could represent Lacustrine authigenic carbonate. Oxygen istopes of ostracod shells and fine carbonate is mainly a reflection of the isotopic composition of the host water, which is controlled by the precipitation (input water)/evaporation ratios.
     2. From 10000~8300 cal yr BP, the climate was dry, Bosten lake expanded and formed at 8300 cal yr BP; During the period 8300~5000 cal yr BP, the lake was in a stable stage, and the lake level was rising slowly; From 5000~3700 cal yr BP, a generally dry climate prevailed in the lake drainage; From 3700~500 cal yr BP, the lake level began to drop after a rapid rise; From 500~-49cal yr BP, the lake expended after a short period of shrink.
     3. There is consistency in the records from Bosten Lake between BST04H and other cores, and rapid climate changes have been well recorded. Differences between these cores may be due to differences in sampling locations, sample resolution, age models and proxy indicators.
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