Holocene climate development on the central Tibetan Plateau: A sedimentary record from Cuoe Lake
Holocene climate development on the central Tibetan Plateau: A sedimentary record from Cuoe Lake
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DOI：
10.1016/j.palaeo.2005.09.017
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发表时间：
2006-05
期刊：
影响因子：
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通讯作者：
Wu Yanhong;A. Lücke;Jin Zhangdong;Wang Sumin;G. Schleser;R. Battarbee;Xia Weilan
中科院分区：
文献类型：
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作者：
Wu Yanhong;A. Lücke;Jin Zhangdong;Wang Sumin;G. Schleser;R. Battarbee;Xia Weilan
我们提出了一个西藏中部的气候记录跨越10500和1600卡年BP之间的时间从5.3米长的沉积物芯从措俄湖。分析表明，高Sr、高TOC、高C/N比和δ 13 C富集的湖泊沉积物对应着较强的化学风化作用、较高的生产力、较高的湖平面和较温暖湿润的气候，反之亦然。这些指标的变化表明，这一时期的气候演化可分为五个阶段和几个亚阶段。10140 ~ 8560 cal BP是一个过渡阶段，是一个最佳阶段8560 ~ 5750 cal BP为暖/湿阶段，5750 ~ 4000 cal BP为凉/干阶段，4000 ~ 3000 cal BP的过渡阶段和3000 cal BP后的干涸阶段。这些变化可能反映了印度季风强度的变化，根据这种解释，印度季风强度应该从8560 cal年BP开始增强，在5750 cal年BP后略有减弱，自3000 cal年BP以来逐渐减弱。
We present a climate record for central Tibet spanning the time between 10500 and 1600 cal years BP from a 5.3-m-long sediment core from Cuoe Lake. The analyses show that high Sr concentration, high TOC content, high C/N ratio and enriched δ13C of lake sediments corresponded to stronger chemical weathering, high productivity, high lake level and warmer/wetter climate and vice versa. As revealed by the variations of these proxies, the climatic evolution during this period can be divided into five stages and several substages. These are a cold/dry stage before 10140 cal years BP, a transition stage from 10140 to 8560 cal years BP, an optimum stage (warm/wet) from 8560 to 5750 cal years BP, a cool/dry stage from 5750 to 4000 cal years BP, a transition stage from 4000 to 3000 cal years BP and a drying-up stage after 3000 cal years BP. These changes are presumably reflections of variations in Indian monsoon intensity which, according to that interpretation, should have been enhanced from 8560 cal years BP, slightly weakened after 5750 cal years BP, and gradually diminished since 3000 cal years BP in this region.