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Tropical Climate Instability: The Last Glacial Cycle from a Qinghai-Tibetan Ice Core

机译:热带气候的不稳定性:青藏高原冰芯的最后一次冰川周期

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摘要

An ice core record from the Guliya ice cap on the Qinghai-Tibetan Plateau provides evidence of regional climatic conditions over the last glacial cycle. ~(36)Cl data suggest that the deepest 20 meters of the core may be more than 500,000 years old. The δ~(18)O change across Termination I is ~5.4 per mil, similar to that in the Huascaran (Peru) and polar ice cores. Three Guliya interstadials (Stages 3, 5a, and 5c) are marked by increases in δ~(18)O values similar to that of the Holocene and Eemian (~124,000 years ago). The similarity of this pattern to that of CH_4 records from polar ice cores indicates that global CH_4 levels and the tropical hydrological cycle are linked. The Late Glacial Stage record contains numerous 200-year oscillations in δ~(18)O values and in dust, NH_4~+, and NO_3~- levels.
机译:青藏高原古利雅冰盖的冰芯记录提供了最后一次冰川周期区域气候条件的证据。 〜(36)Cl数据表明,岩心最深的20米可能已有500,000多年的历史。终端I处的δ〜(18)O变化为每密耳5.4〜mil,类似于Huascaran(秘鲁)和极地冰芯的变化。三个古利亚层间(第3、5a和5c期)的特征是δ〜(18)O值增加,与全新世和Eemian(〜124,000年前)相似。这种模式与极地冰芯CH_4记录的相似性表明,全球CH_4的水平与热带水文循环之间存在联系。冰川晚期记录包含δ〜(18)O值和尘埃,NH_4〜+和NO_3〜-水平的200年振荡。

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