Tropical Climate Instability: The Last Glacial Cycle from a Qinghai-Tibetan Ice Core
Tropical Climate Instability: The Last Glacial Cycle from a Qinghai-Tibetan Ice Core
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DOI：
10.1126/science.276.5320.1821
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发表时间：
1997-06
期刊：
影响因子：
56.9
通讯作者：
L. Thompson;T. Yao;M. E. Davis;K. Henderson;E. Mosley‐Thompson;P. Lin;J. Beer;H. Synal;
中科院分区：
文献类型：
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作者：
L. Thompson;T. Yao;M. E. Davis;K. Henderson;E. Mosley‐Thompson;P. Lin;J. Beer;H. Synal;
青藏高原古里雅冰帽的一个冰芯记录提供了上一个冰川旋回区域气候条件的证据。³⁶Cl数据表明，该冰芯最深的20米可能超过50万年。Ⅰ期终止点的δ¹⁸O变化约为每千分5.4，与瓦斯卡兰（秘鲁）和极地冰芯的情况相似。古里雅的三个间冰段（第3阶段、5a阶段和5c阶段）的特征是δ¹⁸O值升高，与全新世和埃姆间冰期（约12.4万年前）相似。这种模式与极地冰芯的CH₄记录相似，表明全球CH₄水平与热带水文循环是相关联的。末次冰期的记录包含δ¹⁸O值以及尘埃、NH₄⁺和NO₃⁻含量的众多200年振荡。
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.