Ice core evidence for asynchronous glaciation on the Tibetan Plateau
Ice core evidence for asynchronous glaciation on the Tibetan Plateau
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DOI：
10.1016/j.quaint.2006.02.001
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发表时间：
2006-10
影响因子：
2.2
通讯作者：
L. Thompson;E. Mosley‐Thompson;M. Davis;T. Mashiotta;K. Henderson;P. Lin;Y. Tandong
中科院分区：
文献类型：
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作者：
L. Thompson;E. Mosley‐Thompson;M. Davis;T. Mashiotta;K. Henderson;P. Lin;Y. Tandong
在过去的20年里，从青藏高原（TP）的低纬度，高海拔冰原上系统地恢复了冰芯记录，每个冰芯都提供了有关区域气候和环境变化的新信息。从整体上看，这些冰芯历史提供了令人信服的证据，表明低纬度地区大型冰原的增长（冰川作用）和衰退（冰川消退）通常与米兰科维奇时间尺度上发生的高纬度冰川作用和冰川消退不同步。在这里，我们研究了青藏高原西北缘古里雅冰帽、藏中和沿着青藏高原南缘的普若岗日冰帽和大索普冰川冰芯记录的非同步冰川作用的证据。我们认为，虽然来自南极洲，格陵兰岛，坦桑尼亚，秘鲁和玻利维亚的稳定同位素记录表明，在末次冰期全球规模的冷却，在大部分TP降水是一个更强大的驱动程序的冰川作用。在这里，我们提出的证据表明，南部和中部TP的冰川扩张主要是由季风降水的变化，是由岁差驱动的日照变化调制。普若格朗日冰原和达索普冰原的基底（最古老的）冰沉积于全新世早期至中期，而古里亚冰原基底附近的冰则超过50万年。
Over the last two decades, ice core records have been systematically recovered from low-latitude, high-elevation ice fields from across the Tibetan Plateau (TP) and each core has provided new information about regional climate and environmental change. When viewed collectively, these ice core histories provide compelling evidence that the growth (glaciation) and decay (deglaciation) of large ice fields in the lower latitudes are often asynchronous with high-latitude glaciation and deglaciation that occur on Milankovitch time scales. Here, we examine the evidence for asynchronous glaciation on the TP as recorded in ice cores from the Guliya ice cap on the northwestern margin, and the Puruogangri ice cap and Dasuopu glacier in central Tibet and along the southern margin of the TP, respectively. We contend that although stable isotopic records from Antarctica, Greenland, Tanzania, Peru, and Bolivia suggest global-scale cooling during the last glacial stage, over much of the TP precipitation is a stronger driver of glaciation. Here, we present evidence suggesting that glacier expansion on the southern and central TP is driven mainly by variations in monsoonal precipitation that is modulated by precession-driven insolation changes. The basal (oldest) ice in the Puruograngri and Dasuopu ice fields was deposited in the early to mid-Holocene, while ice near the base of Guliya is more than 500,000yr old.