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首页> 外文期刊>Paleoceanography >Five millennia of surface temperatures and ice core bubble characteristics from the WAIS Divide deep core, West Antarctica
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Five millennia of surface temperatures and ice core bubble characteristics from the WAIS Divide deep core, West Antarctica

机译：来自南极西部的WAIS Divide深层核心的五千年的地表温度和冰芯气泡特征

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摘要

Bubble number densities from the West Antarctic Ice Sheet (WAIS) Divide deep core in West Antarctica record relatively stable temperatures during the middle Holocene followed by late Holocene cooling. We measured bubble number density, shape, size, and arrangement on new samples of the main WAIS Divide deep core WDC06A from similar to 580m to similar to 1600 depth. The bubble size, shape, and arrangement data confirm that the samples satisfy the requirements for temperature reconstructions. A small correction for cracks formed after core recovery allows extension of earlier work through the brittle ice zone, and a site-specific calibration reduces uncertainties. Using an independently constructed accumulation rate history and a steady state bubble number density model, we determined a temperature reconstruction that agrees closely with other independent estimates, showing a stable middle Holocene, followed by a cooling of similar to 1.25 degrees C in the late Holocene. Over the last similar to 5 millennia, accumulation has been higher during warmer times by similar to 12%degrees C-1, somewhat stronger than for thermodynamic control alone, suggesting dynamic processes.
机译：来自南极西部冰盖（WAIS）的气泡数密度分布在中全新世，随后是晚全新世冷却期间，温度相对稳定。我们测量了WAIS Divide主深核WDC06A的新样品中的气泡数密度，形状，大小和排列，其深度从大约580m到大约1600m。气泡的大小，形状和排列数据确认样品满足温度重建的要求。对岩心恢复后形成的裂缝进行较小的校正，可以使较早的工作扩展到脆性冰区，并且特定地点的校准可以减少不确定性。使用独立构建的累积速率历史和稳态气泡数密度模型，我们确定了与其他独立估计值非常吻合的温度重建，显示出稳定的中全新世，随后在全新世末期冷却至1.25摄氏度。在最后一个类似于5千年的时期中，在较暖的时期，蓄积量增加了约12％C-1，比单独进行热力学控制时要强一些，表明存在动态过程。

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