Electrical conductivity measurements from the GISP2 and GRIP Greenland ice cores
Electrical conductivity measurements from the GISP2 and GRIP Greenland ice cores
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DOI：
10.1038/366549a0
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发表时间：
1993-12
期刊：
影响因子：
64.8
通讯作者：
Kendrick C. Taylor;C. Hammer;R. Alley;H. Clausen;D. Dahl-Jensen;A. Gow;N. Gundestrup;J. Kipfstuh;John C. Moore;John C. Moore;E. Waddington
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文献类型：
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作者：
Kendrick C. Taylor;C. Hammer;R. Alley;H. Clausen;D. Dahl-Jensen;A. Gow;N. Gundestrup;J. Kipfstuh;John C. Moore;John C. Moore;E. Waddington
冰川冰的直流电导率取决于其酸度1 -3，也可以指示气候的变化，因为在寒冷多尘时期形成的冰具有高浓度的碱性粉尘1，4，5，与温暖少尘时期相比，这显著降低了电导率6，7。在这里，我们提出了格陵兰冰盖项目2（GISP 2）和格陵兰冰芯项目（GRIP）冰芯的电导率记录，钻28公里，使结果的直接比较。这两个记录的上半部分与之前来自其他格陵兰岩心的证据一致，即全新世期间格陵兰气候稳定，以及一系列温暖事件打断了末次冰期。然而，在底部10%的岩芯中，这两个记录之间存在显著差异，这对最近关于末次间冰期4，8和倒数第二次冰期8气候变化的报告提出了质疑。在这个阶段，要说到底是什么导致了这种差异还为时过早，尽管冰流可能给记录带来了一些不连续性。需要进一步开展工作，以确定最终能够从两个岩芯的下部提取多少气候信息。
THE direct-current electrical conductivity of glacial ice depends on its acidity1–3, and can also indicate changes in climate, as ice formed in cold, dusty periods has a high concentration of alkaline dust1,4,5, which significantly reduces the conductivity6,7compared to warmer, less dusty periods. Here we present electrical conductivity records for the Greenland Ice Sheet Project 2 (GISP2) and Greenland Ice-core Project (GRIP) ice cores, drilled 28 km apart to enable direct comparison of the results. The upper parts of both records are consistent with previous evidence from other Greenland cores4,8–12for a stable Greenland climate during the Holocene, and a series of warm events punctuating the last glacial period. However, there is a significant discrepancy between the two records in the bottom 10% of the cores, calling into question recent reports of climate variability in the last interglacial4,8and the penultimate glaciation8. At this stage, it is too early to say what exactly is causing the discrepancy, although ice flow may have introduced some discontinuities into the records. Further work will be necessary to establish how much climatic information it will eventually be possible to extract from the lower parts of the two cores.