Alpine ice cores and ground penetrating radar: combined investigations for glaciological and climatic interpretations of a cold Alpine ice body
Alpine ice cores and ground penetrating radar: combined investigations for glaciological and climatic interpretations of a cold Alpine ice body
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高山冰芯和探地雷达：对寒冷的高山冰体进行冰川学和气候解释的综合研究
DOI：
10.3402/tellusb.v55i5.16394
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发表时间：
2003
期刊：
影响因子：
--
通讯作者：
D. Wagenbach
中科院分区：
文献类型：
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作者：
O. Eisen;U. Nixdorf;L. Keck;D. Wagenbach
准确地将冰芯解释为气候档案需要详细了解其过去和现在的地球物理环境。不同的技术有助于确定和重建钻探地点周围的冰川环境。在ALPCLIM1项目期间，从瑞士-意大利阿尔卑斯山的科勒·格尼菲蒂提取了两个包含长期气候信息的冰芯。在这里，我们结合冰芯数据，研究探地雷达(GPR)探测的可能性，以获得关于寒冷的阿尔卑斯山冰体内部结构的信息，以改进气候解释。三个钻探点通过探地雷达剖面连接，平行和垂直于流线，从而产生地下的三维图像，并能够跟踪位置之间的内部反射层。由于观测到的反射是等时起源的，它们允许转移冰芯之间的年龄-深度关系。通过将转移的时间尺度与原始岩心日期、来自较旧冰芯的独立信息以及基于冰川表面数据的流动模拟结果进行比较，来估计探地雷达结果的准确性。我们的研究表明，探地雷达是阿尔卑斯山冰芯研究的必备工具，因为它可以绘制物理-化学性质的主要转变图，传递地点之间的年龄深度关系，将岩芯记录中的信号相互关联以进行解释，并建立气候档案周围流动状况的详细图景。高海拔阿尔卑斯山冰川的环境和气候记录。
Accurate interpretation of ice cores as climate archives requires detailed knowledge of their past and present geophysical environment. Different techniques facilitate the determination and reconstruction of glaciological settings surrounding the drilling location. During the ALPCLIM1 project, two ice cores containing long-term climate information were retrieved from Colle Gnifetti, Swiss-Italian Alps. Here, we investigate the potential of ground penetrating radar (GPR) surveys, in conjuction with ice core data, to obtain information about the internal structure of the cold Alpine ice body to improve climatic interpretations. Three drill sites are connected by GPR profiles, running parallel and perpendicular to the flow line, thus yielding a three-dimensional picture of the subsurface and enabling the tracking of internal reflection horizons between the locations. As the observed reflections are of isochronic origin, they permit the transfer of age—depth relations between the ice cores. The accuracy of the GPR results is estimated by comparison of transferred timescales with original core datings, independent information from an older ice core, and, based on glaciological surface data, findings from flow modeling. Our study demonstrates that GPR is a mandatory tool for Alpine ice core studies, as it permits mapping of major transitions in physical-chemical properties, transfer of age—depth relations between sites, correlate signals in core records for interpretation, and establish a detailed picture of the flow regime surrounding the climate archive. Environmental and Climate Records from High Elevation Alpine Glaciers.