Density of the EastGRIP S6 shallow core

We here report measured densities from a combination of records from the EastGRIP ice-core site. The data come from a trench and two ice cores: the shallow EGRIP-S6 core and the deep main core of the project. Based on these data, we parametrize the density as a function of depth, allowing us to provide a standard transfer function between true depth and ice-equivalent depth which is consistent with the EGRIP density measurements. EGRIP density data are only available to 117 m depth, at which depth the density is about 900 kg/m^3 and the difference between true depth and ice-equivalent depth is about 22 m. The density and overburden profiles have been extended below this depth and all the way to 1200 m in order to provide a convenient, continuous and (mostly) smooth transfer function between true depth and ice-equivalent depth. See PDF file provided under 'Documentation' for full description of data and parametrization.

本研究整合了东格陵兰冰芯项目（EastGRIP）钻孔点的多组观测记录，报道了实测密度数据集。本次数据取自一条冰堑与两根冰芯：浅孔EGRIP-S6冰芯，以及本项目的深部主冰芯。基于上述数据，我们将密度构建为深度的函数，由此得到一套标准的真实深度（true depth）与冰当量深度（ice-equivalent depth）间的转换函数，该函数与EGRIP密度实测结果保持一致。EGRIP密度数据的有效覆盖深度仅至117米，该深度处的密度约为900 kg/m³，真实深度与冰当量深度的差值约为22米。为获取一套便捷、连续且（整体）平滑的真实深度与冰当量深度转换函数，我们将密度与覆压剖面（overburden profiles）从该深度处向下延伸至1200米。有关数据与参数化方法的完整说明，请参阅“文档（Documentation）”板块下提供的PDF文件。