Density and ice layer stratigraphy in 24 shallow firn cores from Southwest Greenland, 2017 - 2019

Observations of near-surface firn density and ice layer stratigraphy collected on the Greenland ice sheet are rare. This dataset contains information about twenty-four shallow firn cores drilled in the percolation zone in southwest Greenland between 2017 and 2019. Seven cores ranged between 2.9 and 6.3 meter (m) depth, with the remaining seventeen cores extending to 10–27 m depths. Each core has data on density, ice layer stratigraphy, and type of material (i.e. snow, firn, or ice). Quality control was performed on all data to replace erroneous data. More details including uncertainty analysis are provided in the method section and in Rennermalm et. al., (2021). The dataset includes the following files Core_meta_data.csv : File with metadata about each core, including location, site name, retrieval date, investigators, and other information Explanation_of_core_variables.csv : File with explanation of the variables reported in the core data files Core data files: For each core two files are included: a) a file with all field data with the following file naming convention [Site]-[Year]-[Core number], and b) a file only including the depth/thickness of all ice layers [Site]-[Year]-[Core number]_icelayer_data. Text in brackets are variables. References: Rennermalm, Å. K., Hock, R., Covi, F., Xiao, J., Corti, G., Kingslake, J., Leidman S. L., Miege, C., MacFerrin, M., Machguth, H., Osterberg, E., Kameda, T., McConnell. J. 2021. Shallow firn cores 1989 - 2019 in southwest Greenland’s percolation zone reveal decreasing density and ice layer volume after 2012. Journal of Glaciology, 1-12, https://doi.org/10.1017/jog.2021.102

格陵兰冰盖近地表粒雪层（firn）密度与冰层地层学的观测数据较为匮乏。本数据集收录了2017至2019年间，在格陵兰西南部渗流区钻取的24根浅粒雪岩芯的相关信息。其中7根岩芯的钻进深度介于2.9至6.3米（m），剩余17根岩芯的钻进深度可达10至27米。每根岩芯均包含密度、冰层地层学以及物质类型（即积雪、粒雪层或冰）相关数据。所有数据均已开展质量管控，对错误数据予以修正替换。更多细节（包括不确定性分析）详见方法章节及Rennermalm等（2021）的研究成果。

本数据集包含以下文件：
1. Core_meta_data.csv：记录各岩芯元数据的文件，包含采样位置、站点名称、获取日期、研究人员及其他相关信息
2. Explanation_of_core_variables.csv：对岩芯数据文件中所报告变量的说明文件
3. 岩芯数据文件：针对每根岩芯，均包含两类文件：
a) 包含全部野外实测数据的文件，命名格式为"[Site]-[Year]-[Core number]"；
b) 仅收录所有冰层厚度/深度数据的文件，命名格式为"[Site]-[Year]-[Core number]_icelayer_data"。方括号内为变量占位符。

参考文献：
Rennermalm, Å. K., Hock, R., Covi, F., Xiao, J., Corti, G., Kingslake, J., Leidman S. L., Miege, C., MacFerrin, M., Machguth, H., Osterberg, E., Kameda, T., McConnell. J. 2021. 格陵兰西南部渗流区1989-2019年浅粒雪岩芯：2012年后密度与冰层体积呈下降趋势. 《冰川学杂志》, 1-12, https://doi.org/10.1017/jog.2021.102