Cosmogenic nuclide data from glacial deposits along the Liv Glacier coast

Abstract: This data set contains measurements of cosmic-ray-produced Be-10 in quartz from glacial erratics and bedrock at sites along and adjacent to Liv Glacier and Amundsen Glacier in the southern Transantarctic Mountains. Samples were collected during the 2016-17 and 2017-18 field seasons working from remote camps along the coast. Locations were determined by hand-held GPS. Elevations are based on barometric altimetry corrected for daily drift and referenced to precise (geodetic) GPS benchmarks established over a range of altitudes at each site. Horizon geometry and the resulting topographic shielding of the cosmic ray flux was determined from vertically-oriented full-sky (fisheye) photographs at each sample location. Samples were processed at the University of Washington Cosmogenic Nuclide Laboratory using established procedures for mineral separation, dissolution, beryllium extraction and purification, described at http://depts.washington.edu/cosmolab/chem.shtml. Beryllium isotope ratios were measured at the Lawrence Livermore Center for Accelerator Mass Spectrometry (LLNL-CAMS) relative to the KNSTD-Be-01-5-4 standard, assuming a standard Be-10/Be-9 ratio of 2.851E-12 (07KNSTD normalization). Data are reported as input for the online CRONUS cosmogenic nuclide calculator (V3, current at the time of submission in November 2019). Exposure ages can be obtained by entering the data into the CRONUS calculator, at: http://hess.ess.washington.edu/math/v3/v3_age_in.html .
Data for each sample consists of two lines of input parameters, as follows:
{Sample_name, Latitude (DD), Longitude (DD), Altitude (m asl), Scaling_function, Thickness (cm), Density (g/cm^3), Horizon_correction, Erosion_rate (cm/yr), Year_sampled}
{Sample_name, Nuclide (in this case Be-10), Target_mineral (quartz), Be-10_concentration (atom/g), Error_Be-10_concentration (atom/g), Normalization}
Further information about the V3 input format is given at:
http://hess.ess.washington.edu/math/docs/v3/v3_input_explained.html

摘要：本数据集包含南极横断山脉（Transantarctic Mountains）南部利夫冰川（Liv Glacier）与阿蒙森冰川（Amundsen Glacier）沿线及邻近区域的冰川漂砾和基岩石英（quartz）中宇宙射线成因的铍-10（Be-10）测量数据。
样本采集于2016—2017及2017—2018年度野外作业季，依托沿海远程营地开展工作，采样点位通过手持GPS（hand-held GPS）确定。采样点高程基于气压测高法测定，并针对每日漂移进行校正，同时以各点位范围内设立的高精度大地测量GPS基准点（geodetic GPS benchmarks）作为参考基准。利用每个采样点处垂直拍摄的全天空（鱼眼）照片，确定了视场几何形态及其引发的宇宙射线通量地形屏蔽效应。
所有样品均在华盛顿大学宇宙成因核素实验室（University of Washington Cosmogenic Nuclide Laboratory）按照既定流程进行矿物分离、样品溶解、铍元素提取与纯化，具体流程可参见http://depts.washington.edu/cosmolab/chem.shtml。
铍同位素比值的测定以KNSTD-Be-01-5-4标准物质为参照，采用标准Be-10/Be-9比值为2.851×10^-12（07KNSTD归一化方案），测定工作在劳伦斯利弗莫尔加速器质谱中心（Lawrence Livermore Center for Accelerator Mass Spectrometry, LLNL-CAMS）完成。本数据集的数据可作为在线CRONUS宇宙成因核素计算器（版本3，于2019年11月投稿时为最新正式版本）的输入参数。将数据导入该计算器即可获取样品暴露年龄，计算器网址为http://hess.ess.washington.edu/math/v3/v3_age_in.html。

每个样本的输入参数包含两行，具体格式如下：
{样本名称, 纬度（十进制度）, 经度（十进制度）, 海拔（米，海平面以上）, 标度函数, 厚度（厘米）, 密度（克/立方厘米）, 视场校正值, 侵蚀速率（厘米/年）, 采样年份}
{样本名称, 核素（本次为Be-10）, 目标矿物（石英）, Be-10浓度（原子/克）, Be-10浓度误差（原子/克）, 归一化方案}
关于V3版本输入格式的更多说明可参见：http://hess.ess.washington.edu/math/docs/v3/v3_input_explained.html