Data for "Observing the near-surface properties of the Greenland Ice sheet"

File containing the underlying data presented the manuscript "Observing the near-surface properties of the Greenland ice sheet" by K.M. Scanlan, A. Rutishauser, and S.B. Simonsen. DOI:10.1029/2022GL101702. <br> Data in the single netCDF data file are organized into three parallel groups; one for each base satellite altimetry dataset (i.e., SARAL, CryoSat-2 LRM, and CryoSat-2 SARIn). Goups for indiviudal years (2013-2018) are included within each base sateliitle data group. The actual data are then organized in monthly groups within each year. Note that CryoSat-2 LRM and CryoSat-2 SARIn data span the entire time range (January 2013 - December 2018) while SARAL data files only cover May 2013 through December 2018 as the SARAL satellite was lauched in February 2018. <br> Data have been subject the quality control procedures described in the manuscript. Data at any grid node not meeting the qualiy control standards has been assigned NaN. Each netCDF file contains the following variables; <br> X: Grid node EPSG:3413 X coordinate [meters] Y: Grid node EPSG:3413 Y coordinate [meters] Pc: Uncalibrated RSR coherent power [dB] Pn: Uncalibrated RSR incoherent power [dB] Pt: Uncalibrated RSR total power [dB] crl: RSR statistical fit correlation coefficient [-] R: RSR search radius [meters] sig_h: Calibrated surface RMS height [meters] eps: Calibrated surface relative dielectric permittivity [-] rho: Calibrated surface density [gram per cubic centimeter]

本文件包含K.M. Scanlan、A. Rutishauser与S.B. Simonsen发表于论文《观测格陵兰冰盖近地表特性》（*Observing the near-surface properties of the Greenland ice sheet*）的原始数据，DOI：10.1029/2022GL101702。
该单个netCDF（网络通用数据格式，Network Common Data Form）数据文件内的数据被整理为三个平行数据集组，分别对应三款基础卫星测高数据集：SARAL、CryoSat-2 LRM以及CryoSat-2 SARIn。每个基础卫星数据集组下包含2013年至2018年各年度的子分组，各年度子分组内的数据再按月度划分为月度分组。需注意，CryoSat-2 LRM与CryoSat-2 SARIn数据集的时间覆盖范围为2013年1月至2018年12月；而SARAL数据集仅覆盖2013年5月至2018年12月，原因是SARAL卫星于2018年2月发射升空。
本数据集已按照论文中所述的质量控制流程完成处理。所有未通过质量控制标准的网格节点数据均被赋值为NaN（非数值，Not a Number）。每个netCDF文件包含以下变量：
X：网格节点EPSG:3413坐标系X坐标，单位：米；
Y：网格节点EPSG:3413坐标系Y坐标，单位：米；
Pc：未校准的RSR（雷达散射比，Radar Scattering Ratio）相干功率，单位：分贝（dB）；
Pn：未校准的RSR非相干功率，单位：分贝（dB）；
Pt：未校准的RSR总功率，单位：分贝（dB）；
crl：RSR统计拟合相关系数，无量纲；
R：RSR搜索半径，单位：米；
sig_h：校准后的地表均方根高度，单位：米；
eps：校准后的地表相对介电常数，无量纲；
rho：校准后的地表密度，单位：克每立方厘米。