GPR derived snow depth over A. P. Olsen Ice Cap (2008-2024)

This dataset contains ground-penetrating radar (GPR)-derived end-of-winter snow depths over A.P. Olsen Ice Cap for the period 2008–2024. GPR data were collected using a MALÅ Geoscience ProEx unit with 500 MHz (2008–2011) or 800 MHz (2012–2024) shielded antennas. Data were processed using the ReflexW-2D software package. Raw GPR data can be found in GPR_raw_2008_2024.zip. Processed GPR data, including ReflexW files, are available in GPR_processed_2008_2024.zip. The yyyy_GPR_snowdepth.txt files contain the picked reflection of the last summer surface (using ReflexW), converted to snow depths for each survey year. The variables are: ProfName: Profile Name TraceNr: GPR trace number as recorded along the profile lon: Longitude, degrees East (GPS coordinates recorded with handheld unit, interpolated) lat: Latitude, degrees North (GPS coordinates recorded with handheld unit, interpolated) Elev: Elevation, meters above sea level (GPS coordinates recorded with handheld unit, interpolated) X: Easting, kilometers, EPSG:3413 Y: Northing, kilometers, EPSG:3413 dist: Profile distance, meters twt: Two-way travel time to the picked reflector, nanoseconds depth: Snow depth, meters v_snow: Radar velocity used for time-to-depth conversion, m/ns rho_snow: Snow density used to calculate radar velocity, kg/m3 Amp: Amplitude of the picked reflector The yyyy_GPR_snowdepth_ds.txt files contain snow depth data downsampled to a 2 m interval for each survey year. 2008_2024_GPR_snowdepth_ds.txt contains all downsampled data from the years 2008–2024.本数据集包含2008至2024年间A.P.奥尔森冰盖（A.P. Olsen Ice Cap）区域的冬末探地雷达（ground-penetrating radar, GPR）反演雪深数据。探地雷达数据采用MALÅ Geoscience公司的ProEx采集设备，搭配500 MHz（2008–2011年）或800 MHz（2012–2024年）屏蔽天线采集得到。数据通过ReflexW-2D软件包完成处理。原始探地雷达数据可于GPR_raw_2008_2024.zip文件中获取；含ReflexW格式文件在内的经处理探地雷达数据可于GPR_processed_2008_2024.zip文件中获取。 yyyy_GPR_snowdepth.txt文件存储了各勘测年度通过ReflexW软件拾取的末次夏季地表反射波数据，并转换为对应雪深值。各变量说明如下： - ProfName：剖面名称 - TraceNr：沿剖面记录的探地雷达道号 - lon：经度，东经度数（手持GPS设备记录并经插值处理的GPS坐标） - lat：纬度，北纬度数（手持GPS设备记录并经插值处理的GPS坐标） - Elev：海拔高度，单位为米（相对于海平面，手持GPS设备记录并经插值处理的GPS坐标） - X：东向坐标，单位为千米，采用EPSG:3413坐标系 - Y：北向坐标，单位为千米，采用EPSG:3413坐标系 - dist：剖面距离，单位为米 - twt：拾取反射波的双程走时，单位为纳秒 - depth：雪深，单位为米 - v_snow：用于时深转换的雪层雷达波速，单位为米/纳秒 - rho_snow：用于计算雷达波速的雪层密度，单位为千克/立方米 - Amp：拾取反射波的振幅 yyyy_GPR_snowdepth_ds.txt文件存储了各勘测年度下采样至2米间隔的雪深数据；2008_2024_GPR_snowdepth_ds.txt则包含了2008至2024年全部经下采样处理的数据。