Water Stage and Discharge of a Supraglacial Stream in Southwest Greenland (67.15N, 50.00W) Each Minute from July 13, 2019 to August 10, 2019

A small supraglacial stream in Southwest Greenland was observed for a 29-day period during the melt season of 2019. A Solinst Levellogger pressure transducer continuously measured stage height every minute throughout the observation period. The logger was placed in a RACO-2 metal project box filled with rocks with conduit holes knocked out to allow water to easily flow through. The box was anchored to a PVC pole drilled into the thalweg of the stream channel. Stage heights were corrected for atmospheric presssure using a Solinst Barologger located 2 m above the ice surface of the adjacent shore. Water heights were also collected with a meter stick at the location of the logger periodically throughout the field season in order to correct for measurement drift and systematic instrumentation error. The measurements showed that water level varied between 0.02 and 0.36 meter (m) fluctuating diurnally. Daily averaged water level peaked on August 1st. Additionally to the water stage heights, stream discharge was recorded with a Sontek FlowTracker2 Handheld Acoustic Doppler Velocimeter on 33 occasions throughout the observation period. Measurements were used to create a rating curve relating stage to discharge in an exponential relationship. The relationship was used to extrapolate stream discharge every minute for the 29-day period. This dataset contains the following files: 1. 660_Stage_Data_Downstream_Manual_Corrected; Time series of barometric pressure, water pressure, water level, and interpolated discharge for the study period. 2. Velocity_Data_2019_published; Summary data of velocity and stream geometry measurements collected with the Acoustic Doppler Velocimeter 3. Depth_Velocity_SiteX_Profile_MMDDYYYY; Detailed stream velocity and geometry measurements for each of the 57 site where X is the site number This data is further described in Leidman et al., 2023.

2019年融冰季期间，科研人员对格陵兰西南部的一条小型冰面溪流（supraglacial stream）开展了为期29天的连续观测。
索林斯特Levellogger型压力传感器（Solinst Levellogger pressure transducer）在整个观测周期内以每分钟1次的频率持续监测水位高度。该传感器被安置于一个RACO-2型金属工程箱内，箱内填充石块且预先开凿导管孔以保障水流顺畅通过；该箱体被固定于一根打入溪流主泓道（thalweg）的PVC立杆上。
研究人员利用一台安装在邻近岸冰面上方2米处的索林斯特Barologger型气压记录仪（Solinst Barologger）所采集的数据，对监测得到的水位高度进行大气压力校正。此外，在整个野外观测期内，还定期使用米尺在传感器布设位置同步测量水位高度，用于修正测量漂移与仪器系统误差。
实测数据显示，水位在0.02米至0.36米之间波动，且呈现日周期变化特征；日平均水位于8月1日达到峰值。
除水位高度外，研究人员还在整个观测期内的33次测量中，采用Sontek FlowTracker2型手持式声学多普勒流速仪（Sontek FlowTracker2 Handheld Acoustic Doppler Velocimeter）记录溪流流量（stream discharge）。通过上述测量数据构建了水位与流量间的指数型水位流量率定曲线（rating curve），并利用该关系曲线将29天观测期内的流量以每分钟1次的频率进行外延推算。
本数据集包含以下文件：
1. 660_Stage_Data_Downstream_Manual_Corrected：研究时段内的大气压、水压力、水位高度及插补流量时间序列数据集。
2. Velocity_Data_2019_published：采用声学多普勒流速仪采集的流速与溪流几何形态测量汇总数据集。
3. Depth_Velocity_SiteX_Profile_MMDDYYYY：57个测点的详细溪流流速与几何形态测量数据集，其中X为测点编号，MMDDYYYY为日期格式。
本数据集的详细说明可参见Leidman等人2023年发表的研究成果。