Assessing the accuracy of Greenland ice sheet ice ablation measurements by pressure transducer
Assessing the accuracy of Greenland ice sheet ice ablation measurements by pressure transducer
复制标题
通过压力传感器评估格陵兰冰盖冰消融测量的准确性
作者：
R. Fausto;D. van As;A. Ahlstrøm;M. Citterio
摘要我们提出了一种测量冰消融的方法，使用绝对压力传感器作为自动气象站（AWS）系统的一部分，我们已经安装在格陵兰冰盖上的17个位置。压力传感器组件钻入冰中，封闭在充满防冻液的软管中。由传感器记录的压力信号是传感器上方的垂直液体柱的压力信号，该压力信号可以被转换为深度和冰消融速率，从而知道液体的密度。在亚日常的时间尺度上测量，这种组件非常适合监测偏远地区的冰消融，与其他成熟的方法相比具有明显的优势。压力传感器系统具有监测冰消融数年而无需重新钻孔的潜力，并且该系统适用于高消融区域（> 5 ma-1）。介绍了将原始测量值转换为消融值的例程，包括从信号中去除气压变化的基于物理的方法。压力传感器的时间序列进行比较，记录的声波测距仪的气候恶劣的设置在格陵兰冰盖。
Abstract We present a method of measuring ice ablation using an absolute pressure transducer as part of an automatic weather station (AWS) system, which we have installed in 17 locations on the Greenland ice sheet. The pressure transducer assembly is drilled into the ice, enclosed in a hose filled with antifreeze liquid. The pressure signal registered by the transducer is that of the vertical column of liquid over the sensor, which can be translated to depth, and ice ablation rate, knowing the density of the liquid. Measuring at sub-daily timescales, this assembly is well suited to monitoring ice ablation in remote regions, with clear advantages over other, well-established methods. The pressure transducer system has the potential to monitor ice ablation for several years without re-drilling, and the system is suitable for high-ablation areas (>5ma-1). A routine to transform raw measurements into ablation values is presented, including a physically based method to remove air-pressure variability from the signal. The pressure transducer time series is compared to that recorded by a sonic ranger for the climatically hostile setting on the Greenland ice sheet.