Experimental data: measurement campaign Hintereisferner Experiment, HEFEX.

The HEFEX micrometeorological measurement campaign was conducted during three weeks in August 2018. Measurement towers were installed on the 1. and 2. August and removed on 22. August. The measurement network consisted of five 3-m tripod towers located at an along- and an across-glacier transect to capture the spatial variations of the atmospheric flow system at the glacier and associated heat exchange processes. The across-glacier transect consisted of three turbulence towers installed from the peripheral zones of the glacier towards the centreline. The location of the across-glacier transect coincides with where the valley of Langtaufererjochferner discharges into the valley of the Hintereisferner glacier. In this area, thermal flows from the surrounding area were hypothesized to influence the surface of Hintereisferner. All stations were installed at comparatively flat areas of the glacier with slope angles varying between 6 and 8°. Measurement towers were installed directly at the ice surface. Due to pronounced changes in the ice surface caused by strong ice melt during the measurement campaign, frequent visual inspection and small adjustments to the location of the towers were essential for good data quality. This mainly consisted of repositioning the tower feet to ensure the tower stability and re-levelling the sensors. Post-processing of data, i.e. correction of data for height changes and rotation of the mast further ensured data qualityHEFEX微气象观测实验于2018年8月开展，周期为三周。观测塔于8月1日、2日架设完成，8月22日完成拆除。本次观测网络共包含5座3米高的三脚架式观测塔，布设为沿冰川样带与跨冰川样带，用于捕捉冰川区域大气流场的空间变化特征及相关热交换过程。其中跨冰川样带布设3座湍流观测塔，从冰川外围区域向冰川中心线方向延伸设置。跨冰川样带的布设位置与Langtaufererjochferner山谷汇入Hintereisferner冰川山谷的区域重合，该区域被学界推测周边热流会对Hintereisferner冰川表面产生影响。所有观测站点均设置于冰川相对平缓的区域，区域坡度介于6°至8°之间，且观测塔直接架设于冰面之上。由于观测期间冰面因强烈消融发生显著变化，为保障数据质量，需频繁开展目视巡检并对观测塔位置进行小幅调整，调整工作主要包括重新固定塔脚以维持塔体稳定，以及对传感器进行重新调平。后期数据处理环节，即针对高度变化进行数据校正并对观测桅杆进行旋转变换，进一步保障了数据质量。