Supplementary material to "Molecular level characterization of supraglacial dissolved organic matter sources and exported pools on the southern Greenland Ice Sheet"

Hydraulic conductivity and water table height were calculated from recharge curves in five auger holes with an initial radius of 70 mm and depth of 400 -450 mm.Throughout the duration of the experiment, surface lowering caused an effective reduction in auger hole depth.Recharge rate was recorded using ultrasonic rangefinders at a 1Hz resolution, and recharge curves were processed as described in Stevens et al. (2018).The height of the water table was defined following the completion of recharge, i.e. when water in the auger hole stopped rising.Full recharge holes were emptied using a siphon prior to the 25 subsequent recharge measurement.Orthoimages and DEMs of the site were created using aerial imagery from a UAV (DJI Mini 2) at 9:00, 14:00, and 21:00 on the sampling day.Flight elevation was 20 m, whilst the camera was set with a fixed aperture (f2.8) and ISO (100), with shutter speed and UAV airpseed adjusted to suit the prevailing light conditions.One orthophoto and DEM were constructed per imageset, at a resolution of 0.024 m/pixel using the commercially available Agisoft MetashapePro (Agisoft, Russia) and GNSS-30 derived position from the UAV (i.e. this was not corrected using ground control points).