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Abstract:
All available snow depth measurements with Magnaprobe.
Information about transect_name, measurement_type, ice_floe are added while original positions and counter are dropped in the json files. Matlab time is converted to ISO8601 format and the unit of snow thickness is converted to meters. The transect name is indicated in the original files. The original files are stored under directories which indicate the ice floe and the measurement type.
Quality
Snow depth surveys were made with a GPS snow probe, referred to as Magnaprobe (Snow-Hydro, Fairbanks, AK, USA). The Magnaprobe is a thin pole with a sliding disk of 0.2 m in diameter around it. The pole penetrates the snow pack to the sea-ice surface while the disk rests on the snow surface. Inside the pole a magnetic device measures the distance between the disk and the lower tip of the pole providing the snow depth (Sturm, 1999). Each depth is time- and position-tagged and recorded on a data logger. The Magnaprobe enables snow depth surveys with several thousand snow depth measurements in a few hours. The accuracy of the measurement is +-3 mm (Marshall et al., 2006) and the footprint is the size of the disk. Measurements were made every 3-4 strides, approximating a 1.5 m interval. Calibration/errorours measurements were removed manually. Data is provided as CSV files.
Filename contains date in format YYYY_MM_DD, MP, thereafter sometimes unique line number, thereafter either i (independant), t (transect), tF (transect on FYI only), or tM (transect on MYI only)
File contains no headerline and 7 columns, seperator is space:
[date/time (matlab)] [counter] [snow thickness in cm] [original latitude] [original longitude] [driftcorrected latitude] [driftcorrected longitude]
735979.5663 110001 37.6400 83.2225 21.2081 83.2225 21.2092