glenglat: Global englacial temperature database

Open-access database of englacial temperature measurements compiled from data submissions and published literature. It is developed on GitHub and published to Zenodo.

Data structure

The dataset adheres to the Frictionless Data Tabular Data Package specification. The metadata in datapackage.yaml describes, in detail, the contents of the tabular data files in the data folder:

• source.csv: Description of each data source (either a personal communication or the reference to a published study).
• borehole.csv: Description of each borehole (location, elevation, etc), linked to source.csv via source_id and less formally via source identifiers in notes.
• profile.csv: Description of each profile (date, etc), linked to borehole.csv via borehole_id and to source.csv via source_id and less formally via source identifiers in notes.
• measurement.csv: Description of each measurement (depth and temperature), linked to profile.csv via borehole_id and profile_id.

For boreholes with many profiles (e.g. from automated loggers), pairs of profile.csv and measurement.csv are stored separately in subfolders of data named {source.id}-{glacier}, where glacier is a simplified and kebab-cased version of the glacier name (e.g. flowers2022-little-kluane).

Supporting information

Folder sources contains subfolders (with names matching column source.id) with files that document how and from where the data was extracted. Files with a .png, .jpg, or .pdf extension are figures, tables, maps, or text from the publication. Pairs of files with .pgw and .{png|jpg}.aux.xml extensions georeference a .{png|jpg} image, and files with .geojson extension are the subsequently-extracted spatial coordinates. Files with an .xml extension document how numeric values were extracted from maps and figures using Plot Digitizer. Of these, digitized temperature profiles are named {borehole.id}_{profile.id}{suffix} where borehole.id and profile.id are either a single value or a hyphenated range (e.g. 1-8). Those without the optional suffix use temperature and depth as axis names. Those with a suffix are unusual cases which, for example, may be part of a series (e.g. _lower) or use a non-standard axis (e.g. _date).