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Distributed temperature sensing data from a borehole drilled to the base of Sermeq Kujalleq (Store Glacier), Greenland, in July 2019


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Type

Dataset

Change log

Authors

Christoffersen, Poul  ORCID logo  https://orcid.org/0000-0003-2643-8724
Hubbard, Bryn 
Doyle, Samuel 

Description

ABSTRACT: This is distributed temperature sensing (DTS) data from a 1,043 m borehole drilled to the base of Sermeq Kujalleq (Store Glacier), Greenland, 28 km inland from the glacier terminus. The DTS system was installed on 5 July 2019, with recordings continuing until cable failure on 13 August 2019. The record resolution is ~0.65 m. Full details are available in the README.txt file

Version

Software / Usage instructions

DATA STRUCTURE AND DATA FORMAT: The data is stored in a few different ways: raw data is provided as (DTS) machine outputted .xmls found in the directories: /channel_1 (5.4 GB) raw data spanning the entire measurement period from channel one of the DTS machine, subdivided into .xmls with equal number of samples* and averaging period. /channel_3 (4.6 GB) raw data spanning the entire measurement period from channel one of the DTS machine, subdivided into .xmls with equal number of samples* and averaging period. /channel_1_civil_eng (43 MB) raw data from experiments at Cambridge Univeristy Civil Engineering Building to determine integrated differential attenuation-strain relationship. /channel_1_SPRI_basement (944 KB) measurements used in laboratory calibration of the cable zeta parameter. /processed_data (4.7 GB) the processed raw data for figure plotting with Python consisting of: DataSet_ST_data_ch1.nc (2.5 GB) and DataSet_ST_data_ch3.nc (2.4 GB)(NetCDF) uncalibrated (anti-)Stokes data from the DTS used in calculating integrated differential attenuation for DTS channels 1 and 3 respectively. ch1_full_processed.nc (42 MB)(NetCDF) fully processed temperature data for full measurement period for channel 1 for figure plotting use. ch1_end_processed.nc (0.3 MB) (NetCDF) fully processed temperature data for final 96 hours of measurement period for channel 1. /Doyle_data/analog_blue.csv (csv) csv data for thermistors from Samuel Doyle. The processed data can be viewed using the Python files in the root directory. The packages used in the creation of these scripts are found within Python_env_packages.txt . dtscalibration is dependent on specific versions of some packages, so if you are having trouble getting things going I recommend checking your package versions. If you are just wish to visualise the data, then use 3_plotting.py which will produce the figures used in the publication unless ch1_full_processed.nc or ch1_end_processed.nc have been overwritten. If you're doing this there is no need to download the raw DTS data contained in /channel_1 and /channel_3 Running 1_full_process.py and 2_end_profile will overwrite ch1_full_processed.nc and ch1_end_processed.nc respectively. As supplied, if you do generate new files they should be identical to the ones already present. These files are probably most helpful if you wanted to process a new DTS dataset and needed an example, though better guidance on the dtscalibration package is avaiable at: https://github.com/dtscalibration/python-dts-calibration/tree/master/examples . A full processing run through takes about 30 mins on a 2018 i7 processor. *sample number varies from 11078 to 11079, probably a result of a minor change in fibre refractive index with temperature. The dtscalibration package is not yet adapted to account for these variations automatically.

Keywords

Greenland, Distributed temperature sensing, DTS, Store Glacier, Glacier borehole, Ice temperature, Marine-terminating glacier

Publisher

Sponsorship
European Commission Horizon 2020 (H2020) ERC (3276207)
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