Greenland Ice Sheet borehole temperature profiles

Table of contents

• Introduction
• Citation
  • Publication
  • Data
• Data access
• Database format
  • Inputs
  • Outputs
  • Metadata
• How to contribute
• Graphics

Introduction

This is a collection of all Greenland ice borehole temperature profiles we have been able to find. Secondary data, useful to use the temperature profile, is also included when available.

Citation

Publication

@article{loekkegaard_2023,
  author    = {L{\o}kkegaard, Anja and Mankoff, Kenneth D. and Zdanowicz, Christian and Clow,
                  Gary D. and L\"uthi, Martin P. and Doyle, Samuel H. and Thomsen, Henrik H. and
                  Fisher, David and Harper, Joel and Aschwanden, Andy and Vinther, Bo M. and
                  Dahl-Jensen, Dorthe and Zekollari, Harry and Meierbachtol, Toby and McDowell, Ian
                  and Humphrey, Neil and Solgaard, Anne and Karlsson, Nanna. B and Khan, Shfaqat A.
                  and Hills, Benjamin and Law, Robert and Hubbard, Bryn and Christoffersen, Poul and
                  Jacquemart, Myl\`ene and Seguinot, Julien and Fausto, Robert S. and Colgan,
                  William T.},
  title	    = {{G}reenland and {C}anadian {A}rctic ice temperature profiles database},
  journal   = {The Cryosphere},
  year	    = 2023,
  volume    = 17,
  number    = 9,
  pages	    = {3829--3845},
  doi	    = {10.5194/tc-17-3829-2023},
  publisher = {Copernicus {GmbH}}
}

Data

@misc{mankoff_2022,
  author    = {Mankoff, Ken and Løkkegaard, Anja and Colgan, William and Thomsen, Henrik and Clow,
                  Gary and Fisher, David and Zdanowicz, Christian and L\"{u}thi, Martin P. and
                  Vinther, Bo and MacGregor, Joseph A. and McDowell, Ian and Zekollari, Harry and
                  Meierbachtol, Toby and Doyle, Samuel and Law, Robert and Hills, Benjamin and
                  Harper, Joel and Humphrey, Neil and Hubbard, Bryn and Christoffersen, Poul and
                  Jacquemart, Mylène, and Seguinot, Julien},
  title     = {{G}reenland and {C}anadian {A}rctic ice temperature profiles database},
  year 	    = 2022,
  doi 	    = {10.22008/FK2/3BVF9V},
  publisher = {GEUS Dataverse}}

Data access

• See the GEUS Dataverse at https://doi.org/10.22008/FK2/3BVF9V

Database format

Inputs

Profiles are provided by archived data, shared via personal communication, tables in publications, or digitized from graphics in publications. When profiles are available only graphically in publications, we digitize these using the desktop version of WebPlotDigitizer citep:WPD.

Each profile is placed in a folder, where the folder has the same name as the Borehole ID. Within each folder the following exist:

README.org

Overview of data.

meta.bsv

Metadata, in bar (|) separated value format.

data.csv

Temperature profile, in CSV format in d,t order.

Other files may exist. These include:

• PNG and tar files, where the PNG file is a graphic from a publication, and the tar file is the WebPlotDigitizer archive that contains the digitization process.
• TXT, CSV, or other files if the data was provided (online or via email) in a format that needed to be processed into the data.csv format described above
• Python or Bash script files if processing was done to generate the data.csv file. Note - source code is often embedded in each README.org rather than in an external script.

Outputs

The output of this work is in the ./data/ sub-folder:

./data/meta.csv

Metadata for each borehole.

./data/temperature.csv

Temperature profiles on a common scale, all to the depth (first column) of the deepest profile. NaN marks locations without data. -999 marks locations below bedrock (for all but the deepest profile).

./data/temperature_dnorm.csv

The same data as ./data/temperature.csv but the first column is normalized depth, from the ice sheet surface (0) to the bed (1).

Metadata

Metadata for each profile includes:

Borehole ID
Place name
Geographic location
Ice type
Data Source
Data DOI
Science Source
Science DOI
Date
Longitude [°E]
Latitude [°N]
Location Source
Depth of top measurement [m]
Depth of bottom measurement [m]
Ice thickness [m]
Coverage [% of thickness]
Ice thickness source
Velocity [m/yr]
Note

How to contribute

• If you have an ice temperature profile, open an issue and let us know.

Graphics