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Greenland ice sheet mass balance assessment (1995-2019)
No full textInput-output assessment of annual ice-sheet mass balance in eighteen ice-sheet sectors during 1995-2019. Ice-sheet output, or ice discharge across the grounding line, is estimated by adding downstream corrections to the ice flux across the PROMICE perimeter. Ice-sheet input, or area-integrated surface mass balance, is estimated from a regional climate model. Ice-sheet mass balance is assessed as input minus output
Replication Data for: Running MPS simulations of geology and redox in LOOP3 catchment area, Denmark
No full textThis dataset contains .gslib files (http://www.gslib.com/gslib_help/format.html, access 18-05-2021) of training images, soft data and hard data.
The files following files correspond to geological element 1:
softdataRed1.gslib: Soft data redox
softdataGeo1.gslib: Soft data geology
hdgeo1.gslib: Hard data
ti1.gslib: Training image
The files following files correspond to geological element 2:
softdataRed2.gslib: Soft data redox
softdataGeo2.gslib: Soft data geology
hdgeo2.gslib: Hard data
ti2.gslib: Training image
This dataset also include the parameter files for running the simulations for both geological elements in DeeSse software (https://www.ephesia-consult.com/portfolio/deesse/, last access 18/5-2021
Greenland Geothermal Heat Flow Database and Map
No full textDatabase of all geothermal heat flow measurements within 500 km of Greenland's coastline with self-consistent machine-learning geothermal heat flow map over all onshore and offshore areas. Updated as new measurements become available
Greenland ice sheet mass balance from 1840 through next week
No full textMass balance (and components) for Greenland.
Paper: https://doi.org/10.5194/essd-13-5001-2021
Code: https://github.com/GEUS-Glaciology-and-Climate/mass_balance/
Issues: https://github.com/GEUS-Glaciology-and-Climate/mass_balance/issues/
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Camp Century: Firn density measurements in cores B73 and B62
No full textFirn density measurements at Camp Century
Contact: William Colgan ([email protected])
Please cite the following study if using the data:
Colgan, W., Pedersen, A., Binder, D., Machguth, H., Abermann, J., & Jayred, M. (2018). Initial field activities of the Camp Century Climate Monitoring Programme in Greenland. GEUS Bulletin, 41, 75-78. https://doi.org/10.34194/geusb.v41.4347
Description:
The two density profiles are composed of snow pit measurements in the top ~1 m and measurements on a core drilled with the Eclipse2 ice-drilling system from the University of Wisconsin for the rest of the profile.
system
Core B73 was drilled on 25-jul-2017 at 77.1826 °N, 61.1125°W, 1886 m a.s.l. to a depth of 73 m. It is located within the footprint of the military station.
Core B62 was drilled on 28-jul-2017 at 77.1714°N, 61.0778°W, 1887 to a depth of 62 m. It is located outside the footprint of the military station
Danmarks Digitale Jordartskort 1:25 000 version 6.0 - ArcGIS og QGIS
No full textDet digitale jordartskort viser overfladegeologien i digital form. I denne version 6.0 fra 2021 er 91% af Danmarks landareal klassificeret, og kortet kompletteres løbende.
Kortet er et resultat af den systematiske geologiske kortlægning af Danmark. Informationerne er indsamlet ved feltarbejde, hvor jordprøver udtages ved hjælp af et hånsspyd i 1 meters dybde, det vil sige lige under pløjelag og jordbundsudviklingen. Afstanden mellem jordprøverne er 100-200 meter. Jordarterne er inddelt i 82 typer. Kort- og jordartsbeskrivelsen er udgivet i GEUS rapport 2021/68, hvor yderligere oplysninger kan findes.
Datapakken indeholder filer til brug i GIS systemerne ArcGIS v. 10.7.1 og QGIS v. 3.24.3
Greenland Ice Velocity from Sentinel-1 Edition 2
No full text The PROMICE Ice Velocity product is a timeseries of Greenland Ice Sheet velocity mosaics based on ESA Sentinel-1 SAR offset tracking.
The product span the period September 2016 to present.
Spatial resolution: 500 m
Temporal resolution: A new mosaic spanning 2 Sentinel-1A cycles i.e. 24 days is posted every 12 days.
Each mosaic: All possible 6 and 12 day pairs using Sentinel-1A and 1B is included in the mosaic.
Each mosaic is supplied as a NetCDF file.
Projection: Polar Stereographic projection (EPSG: 3413)
We aim to make each new mosaic available within 10 days of the last included acquisition.
To see and post comments/recommendations please check out: github.com/GEUS-PROMICE/Sentinel-1_Greenland_Ice_Velocity
Main updates:
All 6 day and 12 day pairs possible are included in each 2 cycle mosaic.
We no longer mask out results in ice free areas in order to avoid removing ice flow as the ice sheet advances
We apply the culling scheme described in Solgaard, A., Kusk, A., Merryman Boncori, J. P., Dall, J., Mankoff, K. D., Ahlstrøm, A. P., Andersen, S. B., Citterio, M., Karlsson, N. B., Kjeldsen, K. K., Korsgaard, N. J., Larsen, S. H., and Fausto, R. S.: Greenland ice velocity maps from the PROMICE project, Earth Syst. Sci. Data, 13, 3491–3512, https://doi.org/10.5194/essd-13-3491-2021, 2021.
NOTE: From version 11:
Prior to version 11, the mosaics covering dates in 2021 were not culled correctly. In version 11 the affected mosaics have been re-culled and uploaded.
NOTE: From version 31:
Prior to version 31, there were gaps in the timeseries in 2017. These have now been filled.
NOTE: No 6 day pairs in mosaics since Dec 23 2021:
Due to a faliure on Sentinel-1 B, no data has been received from the satellite since Dec 23 2021. For this reason the mosaics produced since then includes no 6 day pairs. This limits the quality of the posted ice velocity mosaics.
How to cite:
When using the dataset please use: Anne Solgaard; Anders Kusk, 2021, "Greenland Ice Velocity from Sentinel-1 Edition 2", https://doi.org/10.22008/promice/data/sentinel1icevelocity/greenlandicesheet, GEUS Dataverse
Literature citation: Solgaard, A., Kusk, A., Merryman Boncori, J. P., Dall, J., Mankoff, K. D., Ahlstrøm, A. P., Andersen, S. B., Citterio, M., Karlsson, N. B., Kjeldsen, K. K., Korsgaard, N. J., Larsen, S. H., and Fausto, R. S.: Greenland ice velocity maps from the PROMICE project, Earth Syst. Sci. Data, 13, 3491–3512, https://doi.org/10.5194/essd-13-3491-2021, 2021.
Please add the following to your acknowledgements: "Ice velocity maps were produced as part of the Programme for Monitoring of the Greenland Ice Sheet (PROMICE) using Copernicus Sentinel-1 SAR images distributed by ESA, and were provided by the Geological Survey of Denmark and Greenland (GEUS) at http://www.promice.dk."
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Gapless semi-empirical daily snow and ice albedo from Sentinel-3 OLCI
No full textSnow and ice broadband albedo from Sentinel-3 OLCI measurements after Kokhanovsky et al 2020 (snow areas) and empirical regression (ice areas) (doi:10.22008/FK2/SNX8L6) where two post-processing steps have been applied:
- downward outlier detection and removal based on a relation as a function of elevation
- cumulative data filling (gapless product
Greenland Ice Sheet outlet glacier terminus positions 1978-1987 from aero-photogrammetric map data
No full textThe data set consists of 461 end of melt season outlet glacier terminus positions 1978-1987 from 452 marine terminating glaciers of the Greenland Ice Sheet.
Documentation is found in README.pd
Camp Century: Firn compaction measurements (CEN-COM)
No full textFirn compaction measurements at Camp Century (CEN-COM)
Contact:
Baptiste Vandecrux ([email protected])
Please cite the following study when using these data:
Vandecrux, B., Colgan, W., Solgaard, A.M., Steffensen, J.P., and Karlsson, N.B.(2021). Firn evolution at Camp Century, Greenland: 1966-2100, Frontiers in Earth Science, https://doi.org/10.3389/feart.2021.578978, 2021
Location:
77.18N -61.11E 1886 m a.s.l
Temporal coverage: 2017-08-01 to 2020-01-19
Temporal resolution: daily snapshots
Instrument design:
The instrument were designed by Mike MacFerrin ([email protected]) after “coffee-can” method (Hulbe and Whillans, 1994; Hamilton et al., 1998) to continuously monitor firn compaction, similar to the method used by Arthern et al. (2010). Each instrument is composed of a line with a weight attached to one end and connected to a spring-loaded potentiometer on the other end. The weight is anchored at the bottom of a borehole, and the potentiometer is placed at the top of the borehole. As the borehole shortens due to firn compaction, the potentiometer reels in the string to maintain tension, and a data logger records the length of string that has been reeled in.
The CEN-COM station was first introduced by Colgan et al. (2018) and then described and used in Vandecrux et al. (2021). Please consider citing these two studies if using this data.
References:
Arthern, R.J., Vaughan, D.G., Rankin, A.M., Mulvaney, R., and Thomas, E.R. (2010). In situ measurements of Antarctic snow compaction compared with predictions of models. J. Geophys. Res. 115, 12 PP.
Colgan, W., Pedersen, A., Binder, D., Machguth, H., Abermann, J., and Jayred, M. (2018). Initial field activities of the camp century climate monitoring programme in Greenland. Geol. Surv. of Denmark Greenland Bull. 41, 75–78. doi:10.34194/geusb.v41.4347
Hamilton, G.S., and Whillans, I.M. (2002). Local rates of ice-sheet thickness change in Greenland. Ann. Glaciol. 35, 79–83.
Hulbe, C., & Whillans, I. (1994). A method for determining ice-thickness change at remote locations using GPS. Annals of Glaciology, 20, 263-268. doi:10.3189/1994AoG20-1-263-268
Vandecrux, B., Colgan, W., Solgaard, A.M., Steffensen, J.P., and Karlsson, N.B.(2021). Firn evolution at Camp Century, Greenland: 1966-2100, Frontiers in Earth Science, https://doi.org/10.3389/feart.2021.578978, 2021
Instrumental set up:
On 1st of August 2017, three instruments were installed:
Instrument #1: Top at 1.4 m depth, end of line at 62.3 m depth
Instrument #2: Top at 0.0 m depth, end of line at 20.0 m depth
Instrument #3: Top at 0.0m depth, end of line at 5.0 m depth
On the 16th of May 2019, these three intruments were unplugged and two new instruments were inserted:
Instrument #1: Top at 0.0 m depth, end of line at 4.9 m depth (+/- 0.2 m)
Instrument #2: Top at 0.0 m depth, end of line at 7.7 m depth (+/- 0.2 m)
Instrument #5 failed and did not record any data.
Field operators: Liam Colgan, Robert S. Fausto, Allan Ø. Pedersen
Data description:
This folder contains transmissions from the station modem.
The three useful columns are the last three: "INST_1_LENGTH_CORRECTED_M" (and INST_2, INST_3, respectively). This shows the length of the 2-m potentiometer cable over time.
To derive borehole length from these measurements, do this:
INIT_BOREHOLE_LEN = depth (m) of the borehole when it was first drilled at the instrument installed.
INIT_CABLE_LEN = length of the cable (m) at the first full day after the instrument was installed (can check your field notes, or just plot & look at the data to see when the trends begin), from the table
CURRENT_CABLE_LEN = length of the cable (m) on any subsequent day
CURRENT_BOREHOLE_LEN = length of the borehole (m) on any subsequent day
Calculate as such:
CURRENT_BOREHOLE_LEN = INIT_BOREHOLE_LEN - INIT_CABLE_LEN + CURRENT_CABLE_LEN
The first weeks of measurements can be affected by the initial settling of the instrument into the snow.<br