1,721,097 research outputs found
Topographic Correction for Geothermal Heat Flow in Greenland and Antarctica
No full textTopographic correction for geothermal heat flux across both Greenland and Antarctica. This dimensionless correction field is derived from a statistical model applied to BedMachine bed topography. Applying this small-scale topographic correction to independent large-scale geothermal heat flux fields renders them more self-consistent with local bed topography
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
Camp Century: Global Navigation Satellite System measurements
No full textGlobal Navigation Satellite System (GNSS) measurements collected at Camp Century. This includes the CEN-GPS station, which continuously recorded during 2019-2021. This also includes the seven-stake strain network (S1, S2, S3, S4, S5, S6 and S7) that was measured in summer 2017, as well as the spring 2019 re-measurement of stake S5. These data are primary data from the GNSS receivers
Camp Century: Simulations of firn evolution 1966-2100
No full textThis dataset contains the meteorological forcing, calculated surface energy and mass balance and simulated firn evolution at Camp Century during 1966-2100.
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, 202
Camp Century: Firn temperature measurements (CEN-THM)
No full textFirn temperature data at Camp Century (CEN-THM)
Project leader:
William Colgan ([email protected])
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
Initial sensor depth (in meters) for the long string:
0 2 4 6 8 10 12 14 16 18 21 24 27 30 33 36 39 42 45 48 53 58 63 68 73
Initial sensor depth (in meters) for the short string:
0 1 2 3 4 5 6 7 8 9 11 13 15 17 19 22 25 28 31 34 38 42 46 50 54
Format:
comma separated
first column is the time stamp, the others are firn temperature in degree Celsius
Temporal coverage:
2017-07-26 to 2025-12-09<br
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
Hotrod melt-tip ice-drilling system
No full textThis repository contains source files for the Hotrod melt-tip ice-drilling system. This includes: (1) design files for the winch, (2) machining files for the melt tip, (3) design files for the internal melt-tip electronics and instruments, (4) software codes for the interface, and (5) numerical codes for borehole refreezing simulations. The melt tip machining and interface software files reflect a 2022-09-06 time slice of the HotRod repository at https://github.com/geus-clan/HOTROD-source. Where applicable, the 2022-09-06 GitHub filenames are provided. The GitHub working directory many contain more recent files
GPS observations at EGIG and PARCA ice-sheet sites in West Greenland (2020/2022)
No full textThis dataset contains GPS data collected at historical ice-sheet science sites in West Greenland (EGIG: T1, T2, T3, T4, T5, T127, T127a, T128, T129; PARCA: cd08, cd38). This GPS data was acquired during the period 2020-2022, and is provided in both processed and unprocessed form. Field notes, including antenna heights during site visits, are also provided, along with an overview map of the ice-sheet area
Geologic provinces beneath the Greenland Ice Sheet constrained by geophysical data synthesis
No full textThis dataset presents subglacial provinces mapped beneath the Greenland Ice Sheet using seismic tomography, gravity and magnetic anomalies, subglacial topography and the surface expression thereof. This dataverse deposit contains: (1) a "flow-aware" hillshade model of the ice sheet as a raster, (2) the MATLAB script associated with generating the flow-aware hillshade; (3) all traced lineations from the ice-sheet surface as shapefile polylines (4) the seismic tomography results considered in this study that were not previously available as rasters; (5) the apparent boundaries in geophysical fields as shapefile polylines; (6) the subglacial geologic provinces as shapefile polygons
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