Rasmussen, Sune Olander; Vinther, Bo Møllesøe; Freitag, Johannes; Kipfstuhl, Sepp (2023): Density of snow trench samples from the EastGRIP site [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.962757, In: Rasmussen, SO et al. (2023): EastGRIP snow-pack and ice-core densities (measured and modelled) [dataset bundled publication]. PANGAEA, https://doi.org/10.1594/PANGAEA.962754
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Abstract:
We here report measured densities from a combination of records from the EastGRIP ice-core site. The data come from a trench and two ice cores: the shallow EGRIP-S6 core and the deep main core of the project. Based on these data, we parametrize the density as a function of depth, allowing us to provide a standard transfer function between true depth and ice-equivalent depth which is consistent with the EGRIP density measurements. EGRIP density data are only available to 117 m depth, at which depth the density is about 900 kg/m^3 and the difference between true depth and ice-equivalent depth is about 22 m. The density and overburden profiles have been extended below this depth and all the way to 1200 m in order to provide a convenient, continuous and (mostly) smooth transfer function between true depth and ice-equivalent depth. See PDF file provided under 'Documentation' for full description of data and parametrization.
Documentation:
Rasmussen, Sune Olander; Vinther, Bo Møllesøe; Freitag, Johannes; Kipfstuhl, Sepp (2023): A standardized EGRIP density profile and transfer function between true depth and ice-equivalent depth. Centre for Ice and Climate, Section for the Physics of Ice, Climate and Earth, Niels Bohr Institute, University, Notes_on_EGRIP_density_fitting.pdf
Project(s):
East Greenland Ice-core Project (EGRIP)
Coverage:
Latitude: 75.630000 * Longitude: -36.000000
Date/Time Start: 2016-06-01T00:00:00 * Date/Time End: 2016-08-31T00:00:00
Minimum DEPTH, ice/snow: 0.5 m * Maximum DEPTH, ice/snow: 4.5 m
Event(s):
Comment:
Dataset of averaged liner densities calculated from liners retrieved in 2016 from two 5 m deep and 50 m long trenches located approx. 500 m away from EGRIP main dome sampled with snow liners every 5 m (in total 20 liners per depth interval). 5 points covering the upper 5 m.
Accuracy: Since the sampling was performed with carbon-fibre tubes manufactured with uncertainties less than 0.1 mm in diameter and height the main source of error comes from the sampling routine itself. Here we assume an uncertainty of 0.5 cm in height for the sampled snow within the tube and for the core cuts in the field (<1% in volume estimate). The weight of the snow and ice samples was measured with an uncertainty of 1 g giving uncertainties of sample weights less than 1 per mil. The overall uncertainty of calculated density for the meter-segments is therefore less than 1%.
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | DEPTH, ice/snow | Depth ice/snow | m | Freitag, Johannes | Geocode – Mean depth of 1-meter sections | |
| 2 | Density, ice | Density ice | kg/m3 | Freitag, Johannes |
Status:
Curation Level: Enhanced curation (CurationLevelC) * Processing Level: PANGAEA data processing level 3 (ProcLevel3)
Size:
5 data points