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Rasmussen, Sune Olander; Abbott, Peter M; Blunier, Thomas; Bourne, Mark; Brook, Edward J; Buchardt, Susanne L; Buizert, Christo; Chappellaz, Jérôme A; Clausen, Henrik Brink; Cook, Eliza; Dahl-Jensen, Dorthe; Davies, Siwan M; Guillevic, Myriam; Kipfstuhl, Sepp; Laepple, Thomas; Seierstad, Inger K; Severinghaus, Jeffrey P; Steffensen, Jørgen Peder; Stowasser, Christopher; Svensson, Anders M; Vallelonga, Paul T; Vinther, Bo M; Wilhelms, Frank; Winstrup, Mai (2013): Specific conductivity measured with the dielectric profiling (DEP) technique on the NEEM ice core. PANGAEA, https://doi.org/10.1594/PANGAEA.831522, In supplement to: Rasmussen, SO et al. (2013): A first chronology for the North Greenland Eemian Ice Drilling (NEEM) ice core. Climate of the Past, 9(6), 2713-2730, https://doi.org/10.5194/cp-9-2713-2013

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Source data set:
Wilhelms, Frank; Kipfstuhl, Sepp; Laepple, Thomas (2013): NEEM Ice Core Dielectric Profiling (DEP) Data. World Data Center for Paleoclimatology, Boulder and NOAA Paleoclimatology Program, ftp://ftp.ncdc.noaa.gov/pub/data/paleo/icecore/greenland/summit/neem/neem2013dep.txt
Coverage:
Latitude: 77.450000 * Longitude: -51.060000
Date/Time Start: 2009-05-01T00:00:00 * Date/Time End: 2009-08-20T00:00:00
Minimum DEPTH, ice/snow: 1757.310 m * Maximum DEPTH, ice/snow: 2537.065 m
Event(s):
NEEM * Latitude: 77.450000 * Longitude: -51.060000 * Date/Time Start: 2009-05-01T00:00:00 * Date/Time End: 2009-08-20T00:00:00 * Elevation: 2545.0 m * Recovery: 2533.21 m * Location: Greenland * Device: Ice drill (ICEDRILL)
Comment:
The dielectrical stratigraphy of the NEEM core was recorded in the field with the dielectric profiling (DEP) technique (Wilhelms et al., 1998). Ice core sections of 1.65-2.2 m were usually analysed no more than one day after drilling.
Approximately every day a free air measurement was recorded for data calibration. For each measurement the cable stray capacitance and conductance - as determined in the corresponding daily free air measurements - are subtracted from the respective capacitance and conductance records.
After multiplying the conductance with the vacuum permittivity, permittivity and conductivity are calculated by division with the free air capacitance.
The DEP data set is provided in processed form without correction for the temperature variation in the science trench or in the core-buffer. Therefore, care should be taken when interpreting the absolute levels between sections.
Parameter(s):
#NameShort NameUnitPrincipal InvestigatorMethodComment
1DEPTH, ice/snowDepth ice/snowmGeocode
2Conductivity, specificCondµS/mWilhelms, FrankDielectric profiling, DEP (Wilhelms et al., 1998)not temperature corrected
Size:
131536 data points

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