Concentration of hydrogen ions measured with the Electrical Conductivity Method (ECM) on the NGRIP ice core ...

• Main Authors: 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 Møllesøe, Wilhelms, Frank, Winstrup, Mai
• Format: Dataset
• Language: English
• Published: PANGAEA 2013
• Subjects: DEPTH, ice/snow; Hydrogen ion concentration; Ice drill; Electrical conductivity method, ECM Hammer, 1980; NGRIP; Sampling/drilling ice; North Greenland Ice Core Project NGRIP; Greenland; Greenland ice core; Greenland Ice core Project; ice core; North Greenland; North Greenland Ice Core Project
• Online Access: https://dx.doi.org/10.1594/pangaea.831526; https://doi.pangaea.de/10.1594/PANGAEA.831526

The ECM data has been temperature corrected to a standard temperature of -14 °C, according to an Arrhenius relationship using an activation energy of 0.23 eV. Subsequently, the measured current has been converted to ice acidity using the relationship suggested by Hammer (1980). For more information on the calibration procedure see Rasmussen et al, 2013.Due to the manual approach of the applied ECM technique depth assignment is only accurate to within 1-2 cm. Data in areas of breaks have been removed from the resulting data sets, and data has been downsampled to 1 cm resolution.The ECM data was obtained in the field during the NGRIP field seasons. It consists of data from NGRIP1 (9.84-1371.69 m depth) and NGRIP2 (1346.41-3084.99 m depth). The NGRIP1 core reaches down to a depth of 1372 m. The NGRIP2 core (drilled 20 meters away from the NGRIP1 core) reaches from surface to bedrock, but high-resolution measurements have only been carried out downwards from 1346 m. In the 26 m overlap zone, the cores are offset ...