Data Publications

Dome Fuji, Antarctica Core DF2 1-cm Electrical Conductivity Measurements

  • Japanese Antarctic Research Expedition
  • 2015
  • Dome Fuji, Antarctica Core DF2 1-cm Electrical Conductivity Measurements
  • A20180613-013
  • ice core
  • physical properties
  • DF2
  • Dome Fuji
  • Electrical Conductivity Measurements
  • Fujita, S., Parrenin, F., Severi, M., Motoyama, H., and Wolff, E. W.: Volcanic synchronization of Dome Fuji and Dome C Antarctic deep ice cores over the past 216 kyr, Clim. Past, 11, 1395-1416,, 2015.
  • Dome Fuji, Antarctica Ice Core DF2 1-cm Electrical Conductivity Measurements (ECM) at -20C for depth range 875 - 2200m.The climatic record from the 2nd Dome Fuji (Antarctica) ice core (DF2 core as 3035m deep ice core) was analyzed using ECM (electrical conductivity measurements). The DF2 core, reaching nearly to the ice sheet bed, was drilled in the period 2004-2007 at a site ~43 m away from the DF1 borehole. Mothod of the ECM measurement is as follows. After equilibrating for 1 day at the cold-room temperature at Dome F, all core sections, which were 93mm in diameter and about 1.5m long, were cut parallel to their central axes. The cut surfaces were further finished with a microtome knife to make fresh, smooth surfaces. Immediately after a surface was cut and finished, two ECM electrodes were dragged along the surface with a 400V d.c. potential difference. Although the signal was sampled every 2mm, we provide only 10mm running averages of the data to remove noise. The ECM electrodes were automatically dragged along the ice with a moter module. The electrodes were aligned perpendicular to the core axis and 15mm apart. The effective resolution of the electrodes approximately equaled the distance between the electrodes (15mm); based on a physical principle that the electrical field decreases inversely proportional to the distance from a given location to each electrode. Within this distance, about 65% of the lines of electrical force cross. Measurement temperature is -20C.In 2015, Fujita, Parrenin et al. (2015) volcanically synchronized two deep ice cores, Dome Fuji (DF) and EPICA Dome C (EDC), drilled at remote dome summits in Antarctica, to improve our understanding of their chronologies. For their study, the ECM data of the DF2 core were used from a limited depth range 875 - 2200m. Here, we open these data to the public. The data have two information of the depth. The first column is the depth of the DF2 core. The third column is the DF2 depths converted into equivalent depths of the DF1 core. The second column is the electrical current between the electrodes. Note that, in this version of the data, no actions for noise cleaning were done. Except the averaging for every 10mm, data is still a kind of raw data.
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