Physical and layered properties in the deep sections of the Dome Fuji ice core

Physical properties and layered structures data in the deep sections of the DF2 ice core were acquired. Dielectric anisotropy, indicator of the clustering strength of c-axes, was measured at 2.5 m intervals between the depths of 2400 and 2967 m using an open resonator with semi-confocal type having a flat mirror and a concave mirror. At each sampling depth, 0.5 m long ice core was assessed at 0.02 m intervals. Each ice core sample was formed into a slab shape with a thickness of 41-42 mm and width of 30-38 mm. Furthermore, the detailed distribution of c- and a-axes were determined using Laue X-ray diffraction technique. The median inclination, defined as one half of the apex angle of the cone in which one half of the measured c-axes were included from the center axis of the c-axes cluster, and the inclination angle of the c-axes cluster from the vertical were estimated. Geometrical corrections of the dielectric anisotropy to translate from the measured non-principal components to the principal components were applied using both the angle of inclination and horizontal orientation of the c-axes cluster as derived from c-axis fabric data acquired using X-ray diffraction technique.
Grain sizes and layer inclination measurements were conducted at the DF site. Dielectric anisotropy and Laue X-ray diffraction measurements were conducted at National Institute of Polar research and Institute of Low Temperature Science, Hokkaido University, respectively.