Estimation of annual layer thickness from stratigraphical analysis of Dome Fuji deep ice core

• Main Authors: Hideki Narita, Nobuhiko Azuma, Takeo Hondoh, Akira Hori, Tadayasu Hiramatsu, Michiko Fujii-Miyamoto, Kazuhide Satow, Hitoshi Shoji, Okitsugu Watanabe
• Format: Report
• Language: English
• Published: scientific paper 2003
• Subjects: annual layer thickness; air bubble; air hydrate; deep ice core; Greenland; Dome Fuji; Greenland ice core; ice core; Ice Sheet; Memoirs of National Institute of Polar Research; Polar Research
• Online Access: https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=2461; http://id.nii.ac.jp/1291/00002461/; https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=2461&item_no=1&attribute_id=18&file_no=1

Dating of ice cores is of important but is difficult for an ice core where there is low snow accumulation, and also for the deep part because seasonal chemical and isotopic signals are not easily preserved due to vapor migration after snow deposition and molecular diffusion in the deep part of ice sheet. In this paper, an attempt to reveal annual layer thickness is conducted on the basis of precise number density measurement of air bubbles and air hydrates. The annual layer thickness from air bubbles and hydrates agrees well with a calculated value within 10-15% at all depths of the 2500 m deep core. The obtained thickness in the interglacial period according to Eemian period in the Greenland ice core was half of the calculated value.