Ice core analyses and borehole temperature measurements at the drilling site on Asgardfonna, Svalbard, in 1993 (scientific paper)

Two ice cores (184.62m and 49.21m depth) were drilled in the middle area of Åsgardfonna, northeastern part of Svalbard, by the Japanese Arctic Glaciological Expedition, 1993 (JAGE '93). None of them reached to the bedrock. Stratigraphic observation and bulk density measurement were carried out...

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Bibliographic Details
Main Authors: Tsutomu Uchida, Kokichi Kamiyama, Yoshiyuki Fujii, Akiyoshi Takahashi, Toshitaka Suzuki, Yoshitaka Yoshimura, Makoto Igarashi, Okitsugu Watanabe
Format: Report
Language:English
Published: Hokkaido National Industrial Research Institute/National Institute of Polar Research/National Institute of Polar Research/Geo. Tec. Co. Ltd./Department of Chemistry, Faculty of Science, Yamagata University/Biological Laboratory, Faculty of Science, Tokyo Institute of Technology/Department of Polar Science, The Graduate University for Advanced Studies, National Institute of Polar Research/ National Institute of Polar Research 1996
Subjects:
Arctic
Svalbard
ice core
Memoirs of National Institute of Polar Research
Polar Research
Online Access:https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=2300
http://id.nii.ac.jp/1291/00002300/
https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=2300&item_no=1&attribute_id=18&file_no=1
Description
Summary:Two ice cores (184.62m and 49.21m depth) were drilled in the middle area of Åsgardfonna, northeastern part of Svalbard, by the Japanese Arctic Glaciological Expedition, 1993 (JAGE '93). None of them reached to the bedrock. Stratigraphic observation and bulk density measurement were carried out for each ice core at the drilling site. The depth of the firn-ice transition was about 6m. Transparent layers and low density layers indicated the occurrence of several warm and cold climatic conditions in this region. In order to find the cause of the time gap observed in the ice core from Hoghetta, on top of Åsgardfonna, the stratigraphy of both ice cores was compared with each other. Temperature measurements in the boreholes showed a unique profile, that is, it had negative temperature gradient at depths from about 30m to 130m. Numerical calculation using a steady state model was applied to reconstruct the unique profile of ice temperature.

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