Bulletin of Glaciological Research
Online ISSN : 1884-8044
Print ISSN : 1345-3807
ISSN-L : 1345-3807
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Permafrost occurrence at Mt. Sashirui, Shiretoko mountain range, eastern Hokkaido, Japan
Hiroshi OHNO, Shuya NAKAMURA, Gen TERAYAMA, Yuta KUMAGAI, Kengo HASHIMOTO, Tatsuya WATANABE, Akihiro HACHIKUBO, Kazutaka TATEYAMA, Hiroshi ADACHI, Ryota ADACHI, Keisuke TSUKAYA, Ken SATO, Keiichiro HATA, Satoshi KOMAMIYA, Kazutoshi SATO, Hirotsugu MINAMI
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Keywords: Permafrost occurrence, Shiretoko
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2025 Volume 43 Pages 1-7

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Abstract

After conducting 5.5 m borehole temperature measurements near the summit of Mt. Sashirui, Hokkaido, Japan, the first occurrence of permafrost in the Shiretoko mountain range has been newly confirmed. The observation point, a wind-swept site, is covered by an alpine wind-exposed dwarf shrub community. The observation of mean annual ground surface temperature and the estimation of mean annual air temperature at this point were both close to the thresholds of onset of permafrost formation. However, thermal insulation by bryophyte and lichen cover in summer and effective heat transfer through frozen shrub branches and a thin snow layer during cold spells are likely to sustain this permafrost. Continuous long-term measurements of ground temperatures at this site are expected to be important for monitoring climate change in mountain areas of the Shiretoko region.

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© 2025 Japanese Society of Snow and Ice
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