[A-CC25] Glaciology

[ACC25-06] Assessing and projecting surface air temperature conditions required to sustain permafrost in Japan

*Tokuta Yokohata¹, Go Iwahana², Kazuyuki Saito³, Tetsuo Sueyoshi³, Noriko N Ishizaki¹ (1.National Institute for Environmental Studies, 2.University of Alaska, Fairbanks, 3.Japan Agency for Marine-Earth Science and Technology)

Keywords:Permafrost, Mountain region, Climate change

Permafrost covers a wide area of the Northern Hemisphere, including high-altitude mountainous areas and even at mid-latitudes. There is concern that the thawing of mountain permafrost can cause slope instability and substantially impact alpine ecosystems, and because permafrost in mountainous areas is difficult to observe, detailed analyses have not been performed on its current distribution and future changes. Although previous studies have observed permafrost only at a limited number of points in Japan (e.g., Daisetsu Mountains, Mt. Fuji, and Mt. Tateyama in the Northern Japan Alps), we show that permafrost potentially exists in nine domains in Japan (Daisetsu Mountains, Mt. Fuji, Northern and Southern Japan Alps, Hidaka Mountains, Mt. Shiretokodake, Sharidake, Akandake, and Yotei, see Figure). In the Daisetsu Mountains and Mt. Fuji, the environmental conditions required for maintaining at least some permafrost are projected to remain in the future if a decarbonized society is achieved (RCP2.6 or RCP4.5). However, if greenhouse gas emissions continue to increase (RCP8.5), the environmental conditions required for sustaining permafrost are projected to disappear in the second half of the twenty-first century. In other domains, the environmental conditions required for maintaining permafrost are either projected to disappear in the next ten years (Hidaka Mountains, Northern Japan Alps) or they have almost disappeared already (Southern Japan Alps, Mt. Shiretokodake, Sharidake, Akandake, and Yotei). Our projections show that climate change has a tremendous impact on Japan's mountain permafrost environment and suggests the importance of monitoring the mountain environment and considering measures for adapting to future climate change.
In the above study (Yokohata et al. 2022, https://progearthplanetsci.springeropen.com/articles/10.1186/s40645-022-00498-z), the permafrost was estimated based on empirical rules obtained from past studies, using temperature predictions for the land area of Japan. Currently, we are planning research to perform more reliable estimation based on a high-resolution calculation over the Japan land area using a land surface physical process model. We also plan to conduct observations to discover new permafrost in places that have not been confirmed so far. The progress of these studies will also be introduced in the presentation.