Fig. 2
From: Assessing and projecting surface air temperature conditions required to sustain permafrost in Japan
Distribution of regions with surface air temperatures that favor the maintenance of permafrost (the Environmentally Conditioned Permafrost regions) in Japan under the current climate conditions (averaged over 1999–2018); (1) Daisetsu Mountains, (2) Hidaka Mountains, (3) Northern Japan Alps, (4) Mt. Fuji, (5) Mt. Shiretokodake, (6) Mt. Sharidake, (7) Southern Japan Alps, (8) Mt. Akandake, and (9) Mt. Yotei. The distribution of the environmentally conditioned permafrost region is based on probabilities estimated by nine bias-corrected climate scenarios. Red points indicate sites where permafrost has been observed. The observations of sporadic permafrost in Shikaribetsu and Oketo are shown as ▼, and other observations are shown as + . See Additional file 1: Table S1 for details. The contour interval is 400 m