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In the Cold Air Pockets that Form in Senjogahara, Oku-Nikko, Budding Is Delayed and Autumn Foliage Appears Earlier than in the Surrounding Highlands | 2026 | National Institute for Environmental Studies

Summary by nies.go.jp
In Senjogahara, a depression located in Nikko City, Tochigi Prefecture, a phenomenon called "cold air pockets" occurs on clear, calm nights, where the temperature is relatively lower than the surrounding slopes. As a result of this phenomenon, it has been found that in Senjogahara, the budding of deciduous trees is delayed compared to the surrounding higher-altitude slopes, while the yellowing/redning of leaves occurs earlier. The timing of pla…
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In Senjogahara, a depression located in Nikko City, Tochigi Prefecture, a phenomenon called "cold air pockets" occurs on clear, calm nights, where the temperature is relatively lower than the surrounding slopes. As a result of this phenomenon, it has been found that in Senjogahara, the budding of deciduous trees is delayed compared to the surrounding higher-altitude slopes, while the yellowing/redning of leaves occurs earlier. The timing of pla…

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nies.go.jp broke the news on Thursday, November 12, 2026.
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