(2) In the past 119 years, the rates of change in the spatial extent of the cold regions in the NH, the Mid-to-High latitude, and the Qinghai-Tibetan Plateau were − 0.030 × 10 7 km 2 /10 a, − 0.028 × 10 7 km 2 /10 a, and − 0.013 × 10 6 km 2 /10 a, respectively, showing an extremely significant decreasing trend.
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Characteristics of the Northern Hemisphere cold regions changes from 1901 to 2019.
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