Table 2 Variations of the spatial extent and the southern boundary of the Mid-to-High latitude cold regions from 1901 to 2019.
From: Characteristics of the Northern Hemisphere cold regions changes from 1901 to 2019
Years | Cold regions | Southern boundary | |||
|---|---|---|---|---|---|
Area (107 km2) | The land area of the NH (%) | Trend (107 km2/10 a) | The mean latitude (°N) | Trend (°/10 a) | |
1901–2019 | 3.755 | 34.862 | − 0.028** | 49.48 | 0.144** |
1901–1930 | 3.857 | 35.801 | − 0.001 | 48.95 | 0.010 |
1931–1960 | 3.808 | 35.351 | 0.014 | 49.23 | -0.082 |
1961–1990 | 3.769 | 34.988 | − 0.042** | 49.42 | 0.230 |
1991–2019 | 3.582 | 33.254 | − 0.070** | 50.35 | 0.306 |
