Figure 1. Time series of ice freeze and breakup dates from selected Northern Hemisphere lakes and rivers (1846 to 1995). Data were smoothed with a 10-year moving average. Locations and related information are in Table 1.
Figure 1. Time series of ice freeze and breakup dates from selected Northern Hemisphere lakes and rivers (1846 to 1995). Data were smoothed with a 10-year moving average. Locations and related information are in Table 1.