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Professional Paper 1386–A

Chapter A–4 (Figure 27)

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Figure 27, A, Freeze-up and break-up records and B, ice-duration records for selected lakes and rivers in the Northern Hemisphere. The original data have been smoothed with an 11-year running average filter. Originally published by Magnuson and others (2000), the data were obtained from the National Snow and Ice Data Center, Boulder, Colo. (See also table 1.)

Figure 27.A, Freeze-up and break-up records and B, ice-duration records for selected lakes and rivers in the Northern Hemisphere. The original data have been smoothed with an 11-year running average filter. Originally published by Magnuson and others (2000), the data were obtained from the National Snow and Ice Data Center, Boulder, Colo. (See also table 1.)



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