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Professional Paper 1386–A

Chapter A–2 (Figure 53)

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Figure 53.—Cumulative mass balances calculated for large glacierized regions. For these calculations, we used the time series of mass balance for all glaciers—more than 300 from time to time and from 30 to 100 with multiyear records (see http://www.nsidc.org). We weighted the annual mass-balance data for individual glaciers by their surface area and then by the aggregate surface area of 49 primary glacier systems (20 of them are shown in fig. 52). By the end of the 1980s, and more clearly during the 1990s, these cumulative curves for large glacierized regions show a significant shift toward accelerated loss of mass.

Figure 53. Cumulative mass balances calculated for large glacierized regions. For these calculations, we used the time series of mass balance for all glaciers—more than 300 from time to time and from 30 to 100 with multiyear records (see http://www.nsidc.org). We weighted the annual mass-balance data for individual glaciers by their surface area and then by the aggregate surface area of 49 primary glacier systems (20 of them are shown in fig. 52). By the end of the 1980s, and more clearly during the 1990s, these cumulative curves for large glacierized regions show a significant shift toward accelerated loss of mass.



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