National Park Service LogoU.S. Department of the InteriorNational Park ServiceNational Park Service
National Park Service:  U.S. Department of the InteriorNational Park Service Arrowhead
North Cascades National Park Service ComplexNational Park Ranger
view map
text size:largestlargernormal
printer friendly
North Cascades National Park Service Complex
Recent Trends in Glacial Volume
Figures 15 and 16 are a summary of available data for all four glaciers and South Cascade Glacier for the past 15 years. The vertical axis is in meters of water equivalent (m.w.e.). The first two years (1993-1994) were clearly not good for these glaciers, as the net annual mass balances of all five glaciers were negative. 1995 marks a change evident by the positive mass balance of the east-side glaciers. This was unexpected, since we had anticipated that glaciers on the west slope of the range would be the first to show a positive year because they receive more snowfall. In reality, the east side glaciers receive a more consistent amount of snowfall and are better at conserving it due to their relatively high elevations and the fact that most are well shaded on the north sides of mountains. The years 1996 and 1997 were positive for all of the glaciers, and may have been the first consecutive years of positive balance since 1975-1976. Therefore, the two-year positive gain is by no means a long-term trend, as was confirmed by the return of negative net annual balances in 1998. Finally, we also have learned from this effort that South Cascade Glacier is not representative of all of the glaciers, particularly those on the east-slope.
 
Figure 15
Figure 15 - Net Balance Comparisons: All Glaciers
 
Figure 16
Figure 16 - Cumulative Balance of NOCA Glaciers
Did You Know?  

Did You Know?
Stephen Mather Wilderness comprises 93% of the North Cascades National Park Service Complex. About 400 miles of trail provide access to this rugged Wilderness.

Last Updated: May 05, 2008 at 19:09 EST