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Updated 12 October, 2003

Climate Action Report 2002
The United States of America's Third National Communication Under the United Nations Framework Convention on Climate Change
Chapter 6: Impacts and Adaptation
May 2002

FIGURE 6-9 Projected Reductions in Western Snowpack Resulting from Potential Changes in Climate

Climate model scenarios for the 21st century project significant decreases from the 1961 -- 1990 baseline in the average April 1 snowpack for four mountainous areas in the western United States. Scenarios from the Canadian model, which simulates warming toward the upper end of IPCC projections, and from the Hadley model, which simulates warming near the middle of IPCC projections, provide similar results. Such a steep reduction in the April 1 snowpack would significantly shift the time of peak runoff and reduce average river flows in spring and summer.

Source: Redrawn from McCabe and Wolock 1999, as presented in NAST 2000.

Projected Reductions in Western Snowpack Resulting from Potential Changes in Climate

 


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