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Declining Mountain Snowpack in Western North America

TitleDeclining Mountain Snowpack in Western North America
Publication TypeJournal Article
Year of Publication2005
AuthorsMote, P. W., A. F. Hamlet, M. P. Clark, and D. P. Lettenmaier
JournalBulletin of the American Meteorological Society
Date PublishedJAN 2005
ISBN Number0003-0007
Keywordsclimate-change, COLUMBIA RIVER-BASIN, HYDROLOGY, pacific-northwest, PRECIPITATION, temperature, trends, united-states, WATER-RESOURCES

In western North America, snow provides crucial storage of winter precipitation, effectively transferring water from the relatively wet winter season to the typically dry summers. Manual and telemetered. measurements of spring snowpack, corroborated by a physically based hydrologic model, are examined here for climate-driven fluctuations and trends during the period of 1916-2002. Much of the mountain West has experienced declines in spring snowpack, especially since midcentury, despite increases in winter precipitation in many places. Analysis and modeling show that climatic trends are the dominant factor, not changes in land use, forest canopy, or other factors. The largest decreases have occurred where winter temperatures are mild, especially in the Cascade Mountains and northern California. In most mountain ranges, relative declines grow from minimal at ridgetop to substantial at snow line. Taken together, these results emphasize that the West's snow resources are already declining as earth's climate warms.

DOIDOI 10.1175/BAMS-86-1-39
Reference number


Short TitleDeclining Mountain Snowpack in Western North America
Citation Key491