The Cryosphere www.the-cryosphere.net 1994-0416 1994-0424 4 1 2010 10.5194/tc-4-67-2010 http://www.the-cryosphere.net/4/67/2010/ http://www.the-cryosphere.net/4/67/2010/tc-4-67-2010.html http://www.the-cryosphere.net/4/67/2010/tc-4-67-2010.pdf 67 75 2010-01-29 Forecasting temperate alpine glacier survival from accumulation zone observations M. S. Pelto mspelto@nichols.edu Environmental Sciences, Nichols College, Dudley, MA 01571, USA Temperate alpine glacier survival is dependent on the consistent presence of an accumulation zone. Frequent low accumulation area ratio values, below 30%, indicate the lack of a consistent accumulation zone, which leads to substantial thinning of the glacier in the accumulation zone. This thinning is often evident from substantial marginal recession, emergence of new rock outcrops and surface elevation decline in the accumulation zone. In the North Cascades 9 of the 12 examined glaciers exhibit characteristics of substantial accumulation zone thinning; marginal recession or emergent bedrock areas in the accumulation zone. The longitudinal profile thinning factor, <i>f</i>, which is a measure of the ratio of thinning in the accumulation zone to that at the terminus, is above 0.6 for all glaciers exhibiting accumulation zone thinning characteristics. The ratio of accumulation zone thinning to cumulative mass balance is above 0.5 for glacier experiencing substantial accumulation zone thinning. Without a consistent accumulation zone these glaciers are forecast not to survive the current climate or future additional warming. The results vary considerably with adjacent glaciers having a different survival forecast. This emphasizes the danger of extrapolating survival from one glacier to the next. % vor jede Referenz Andreassen, L. M., Paul, F., Kääb, A., and Hausberg, J. 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