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Sensitivity of mass balance of five Swiss glaciers to temperature changes assessed by tuning a degree-day model

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Abstract:

A degree-day model is used to assess the sensitivity of the mass balance of five Swiss glaciers to temperature changes. The model uses temperature data extrapolated from nearby climate stations, and is tuned by varying precipitation to make the model fit the observed distribution of mass balance with altitude. Once the model is tuned, the effect of temperature change is simulated by recalculating the mass balance with the same parameters as before, but with a temperature increase of 1°C throughout the year. The largest mass-balance changes, involving increased ablation of > 1m w.e. a-1 °C-1, occur at the snout, with a progressively smaller increase with altitude. The area-averaged sensitivities for the five glaciers are -0.7 to -0.9 m w.e.a-1°C-1. If annual precipitation also increased by 20% it would partly offset the effect of the 1°C higher temperatures but could not compensate for it.

Document Type: Research Article

DOI: http://dx.doi.org/10.3189/172756500781833511

Publication date: January 1, 2000

More about this publication?
  • The Journal of Glaciology is published six times per year. It accepts submissions from any discipline related to the study of snow and ice. All articles are peer reviewed. The Journal is included in the ISI Science Citation Index.
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igsoc/jog/2000/00000046/00000152/art00002
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