Climate Dynamics

, Volume 30, Issue 2–3, pp 307–319 | Cite as

Warmer climate: less or more snow?

Article

Abstract

Changes in snow amount, as measured by the water equivalent of the snow pack (SWE), are studied using simulations of 21st century climate by 20 global climate models. Although the simulated warming makes snow season to shorten from its both ends in all of Eurasia and North America, SWE at the height of the winter generally increases in the coldest areas. Elsewhere, snow decreases throughout the winter. The average borderline between increasing and decreasing midwinter SWE coincides broadly with the −20°C isotherm in late 20th century November–March mean temperature, although with some variability between different areas. On the colder side of this isotherm, an increase in total precipitation generally dominates over reduced fraction of solid precipitation and more efficient melting, and SWE therefore increases. On the warmer side, where the phase of winter precipitation and snowmelt are more sensitive to the simulated warming, the reverse happens. The strong temperature dependence of the simulated SWE changes suggests that projections of SWE change could be potentially improved by taking into account biases in simulated present-day winter temperatures. A probabilistic cross verification exercise supports this suggestion.

Keywords

Climate change Climate projection Snow Snow water equivalent Snow depth 

Notes

Acknowledgments

We acknowledge the modeling groups for making their model output available as part of the WCRP’s CMIP3 multi-model dataset, the Program for Climate Model Diagnosis and Intercomparison (PCMDI) for collecting and archiving this data, and the WCRP’s Working Group on Coupled Modelling (WGCM) for organizing the model data analysis activity. The WCRP CMIP3 multi-model dataset is supported by the Office of Science, US Department of Energy. This paper benefited from the constructive comments of two anonymous reviewers.

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Copyright information

© Springer-Verlag 2007

Authors and Affiliations

  1. 1.Division of Atmospheric Sciences, Department of Physical SciencesUniversity of HelsinkiHelsinkiFinland

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