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An Evaluation of Forest Snow Process Simulations
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2009 (English)In: Bulletin of The American Meteorological Society - (BAMS), ISSN 0003-0007, E-ISSN 1520-0477, Vol. 90, no 8, 1120-+ p.Article in journal (Refereed) Published
Abstract [en]

The Northern Hemisphere has large areas that are forested and seasonally snow covered. Compared with open areas, forest canopies strongly influence interactions between the atmosphere and snow on the ground by sheltering the snow from wind and solar radiation and by intercepting falling snow; these influences have important consequences for the meteorology, hydrology, and ecology of forests. Many of the land surface models used in meteorological and hydrological forecasting now include representations of canopy snow processes, but these have not been widely tested in comparison with observations. Phase 2 of the Snow Model Intercomparison Project (SnowMIP2) was therefore designed as an intercomparison of surface mass and energy balance simulations for snow in forested areas. Model forcing and calibration data for sites with paired forested and open plots were supplied to modeling groups. Participants in 11 countries contributed output from 33 models, and the results are published here for sites in Canada, the United States, and Switzerland. On average, the models perform fairly well in simulating snow accumulation and ablation, although there is a wide intermodal spread and a tendency to underestimate differences in snow mass between open and forested areas. Most models capture the large differences in surface albedos and temperatures between forest canopies and open snow well. There is, however, a strong tendency for models to underestimate soil temperature under snow, particularly for forest sites, and this would have large consequences for simulations of runoff and biological processes in the soil.

Place, publisher, year, edition, pages
2009. Vol. 90, no 8, 1120-+ p.
Keyword [en]
model intercomparison project, mountain pine-beetle, land-surface, boreal forest, climate-change, soil-temperature, parameterization, schemes, canopy reflectance, energy-balance, north-america
URN: urn:nbn:se:kth:diva-18804DOI: 10.1175/2009bams2629.1ISI: 000270269100007ScopusID: 2-s2.0-70450159805OAI: diva2:336851
QC 20100525Available from: 2010-08-05 Created: 2010-08-05 Last updated: 2010-12-21Bibliographically approved

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Gustafsson, David
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Land and Water Resources Engineering
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