Modeling Forest Cover Influences on Snow Accumulation, Sublimation, and Melt

A comprehensive, physically based model of snow accumulation, redistribution, sublimation, and melt for open and forested catchments was assembled, based on algorithms derived from hydrological process research in Russia and Canada. The model was used to evaluate the long-term snow dynamics of a forested and an agricultural catchment in northwestern Russia without calibration from snow observations. The model was run with standard meteorological variables for the two catchments, and its results were tested against regular surface observations of snow accumulation throughout the winter and spring period for 17 seasons. The results showed mean errors in comparison to observations of less than 3% in estimating snow water equivalent during the winter and melt seasons. Snow surface evaporation and blowing snow were found to be small components of the mass balance, but intercepted snow sublimation removed notable amounts of snow over the winter from the forested catchment. Average snow accumulation was 15% higher in the open catchment, largely due to a lack of intercepted snow sublimation. Melt rates were 23% higher in the open than in the forest, but the effect on melt duration was suppressed by the smaller premelt accumulation in the forest. Only a moderate sensitivity of snow accumulation to forest leaf area was found, while a substantial variation was observed from season to season with changing weather patterns. This suggests that the ensemble of snow processes is more sensitive to variations in atmospheric processes than in vegetation cover. The success in using algorithms from both Canada and Russia in modeling snow dynamics suggests that there may be a potential for large-scale transferability of the modeling techniques.

[1]  S. T. Gower,et al.  Rapid Estimation of Leaf Area Index in Conifer and Broad-Leaf Plantations , 1991 .

[2]  John W. Pomeroy,et al.  Coupled Modelling of Forest Snow Interception and Sublimation , 1998 .

[3]  D. Gray,et al.  The Prairie Blowing Snow Model: characteristics, validation, operation , 1993 .

[4]  Teemu Kokkonen,et al.  Snow processes in a forest clearing and in a coniferous forest , 2002 .

[5]  D. Marks,et al.  Point simulation of seasonal snow cover dynamics beneath boreal forest canopies , 1999 .

[6]  J. Meiman.  Snow accumulation related to elevation, aspect, and forest canopy. , 1970 .

[7]  Matthew Sturm,et al.  A snow-transport model for complex terrain , 1998 .

[8]  D. Gluns,et al.  Snowfall interception on branches of three conifer species , 1991 .

[9]  John W. Pomeroy,et al.  Measurements and modelling of snow interception in the boreal forest , 1998 .

[10]  R. Harding,et al.  Evaporation of intercepted snow: measurement and modelling , 1998 .

[11]  T. Ohta,et al.  Seasonal variation of heat balance components over a Japanese red pine forest in snowy northern Japan , 1999 .

[12]  L. S. Kuchment,et al.  THE DETERMINATION OF THE SNOWMELT RATE AND THE MELTWATER OUTFLOW FROM A SNOWPACK FOR MODELLING RIVER RUNOFF GENERATION , 1996 .

[13]  R. Davis,et al.  Snow ablation modelling in a mature aspen stand of the boreal forest , 1998 .

[14]  T. Terajima,et al.  Energy balance above a boreal coniferous forest: a difference in turbulent fluxes between snow‐covered and snow‐free canopies , 1999 .

[15]  R. Essery,et al.  Sublimation of Snow from Coniferous Forests in a Climate Model , 2003 .

[16]  R. Granger,et al.  Sustainability of the western Canadian boreal forest under changing hydrological conditions. I. Snow accumulation and ablation , 1997 .

[17]  A. G. Price,et al.  Energy balance computations of snowmelt in a subarctic area , 1976 .

[18]  J. Pomeroy,et al.  Prairie and arctic areal snow cover mass balance using a blowing snow model , 2000 .

[19]  John W. Pomeroy,et al.  Prediction of seasonal snow accumulation in cold climate forests , 2002 .

[20]  John W. Pomeroy,et al.  Snowcover Accumulation, Relocation, and Management , 1995 .

[21]  W. Jeffrey.  Snow hydrology in the forest environment. , 1970 .

[22]  T. Davies,et al.  Seasonal Snowpacks: Processes of Compositional Change , 1991 .

[23]  A. Price,et al.  Surface Emissivities in A Boreal Forest During Snowmelt , 1984 .

[24]  John W. Pomeroy,et al.  Estimates of Threshold Wind Speeds for Snow Transport Using Meteorological Data. , 1997 .

[25]  Curtis E. Woodcock,et al.  Variation of snow cover ablation in the boreal forest: A sensitivity study on the effects of conifer canopy , 1997 .

[26]  D. H. Male.  Snowcover ablation and runoff , 1981 .

[27]  R. Swanson,et al.  Snow Distribution Patterns in Clearings and Adjacent Forest , 1986 .

[28]  Robert A. Metcalfe,et al.  A statistical model of spatially distributed snowmelt rates in a boreal forest basin , 1998 .

[29]  D. Miller.  Interception Processes During Snowstorms , 1964 .

[30]  R. Essery,et al.  Effect of covariance between ablation and snow water equivalent on depletion of snow-covered area in a forest , 2000 .

[31]  M. Woo,et al.  Simulation of snowmelt in a subarctic spruce woodland: 1. Tree model , 2000 .

[32]  Curtis E. Woodcock,et al.  Snow ablation modeling at the stand scale in a boreal jack pine forest , 1997 .

[33]  Dennis P. Lettenmaier,et al.  Measurement of snow interception and canopy effects on snow accumulation and melt in a mountainous maritime climate, Oregon, United States , 2002 .

[34]  John W. Pomeroy,et al.  Multiple‐scale modelling of forest snow sublimation: initial findings , 2000 .

[35]  T. Ohta,et al.  Characteristics of the heat balance above the canopies of evergreen and deciduous forests during the snowy season , 1999 .

[36]  John W. Pomeroy,et al.  A distributed model of blowing snow over complex terrain , 1999 .

[37]  John W. Pomeroy,et al.  WINTER RADIATION EXTINCTION AND REFLECTION IN A BOREAL PINE CANOPY: MEASUREMENTS AND MODELLING , 1996 .