SnowDEM. Arolla

SnowDEM

Snow Distributed Energy Balance Model

SnowDEM is a distributed physically based energy balance model for application to snow and glacier covered mountain regions. It is fed with data from an automatic weather station on the glacier and computes hourly energy fluxes of :

Incoming and outgoing short-wave radiation, direct, diffuse and reflected from surrounding terrain. It approximates the ratio of direct to diffuse solar radiation and corrects accordingly for shading and topography. It takes into account different degrees of cloudiness. It also implemnts a simple parametric model of albedo estimation based on local accumulated melt.

Incoming and outgoing long-wave radiation, both atmospheric and emitted from surrounding ground. It approximates the effect of increased long wave due to clouds based on direct measurements.

Sensible and latent heat fluxes, a bulk method approach based on measured wind speed, temperature and relative humidity.

The model assumes a daily lapse rate for temperatures within the glacier boundary layer and a different one for temperatures outside the glacier. It implements a simple scheme for snow surface temperature calculation and it will allow data assimilation for the correction of modelled albedo, snow depth and snow water equivalent.

The model is still in the development phase, but some results can be seen at:

(To get an idea of the area covered by the DEM see the georeferencing section)

For more information contact Javier G. Corripio

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