DIAGNOSING THE DIURNAL SURFACE-ENERGY BALANCE OVER THE SUMMER TUNDRA AT PRINCESS MARIE BAY FROM SIMPLE SHORT-PERIOD MEASUREMENTS

Using existing physical parameterizations, a new mathematical model is formulated to diagnose the diurnal variation of the energy fluxes and temperature on the snow-free tundra surface at Princess Marie Bay, El lesmere Island, Canada. The input to the model consists of three meteo rological variables which can be readily measured by an automatic weat her station: incoming short-wave radiation, windspeed and screen level temperature. The model is based on the one-dimensional heat conductio n equation for unfrozen soil, with surface heat exchange by short- and long-wave radiation and by convection and evaporation. A permafrost s urface is used as a lower boundary condition. The model is formulated and tuned using a series of data from the Princess Marie Bay site. It is then tested using a separate data set from the same site and an ind ependent data set from a nearby site.