Effects of precipitation downscaling method on evapotranspiration simulation of land surface model
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Abstract:
In order to recognize the effects of precipitation intensity and duration on the evapotranspiration, temporal downscaling simulation of daily precipitation in Changbaishan area is conducted using the weather generator of IBIS ( Integrated Biosphere Simulator) model and a precipitation downscaling model based on precipitation intensity and duration. The calculated hourly precipitation is used as the meteorological drive and evapotranspiration is simulated using the IBIS model. The results show that the precipitation intensity simulated by the weather generator of IBIS model is obviously lower, leading to a higher evapotranspi 2 ration, while the results from the precipitation downscaling model match the observation data well. The accuracy of evapotrans2 piration simulation can be improved with the accurate precipitation downscaling. In addition, through the comparison of evapo2 transpiration variation under different schemes of precipitation intensity and duration based on two precipitation events in 2004, stronger precipitation intensity and shorter precipitation duration can decrease the total evapotranspiration and the proportion of canopy interception evaporation, and increase the proportion of soil evaporation and plant transpiration under the same daily pre 2 cipitation.
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