Abstract:
For frozen rivers and lakes with cold climate and frequent snowfall, the albedo of ice cover and snow cover has great influence on climate and ice thickness change. Using Fresnel theory, it is concluded that pure water and pure water ice can be calculated by the same albedo formula. Then, based on the existing prototype observation data, a general parameterization model of water-ice albedo is proposed. On this basis, referring to the parameterization model of CCSM3 snow-ice daily average albedo, a general parameterization model of water-ice-snow albedo is proposed, considering the latitude, the earth's rotation and the variation laws around the sun, thus making the model very universal. Calculation and analysis show that latitude and date have great influence on the daily average albedo of water, ice and snow, and the albedo varies with the date or month. The higher the latitude, the greater the albedo. Compared with the influence of ice thickness on albedo, the influence of solar altitude angle on latitude and date changes is much greater. The comparison between the calculation results of the general parameterization model of water-ice-snow albedo and the prototype observation results proves that the two are in good agreement, while the calculation results of the existing commonly used albedo model based on ice thickness are far from the observation results.