A Study On Using Data Of Polar-orbit Meteorological Satellite To Retrieve The Gross Solar Radiant Energy On The Earth's Surface

Solar radiation is the main energy source of all activities which take place on the Earth. It is also the most important factor in which the Earth's climate comes into being. Solar radiation is decisive of the net radiation, energy exchange, weather and climate's being on the Earth's surface. The changes of solar radiation have important affect on agriculture, climate change and daily life. Therefore, it is theoretically and practically important to calculate precisely the energy of the solar radiation and ascertain their distributing on the Earth's surface. However, the result is spatially discrete and temporally incontinuous when we calculate the energy of the solar radiation on the Earth's surface using general meteorologic parameter. With the development of the Meteorological Satellite, the data of Polar-orbit Meteorological Satellite are widely applied to calculate the energy of the solar radiation on the Earth' s surface, for their advantage in spatial simultaneous observation to the atmosphere and the surface. In this paper, we founded a regression model based on the albedo of Polar-orbit Meteorological Satellite and observational data of the gross solar radiant energy on the Earth's surface after analyzed the physical foundations of relation between the albedo of Polar-orbit Meteorological Satellite and the gross solar radiant energy on the Earth's surface. In this regression model we defined the ratio of the gross solar radiant energy on the Earth's surface to the solar radiant energy on the top of the aerosphere as dependent, and subtract the albedo of the Earth's surface from the albedo of Polar-orbit Meteorological Satellite. When we extend this regression model to time-base, according to the theory of trapeziform integral, we calculate monthly total of the gross solar radiant energy by calculating the average daily total of the gross solar radiant energy in a month. The result of applying the regression model in practice indicates: The relative error between the results of using the albedo of Polar-orbit Meteorological Satellite to calculate the gross solar radiant energy on the Earth's surface and the observational data of the gross solar radiant energy on the Earth's surface is less than 3%. The precision of the result is superior to result of calculating the gross solar radiant energy on the Earth's surface by using general meteorologic parameter.