Differential Radiothermal Methods for Satellite Retrieval of Atmospheric Humidity Profile |
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Authors: | V V Sterlyadkin E V Pashinov A V Kuzmin E A Sharkov |
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Institution: | 1.Space Research Institute,Moscow,Russia;2.Moscow State Institute of Radio Engineering,Moscow,Russia |
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Abstract: | The existing radiometric methods for measuring the profile of the water-vapor concentration from spacecrafts are analyzed. Questions of the sensitivity of radiometric measurements to a deviation in the water-vapor concentration from the standard profile are considered. It is shown that the traditional measurements near absorption line 183 GHz have a low sensitivity to a change in the water-vapor concentration in the lower troposphere. A new differential method of humidity measurement in the lower troposphere has been proposed based on measurements near the 22-GHz line. The advantages of differential measurements near 22 GHz when compared to similar measurements in the vicinity of 183 GHz are confirmed by the results of computer simulation. |
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