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Optical Depth Inversion Technique Under Joint Cloud Measurement System

To improve the accuracy of all-sky cloud detection of ground-based infrared cloud-measuring system the corresponding relation between downwelling infrared radiation and optical depth of clouds was simulated by Santa Barbara DISTORT Atmospheric Radiative Transfer SBDART model The simulation result shows that it is feasible to invert optical depth by fitting its curve On this basis a new method under a combination of infrared and laser technologies was proposed First more accurate atmospheric profiles and precipitable water vapor applicable to specific regions and seasons were established Simultaneously the aerosol and cloud base height were inverted by laser extinction profiles Second the atmospheric parameters obtained above were substituted into SBDART to simulate the cloud optical depth inversion curve at zenith Finally the optical depth distribution of the all-sky clouds could be inverted by the curve The experimental results reveal that the distribution of the all-sky optical depth obtained from the inversion curve of single- and two-layer clouds is consistent with the distribution of the all-sky radiation Moreover the optical depth of clouds at different heights in the all-sky is clearly distinguished