Foundation cloud measuring method combining infrared and lasers

Abstract

A foundation cloud measuring method combining infrared and lasers comprises the following steps that (1) atmosphere downward infrared radiation data are obtained through an uncooled infrared focal planar array sensor, zenith backward extinction coefficient profile data are obtained through a laser sensor, and the obtaining time of the atmosphere downward infrared radiation data is synchronous with the obtaining time of the zenith backward extinction coefficient profile data; (2) water vapor and aerosol radiation under cloud are estimated by combining the data, clear sky threshold values calculated through a radiation transmission pattern are used for conducting initial cloud detection, it is assumed that the cloud is a black body, and the cloud base height is obtained through inversion; (3) sequence analysis is conducted on infrared radiation images with high time resolution, the clear sky threshold values are combined to conduct further cloud detection, and the cloud cover is calculated; (4) proportionality coefficients between the cloud base height obtained through the infrared radiation inversion and the cloud base height obtained through laser measurement are fitted; (5) the cloud base height of a whole view field is corrected, and the typical cloud base heights of every ten minutes are obtained through calculation.

Description

technical field [0001] The invention relates to a ground-based cloud measurement method, in particular to a method for cloud detection and full-field cloud base height correction in combination with ground-based infrared and laser light, which is mainly used in automatic measurement of ground meteorological observation. Background technique [0002] Clouds usually cover about 50% of the Earth's atmosphere and are the main regulator of the radiation budget of the Earth-atmosphere system. Cloud observations have always been the basis for climate research, weather analysis and forecasting. For a long time, visual observation has been a commonly used method to estimate cloud amount and determine cloud height in meteorological operations. The description of the sky is also more difficult. At present, the main ground-based cloud measurement technology systems include visible light passive remote sensing system, infrared passive remote sensing system and laser active remote sensi...

AI Technical Summary

Problems solved by technology

[0005] To sum up, the two technical systems that are most likely to realize the operationalization of cloud measurement, infrared passive remote sensing cloud and laser active remote sensing cloud, still have problems to varying degrees, and cannot completely replace manual visual inspection.

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