Cloud base height inversion method based on satellite-borne multi-channel radiation imager

Abstract

The invention discloses a cloud base height inversion method based on a satellite-borne multi-channel radiation imager. The cloud base height inversion method comprises the following steps: carrying out cloud detection by utilizing observation data of the satellite-borne multi-channel radiation imager; for a single-layer cloud pixel, calculating a cloud water path according to the cloud optical thickness and the cloud effective particle radius; analyzing the relationship between the cloud water path, the cloud top height and the environment factor and the effective cloud water content by using multi-source satellite observation data, and establishing a lookup table of the effective cloud water content; an effective cloud water content estimation value is obtained through the lookup table, and then the cloud water path is divided by the effective cloud water content to obtain the cloud geometric thickness; subtracting the calculated cloud geometric thickness from a known cloud top height inversion result to obtain a cloud bottom height inversion result of the target single-layer cloud; estimating the cloud bottom height of the multilayer cloud by using an extrapolation method; and verifying an inversion result, and optimizing the algorithm. According to the method, better effective cloud water content estimation can be obtained, and the cloud base height can be quickly and effectively inverted; and indirectly inverting the height of the cloud base of the multi-layer cloud by using an extrapolation method.

Description

technical field [0001] The invention belongs to the technical field of atmospheric detection and remote sensing, and in particular relates to a cloud base height inversion method based on a spaceborne multi-channel radiation imager. Background technique [0002] Cloud base height is an important satellite meteorological product, which is widely used in climate change research and aerospace meteorological support. However, at present, domestic Fengyun meteorological satellites do not have cloud base height products based on on-board multi-channel radiation imagers. The spaceborne multi-channel radiation imager measures visible light and infrared radiation from the earth-air system from space, and has the advantages of high spatial and temporal resolution and wide observation and inversion. The radiation measured by the spaceborne multi-channel radiation imager is mainly determined by the cloud top, and cannot directly reflect the information of the cloud base. Therefore, the ...

AI Technical Summary

Problems solved by technology

However, actual clouds are diverse and complex, and existing algorithms often have large uncertainties

Using accurate radar detection results to verify, it is also found that the cloud base height inversion results of existing algorithms have large deviations

In addition, since the inversion of the cloud top height and cloud optical parameters of multilayer clouds by the spaceborne multi-channel radiation imager generally has large errors, using existing algorithms to directly invert the cloud base height of multilayer clouds may have a more significant effect. deviation

These shortcomings of existing algorithms limit the scientific research and business application of cloud base height

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