All-weather cloud phase inversion method based on MERS-II instrument carried by polar orbit meteorological satellite

Abstract

The invention relates to the field of meteorological analysis, and discloses an all-weather cloud phase inversion method based on an MERS-II instrument carried by a polar orbit meteorological satellite, and the method specifically comprises the steps: calculating an effective absorption optical thickness, namely beta, through employing an effective cloud emissivity obtained by a thermal infrared channel carried by a polar orbit meteorological satellite multispectral imager; for beta ratios of different channel combinations, liquid water clouds and ice clouds can be distinguished within the radius range of most effective particles. The cloud phase state is judged through a series of detection such as low surface emissivity detection, opaque cloud detection, water vapor channel multi-layer cloud detection, infrared window area channel multi-layer cloud detection, homogeneous freezing detection, water vapor channel ice cloud detection, secondary ice cloud detection, mixed phase state cloud detection and multi-cooling liquid state cloud detection by combining and using a beta ratio and brightness temperatures of different channels. By implementing the technical scheme of the invention, the limitation of the zenith angle of the sun is avoided, so that the all-weather cloud phase inversion product of the polar orbit meteorological satellite can be obtained.

Description

technical field [0001] The invention relates to the field of meteorological analysis, in particular to an all-weather cloud phase inversion method based on a MERSI-II instrument carried by a polar-orbiting meteorological satellite. Background technique [0002] The Fengyun-3 (FY-3) meteorological satellite is my country's second-generation polar-orbiting meteorological satellite. Monitor a wide range of natural disasters and the ecological environment, and provide meteorological information for research on global environmental changes, exploration of global climate change laws, and ocean, agriculture, forestry, aviation, and military departments. Among them, the Medium Resolution Spectral Imager-Middle Resolution Spectral Imager (MERSI-II, Medium Resolution Spectral Imager) is the key imaging instrument of the FY-3 polar orbiting meteorological satellite. High-precision quantitative inversion of atmospheric, land, and ocean parameters such as water vapor, land surface charac...

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Problems solved by technology

[0004] In the prior art, the accurate inversion of the cloud phase state of polar orbiting meteorological satellites usually uses the visible light channel and the near infrared channel. Since the observations of the visible light and near infrared channels are not continuous, the cloud phase state can only be calculated during the daytime. products, and the inversion cannot be performed at night, so all-weather cloud phase products cannot be obtained

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