An inversion method for laser radar data of atmospheric particulate matter particle size spectrum spatial and temporal distribution

Abstract

The present invention discloses an inversion method for laser radar data of atmospheric particulate matter particle size spectrum spatial and temporal distribution. The method comprises: by measuring back scattered echo signal of atmospheric particulate matters via laser radar, accurately inverting to obtain extinction coefficients of atmospheric particulate matters in three wavelengths of infrared, visible and ultraviolet bands at different heights from the ground; building lognormal distribution spectral functions of four aerosol components and parameters thereof, for obtaining refractive indexes at different bands of different aerosols and the mixing ratio of the four aerosol components in different aerosol modes; obtaining the particle size spectrum normalized at 0.55 micron of the extinction coefficient of each aerosol basic component, and comparing with a standard spectrum for authentication; and finally performing iterative calculation to the extinction coefficient spectrums obtained by laser radar surveying to obtain the aerosol mixed volume ratio of each height, thus obtaining atmospheric particulate matter particle size distribution of different heights at different times. According to the inversion method of the invention, valid data are provided for analysis and study of particle properties and variation patterns, especially, an effective means for spatial and temporal change detection for the particle-size spectrum of the atmospheric particulate matters is provided, and active three-dimensional telemetry technology suitable for atmospheric particulate matter particle size distribution is established.

Description

technical field [0001] The invention relates to the fields of environmental science and laser radar, in particular to a laser radar data inversion method for the particle size spectrum of atmospheric particles. Background technique [0002] The impact of particulate matter on the global atmospheric environment is becoming more and more serious. It is obvious that atmospheric particulate matter aggravates air pollution, damages people's health, affects normal production and life, and destroys the ecological balance of nature. In recent years, the global energy consumption has been increasing year by year. Although the global air pollution has been initially controlled, the quality of the air environment in my country (especially the quality of the urban air environment) has not improved fundamentally, especially the atmospheric pollution caused by sulfur dioxide, smoke and dust. The form of pollution is still serious, and the situation of urban air quality exceeding the standa...

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Problems solved by technology

[0003] At present, most of the monitoring and research on the particle size distribution of atmospheric particles are carried out on the ground layer by using traditional point instruments. , traditional monitoring methods are difficult to obtain effective data and analysis results

The particle size monitoring of high-altitude particles can be carried out using platforms such as sounding balloons, airplanes, airships or iron towers, equipped with traditional instruments for monitoring, but the disadvantages of these methods for particle size monitoring of high-altitude particles are obvious, and they cannot achieve long-term continuous monitoring. At present, my country lacks long-term effective three-dimensional monitoring technologies and methods for the particle size distribution of atmospheric particles.

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