PM2.5 mass concentration value automatic ??inversion algorithm based on sun photometer and lidar

Abstract

The present invention relates to a PM2.5 mass concentration value automatic ??inversion algorithm based on a sun photometer and lidar. The ??inversion algorithm includes: firstly making use of the sun photometer to obtain optical thickness of the entire layer of atmospheric aerosol based on the sun photometer, obtaining entire layer of atmospheric aerosol extinction coefficient and aerosol optical thickness by the inversion algorithm based on lidar by using lidar echo signal after correction of distance and relative humidity, then making use of ideal curve fitting to determine the boundary layer height, obtaining the aerosol optical thickness of the boundary layer, and finally obtaining the PM2.5 mass concentration value based on the model by using the above results. The ??inversion algorithm makes use of the aerosol extinction coefficient profile and the optical thickness value obtained from the sun photometer and the lidar and combines ground relative humidity correction with boundary layer height information to get the value of PM2.5 mass concentration near the ground, and has the advantages of small error, high discernment, and strong universality.

Description

technical field [0001] The invention relates to the technical field of aerosol optical detection, in particular to an automatic inversion algorithm for PM2.5 mass concentration values ​​based on a sun photometer and a laser radar. Background technique [0002] PM2.5 refers to particulate matter in the air with an aerodynamic equivalent diameter of less than or equal to 2.5 microns. Compared with large-diameter particles, PM2.5 has a smaller particle size, which is easy to carry toxic and harmful substances such as heavy metals and organic substances, and stays in the atmosphere. The time is long and the transportation distance is long, so it has a greater impact on human health and the quality of the atmospheric environment. At present, the measurement of PM2.5 mass concentration can be carried out by manual weighing method (balance weighing method) and automatic monitor. The spatial distribution of PM2.5 was not available. The sun photometer and lidar can better retrieve ...

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Problems solved by technology

[0003] The purpose of the present invention is to provide an automatic inversion algorithm of PM2.5 mass concentration value based on the sun photometer and laser radar, to solve the problem that the traditional method has large errors, is affected by the measurement location, and cannot better identify the required information question

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