Method for inverting function relationship between aerosol extinction coefficient moisture absorption increasing factor and relative humidity by adopting PM2.5 mass concentration as constraint condition

Abstract

The present invention discloses a method for inverting the function relationship between the aerosol extinction coefficient moisture absorption increasing factor and the relative humidity by adopting the PM2.5 mass concentration as the constraint condition. According to the method, the determined aerosol extinction coefficient alpha dry at the relative humidity of no more than 40% and the PM2.5 mass concentration CPM2.5 are substituted into the formula defined in the specification to calculate the proportional coefficient K, the aerosol extinction coefficient alpha wet and the PM2.5 mass concentration CPM2.5 at the arbitrary relative humidity are determined at the same position, the proportional coefficient K and the PM2.5 mass concentration CPM2.5 at the arbitrary relative humidity are substituted into the formula alpha=K.CPM2.5 to calculate the dry aerosol extinction coefficient alpha dry at the arbitrary relative humidity, the determined alpha wet and the calculated alpha dry are substituted into the formula defined in the specification to calculate the aerosol extinction coefficient moisture absorption increasing factor f, the calculation process of the f is repeatedly performed at least 5 times, and the two groups of the data such as the relative humidity RH of atmosphere determined at the same position and the calculated aerosol extinction coefficient moisture absorption increasing factor f are subjected to fitting to obtain the function relationship. According to the present invention, with the method, the PM2.5 mass concentration in the height range of 0-30 km on the ground can be conveniently detected at any time in a low cost manner.

Description

technical field [0001] The invention relates to a method for inverting the relationship between the aerosol extinction coefficient hygroscopic growth factor and relative humidity function, especially a method for inverting the relationship between the aerosol extinction coefficient hygroscopic growth factor and relative humidity function using PM2.5 mass concentration as a constraint condition method. Background technique [0002] Atmospheric aerosol refers to the general term for solid and liquid particles suspended in the atmosphere with particle diameters between 0.001 and 100 μm. PM2.5 refers to aerosol particles with a diameter of less than 2.5 μm, which is an important part of aerosols in the atmosphere . In recent years, air pollution has attracted widespread attention. As one of the main air pollutants, PM2.5 can be suspended in the air for a long time. The higher its concentration in the air, the more polluted the air is. serious. At present, the method of detect...

AI Technical Summary

Problems solved by technology

Although this method can measure PM2.5 in the atmosphere, limited by the height of the platform where the PM2.5 mass concentration monitor is located, it can only detect PM2.5 within a height range of ≤30m. If you want to detect PM2.5 in a higher range. 5, you need to use a high-altitude balloon platform or an aircraft platform, which is difficult to detect PM2.5 in real time at any time, and greatly increases the cost of detection, and is extremely inconvenient and time-consuming

In addition, although lidar is also a powerful tool for detecting atmospheric aerosols, it only detects the extinction coefficient or backscattering coefficient of atmospheric aerosols, and cannot directly detect the mass concentration of PM2.5 in the atmosphere

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