Method for acquiring complex refractive index of urban aerosol on basis of various ground-based remote sensing technologies

Abstract

The invention relates to a method for acquiring a complex refractive index of urban aerosol on the basis of various ground-based remote sensing technologies. The method comprises the following steps of: acquiring the extinction coefficient and the scattering extinction ratio of the aerosol through an inverse algorithm by virtue of Raman laser radar echo signals, and integrating the extinction coefficient of a certain route to acquire the optical thickness of the aerosol on the route; continuously correcting the extinction coefficient and the scattering extinction ratio by performing iterative alignment on an aerosol optical thickness of a whole atmospheric layer acquired via a sun photometer and the aerosol optical thickness acquired via a laser radar according to a Monte Carlo principle; then acquiring the particle size distribution of the aerosol via a particle spectrometer; and finally, acquiring the complex refractive index of the urban aerosol according to a mie-scattering model by virtue of the known scattering extinction ratio of the aerosol and the particle size distribution of the aerosol. According to the invention, the complex refractive index of the urban aerosol is acquired by the Raman laser radar, the sun photometer and the particle spectrometer, and the method has the advantages of small error, high discriminability and high universality.

Description

technical field [0001] The invention relates to the technical field of aerosol optical detection, in particular to a method for obtaining urban aerosol birefringence index based on various ground-based remote sensing technologies (Raman laser radar, solar photometer, particle spectrometer). Background technique [0002] The urban environment is an important factor for the sustainable economic and social development of a big city. The monitoring and analysis of the quality of the atmospheric environment above the city is related to the life and health of the urban people. Although the content of atmospheric aerosol is very small, it has an important direct and indirect impact on climate change, and is an important factor in urban climate change simulation and environmental remote sensing monitoring. Atmospheric aerosol birefringence index is an important parameter to express the optical characteristics of aerosol, which is determined by the chemical composition and particle s...

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Problems solved by technology

[0003] The purpose of the present invention is to provide a method for obtaining urban aerosol birefringence index based on a variety of ground-based remote sensing detection technologies, so as to solve the problems that the traditional method has large errors, complicated operation, and cannot obtain the required information well

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