Ground-based laser radar aerosol inversion method and system based on laser radar satellite

Abstract

The invention provides a ground-based laser radar aerosol inversion method and system based on a laser radar satellite, and the method and system are combined with a ground-based laser radar and a satellite-borne laser radar to improve the aerosol profile concentration inversion precision. The inversion process comprises the following steps: based on indirect adjustment, using equations measured by a ground laser radar and a satellite-borne laser radar to calculate a profile of an aerosol extinction backscattering ratio in a period; according to a layered AOD product of the satellite-borne laser radar, determining the height of an initial boundary point and aerosol characteristics of the height, and determining an initial calculation value of a backward integral; and according to the determined aerosol extinction backscattering ratio and the signal of the ground-based laser radar, using an aerosol extinction coefficient formula deduced by using a Fernald method to calculate an aerosol extinction coefficient at a certain height, and further obtaining the aerosol optical thickness. According to the invention, when pollution is serious and weather conditions are poor, accurate data can be obtained, and not only is good precision achieved, but also high stability is achieved.

Description

technical field [0001] The invention relates to the field of atmospheric remote sensing, in particular to a ground-based laser radar aerosol retrieval method and system based on laser radar satellites, which effectively utilizes laser radar satellites to improve the accuracy of the laser radar-based aerosol profile concentration retrieval. Background technique [0002] The impact of aerosols on the global atmospheric environment is mainly manifested in three aspects: First, aerosols have the characteristics of absorbing and scattering incident light from the sun, which can affect global and regional climate change by changing the solar radiation balance. At the same time, aerosols can also cause environmental problems, causing regional haze and dust pollution, and adversely affecting human health. Finally, aerosols can act as condensation nuclei for clouds, affecting the water cycle in the atmospheric environment. The "London smog" and "Los Angeles smog" in history are very...

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Problems solved by technology

However, there are two disadvantages in the Fernald method: first, the extinction backscattering ratio of the aerosol needs to be selected based on empirical values, and the aerosol is one of the most active molecules in the atmosphere, and the extinction backscattering ratio of the aerosol is It is constantly changing with the physical and chemical content of the atmosphere, which introduces a large error to the inversion of the aerosol extinction coefficient; second, the calibration altitude is determined by seeking a clean atmosphere, but it basically does not exist in the actual troposphere The altitude at which the aerosol content is 0, on the other hand, due to factors such as air pollution, it is difficult to conduct lidar observations covering a large area from low altitude to high altitude, which brings inevitable errors to aerosol inversion

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