A space-time continuous PM2.5 inversion method based on foundation and satellite observation

Abstract

The invention discloses a space-time continuous PM2.5 inversion method based on foundation and satellite observation. The method comprises the following steps: dividing a monitoring area into a plurality of sub-areas; Establishing a random forest regression model for each sub-region, and carrying out inversion under the optimal model to obtain a PM2.5 concentration estimation value of each sub-region; Calculating a spatial interpolation observed by each station in each sub-region by using a common Kriging interpolation algorithm; Based on the root-mean-square error of the PM2.5 concentration satellite estimation value and the spatial interpolation, calculating the PM2.5 concentration satellite estimation value and the spatial interpolation by using an inverse variance weighting method to obtain a final PM2.5 concentration inversion value; According to the method, multi-scale segmentation and a random forest regression model are comprehensively adopted, the ground observation result isinterpolated, and seamless high-precision calculation of the near-ground PM2.5 concentration is achieved.

Description

technical field [0001] The present disclosure generally relates to the technical field of environmental monitoring, in particular to the monitoring technology of particulate matter in the air, and in particular to a space-time continuous PM2.5 retrieval method based on ground-based and satellite observations. Background technique [0002] In the past few decades, due to rapid urban expansion and industrialization, a large amount of particulate matter (PM, that is, particles with a diameter between 1 nanometer and 100 million) has been emitted into the air, resulting in frequent occurrence of haze events, especially in economically developed countries. and densely populated metropolitan areas. [0003] Atmospheric particulate matter is the most important component of aerosols and affects weather and climate systems through direct or indirect effects. Specifically, on the one hand, aerosols can directly absorb and scatter solar radiation and disturb the energy budget of the e...

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Problems solved by technology

In addition, the inversion of AOD is related to the albedo of the surface. When the albedo of the surface is high, the surface is highlighted. The inversion accuracy of AOD is low, and the missing rate of satellite AOD will be increased when the quality control and screening of data are carried out.

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