Fine-modal aerosol parameter inversion method

A parameter inversion and aerosol technology, which is applied in the field of air pollution control, can solve the problems of missing products, low spatial resolution, and low precision, and achieve high spatial coverage, high spatial resolution, and high precision.

Active Publication Date: 2020-01-17
INST OF REMOTE SENSING & DIGITAL EARTH CHINESE ACADEMY OF SCI
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Problems solved by technology

Since BPDF is a statistical model, it cannot estimate the polarized surface reflectance very well on some specific surfaces, which leads to problems such as low spatial resolution, missing products on specific surfaces, and low precision in the currently retrieved fine-mode aerosols. , so it is urgent to develop a new technical solution to retrieve the fine-mode aerosol

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Embodiment 1

[0067] figure 1 (a) is the true color image of the POLDER satellite image of Eastern China on November 15, 2011, (b) is the result of the fine-modal aerosol optical thickness of the method of the present invention, and (c) is the official fine-modal aerosol optical thickness result. The surface types in this area are mainly vegetation, cultivated land, and cities. It can be seen from the figure that the resolution of the official inversion is about 18km per pixel; the optical thickness of the fine-mode aerosol inverted by the method of the present invention is generally the same as that of the official inversion. The results are consistent in spatial distribution, but the method of the present invention has a higher spatial coverage, especially in densely populated and economically developed coastal areas, to make up for the lack of a large number of products in the official algorithm in this area. In addition, the fine modal aerosol optical thickness of the present invention h...

Embodiment 2

[0069] figure 2 (a) is the true color image of the POLDER satellite image of Northwest China and India on November 18, 2011, (b) is the fine-modal aerosol optical thickness result of the method of the present invention, (c) is the official fine-modal aerosol optical thickness result. The surface types in this area include deserts, mountains, and cultivated land. It can be clearly seen from the figure that the resolution of the official inversion is about 18km per pixel; the fine-mode aerosol optical thickness inverted by the present invention is in the desert. The spatial coverage of mountainous and coastal areas is significantly higher than that of the official algorithm, which makes up for the lack of a large number of products in this surface area of ​​the official algorithm, especially in the Qinghai-Tibet Plateau where the terrain is complex and aerosol retrieval is difficult. In addition, the fine-modal aerosol optical thickness product of the algorithm of the present in...

Embodiment 3

[0071] In order to quantitatively evaluate the precision of the fine-mode aerosol optical thickness retrieved by the present invention, the results of the foundation AERONET stations located on different ground types are selected for verification. image 3 Based on the three-year POLDER data from 2010 to 2012, the fine-mode aerosol optical thickness inverted by the method of the present invention and the official algorithm is verified with the ground station point. From the results, it can be seen that whether it is the number of inversions N, The correlation R, the root mean square error RMSE are still the ratio Gfrac that falls within the error range, and the fine-mode aerosol optical thickness retrieved by the present invention is better than the official algorithm result, indicating that the present algorithm is significantly better than the official algorithm. Figure 4 Based on the POLDER data from 2010 to 2012, the method and official algorithm of the present invention and ...

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Abstract

The invention discloses a fine-modal aerosol parameter inversion method. The characteristic that polarization surface reflectance basically does not change along with wave bands from visible light tonear-infrared wave bands is utilized. The characteristic of small change of polarization surface reflectance is combined. Polarization remote sensing data of the POLDER sensor is inversed to obtain the optical thickness of the fine-modal aerosol. According to the invention, fine-modal aerosol parameters and polarization surface reflectance can be effectively and simultaneously inverted, and the inverted fine-modal aerosol optical thickness has higher spatial coverage, higher spatial resolution and higher precision. The method can be used for researching small-scale fine-modal aerosol, and thecoverage degree and the precision of bright earth surfaces (cities, deserts and the like) are improved.

Description

Technical field [0001] The invention relates to the field of air pollution control, in particular to an atmospheric aerosol observation technology. Background technique [0002] The particle size of atmospheric aerosols generally ranges from a few nanometers to tens of microns. In order to better evaluate their impact on the global radiation balance, climate change, atmospheric environment and human health, aerosols are usually divided into fine modes and coarse modes according to their particle size. Modal aerosol. The radius of fine-mode aerosols is generally 0.1-0.2 microns, and the main source is man-made emissions. The radius of coarse-mode aerosols is generally greater than 1 micron, mainly from natural emissions. According to the fifth assessment report of the Intergovernmental Panel on Climate Change (IPCC), fine-mode aerosols have a greater impact on climate change due to their large absorption characteristics. In addition, the fine-mode aerosol is the estimated groun...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F30/20G01N15/06
CPCG01N15/06G01N2015/0693
Inventor 李正强葛邦宇侯伟真谢一凇许华张莹
Owner INST OF REMOTE SENSING & DIGITAL EARTH CHINESE ACADEMY OF SCI
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