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Method for inverting urban atmospheric aerosol optical depth on basis of MODIS data

A technology of optical thickness and urban atmosphere, applied in the field of atmospheric remote sensing, can solve the problems of only being divided into dusty and urban roughness, and achieve the effect of easy implementation and high inversion accuracy

Inactive Publication Date: 2014-09-03
HANGZHOU DIANZI UNIV
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Problems solved by technology

Although this method is not affected by mixed pixels, it can be effectively used for aerosol monitoring in urban areas, but it selects the established aerosol types in the 6S atmospheric radiation transfer model, and divides the entire earth's atmospheric aerosols into only dust and dust. urban sex is obviously very rough

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  • Method for inverting urban atmospheric aerosol optical depth on basis of MODIS data
  • Method for inverting urban atmospheric aerosol optical depth on basis of MODIS data
  • Method for inverting urban atmospheric aerosol optical depth on basis of MODIS data

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Embodiment Construction

[0017] like figure 1 Shown, the present invention comprises the following steps:

[0018] 1) According to the 6S atmospheric radiation transfer equation, establish a mathematical model to calculate the volume ratio concentration of four basic aerosols of dust, water-soluble, oceanic and soot, and obtain custom aerosol types. Specifically, let the volume ratio concentration of dusty aerosol be v 1 , the volume ratio concentration of water-soluble aerosol is v 2 , the volume ratio concentration of oceanic aerosol is v 3 , the volume ratio concentration of soot aerosol is v 4 , where v 4 =1-(v 1 +v 2 +v 3 ); According to the characteristics of the city to be inverted, determine v 1 , v 2 , v 3 , v 4 The critical value of v 1 The minimum value of v 1min , v 1 The maximum value is v 1max , v 2 The minimum value of v 2min , v 2 The maximum value is v 2max , v 3 The minimum value of v 3min , v 3 The maximum value is v 3max ; The apparent reflectance of satellit...

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Abstract

The invention discloses a method for inverting the urban atmospheric aerosol optical depth on the basis of MODIS data. The method includes the steps (1), a mathematical model is established according to a 6S atmospheric radiation transmission equation, the volume ratio concentration of four basic aerosols including the dust aerosol, the water-soluble aerosol, the maritime aerosol and the soot aerosol is calculated, and customized aerosol types are obtained; (2), according to the relation among the surface reflectance of a 2.1-micrometer channel, the surface reflectance of a red channel and the surface reflectance of a blue channel in the MODIS data, an estimated value of the surface reflectance of the red channel and an estimated value of the surface reflectance of the blue channel are obtained; (3), an aerosol optical depth lookup table of the red channel and an aerosol optical depth lookup table of the blue channel are built respectively according to the 6S atmospheric radiation transmission equation and the aerosol types in the step (1); (4) spline interpolation is carried out on data in the lookup tables three times, the aerosol optical depth under the appointed surface reflectance is obtained, and inversion of the atmospheric aerosol optical depth is finished. The method for inverting the urban atmospheric aerosol optical depth is easy to implement, high in inversion accuracy and capable of being effectively used for urban aerosol monitoring.

Description

technical field [0001] The invention relates to the research on aerosol characteristics in the field of atmospheric remote sensing, in particular to a method for retrieving the optical thickness of urban atmospheric aerosols based on MODIS data. Background technique [0002] In recent years, due to human factors such as urban traffic pollution, municipal construction, industrial gas emissions in surrounding areas, and severe damage to the natural ecological environment, urban air quality has been greatly affected and air pollution is serious. In order to reduce the impact of pollution sources, the monitoring of urban atmospheric environmental quality has become particularly important, and aerosol particles have received extensive attention and research because of their important role in atmospheric monitoring. Atmospheric aerosol is composed of substances in different phases. Although the content is very small, it can affect solar radiation through absorption and scattering,...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B11/06G01S7/48
Inventor 范娇
Owner HANGZHOU DIANZI UNIV
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