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Inversion method and system for aerosol optical depth

A technology of optical thickness and aerosol, applied in the field of atmospheric remote sensing, can solve the problems of inability to construct surface reflectance, inability to realize satellite remote sensing inversion of aerosol optical depth, lack of near-infrared band channels, etc.

Active Publication Date: 2019-08-13
INST OF REMOTE SENSING & DIGITAL EARTH CHINESE ACADEMY OF SCI
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Problems solved by technology

However, due to the lack of near-infrared band channels in the WFV data of the GF-1 satellite, it is impossible to construct the surface reflectance, so that the satellite remote sensing inversion of aerosol optical depth cannot be realized.

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  • Inversion method and system for aerosol optical depth
  • Inversion method and system for aerosol optical depth
  • Inversion method and system for aerosol optical depth

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[0028] In the following description, for illustrative purposes, many specific details are set forth in order to provide a comprehensive understanding of one or more embodiments. However, it is obvious that these embodiments can also be implemented without these specific details. In other examples, for the convenience of describing one or more embodiments, well-known structures and devices are shown in the form of block diagrams.

[0029] The invention uses GEOS-Chem atmospheric chemistry model data to construct a grid-scale aerosol model. The GEOS-Chem atmospheric chemistry model data is driven by the Goddard Earth Observing System (GEOS) assimilation meteorological data of NASA's Global Model Assimilation Office. The volume ratio, concentration, optical characteristics, profile and other information of dust, sulfate, nitrate, ammonium salt, black carbon, organic carbon, marine type and other particulate matter provided by GEOS-Chem atmospheric chemistry model data can effective...

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Abstract

The invention provides an inversion method and system of aerosol optical depth. The method includes: establishing an aerosol inversion lookup table and acquiring surface reflectance; on the basis of the WFV data of the GF-1 satellite, substituting the acquired surface reflectance, and looking up and interpolating the atmospheric parameters of the established aerosol inversion lookup table to obtain aerosol optical depth. The aerosol inversion lookup table is established by steps: calculating the volume ratios of four types of aerosol components on the basis of the data of a GEOS (Goddard earth observing system)-Chem atmospheric chemistry model, wherein the four types of aerosol include dust type aerosol, water-soluble aerosol, smoke type aerosol and sea salt type aerosol; taking the obtained calculation results as input parameters to establish the aerosol inversion lookup table by the aid of a 6SV1 radiation transfer equation. The surface reflectance is calculated on the basis of the surface bidirectional reflectance products of a foreign satellite MODIS. By inversion method, large-range aerosol monitoring can be realized quickly and accurately to provide a prerequisite for the remote sensing estimation of particulate matter concentration.

Description

Technical field [0001] The present invention relates to the technical field of atmospheric remote sensing, and more specifically, to a method and system for inversion of aerosol optical thickness. Background technique [0002] Aerosol refers to a multiphase system composed of solid or liquid particles suspended in a gas and a gas carrier. Aerosols originate from nature and human activities. Natural sources include volcanic ash, marine debris, and windy sand. To a greater extent, aerosols are particulate matter that enters the atmosphere from incomplete combustion such as industrial production, automobile exhaust, coal-fired heating, and straw burning. Although the content of aerosols only accounts for a small part of the earth’s atmospheric components, due to their wide distribution in the atmosphere, huge spatial changes, short life spans, and complex chemical composition, they have a significant impact on weather processes, global climate and human health. Have an important i...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N15/06
Inventor 李莘莘陈良富范萌司一丹余超苏林陶金花李小英王子峰
Owner INST OF REMOTE SENSING & DIGITAL EARTH CHINESE ACADEMY OF SCI
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