Atmospheric aerosol optical thickness estimation method and device based on measurement data of ground-based spectrometer

An atmospheric aerosol and optical thickness technology, applied in the field of quantitative remote sensing inversion, can solve the problems of complex calibration in factory, unable to meet the needs of fixed-point observation, and expensive.

Active Publication Date: 2020-05-22
PEKING UNIV
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Problems solved by technology

However, it should be noted that CE318 itself is expensive, and the factory calibration is complicated
Fixed-point observations cannot meet the demand for aerosol optical depth data from remote sensing observation data at different locations

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  • Atmospheric aerosol optical thickness estimation method and device based on measurement data of ground-based spectrometer
  • Atmospheric aerosol optical thickness estimation method and device based on measurement data of ground-based spectrometer
  • Atmospheric aerosol optical thickness estimation method and device based on measurement data of ground-based spectrometer

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Embodiment Construction

[0039] In order to make the above objects, features and advantages of the present invention more comprehensible, the present invention will be further described in detail below through specific embodiments and accompanying drawings.

[0040] figure 1 shows the general idea of ​​the invention. The specific implementation steps are as follows:

[0041] Step (1): Sky light ratio lookup table construction

[0042] Compared with other atmospheric molecules, aerosol optical depth is the atmospheric component that has the strongest effect on atmospheric scattering in the optical band. As the aerosol optical depth increases, the proportion of sky light also increases. At the same time, the proportion of sky light also changes with wavelength and solar zenith angle. Select Tropical (TRO, Tropical), Mid-latitude Summer (MLS, Middle Latitude Summer), Mid-latitude Winter (MLW, Middle Latitude Winter), Sub-Arctic Summer (SAS, Sub-Arctic Summer), Sub-Arctic Winter (SAW, Sub-Arctic Winter) ...

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Abstract

The invention discloses an atmospheric aerosol optical thickness estimation method and a device based on measurement data of a ground-based spectrometer. The method comprises the following steps: 1) establishing a spectral sky light proportion lookup table corresponding to a single wavelength between 400nm and 1000nm by taking an atmospheric profile type, a solar zenith angle and aerosol optical thickness as multi-dimensional indexes based on sky light proportions simulated by atmospheric radiation transmission software under different combination conditions; 2) measuring the sky light proportions by using a ground-based spectrometer and a standard reference board; and 3) extracting local lookup table data corresponding to the observation time from the lookup table established in the step1) based on the multi-dimensional indexes, and calculating the distance between the sky light proportion corresponding to different atmospheric aerosol optical thicknesses in the lookup table and theactually measured sky light proportion, and fitting by using a quadratic function to obtain a final aerosol optical thickness estimated value. The optical thickness of the atmospheric aerosol can be estimated by utilizing the spectral sky light proportion measured on the ground.

Description

technical field [0001] The invention belongs to the technical field of quantitative remote sensing inversion, and in particular relates to a method and a device for estimating the optical thickness of atmospheric aerosol by using the spectral sky light ratio measured on the ground. Background technique [0002] Atmospheric aerosol is an important part of the earth-atmosphere-ocean system, and the concentration of aerosol is an important parameter in the study of global climate change and regional environment. Aerosol particles in the atmosphere can absorb and scatter incident electromagnetic waves, thereby attenuating the beam. This attenuation is called extinction. The monitoring of aerosol is mainly to monitor the aerosol optical depth (Aerosol Optical Depth), which is defined as the integral of the aerosol extinction coefficient in the vertical direction along the electromagnetic wave transmission path. Aerosol optical depth represents an important physical quantity of a...

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 聂婧任华忠曾晖郭金鑫朱金顺郑逸童陈姗姗董家集
Owner PEKING UNIV
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