Atmospheric Carbon Dioxide Inversion and Surface Reflectance Analysis Based on Ratio Method

Xinqiang Wang; Qiuyu Liang; Song Ye; Fangyuan Wang; Shu Li; Shan Yin; Yongying Gan

doi:10.3788/LOP202259.0101001

Laser & Optoelectronics Progress, Volume. 59, Issue 1, 0101001(2022)

Atmospheric Carbon Dioxide Inversion and Surface Reflectance Analysis Based on Ratio Method

Xinqiang Wang^1,2, Qiuyu Liang^1,2, Song Ye^1,2, Fangyuan Wang^1,2, Shu Li^1,2, Shan Yin^1,2, and Yongying Gan^1,2、*

¹School of Electronic Engineering and Automation, Guilin University of Electronic Technology, Guilin , Guangxi 541004, China

²Guangxi Key Laboratory of Optoelectronic Information Processing, Guilin , Guangxi 541004, China

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Figures & Tables(12)

Fig. 1. Transmittance spectra of each gas. (a) Transmittance spectra of CO₂, N₂O, O₃, and H₂O; (b) local magnification

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Fig. 2. Simulated radiance spectrum at the absorption zone of 1.58-μm CO₂

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Fig. 3. Radiance spectra at the absorption zone of 1.58-μm CO₂ under different aerosols

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Fig. 4. Radiance spectra at the absorption zone of 1.58-μm CO₂ corresponding to surface reflectance 0.1-0.9 respectively

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Fig. 5. Diagram of ratio method

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Fig. 6. Fitting results between spectral radiance ratios and carbon dioxide concentration near 6310 cm^-1 absorption peaks at different surface reflectivity. (a) 0.05; (b) 0.16; (c) 0.3; (d) 0.5; (e) 0.8

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Fig. 7. Measured transmittance spectra of different CO₂ concentrations

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Fig. 8. Linear fitting result between transmittance spectral ratio of measured data and carbon dioxide concentration

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Table 1. Difference ratio of different reflectivity
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Table 1. Difference ratio of different reflectivity
Reflectivity Differential ratio /%
0.1 -8.03
0.2 -6.15
0.3 -4.19
0.4 -2.15
0.5 0
0.6 2.25
0.7 4.61
0.8 7.09
0.9 9.71

Table 2. Average fitting results of surface reflectivity with different wavenumbers

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Table 2. Average fitting results of surface reflectivity with different wavenumbers

Wavenumber /cm^-1	Model	R	Average error /%
6310	Y=-5693.47397×X+5628.92276	-0.996	1.15
6323	Y=-3212.74973×X+2838.50017	-0.983	1.47
6334	Y=-2692.12499×X+2131.76557	-0.985	1.81
6354	Y=-2211.6141×X+1773.44557	-0.940	1.64

Table 3. Mean fitting results of different atmospheric models and aerosols

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Table 3. Mean fitting results of different atmospheric models and aerosols

Atmospheric model	Model	R	Average error /%
Midlatitude summer	Y=-5753.547×X+5747.306	-0.992	1.43
1976 US standard	Y=-5558.7×X+5533.371	-0.994	1.22
Rural，visibility is 5 km	Y=-5693.474×X+5628.923	-0.996	1.15
Navy maritime	Y=-5703.95×X+5638.444	-0.979	1.21
Urban，visibility is 5 km	Y=-5749.289×X+5686.76	-0.990	1.32

Table 4. Technical index of space heterodyne spectrometer
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Table 4. Technical index of space heterodyne spectrometer
Parameter Value
Spectral resolution /cm^-1 0.27
Spectral range /cm^-1 6 325-6 360
Signal to noise ratio 300
Detection of pixels 320×25，630 μm×30 μm

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Xinqiang Wang, Qiuyu Liang, Song Ye, Fangyuan Wang, Shu Li, Shan Yin, Yongying Gan. Atmospheric Carbon Dioxide Inversion and Surface Reflectance Analysis Based on Ratio Method[J]. Laser & Optoelectronics Progress, 2022, 59(1): 0101001

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