Author Affiliations
1Key Laboratory of Optical Calibration and Characterization, Anhui Institute of Optics and Fine Mechanics, HFIPS,Chinese Academy of Sciences, Hefei 230031, China2University of Science and Technology of China, Hefei 230026, Chinashow less
Fig. 1. Retrieval results of OCO-2 data in forest. (a) January 2019; (b) July 2019
Fig. 2. Retrieval results of GMI data in forest. (a) January 2019; (b) July 2019
Fig. 3. Results of OCO-2 secondary fluorescence products in forest. (a) January 2019; (b) July 2019
Fig. 4. Retrieval results of OCO-2 data in desert. (a) January 2019; (b) July 2019
Fig. 5. Retrieval results of GMI data in desert. (a) January 2019; (b) July 2019
Fig. 6. Results of OCO-2 secondary fluorescence products in desert. (a) January 2019; (b) July 2019
Fig. 7. Retrieval results of OCO-2 data in grassland. (a) January 2019; (b) July 2019
Fig. 8. Retrieval results of GMI data in grassland. (a) January 2019; (b) July 2019
Fig. 9. Results of OCO-2 secondary fluorescence products in grassland. (a) January 2019; (b) July 2019
| Band | Central wavelength/nm | Spectral range/nm | Spectral resolution/cm-1 | SNR |
|---|
| Band1 | 765 | 759-769 | 0.60 | 300 | | Band2 | 1575 | 1568-1583 | 0.27 | 300 | | Band3 | 1650 | 1642-1658 | 0.27 | 250 | | Band4 | 2050 | 2043-2058 | 0.27 | 250 |
|
Table 1. Main parameters of GMI
| Band | Central wavelength/nm | Spectral range/nm | Spectral resolution/cm-1 | SNR |
|---|
| Band1 | 766 | 757-775 | 0.70 | 250 | | Band2 | 1786 | 591-1621 | 0.30 | 300 | | Band3 | 2061 | 2042-2081 | 0.25 | 120 |
|
Table 2. Main parameters of OCO-2
| Time | January 2019 | July 2019 |
|---|
| GMI retrieval average value | 0.8103 | 0.6126 | | GMI retrieval standard deviation | 0.6780 | 0.6452 | | OCO-2 retrieval average value | 0.8029 | 0.5980 | | OCO-2 retrieval standard deviation | 0.7445 | 0.6314 | | OCO-2 product average value | 0.7632 | 0.5426 | | OCO-2 product standard deviation | 0.6842 | 0.56311 |
|
Table 3. Retrieval results of the entire forest area in January and July 2019 (unit: w·m-2·sr-1·nm-1)
| Location | 1 | 2 | 3 |
|---|
| GMI retrieval average value | 0.9155 | 1.0096 | 0.7060 | | GMI retrieval standard deviation | 0.6550 | 0.8009 | 0.6119 | | OCO-2 retrieval average value | 0.8976 | 1.0052 | 0.7216 | | OCO-2 retrieval standard deviation | 0.6412 | 0.7806 | 0.5386 | | OCO-2 product average value | 0.8802 | 0.9496 | 0.6869 | | OCO-2 product standard deviation | 0.5846 | 0.6927 | 0.4802 |
|
Table 4. Comparison of different results of three locations in forest area in January 2019 (unit: w·m-2·sr-1·nm-1)
| Location | 1 | 2 | 3 |
|---|
| GMI retrieval average value | 0.6405 | 0.6047 | 0.7161 | | GMI retrieval standard deviation | 0.5879 | 0.6250 | 0.5965 | | OCO-2 retrieval average value | 0.6339 | 0.5419 | 0.6409 | | OCO-2 retrieval standard deviation | 0.5860 | 0.6185 | 0.5887 | | OCO-2 product average value | 0.5950 | 0.5292 | 0.6028 | | OCO-2 product standard deviation | 0.5285 | 0.5466 | 0.5227 |
|
Table 5. Comparison of different results of three locations in forest area in July 2019 (unit: w·m-2·sr-1·nm-1)
| Time | January 2019 | July 2019 |
|---|
| GMI retrieval average value | 0.2174 | 0.1610 | | GMI retrieval standard deviation | 0.4589 | 0.5228 | | OCO-2 retrieval average value | 0.1027 | 0.0583 | | OCO-2 retrieval standard deviation | 0.4415 | 0.5251 | | OCO-2 product average value | 0.0149 | -0.0236 | | OCO-2 product standard deviation | 0.3839 | 0.4492 |
|
Table 6. Retrieval results of the entire desert area in January and July 2019 (unit: w·m-2·sr-1·nm-1)
| Location | 1 | 2 | 3 |
|---|
| GMI retrieval average value | 0.0836 | 0.0973 | 0.1485 | | GMI retrieval standard deviation | 0.4183 | 0.4651 | 0.4309 | | OCO-2 retrieval average value | 0.0386 | 0.0721 | 0.0798 | | OCO-2 retrieval standard deviation | 0.4064 | 0.4347 | 0.4255 | | OCO-2 product average value | 0.0077 | -0.0244 | 0.0142 | | OCO-2 product standard deviation | 0.3515 | 0.3759 | 0.3724 |
|
Table 7. Comparison of different results of three locations in desert area in January 2019 (unit: w·m-2·sr-1·nm-1)
| Location | 1 | 2 | 3 |
|---|
| GMI retrieval average value | 0.0679 | 0.0961 | 0.1044 | | GMI retrieval standard deviation | 0.4682 | 0.5705 | 0.4692 | | OCO-2 retrieval average value | -0.0250 | 0.0057 | 0.0513 | | OCO-2 retrieval standard deviation | 0.4489 | 0.5207 | 0.5259 | | OCO-2 product average value | 0.0295 | -0.0862 | -0.0287 | | OCO-2 product standard deviation | 0.3934 | 0.4457 | 0.4430 |
|
Table 8. Comparison of different results of three locations in desert area in July 2019 (unit: w·m-2·sr-1·nm-1)
| Time | January 2019 | July 2019 |
|---|
| GMI retrieval average value | 0.2773 | 0.2585 | | GMI retrieval standard deviation | 0.4039 | 0.3658 | | OCO-2 retrieval average value | 0.2120 | 0.2216 | | OCO-2 retrieval standard deviation | 0.3900 | 0.3586 | | OCO-2 product average value | 0.1183 | 0.1391 | | OCO-2 product standard deviation | 0.3469 | 0.3166 |
|
Table 9. Retrieval results of the entire grassland area in January and July 2019 (unit: w·m-2·sr-1·nm-1)
| Location | 1 | 2 | 3 |
|---|
| GMI retrieval average value | 0.0673 | 0.1824 | 0.1968 | | GMI retrieval standard deviation | 0.3550 | 0.3399 | 0.3414 | | OCO-2 retrieval average value | 0.2273 | 0.1667 | 0.1869 | | OCO-2 retrieval standard deviation | 0.3468 | 0.2945 | 0.3401 | | OCO-2 product average value | 0.1519 | 0.1396 | 0.1305 | | OCO-2 product standard deviation | 0.3196 | 0.2658 | 0.3115 |
|
Table 10. Comparison of different results of three locations in grassland area in January 2019 (unit: w·m-2·sr-1·nm-1)
| Location | 1 | 2 | 3 |
|---|
| GMI retrieval average value | 0.3220 | 0.7521 | 0.5842 | | GMI retrieval standard deviation | 0.4897 | 0.4328 | 0.4944 | | OCO-2 retrieval average value | 0.4757 | 0.7383 | 0.5633 | | OCO-2 retrieval standard deviation | 0.4625 | 0.3817 | 0.4909 | | OCO-2 product average value | 0.4084 | 0.6962 | 0.4500 | | OCO-2 product standard deviation | 0.4326 | 0.3516 | 0.4372 |
|
Table 11. Comparison of different results of three locations in grassland area in July 2019 (unit: w·m-2·sr-1·nm-1)
