大气CO2反演误差分析与精度验证 
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Atmospheric CO2 Inversion Error Analysis and Accuracy Verification
1 中国科学院安徽光学精密机械研究所通用光学定标与表征技术重点实验室, 安徽 合肥 230031
2 中国科学技术大学, 安徽 合肥 230026
图 & 表
图 1. 不同反射率条件下气溶胶散射对XCO2反演的影响。(a)乡村型; (b)城市型
Fig. 1. Effect of aerosol scattering on XCO2 inversion under different reflectance conditions. (a) Rural; (b) urban
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图 2. 大气温度廓线造成的XCO2反演误差
Fig. 2. XCO2 inversion error caused by atmospheric temperature profile
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图 3. 地表气压造成的XCO2反演误差
Fig. 3. XCO2 inversion error caused by surface atmospheric pressure
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图 4. 地表反射率造成的XCO2反演误差
Fig. 4. XCO2 inversion error caused by surface reflectance
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图 5. GMI采样图
Fig. 5. GMI sample map
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表 1GMI主要的技术参数
Table1. Main technical parameters of GMI
| Band | Band-1 | Band-2 | Band-3 | Band-4 |
|---|
| Spectral range /cm-1 | 13004--13175 | 6317.1--6377.6 | 6031.4--6090.1 | 4859.1--3894.8 | | Sampling interval /cm-1 | 0.020 | 0.003 | 0.007 | 0.004 | | Spectral resolution /cm-1 | 0.60 | | 0.27 | | | Signal to noise ratio | 300 | 300 | 250 | 250 |
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表 2用于模拟研究的因素变化范围
Table2. Variation range of factors used for simulation study
| Parameter | Range of variation |
|---|
| Solar zenith angle /(°) | 30 | | Observation zenith angle /(°) | 0 | | Aerosol model | Rural, urban | | AOD(0.55 μm) | 0.01,0.05,0.10,0.15,0.20,0.25,0.30 | | Surface reflectance | 0.05,0.10,0.20,0.30,0.60 |
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表 3各参数及其扰动量
Table3. Parameters and perturbation quantity
| Parameter | Perturbation quantity |
|---|
| Surface atmospheric pressure /% | -1 | -1.5 | -2 | -2.5 | -3 | -3.5 | | Atmospheric temperature profile /K | ±0.5 | ±1 | ±1.5 | ±2 | ±2.5 | ±3 | | Surface reflectance | -0.25 | -0.20 | -0.10 | 0 | 0.10 | 0.20 | 0.30 | 0.35 |
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表 4九月份的TCCON各个站点的数据更新及运行情况
Table4. Data update and operation of TCCON sites in September
| Site | Operational? | Description |
|---|
| Ascension_Island | No | Solar tracker has arrived in Germany for repairs | | Caltech | Yes | | | Edwards | Yes | | | East Trout Lake | Yes | Sunlight blockage resolved | | Eureka | Yes | Instrument aligned | | Garmisch | Yes | operational | | Izana | Yes | Normal mixed NIR-MIR operation | | Karlsruhe | Yes | Instrument is operational, overpass operation possible during working days | | Lamont | Yes | | | Lauder | Yes | 125 HR operational | | Saga | Yes | Vacuum pump was repaired on January 5,2016 | | Sodankyla | Yes | | | Zugspitze | Yes | Operational | | Park_Falls | Yes | |
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表 5GMI数据与TCCON各站点的数据差异
Table5. Difference of GMI data and TCCON data at each site
| Site | Latitude /(°) | Number of data | Difference | Proportion of difference | |
|---|
| Average /10-6 | | σ /10-6 | Average /% | σ /% |
|---|
| Saga | 33.24 | 2 | -0.0704 | 1.6278 | -0.02 | 0.40 | | Caltech | 34.14 | 18 | -2.5361 | 2.5200 | -0.62 | 0.62 | | Edwards | 34.96 | 24 | -0.3447 | 2.4047 | -0.09 | 0.59 | | Beijing | 40.05 | 9 | 0.5545 | 2.8977 | 0.14 | 0.72 | | Park Falls | 45.94 | 6 | 1.6167 | 2.6287 | 0.28 | 0.65 | | Karlsruhe | 49.1 | 5 | -1.0817 | 2.8937 | -0.27 | 0.71 | | Sodankyla | 67.37 | 6 | -3.3496 | 3.1588 | 0.83 | 0.79 | | Lauder | -45.04 | 8 | -2.2634 | 3.1802 | -0.56 | 0.79 | | Total | | 78 | -1.0639 | 2.9331 | -0.26 | 0.72 | | Note: Different is the result of XCO2 by GMI SWIR minus XCO2 by g-b FTS; proportion of difference is obtained by dividing the aforementioned difference by XCO2 by g-b FTS. |
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李勤勤, 王先华, 叶函函, 吴时超, 李超, 王晓迪. 大气CO2反演误差分析与精度验证[J]. 光学学报, 2020, 40(6): 0601003. Qinqin Li, Xianhua Wang, Hanhan Ye, Shichao Wu, Chao Li, Xiaodi Wang. Atmospheric CO2 Inversion Error Analysis and Accuracy Verification[J]. Acta Optica Sinica, 2020, 40(6): 0601003.
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