Bei-Bei ZHANG, Ning WANG, Wei-Yuan YAO, Yong-Gang QIAN, Ling-Ling MA, Chuan-Rong LI, Ling-Li TANG, Yao-Kai LIU, Cai-Xia GAO. Channel selection for carbon monoxide retrievals based on ultra-spectral thermal infrared data[J]. Journal of Infrared and Millimeter Waves, 2021, 40(3): 391
- Journal of Infrared and Millimeter Waves
- Vol. 40, Issue 3, 391 (2021)
Fig. 1. China's regional annual average distribution of CO columns from March 2000 to February 2009［20］
Fig. 2. Channel sensitivities to CO2， H2O， N2O， O3， CO， CH4， NO， NO2， and SO2 at the 4.67 μm band
Fig. 3. The distributions of the 300 channels in the spectrum of CO brightness temperature change selected by analyzing the STI ratio（STI>1） for the air masses of Beijing-Tianjin area in winter
Fig. 4. Jacobians of the initial channel group for the air masses of Beijing-Tianjin area in winter
Fig. 5. Jacobians of the channel at the top and bottom of characteristic peak of the CO brightness temperature change spectrum among the initial channel group for the air masses of Beijing-Tianjin area in winter
Fig. 6. Schematic diagram of channel selection from the initial channel group at the peak of the CO brightness temperature change spectrum（a）three channels（b）four channels
Fig. 7. The distribution in the CO brightness temperature change spectrum of the channels selected by the Peak sampling channel selection method for the air masses of four regions in（a）winter and（b）summer.
Fig. 8. The RMSEs of the retrieved CO profiles by the Peak sampling channel set, OSP channel set and all 4001-channel set for the winter air masses in（a）Beijing-Tianjin（b）Alxa（c）Yangtze River Delta（d）Pearl River Delta
Fig. 9. The RMSEs of the retrieved CO profiles by the Peak sampling channel set, OSP channel set and all 4001-channel set for the summer air masses in（a）Beijing-Tianjin（b）Alxa（c）Yangtze River Delta（d）Pearl River Delta
Fig. 10. The biases of the retrieved CO profiles by the Peak sampling channel set and OSP channel set for the winter air masses in（a）Beijing-Tianjin（b）Alxa（c）Yangtze River Delta（d）Pearl River Delta
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Table 1. The RMSEs of the retrieved CO profiles for the simulated ultra-spectral infrared data from the air masses of four regions in winter and summer with different channel sets
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