Huifang Zhang, Wei Wang, Cheng Liu, Changgong Shan, Qihou Hu, Youwen Sun, Jones Nicholas. Detection of Temporal and Spatial Distributions of Atmospheric Nitric Acid Based on Ground-Based High-Resolution Solar Absorption Spectra[J]. Acta Optica Sinica, 2020, 40(2): 0201003
- Acta Optica Sinica
- Vol. 40, Issue 2, 0201003 (2020)
Fig. 1. Observation instruments. (a) Bruker 125HR FTS; (b) solar-tracker
Fig. 2. Process of spectral retrieval
Fig. 3. Linear alignment results of instrument. (a) MEAs retrieved from HBr cell measurements; (b) PEs retrieved from HBr cell measurements
Fig. 4. Spectral fitting result and residual of HNO3 in absorption window centered in wavenumber of 869 cm-1
Fig. 5. Spectral fitting result and residual of HNO3 in absorption window centered in wavenumber of 873 cm-1
Fig. 6. Examples of a priori profile and retrieved profile of HNO3. (a) Retrieved profile and a priori profile; (b) Retrieved profile and a priori profile after taking logarithm
Fig. 7. Vertical profiles of HNO3 volume concentration in different seasons
Fig. 8. Average kernels of retrieved HNO3 profiles
Fig. 9. Total-column average kernel of retrieved HNO3 profiles under typical measurement condition
Fig. 10. Time series of HNO3 total column in 2017
Fig. 11. Comparison between total column of HNO3 observed by ground-based FTS and corresponding partial column of HNO3 observed by MLS satellite
Fig. 12. Scattering plot of total column of HNO3 observed by ground-based FTS and partial column of HNO3 observed by MLS satellite
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Table 1. Retrieval windows for HNO3 spectra
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Table 2. Mean random and systematic errors for HNO3 retrieval
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