Heng XU, Hao-ran LIU, Xiang-guang JI, Qi-hua LI, Guo-hua LIU, Jin-ping OU, Peng-cheng ZHU. Study on the Tropospheric Column Density of NO2 in Shanghai Based on MAX-DOAS[J]. Spectroscopy and Spectral Analysis, 2022, 42(9): 2720
- Spectroscopy and Spectral Analysis
- Vol. 42, Issue 9, 2720 (2022)
Fig. 1. MAX-DOAS measurement site
Fig. 2. A fitting spectrum of a typical measured spectrum
Fig. 3. Correlation of tropospheric NO2 VCDs observed between MAX-DOAS and TROPOMI
Fig. 4. Daily variations of tropospheric NO2VCDs
Fig. 5. Diurnal variation characteristics of tropospheric NO2 VCDs during weekdays and weekends
Fig. 6. Time series of the daily average values of NO2 VCDs observed by MAX-DOAS from June 21 to September 30, 2019
The shaded area is there periods
The shaded area is there periods
Fig. 7. Mean 24 h air mass backward trajectories and each trajectory cluster arriving at Shanghai at 500 m altitudes and the percentage of allocation to each cluster during the three typical periods
(a): Jun. 28—Jul. 15; (b): Jul. 28—Aug. 20; (c): Aug. 26—Sep. 15
(a): Jun. 28—Jul. 15; (b): Jul. 28—Aug. 20; (c): Aug. 26—Sep. 15
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Table 1. The DOAS fitting settings for NO2 DSCD retrieval
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