Monitoring and Comparative Analysis of NO2 and HCHO in Shanghai Using Dual-Azimuth Scanning MAX-DOAS and TROPOMI DOI Creative Commons
Hongmei Ren, Ang Li, Zhaokun Hu

et al.

Remote Sensing, Journal Year: 2025, Volume and Issue: 17(3), P. 355 - 355

Published: Jan. 22, 2025

This study employed dual-azimuth scanning MAX-DOAS to monitor vertical column densities of NO2 and HCHO in Shanghai during the summer winter 2023, compared results with Sentinel-5P TROPOMI data. Dual-azimuth revealed a generally consistent trend gas concentrations (r > 0.95), but at 90° were higher than those 0°, especially near surface. suggests that averaging multiple azimuth angles is necessary better represent regional pollution levels. During observation period, diurnal patterns exhibited “double peak” morning evening, which was more pronounced summer, while peaked between 13:00 15:00. Comparisons data demonstrated overall good agreement. However, probability TROPOMI’s measurements being lower 80% 62.5%, respectively. Furthermore, tended overestimate high concentrations, overestimation reaching 41.14% for when exceeding 9.54 × 1015 molecules/cm2 25.93% 1.26 1016 molecules/cm2. Sensitivity analysis sampling distance (0–40 km) samples ground-based site, time (±5 ±60 min) relative overpass, using 15–25 km 10–20 HCHO, along appropriately shortening times extending them can effectively enhance consistency satellite observations. These findings not only reveal spatiotemporal distribution characteristics pollutants optimize parameters satellite–ground validation, providing support improving enhancing accuracy retrieval algorithms.

Language: Английский

Monitoring and Comparative Analysis of NO2 and HCHO in Shanghai Using Dual-Azimuth Scanning MAX-DOAS and TROPOMI DOI Creative Commons
Hongmei Ren, Ang Li, Zhaokun Hu

et al.

Remote Sensing, Journal Year: 2025, Volume and Issue: 17(3), P. 355 - 355

Published: Jan. 22, 2025

This study employed dual-azimuth scanning MAX-DOAS to monitor vertical column densities of NO2 and HCHO in Shanghai during the summer winter 2023, compared results with Sentinel-5P TROPOMI data. Dual-azimuth revealed a generally consistent trend gas concentrations (r > 0.95), but at 90° were higher than those 0°, especially near surface. suggests that averaging multiple azimuth angles is necessary better represent regional pollution levels. During observation period, diurnal patterns exhibited “double peak” morning evening, which was more pronounced summer, while peaked between 13:00 15:00. Comparisons data demonstrated overall good agreement. However, probability TROPOMI’s measurements being lower 80% 62.5%, respectively. Furthermore, tended overestimate high concentrations, overestimation reaching 41.14% for when exceeding 9.54 × 1015 molecules/cm2 25.93% 1.26 1016 molecules/cm2. Sensitivity analysis sampling distance (0–40 km) samples ground-based site, time (±5 ±60 min) relative overpass, using 15–25 km 10–20 HCHO, along appropriately shortening times extending them can effectively enhance consistency satellite observations. These findings not only reveal spatiotemporal distribution characteristics pollutants optimize parameters satellite–ground validation, providing support improving enhancing accuracy retrieval algorithms.

Language: Английский

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