Retrieval of NO2 Column Amounts from Ground-Based Hyperspectral Imaging Sensor Measurements

Total column amounts of NO2 (TCN) were estimated from ground-based hyperspectral imaging sensor (HIS) measurements in a polluted urban area (Seoul, Korea) by applying the radiance ratio fitting method with five wavelength pairs from 400 to 460 nm. We quantified the uncertainty of the retrieved TCN b...

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Bibliographic Details
Published in:Remote sensing (Basel, Switzerland) Switzerland), 2019-12, Vol.11 (24), p.3005
Main Authors: Park, Hyeon-Ju, Park, Jin-Soo, Kim, Sang-Woo, Chong, Heesung, Lee, Hana, Kim, Hyunjae, Ahn, Joon-Young, Kim, Dai-Gon, Kim, Jhoon, Park, Sang Seo
Format: Article
Language:English
Subjects:
Aerosols
Air pollution
Algorithms
Bias
Datasets
Hyperspectral imaging
Nitrogen dioxide
Optical analysis
Optical thickness
Radiation
Sensitivity analysis
Sensors
Spectrum analysis
Stratosphere
Temporal variations
Uncertainty
Urban areas
Zenith
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Summary:Total column amounts of NO2 (TCN) were estimated from ground-based hyperspectral imaging sensor (HIS) measurements in a polluted urban area (Seoul, Korea) by applying the radiance ratio fitting method with five wavelength pairs from 400 to 460 nm. We quantified the uncertainty of the retrieved TCN based on several factors. The estimated TCN uncertainty was up to 0.09 Dobson unit (DU), equivalent to 2.687 × 1020 molecules m−2) given a 1° error for the observation geometries, including the solar zenith angle, viewing zenith angle, and relative azimuth angle. About 0.1 DU (6.8%) was estimated for an aerosol optical depth (AOD) uncertainty of 0.01. In addition, the uncertainty due to the NO2 vertical profile was 14% to 22%. Compared with the co-located Pandora spectrophotometer measurements, the HIS captured the temporal variation of the TCN during the intensive observation period. The correlation between the TCN from the HIS and Pandora also showed good agreement, with a slight positive bias (bias: 0.6 DU, root mean square error: 0.7 DU).
ISSN:2072-4292
2072-4292
DOI:10.3390/rs11243005