NO2 validation during the NASA Asia-Air Quality Flight Campaign with an experimental portable DOAS (PDOAS) at Kaohsiung

Feng Zhang; Changyong Cao; Tung-Chang Liu; Xi Shao; Jan-Lukas Tirpitz; Shobha Kondragunta; Yucheng Chang

doi:10.1117/12.3040761

3 January 2025 NO₂ validation during the NASA Asia-Air Quality flight campaign with an experimental portable DOAS (PDOAS) at Kaohsiung

Feng Zhang, Changyong Cao, Tung-Chang Liu, Xi Shao, Jan-Lukas Tirpitz, Shobha Kondragunta, Yucheng Chang

Author Affiliations +

Proceedings Volume 13262, Remote Sensing of the Atmosphere, Clouds, and Precipitation VIII; 132620Q (2025) https://doi.org/10.1117/12.3040761
Event: Asia-Pacific Remote Sensing, 2024, Kaohsiung, Taiwan

Conference Poster

Abstract

This study focuses on retrieving and validating Nitrogen dioxide (NO₂) trace gas vertical column densities (VCDs) using an experimental Portable Differential Optical Absorption Spectroscopy (PDOAS) instrument deployed at Kaohsiung during the National Aeronautics and Space Administration (NASA) Airborne and Satellite Investigation of Asian Air Quality (ASIA-AQ) field campaign in the spring of 2024. The PDOAS spectral measurements at multiple viewing elevation angles between 1 and 90 deg were processed with the widely recognized QDOAS software package to obtain Differential Slant Column Densities (DSCD) for NO₂ and O₄. Subsequently, the QDOAS results were further analyzed using the Retrieval of Atmospheric Parameters from Spectroscopic Observations using DOAS Instruments (RAPSODI) software to determine the vertical column densities (VCDs) of NO₂. As an initial evaluation of the NO2 VCD retrievals from PDOAS measurements, the PDOAS retrievals are compared with data from the Geostationary Environment Monitoring Spectrometer (GEMS). After excluding measurements contaminated by clouds, 10 effective measurements collected over four days were compared. A high correlation coefficient of 78.93% was found between our PDOAS-retrieved NO₂ VCDs and those from GEMS. This correlation coefficient is comparable to correlations between long-term daily mean NO₂ retrievals from GEMS and in-situ station observations in Kaohsiung. The compact and portable design of PDOAS allows for flexible and mobile air quality measurements. Additionally, the instrument and methodologies developed for PDOAS can be extended beyond NO₂ analysis, making them suitable for examining aerosols and other trace gases as well.

(2025) Published by SPIE. Downloading of the abstract is permitted for personal use only.

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Feng Zhang, Changyong Cao, Tung-Chang Liu, Xi Shao, Jan-Lukas Tirpitz, Shobha Kondragunta, and Yucheng Chang "NO₂ validation during the NASA Asia-Air Quality flight campaign with an experimental portable DOAS (PDOAS) at Kaohsiung", Proc. SPIE 13262, Remote Sensing of the Atmosphere, Clouds, and Precipitation VIII, 132620Q (3 January 2025); https://doi.org/10.1117/12.3040761

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