Assessment of the quality of TROPOMI high-spatial-resolution NO 2 data products in the Greater Toronto Area

作者：Xiaoyi Zhao, Debora Griffin, Vitali Fioletov, Chris Anthony McLinden, Alexander M. Cede, Martin Tiefengraber, Moritz Müller, Kristof Bognar, Kimberly Strong, K. F. Boersma, Henk J. Eskes, J. Davies, Akira Ogyu, Sum Chi Lee · 发表于：Atmospheric measurement techniques · 年份：2020 · DOI：10.5194/amt-13-2131-2020 · 被引用次数：133 · 研究领域：Atmospheric Ozone and Climate、Atmospheric and Environmental Gas Dynamics、Atmospheric chemistry and aerosols

The TROPOspheric Monitoring Instrument (TROPOMI) aboard the Sentinel-5 Precursor satellite (launched on 13 October 2017) is a nadir-viewing spectrometer measuring reflected sunlight in the ultraviolet, visible, near-infrared, and shortwave infrared spectral ranges. The measured spectra are used to retrieve total columns of trace gases, including nitrogen dioxide (NO 2 ). For ground validation of these satellite measurements, Pandora spectrometers, which retrieve high-quality NO 2 total columns via direct-sun measurements, are widely used. In this study, Pandora NO 2 measurements made at three sites located in or north of the Greater Toronto Area (GTA) are used to evaluate the TROPOMI NO 2 data products, including a standard Royal Netherlands Meteorological Institute (KNMI) tropospheric and stratospheric NO 2 data product and a TROPOMI research data product developed by Environment and Climate Change Canada (ECCC) using a high-resolution regional air quality forecast model (in the air mass factor calculation). It is found that these current TROPOMI tropospheric NO 2 data products (standard and ECCC) met the TROPOMI design bias requirement (< 10 %). Using the statistical uncertainty estimation method, the estimated TROPOMI upper-limit precision falls below the design requirement at a rural site but above in the other two urban and suburban sites. The Pandora instruments are found to have sufficient precision (< 0.02 DU) to perform TROPOMI validation work. In addition to the tra...