Comparison of Ground-Based Tropospheric NO2 Columns with OMI/Aura Products in the Greater Area of Thessaloniki by Means of an Air Quality Modeling Tool
Phaethon is a ground-based MAX-DOAS system, easily deployed at different locations to address specific air quality problems and support satellite validation studies. Three Phaethon systems have been deployed at different sites in the greater area of Thessaloniki, characterized by diverse local pollution levels representing urban, suburban and rural conditions, aiming at linking tropospheric trace-gas modeling with satellite products. Tropospheric NO2 columns derived at these sites located within an area of about 15 by 30 km, comparable to the size of OMI/Aura pixel, are compared with the satellite retrievals. The OMI/Aura products underestimate the NO2 in the city centre, representing the average pollution levels in the sub-satellite pixel area which, in the case of Thessaloniki, corresponds mostly to rural conditions. In order to minimize the collocation differences in spatial distribution between satellite and ground-based measurements, the former are adjusted by factors that are calculated by means of a high resolution air quality modeling tool, consisting of WRF meteorological model and CAMx air quality model. This approach shows significant improvement in the comparisons between ground-based and satellite-derived observations.
KeywordsAerosol Optical Depth Ozone Monitoring Instrument Differential Optical Absorption Spectroscopy Campaign Location Vertical Column Density
This study was supported by the Operational Program “Education and Lifelong Learning” of the National Strategic Reference Framework (NSRF), Research Funding Program: Aristeia, AVANTI, and the FP7-SPACE-2013-1 QA4ECV (Grant agreement no: 607405).
- Celarier EA et al (2008) Validation of Ozone Monitoring Instrument nitrogen dioxide columns, J. Geophys. Res., 113, D15S15, doi: 10.1029/2007JD008908
- ENVIRON (2010) User’s guide CAMx—comprehensive air quality model with extensions, Version 5.30, ENVIRON International Corporation, 415.899.0700, December 2010Google Scholar
- Hendrick F, Müller J-F, Clémer K, Wang P, De Mazière M, Fayt C, Gielen C, Hermans C, Ma JZ, Pinardi G, Stavrakou T, Vlemmix T, Van Roozendael M (2014) Four years of ground-based MAX-DOAS observations of HONO and NO2 in the Beijing area. Atmos Chem Phys 14:765–781. doi: 10.5194/acp-14-765-2014 CrossRefGoogle Scholar
- Kazadzis S, Bais AF, Balis D, Kouremeti N, Zempila M, Arola A, Giannakaki E, Amiridis V, Kazantzidis A (2009) Spatial and temporal UV irradiance and aerosol variability within the area of an OMI satellite pixel. Atmos Chem Phys 9:4593–4601. doi: 10.5194/acp-9-4593-2009
- Levelt, PF, J. van den Oord GH, Dobber MR, Ma ̈lkki A, Visser H, de Vries J, Stammes P, Lundell J, Saari H (2006) The ozone monitoring instrument, IEEE Trans. Geosci. Remote Sens, 44(5), 1093–1101, doi: 10.1109/TGRS.2006.872333
- Moussiopoulos Ν, Vlachokostas Ch, Tsilingiridis G, Douros I, Hourdakis E, Naneris C, Sidiropoulos C (2008) Air quality status in Greater Thessaloniki Area and the emission reductions needed for attaining the EU air quality legislation. Sci Total Environ 407:1268–1285. doi: 10.1016/j.scitotenv.2008.10.034 CrossRefGoogle Scholar
- Skamarock WC, Klemp JB, Dudhia J et al (2008) A description of the advanced research WRF version 3. NCAR Technical Note (NCAR/TN—475 + STR), Boulder, Colorado, USAGoogle Scholar