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Geoscientific Model Development An interactive open-access journal of the European Geosciences Union
https://doi.org/10.5194/gmd-2017-203
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 4.0 License.
Model evaluation paper
09 Oct 2017
Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Geoscientific Model Development (GMD).
Global high-resolution simulations of tropospheric nitrogen dioxide using CHASER V4.0
Takashi Sekiya1, Kazuyuki Miyazaki1,2, Koji Ogochi1, Kengo Sudo3,1, and Masayuki Takigawa1 1Japan Agency for Marine-Earth Science and Technology, Yokohama, Japan
2Jet Propulsion Laboratory-California Institute of Technology, Pasadena, CA, USA
3Graduate School of Environmental Studies, Nagoya University, Nagoya, Japan
Abstract. We evaluate global tropospheric nitrogen dioxide (NO2) simulations using the CHASER V4.0 global chemical transport model (CTM) at horizontal resolutions ranging from 0.56° to 2.8°. Model evaluation was conducted using satellite tropospheric NO2 retrievals from the Ozone Monitoring Instrument (OMI) and the Global Ozone Monitoring Experiment-2 (GOME-2), and aircraft observations from the 2014 Front Range Air Pollution and Photochemistry Experiment (FRAPPÉ). Agreement against satellite retrievals improved greatly at 0.56° and 1.1° resolutions (compared to 2.8° resolution) over polluted and biomass burning regions. A resolution of 0.56° was necessary to improve model performance over areas with strong local sources, with mean bias reductions of 67 % over Beijing, 62 % over Tokyo, and 73 % over San Francisco in summer. Validation using aircraft observations indicated that high-resolution simulations reduced negative NO2 biases below 700 hPa over the Denver metropolitan area. These improvements in high-resolution simulations were attributable to (1) closer spatial representativeness between simulations and observations and (2) better representation of large-scale concentration fields (i.e., at 2.8°) through consideration of small-scale processes. Model evaluations conducted at 0.5°- and 2.8°-bin grids indicated that the contributions of both these processes were comparable over most polluted regions, whereas the latter effect (2) made a larger contribution (of up to 90 %) over eastern China and biomass burning areas. The evaluations presented in this paper demonstrate the potential of using a high-resolution global CTM for studying megacity-scale air pollutants across the entire globe, potentially also contributing to global satellite retrievals and chemical data assimilation.

Citation: Sekiya, T., Miyazaki, K., Ogochi, K., Sudo, K., and Takigawa, M.: Global high-resolution simulations of tropospheric nitrogen dioxide using CHASER V4.0, Geosci. Model Dev. Discuss., https://doi.org/10.5194/gmd-2017-203, in review, 2017.
Takashi Sekiya et al.
Takashi Sekiya et al.
Takashi Sekiya et al.

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Short summary
We evaluate global tropospheric NO2 simulations using chemical transport model (CTM) at horizontal resolutions ranging from 0.56° to 2.8°. Agreement against satellite retrievals improved greatly at 0.56° and 1.1° resolutions (compared to 2.8°) over polluted and biomass burning regions, especially over areas with strong local sources such as megacity. The evaluations demonstrate the potential of using a high-resolution global CTM for studying megacity-scale air pollutants across the entire globe.
We evaluate global tropospheric NO2 simulations using chemical transport model (CTM) at...
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