Articles | Volume 24, issue 12
https://doi.org/10.5194/acp-24-7027-2024
https://doi.org/10.5194/acp-24-7027-2024
Research article
 | 
18 Jun 2024
Research article |  | 18 Jun 2024

Interpreting Geostationary Environment Monitoring Spectrometer (GEMS) geostationary satellite observations of the diurnal variation in nitrogen dioxide (NO2) over East Asia

Laura Hyesung Yang, Daniel J. Jacob, Ruijun Dang, Yujin J. Oak, Haipeng Lin, Jhoon Kim, Shixian Zhai, Nadia K. Colombi, Drew C. Pendergrass, Ellie Beaudry, Viral Shah, Xu Feng, Robert M. Yantosca, Heesung Chong, Junsung Park, Hanlim Lee, Won-Jin Lee, Soontae Kim, Eunhye Kim, Katherine R. Travis, James H. Crawford, and Hong Liao

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Cited articles

Bae, M., Yoo, C., Kim, H., and Kim, S.: Developing Temporal Allocation Profiles for Electric Generating Utilities based on the CleanSYS Real-time Emissions, Journal of Korean Society for Atmospheric Environment, 37, 338–354, https://doi.org/10.5572/KOSAE.2021.37.2.338, 2021. 
Boersma, K. F., Jacob, D. J., Eskes, H. J., Pinder, R. W., Wang, J., and van der A, R. J.: Intercomparison of SCIAMACHY and OMI tropospheric NO2 columns: Observing the diurnal evolution of chemistry and emissions from space, J. Geophys. Res., 113, D16S26, https://doi.org/10.1029/2007JD008816, 2008. 
Boersma, K. F., Jacob, D. J., Trainic, M., Rudich, Y., DeSmedt, I., Dirksen, R., and Eskes, H. J.: Validation of urban NO2 concentrations and their diurnal and seasonal variations observed from the SCIAMACHY and OMI sensors using in situ surface measurements in Israeli cities, Atmos. Chem. Phys., 9, 3867–3879, https://doi.org/10.5194/acp-9-3867-2009, 2009. 
Chang, L.-S., Kim, D., Hong, H., Kim, D.-R., Yu, J.-A., Lee, K., Lee, H., Kim, D., Hong, J., Jo, H.-Y., and Kim, C.-H.: Evaluation of correlated Pandora column NO2 and in situ surface NO2 measurements during GMAP campaign, Atmos. Chem. Phys., 22, 10703–10720, https://doi.org/10.5194/acp-22-10703-2022, 2022. 
Cheng, N., Li, Y., Sun, F., Chen, C., Wang, B., Li, Q., Wei, P., and Cheng, B.: Ground-Level NO2 in Urban Beijing: Trends, Distribution, and Effects of Emission Reduction Measures, Aerosol Air Qual. Res., 18, 343–356, https://doi.org/10.4209/aaqr.2017.02.0092, 2018. 
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The Geostationary Environment Monitoring Spectrometer (GEMS) provides hourly measurements of NO2. We use the chemical transport model to find how emissions, chemistry, and transport drive the changes in NO2 observed by GEMS at different times of the day. In winter, the chemistry plays a minor role, and high daytime emissions dominate the diurnal variation in NO2, balanced by transport. In summer, emissions, chemistry, and transport play an important role in shaping the diurnal variation in NO2.
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