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Open AccessArticle

Fine-Scale Columnar and Surface NOx Concentrations over South Korea: Comparison of Surface Monitors, TROPOMI, CMAQ and CAPSS Inventory

1
Air Resources Laboratory, National Oceanic and Atmospheric Administration, College Park, MD 20740, USA
2
Cooperative Institute for Satellite Earth System Studies, University of Maryland, College Park, MD 20740, USA
3
Department of Environmental and Safety Engineering, Ajou University, Suwon 16499, Korea
4
Department of Atmospheric Science, Kongju National University, Gongju 32588, Korea
5
Georgia Environmental Protection Division, Atlanta, GA 30354, USA
*
Authors to whom correspondence should be addressed.
Atmosphere 2020, 11(1), 101; https://doi.org/10.3390/atmos11010101
Received: 14 November 2019 / Revised: 7 January 2020 / Accepted: 9 January 2020 / Published: 15 January 2020
(This article belongs to the Special Issue Recent Advances of Air Pollution Studies in South Korea)
Fine-scale nitrogen oxide (NOx) concentrations over South Korea are examined using surface observations, satellite data and high-resolution model simulations based on the latest emission inventory. While accurate information on NOx emissions in South Korea is crucial to understanding regional air quality in the region, consensus on the validation of NOx emissions is lacking. We investigate the spatial and temporal variation in fine-scale NOx emission sources over South Korea. Surface observations and newly available fine-scale satellite data (TROPOspheric Monitoring Instrument; TROPOMI; 3.5 × 7 km2) are compared with the community multiscale air quality (CMAQ) model based on the clean air policy support system (CAPSS) 2016 emission inventory. The results show that the TROPOMI NO2 column densities agree well with the CMAQ simulations based on CAPSS emissions (e.g., R = 0.96 for June 2018). The surface observations, satellite data and model are consistent in terms of their spatial distribution, the overestimation over the Seoul Metropolitan Area and major point sources; however, the model tends to underestimate the surface concentrations during the cold season. View Full-Text
Keywords: air quality; NOx; emission inventory; CMAQ; TROPOMI air quality; NOx; emission inventory; CMAQ; TROPOMI
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MDPI and ACS Style

Kim, H.C.; Kim, S.; Lee, S.-H.; Kim, B.-U.; Lee, P. Fine-Scale Columnar and Surface NOx Concentrations over South Korea: Comparison of Surface Monitors, TROPOMI, CMAQ and CAPSS Inventory. Atmosphere 2020, 11, 101.

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