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https://doi.org/10.5194/acp-2020-1047
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/acp-2020-1047
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

  02 Nov 2020

02 Nov 2020

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Measurement report: Exploring the NH3 behaviours at urban and suburban Beijing: Comparison and implications

Ziru Lan1, Weili Lin1, Weiwei Pu2, and Ziqiang Ma2,3 Ziru Lan et al.
  • 1College of Life and Environmental Sciences, Minzu University of China, Beijing 100081
  • 2Environmental Meteorological Forecast Center of Beijing-Tianjin-Hebei, Beijing, 100089, China
  • 3Beijing Shangdianzi Regional Atmosphere Watch Station, Beijing, 101507, China

Abstract. Ammonia (NH3) plays an important role in particulate matter formation; however, few long-term observations with a high temporal resolution have been conducted on the NH3 concentrations in Beijing. In this study, online ammonia analyzers were used to observe continuously the atmospheric NH3 concentrations at an urban site and a suburban site in Beijing from January 13, 2018, to January 13, 2019. The average mixing ratio of NH3 at the urban site was 21 ± 14 ppb (range: 1.6–133 ppb) and that at the suburban site was 22 ± 15 ppb (range: 0.8–199 ppb). The NH3 mixing ratios at the urban and suburban sites exhibited similar seasonal variations, with high values being observed in the summer and spring and low values being observed in the autumn and winter. The hourly mean NH3 mixing ratios at the urban site were highly correlated (R = 0.849, P < 0.01) with those at the suburban site. However, the average diurnal variations in the NH3 mixing ratios at the urban and suburban sites differed significantly, which indicated the different contributions of NH3 sources and sinks at the urban and suburban sites. In addition to the emission sources, meteorological factors were closely related to the changes in the NH3 concentrations. For the same temperature (relative humidity) at the urban and suburban sites, the NH3 mixing ratios increased with the relative humidity (temperature). The relative humidity was the factor with the strongest influence on the NH3 mixing ratio in different seasons at the two sites. In general, a high wind speed promoted a reduction in the NH3 mixing ratio. Similar with other primary pollutants in Beijing, the NH3 mixing ratios were high when winds originated from the south and low when winds originated from the north and northwest.

Ziru Lan et al.

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Latest update: 24 Nov 2020
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Short summary
Haze related with particulate matter has been a big problem in eastern China. Ammonia (NH3) plays an important role in secondary particulate matter formation. The variations in NH3 were found that the contributions of NH3 sources on the urban and suburban areas were quite different, although they were under the influence of similar weather systems. The studies help us to understand the NH3 behaviors at a megacity environment.
Haze related with particulate matter has been a big problem in eastern China. Ammonia (NH3)...
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