EGU21-8105, updated on 04 Mar 2021
https://doi.org/10.5194/egusphere-egu21-8105
EGU General Assembly 2021
© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.

Heterogeneous uptake of NH3 on ambient PM2.5 in Beijing and Shijiazhuang: Possible influence of aerosol acidity

Yongchun Liu1, Zeming Feng1, Junlei Zhan1, and Xiaolei Bao2
Yongchun Liu et al.
  • 1Beijing University of Chemical Technology, Beijing Advanced Innovation center for Soft Matter Science and Engineering, Beijing, China (liuyc@buct.edu.cn)
  • 2Hebei Provincial Academy of Environmental Sciences, Shijiazhuang, 050037, China

Ammonium salts (NH4+) is the important component of PM2.5 and has a significant impact on air quality, climate, human health, and natural ecosystems. The contribution of NH4+ to PM2.5 is increasing at urban sites. Ammonia (NH3) with global emissions estimated at greater than 33 Tg(N) Yr-1 is the only precursor of particulate NH4+ in the atmosphere. Thus, it is important to understand the conversion kinetics from NH3 to NH4+ in the atmosphere. However, the uptake coefficient of NH3NH3) on aerosol particles are scarce at the present time. In this work, we reported the γNH3 on ambient PM2.5 in Beijing and Shijiazhuang in China. The γNH3 values on ambient PM2.5 are (1.13±12.4)×10-4 and (6.88±40.7)×10-4 in Shijiazhuang and Beijing, respectively. They are significantly lower than those on sulfuric acid droplet (0.1-1), aqueous surface (~5×10-3-0.1) and acidified secondary organic aerosol (~10-3-~10-2), while are comparable with that on ice surface (5.3±2.2 ×10-4) and on sulfuric acid in the presence of organic gases (2×10-4-4×10-3). An annual increase of γNH3 in the statistic sense is observed and the possible reason related to the aerosol acidity has also been discussed.

How to cite: Liu, Y., Feng, Z., Zhan, J., and Bao, X.: Heterogeneous uptake of NH3 on ambient PM2.5 in Beijing and Shijiazhuang: Possible influence of aerosol acidity, EGU General Assembly 2021, online, 19–30 Apr 2021, EGU21-8105, https://doi.org/10.5194/egusphere-egu21-8105, 2021.

Corresponding presentation materials formerly uploaded have been withdrawn.