Preprints
https://doi.org/10.5194/acp-2022-364
https://doi.org/10.5194/acp-2022-364
 
30 May 2022
30 May 2022
Status: this preprint is currently under review for the journal ACP.

Water uptake and the gas-particle partitioning of nitrate aerosols

Hoang Duong Do1,2,a, Yong Bin Lim3, and Yong Pyo Kim3 Hoang Duong Do et al.
  • 1Department of Energy and Environment Engineering, University of Science and Technology, Daejeon, 34113, South Korea
  • 2Environment, Health, and Welfare Research Center, Korea Institute of Science and Technology, Seoul, 02792, South Korea
  • 3Department of Chemical Engineering and Material Science, Ewha Womans University, Seoul, 03760, South Korea
  • anow at: Institute of Energy and Climate Research: Troposphere (IEK-8), Forschungszentrum Jülich GmbH, Jülich, Germany

Abstract. Nitrate uptake into particles is an important feature of thermodynamic equilibriums responsible for the high-concentration particle formation in East Asia. However, key processes including the gas-particle partitioning of HNO3-NO3- and the deliquescence of particles, are not scrutinized in thermodynamic model simulations used in field studies. Using a humidified tandem differential mobility analyzer (HTDMA), we investigated water uptake and gas-particle partitioning of nitrates for inorganic and inorganic-organic aerosols as we simulated thermodynamic models (ISORROPIA-II and E-AIM). For the best-fit to HTDMA measurements, we revised thermodynamic model simulations and conducted linear regressions. Results demonstrated that ammonium nitrate aerosols maintained deliquescence in the entire range of 10–90 % relative humidity (RH) and in the range of 30–70 % RH the aerosol liquid water content (ALWC) and nitrates in ammonium-sulfate-nitrate aerosols simultaneously evaporated. Glyoxal exhibited hygroscopicity and a synergetic effect on ALWC formation with ammonium sulfates. In ammonium-sulfate-nitrate-glyoxal aerosols, more ALWC and nitrates formation above 50 % RH is likely due to the synergetic effect among ammonium, sulfates and nitrates. Considering that 30–80 % RH is haze conditions in East Asia, we propose that pronounced nitrate formation in particles beyond the description of current thermodynamic model simulations includes deliquescent nature of ammonium nitrate aerosols that undergo hysteresis with an unclear efflorescence RH point due to incomplete equilibriums, the evaporation of ALWC, nitrates and ammoniums in sulfate-rich aerosols, and the synergetic effect between organic and inorganic components on ALWC formation at high RH.

Hoang Duong Do et al.

Status: open (until 11 Jul 2022)

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Hoang Duong Do et al.

Hoang Duong Do et al.

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Short summary
Using HTDMA measurements and thermodynamic model simulations we found that 1) Nitrate aerosols maintain deliquescence in the entire range of 10–90% RH; 2) ALWC and nitrates in ammonium-sulfate-nitrate aerosols simultaneously evaporate; 3) Glyoxal exhibits a synergetic effect on ALWC formation with ammonium sulfates; and 4) In NH4-SO4-NO3-glyoxal aerosols, more ALWC and nitrates form above 50 % RH.
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