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 was under review for the journal ACP but the revision was not accepted.

Water uptake and the gas-particle partitioning of nitrate aerosols

Hoang Duong Do, Yong Bin Lim, and Yong Pyo Kim

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, Yong Bin Lim, and Yong Pyo Kim

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on acp-2022-364', Anonymous Referee #1, 01 Aug 2022
    • AC1: 'Reply on RC1', Yong Lim, 06 Sep 2022
  • RC2: 'Comment on acp-2022-364', Anonymous Referee #2, 07 Sep 2022

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on acp-2022-364', Anonymous Referee #1, 01 Aug 2022
    • AC1: 'Reply on RC1', Yong Lim, 06 Sep 2022
  • RC2: 'Comment on acp-2022-364', Anonymous Referee #2, 07 Sep 2022
Hoang Duong Do, Yong Bin Lim, and Yong Pyo Kim
Hoang Duong Do, Yong Bin Lim, and Yong Pyo Kim

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Latest update: 24 Mar 2024
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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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