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Geoscientific Model Development An interactive open-access journal of the European Geosciences Union
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https://doi.org/10.5194/gmd-2020-170
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/gmd-2020-170
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

Submitted as: development and technical paper 22 Jun 2020

Submitted as: development and technical paper | 22 Jun 2020

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This preprint is currently under review for the journal GMD.

Optimization of Sulfate Aerosol Hygroscopicity Parameter in WRF-Chem version (3.8.1)

Ah-Hyun Kim, Seong Soo Yum, Dong Yeong Chang, and Minsu Park Ah-Hyun Kim et al.
  • Department of Atmospheric Sciences, YonseiUniversity, Seoul, postal 03722, Korea

Abstract. A new sulfate aerosol hygroscopicity parameter (κSO4) parameterization is suggested that is capable of considering the two major sulfate aerosols, H2SO4 and (NH4)2SO4, using the molar ratio of ammonium to sulfate (R). An alternative κSO4 parameterization method is also suggested that utilizes typical geographical distribution patterns of sulfate and ammonium, which can be used when ammonium data is not available for model calculation. Using the Weather Research and Forecasting coupled with Chemistry model (WRF-Chem), impacts of different κSO4 parameterizations on cloud microphysical properties and cloud radiative effects in East Asia are examined. Comparisons with the observational data obtained from an aircraft field campaign suggest that the new κSO4 parameterizations simulate more reliable aerosol and CCN concentrations, especially over the sea in East Asia than the original κSO4 parameterization in WRF-Chem that assumes sulfate aerosols as (NH4)2SO4 only. With the new κSO4 parameterizations, the simulated cloud microphysical properties and precipitation became significantly different, resulting in greater cloud albedo effect of about −1.5 W m−2 in East Asia than that with the original κSO4 parameterization. The new κSO4 parameterizations are simple and readily applicable to numerical studies of investigating the impact of sulfate aerosols in aerosol-cloud interactions without additional computational expenses.

Ah-Hyun Kim et al.

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Ah-Hyun Kim et al.

Ah-Hyun Kim et al.

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Latest update: 22 Sep 2020
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Short summary
A new method to estimate sulfate aerosol hygroscopicity parameter (κSO4) is suggested, which can consider κSO4 for two different sulfate species, instead of prescribing a single κSO4 as in most previous studies. The new method simulates more realistic cloud droplet concentrations, thus more realistic cloud albedo effect than the original method. The new method is simple and readily applicable to modeling studies of investigating sulfate aerosols’ effect in aerosol-cloud interactions.
A new method to estimate sulfate aerosol hygroscopicity parameter (κSO4) is suggested, which...
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