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Atmospheric Chemistry and Physics An interactive open-access journal of the European Geosciences Union
https://doi.org/10.5194/acp-2018-450
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
Research article
05 Jun 2018
Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Atmospheric Chemistry and Physics (ACP).
Aerosol water parameterization: long-term evaluation and importance
Swen Metzger1,2,a, Mohamed Abdelkader1,2,b, Benedikt Steil2, and Klaus Klingmüller2 1Energy, Environment and Water Research Center, The Cyprus Institute, Nicosia, Cyprus
2Air Chemistry Department, Max Planck Institute for Chemistry, Mainz, Germany
anow at: ResearchConcepts io GmbH, Freiburg im Breisgau, Germany
bnow at: King Abdullah University of Science and Technology, Saudi Arabia
Abstract. We scrutinize the importance of aerosol water for the aerosol optical depth (AOD) calculations by a long-term evaluation of the EQuilibrium Simplified Aerosol Model V4 for climate modeling, which was introduced by Metzger et al. (2016a). EQSAM4clim is based on a sin-gle solute coefficient approach that efficiently parameterizes hygroscopic growth, account- ing for aerosol water uptake from the deliquescence relative humidity up to supersaturation. EQSAM4clim extends the single solute coefficient approach to treat water uptake of multi- component mixtures. The gas-aerosol partitioning and the mixed solution water uptake can be solved analytically, preventing the need for iterations, which is computationally efficient. EQSAM4clim has been implemented in the global chemistry climate model EMAC and com- pared to ISORROPIA II (Fountoukis and Nenes, 2007) at climate time-scales. Our global modeling results show that (I) our EMAC results of the aerosol optical depth (AOD) are comparable to independent results of Pozzer et al. (2015) for the period 2000–2010, (II) the results of various aerosol properties of EQSAM4clim and ISORROPIA II are similar and in agreement with AERONET and EMEP observations for the period 2000–2013, and (III) that the underlying assumptions on the aerosol water uptake limitations are important for derived AOD calculations. Sensitivity studies of different levels of chemical aging and associated water uptake show larger effects on AOD calculations for the year 2005 compared to the differences associated with the application of the two gas-liquid-solid partitioning schemes. Altogether, our study reveals the importance of the aerosol water for climate applications.
Citation: Metzger, S., Abdelkader, M., Steil, B., and Klingmüller, K.: Aerosol water parameterization: long-term evaluation and importance, Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2018-450, in review, 2018.
Swen Metzger et al.
Swen Metzger et al.
Swen Metzger et al.

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The work scrutinize the importance of aerosol water for the aerosol optical depth calculations by a long-term evaluation of the global chemistry climate and Earth system model EMAC through a comparison of EQSAM4clim and ISORROPIA II with observations at climate time-scales. Sensitivity studies with different levels of chemical aging and associated water uptake reveal the importance of aerosol water for climate modeling studies.
The work scrutinize the importance of aerosol water for the aerosol optical depth calculations...
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