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Volume 16, issue 11 | Copyright

Special issue: The Modular Earth Submodel System (MESSy) (ACP/GMD inter-journal...

Atmos. Chem. Phys., 16, 7213-7237, 2016
© Author(s) 2016. This work is distributed under
the Creative Commons Attribution 3.0 License.

Research article 10 Jun 2016

Research article | 10 Jun 2016

Aerosol water parameterisation: a single parameter framework

Swen Metzger1,2,3, Benedikt Steil2, Mohamed Abdelkader2, Klaus Klingmüller2, Li Xu4, Joyce E. Penner5, Christos Fountoukis5,1, Athanasios Nenes6,7,8, and Jos Lelieveld1,2 Swen Metzger et al.
  • 1The Cyprus Institute, Nicosia, Cyprus
  • 2Max Planck Institute for Chemistry, Mainz, Germany
  • 3Eco-Serve, Freiburg, Germany
  • 4Department of Earth System Science, University of California, Irvine, USA
  • 5Atmospheric Science, University of Michigan, Ann Arbor, Michigan, USA
  • 6Institute of Chemical Engineering Sciences, Foundation for Research and Technology Hellas, Patras, Greece
  • 7Schools of Earth and Atmospheric Sciences and Chemical and Biomolecular Engineering, Georgia Institute of Technology, Atlanta, GA, USA
  • 8Institute of Environmental Research and Sustainable Development, National Observatory of Athens, Palea Penteli, Greece

Abstract. We introduce a framework to efficiently parameterise the aerosol water uptake for mixtures of semi-volatile and non-volatile compounds, based on the coefficient, νi. This solute-specific coefficient was introduced in Metzger et al. (2012) to accurately parameterise the single solution hygroscopic growth, considering the Kelvin effect – accounting for the water uptake of concentrated nanometer-sized particles up to dilute solutions, i.e. from the compounds relative humidity of deliquescence (RHD) up to supersaturation (Köhler theory). Here we extend the νi parameterisation from single to mixed solutions. We evaluate our framework at various levels of complexity, by considering the full gas–liquid–solid partitioning for a comprehensive comparison with reference calculations using the E-AIM, EQUISOLV II and ISORROPIA II models as well as textbook examples. We apply our parameterisation in the EQuilibrium Simplified Aerosol Model V4 (EQSAM4clim) for climate simulations, implemented in a box model and in the global chemistry–climate model EMAC. Our results show (i) that the νi approach enables one to analytically solve the entire gas–liquid–solid partitioning and the mixed solution water uptake with sufficient accuracy, (ii) that ammonium sulfate mixtures can be solved with a simple method, e.g. pure ammonium nitrate and mixed ammonium nitrate and (iii) that the aerosol optical depth (AOD) simulations are in close agreement with remote sensing observations for the year 2005. Long-term evaluation of the EMAC results based on EQSAM4clim and ISORROPIA II will be presented separately.

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We introduce an unique single parameter framework to efficiently parameterize the aerosol water uptake for mixtures of semi-volatile and non-volatile compounds, being entirely based on the single solute specific coefficient introduced in Metzger et al. (2012).
We introduce an unique single parameter framework to efficiently parameterize the aerosol water...