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Geoscientific Model Development An interactive open-access journal of the European Geosciences Union
https://doi.org/10.5194/gmd-2018-96
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
Model description paper
23 Apr 2018
Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Geoscientific Model Development (GMD).
libcloudph++ 1.1: aqueous phase chemistry extension of the Lagrangian cloud microphysics scheme
Anna Jaruga and Hanna Pawlowska Institute of Geophysics, Faculty of Physics, University of Warsaw, Warsaw, Poland
Abstract. This paper introduces a new scheme available in the library of algorithms for representing cloud microphysics in numerical models named libcloudph++. The scheme extends the Lagrangian microphysics scheme available in libcloudph++ to the aqueous phase chemical processes occurring within cloud droplets. The representation of chemical processes focuses on the aqueous phase oxidation of the dissolved SO2 by O3 and H2O2. The Lagrangian Microphysics and Chemistry (LMC) scheme allows tracking the changes in the cloud condensation nuclei (CCN) distribution caused by both collisions between cloud droplets and aqueous phase oxidation.

The scheme is implemented in C++ and equipped with bindings to Python which allow reusing the created scheme from models implemented in other programming languages. The scheme can be used on either CPU or GPU, and is distributed under the GPL3 license. Here, the LMC scheme is tested in a simple 0-dimensional adiabatic parcel model and then used in a 2-dimensional prescribed flow framework. The results are discussed with the focus on changes to the CCN sizes and compared with other model simulations discussed in the literature.

Citation: Jaruga, A. and Pawlowska, H.: libcloudph++ 1.1: aqueous phase chemistry extension of the Lagrangian cloud microphysics scheme, Geosci. Model Dev. Discuss., https://doi.org/10.5194/gmd-2018-96, in review, 2018.
Anna Jaruga and Hanna Pawlowska
Anna Jaruga and Hanna Pawlowska
Anna Jaruga and Hanna Pawlowska

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Short summary
libcloudph++ is a free and open-source library of schemes representing cloud microphysics (e.g. condensation of water vapour into cloud droplets, collisions between water drops, precipitation) in numerical models. This work adds new schemes that represent aqueous chemical reactions in water drops. The schemes focus on the oxidation of SO2 by O3 and H2O2. The libcloudph++ is now capable of resolving the changes of aerosol sizes caused by both collisions between water drops and aqueous oxidation.
libcloudph++ is a free and open-source library of schemes representing cloud microphysics (e.g....
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