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Volume 11, issue 9 | Copyright
Geosci. Model Dev., 11, 3623-3645, 2018
https://doi.org/10.5194/gmd-11-3623-2018
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Model description paper 06 Sep 2018

Model description paper | 06 Sep 2018

libcloudph++ 2.0: aqueous-phase chemistry extension of the particle-based cloud microphysics scheme

Anna Jaruga and Hanna Pawlowska 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 particle-based microphysics scheme with a Monte Carlo coalescence 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 particle-based microphysics and chemistry scheme allows for tracking of 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. The scheme can be used on either a CPU or a GPU, and is distributed under the GPLv3 license. Here, the particle-based microphysics and chemistry 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 a focus on changes to the CCN sizes and comparison with other model simulations discussed in the literature.

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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 in 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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