Journal cover Journal topic
Geoscientific Model Development An interactive open-access journal of the European Geosciences Union
doi:10.5194/gmd-2016-186
© Author(s) 2016. This work is distributed
under the Creative Commons Attribution 3.0 License.
Model evaluation paper
25 Aug 2016
Review status
This discussion paper is under review for the journal Geoscientific Model Development (GMD).
Implementation of aerosol-cloud interactions in the regional atmosphere-aerosol model COSMO-MUSCAT and evaluation using satellite data
Dipu Sudhakar1, Johannes Quaas1, Ralf Wolke2, Jens Stoll2, Andreas Mühlbauer3, Marc Salzmann1, Bernd Heinold2, and Ina Tegen2 1Institute for Meteorology, Universität Leipzig, Germany
2Leibniz Institute for Tropical Research, Germany
3FM Global Research, Norwood, MA, USA
Abstract. The regional atmospheric model Consortium for Small Scale Modeling (COSMO) coupled to the MultiScale Chemistry Aerosol Transport model (MUSCAT), is extended in this work to represent aerosol-cloud interactions. Previously, only one-way interactions (scavenging of aerosol and in-cloud chemistry) and aerosol-radiation interactions were included in this model. The new version allows for a microphysical aerosol effect on clouds. For this, we use the optional two-moment cloud microphysical scheme in COSMO and the online-computed aerosol information for cloud condensation nuclei (CCN) concentrations, replacing the constant CCN concentration profile. In the radiation scheme, we implement a droplet-size-dependent cloud optical depth, allowing now for aerosol-cloud-radiation interactions. In order to evaluate the model with satellite data, the Cloud Feedback Model Inter-comparison Project Observational Simulator Package (COSP) has been implemented. A case study has been carried out to understand the effects of the modifications, in which the modified modeling system was applied over the European domain with a horizontal resolution of 0.25° × 0.25°. It is found that the online coupled aerosol introduces significant changes for some cloud microphysical properties. The cloud effective radius shows an increase of 2 to 10 μm, and the cloud droplet number concentration is reduced by 10 to 50 cm−3. For both quantities, the new model version shows a better agreement with the satellite data. The microphysics modifications have a smaller effect on other parameters such as optical depth, cloud water content, and cloud fraction.

Citation: Sudhakar, D., Quaas, J., Wolke, R., Stoll, J., Mühlbauer, A., Salzmann, M., Heinold, B., and Tegen, I.: Implementation of aerosol-cloud interactions in the regional atmosphere-aerosol model COSMO-MUSCAT and evaluation using satellite data, Geosci. Model Dev. Discuss., doi:10.5194/gmd-2016-186, in review, 2016.
Dipu Sudhakar et al.
Dipu Sudhakar et al.
Dipu Sudhakar et al.

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