- Working Paper
Rights / licenseCreative Commons Attribution 3.0 Unported
A double–moment bulk microphysics scheme for modelling cirrus clouds including ex-plicit impact of aerosols on different types of nucleation mechanism is described. Pro-cess rates are formulated in terms of generalised moments of the underlying a priorisize distributions in order to allow simple switching between various distribution types.5The scheme has been implemented into a simple box model and into the anelastic non-hydrostatic model EULAG. The new microphysics is validated against simulations withdetailed microphysics for idealised process studies and for a well documented case ofarctic cirrostratus. Additionally, the formation of ice crystals with realistic backgroundaerosol concentration is modelled and the effect of ambient pressure on homogeneous10nucleation is investigated in the box model. The arctic cirrostratus case study is alsosupplemented with sensitivity studies including different vertical velocities, temperaturefluctuations and wind shear. The model stands all tests and is thus suitable for cloud–resolving simulations of cirrus clouds. Last but not least, some new results are shown,corroborating the importance of sedimentation and dynamics inside cirrus clouds for15forming the structure of the cirrus. Show more
Journal / seriesAtmospheric Chemistry and Physics Discussions
Pages / Article No.
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Is previous version of: https://doi.org/10.3929/ethz-b-000115987
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