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| Titel |
Improving the representation of mixed-phase cloud microphysics in the ICON-LEM |
| VerfasserIn |
Juha Tonttila, Corinna Hoose, Jason Milbrandt, Hugh Morrison |
| Konferenz |
EGU General Assembly 2017
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| Medientyp |
Artikel
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| Sprache |
en
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 19 (2017) |
| Datensatznummer |
250148136
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| Publikation (Nr.) |
 EGU/EGU2017-12367.pdf |
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| Zusammenfassung |
| The representation of ice-phase cloud microphysics in ICON-LEM (the Large-Eddy
Model configuration of the ICOsahedral Nonhydrostatic model) is improved by
implementing the recently published Predicted Particle Properties (P3) scheme into the
model. In the typical two-moment microphysical schemes, such as that previously
used in ICON-LEM, ice-phase particles must be partitioned into several prescribed
categories. It is inherently difficult to distinguish between categories such as graupel and
hail based on just the particle size, yet this partitioning may significantly affect the
simulation of convective clouds. The P3 scheme avoids the problems associated with
predefined ice-phase categories that are inherent in traditional microphysics schemes by
introducing the concept of “free” ice-phase categories, whereby the prognostic
variables enable the prediction of a wide range of smoothly varying physical properties
and hence particle types. To our knowledge, this is the first application of the P3
scheme in a large-eddy model with horizontal grid spacings on the order of 100
m.
We will present results from ICON-LEM simulations with the new P3 scheme
comprising idealized stratiform and convective cloud cases. We will also present
real-case limited-area simulations focusing on the HOPE (HD(CP)2 Observational
Prototype Experiment) intensive observation campaign. The results are compared
with a matching set of simulations employing the two-moment scheme and the
performance of the model is also evaluated against observations in the context of the
HOPE simulations, comprising data from ground based remote sensing instruments. |
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