Geoscientific Model Development
Geoscientific Model Development
GMD
Articles | Volume 11, issue 4
Articles | Volume 11, issue 4
https://doi.org/10.5194/gmd-11-1557-2018
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/gmd-11-1557-2018
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 11, issue 4
Development and technical paper
 | 
18 Apr 2018
Development and technical paper |  | 18 Apr 2018

Prognostic parameterization of cloud ice with a single category in the aerosol-climate model ECHAM(v6.3.0)-HAM(v2.3)

Remo Dietlicher, David Neubauer, and Ulrike Lohmann

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Short summary
A new cloud scheme was implemented in the aerosol–climate model ECHAM6-HAM2. Unlike traditional schemes, it does not categorize ice particles by in-cloud and precipitation types but uses a single category with prognostic bulk particle properties. The new scheme is not only conceptually simpler but also closer to first principles as it does not rely on weakly constrained conversion rates between predefined categories and resolves falling ice by local sub-time-stepping.
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