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Mathematics of Climate and Weather Forecasting

Ed. by Khouider, Boualem

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2353-6438
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Intercomparison of Warm-Rain Bulk Microphysics Schemes using Asymptotics

Juliane Rosemeier / Manuel Baumgartner / Peter Spichtinger
Published Online: 2018-12-31 | DOI: https://doi.org/10.1515/mcwf-2018-0005

Abstract

Clouds are important components of the atmosphere. As it is usually not possible to treat them as ensembles of huge numbers of particles, parameterizations on the basis of averaged quantities (mass and/or number concentration) must be derived. Since no first-principles derivations of such averaged schemes are available today, many alternative approximating schemes of cloud processes exist. Most of these come in the form of nonlinear differential equations. It is unclear whether these different cloud schemes behave similarly under controlled local conditions, and much less so when they are embedded dynamically in a full atmospheric flow model. We use mathematical methods from the theory of dynamical systems and asymptotic analysis to compare two operational cloud schemes and one research scheme qualitatively in a simplified context in which the moist dynamics is reduced to a system of ODEs. It turns out that these schemes behave qualitatively differently on shorter time scales, whereas at least their long time behavior is similar under certain conditions. These results show that the quality of computational forecasts of moist atmospheric flows will generally depend strongly on the formulation of the cloud schemes used.

Keywords: Cloud Model; Predictability; Asymptotic Analysis

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About the article

Received: 2018-08-28

Accepted: 2018-12-18

Published Online: 2018-12-31

Published in Print: 2018-12-01


Citation Information: Mathematics of Climate and Weather Forecasting, Volume 4, Issue 1, Pages 104–124, ISSN (Online) 2353-6438, DOI: https://doi.org/10.1515/mcwf-2018-0005.

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© by Juliane Rosemeier, et al., published by De Gruyter. This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License. BY-NC-ND 4.0

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