ACPD Atmospheric Chemistry and Physics Discussions ACPD Atmos. Chem. Phys. Discuss. 1680-7375 Göttingen, Germany 10.5194/acpd-10-30305-2010 A minimum bulk microphysics Yano J.-I. 1 Bouniol D. 1 GAME/CNRS, CNRS-INSU-Météo France, URA 1357, Toulouse, France 13 12 2010 10 12 30305 30345 Copyright: © 2010 J.-I. Yano 2010 This work is licensed under the Creative Commons Attribution 3.0 Unported License. To view a copy of this licence, visit https://creativecommons.org/licenses/by/3.0/ This article is available from https://acp.copernicus.org/preprints/10/30305/2010/acpd-10-30305-2010.html The full text article is available as a PDF file from https://acp.copernicus.org/preprints/10/30305/2010/acpd-10-30305-2010.pdf

Cloud microphysics present extreme complexities, and even under bulk approaches, the formulation tends to be involved. A minimum microphysics is proposed, aimed at applications for geophysical fluid dynamics, by a maximum simplification of a standard bulk formulation. The proposed formulation is also independently derived by a simple phenomenological argument. The formulational structure of the bulk microphysics is also discussed. The autoconversion process formulation is discussed separately in a phenomenological manner, because a formal application of the bulk approach becomes involved. Four major possible formulations for autoconversion are identified. The proposed formulation is tested with a nonhydrostatic anelastic model under segmentally-constant approximation (NAM-SCA).

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