Preprints
https://doi.org/10.5194/egusphere-2024-946
https://doi.org/10.5194/egusphere-2024-946
18 Jun 2024
 | 18 Jun 2024
Status: this preprint is open for discussion.

LIMA (v2.0): A full two-moment cloud microphysical scheme for the mesoscale non-hydrostatic model Meso-NH v5-6

Marie Taufour, Jean-Pierre Pinty, Christelle Barthe, Benoît Vié, and Chien Wang

Abstract. A full two-moment microphysics parameterisation of the LIMA scheme (hereafter named LIMA v2.0) has been developed and successfully implemented in the Meso-NH cloud-resolving model. The novelty of the scheme is a set of prognostic equations of the number concentration of each precipitating ice category (snow-aggregates, graupel and hail), in complement to the prediction of the mass mixing ratios. As a result, new microphysical conversion rates are introduced and explicitly computed using the size distributions of the hydrometeors.

The new LIMA v2.0 scheme has been tested for an idealized deep convection case against the original LIMA scheme characterized by an empirical number concentration-mixing ratio relationship applied to the precipitating ice. Inclusion of number concentration equations for the snow-aggregates and graupel significantly alters the microphysical structure and dynamical evolution of the simulated supercell. When comparing to the results obtained with the previous version of LIMA, the new v2.0 of the scheme tends to increase the pristine ice mixing ratio, to decrease the other ice hydrometeors, and to enhance the feedbacks between raindrops and the ice phase. The new scheme is also more efficient to produce earlier raindrops at ground level and to reduce hail precipitation. 

Publisher's note: Copernicus Publications remains neutral with regard to jurisdictional claims made in the text, published maps, institutional affiliations, or any other geographical representation in this preprint. The responsibility to include appropriate place names lies with the authors.
Marie Taufour, Jean-Pierre Pinty, Christelle Barthe, Benoît Vié, and Chien Wang

Status: open (until 13 Aug 2024)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
Marie Taufour, Jean-Pierre Pinty, Christelle Barthe, Benoît Vié, and Chien Wang
Marie Taufour, Jean-Pierre Pinty, Christelle Barthe, Benoît Vié, and Chien Wang

Viewed

Total article views: 151 (including HTML, PDF, and XML)
HTML PDF XML Total BibTeX EndNote
107 33 11 151 9 6
  • HTML: 107
  • PDF: 33
  • XML: 11
  • Total: 151
  • BibTeX: 9
  • EndNote: 6
Views and downloads (calculated since 18 Jun 2024)
Cumulative views and downloads (calculated since 18 Jun 2024)

Viewed (geographical distribution)

Total article views: 138 (including HTML, PDF, and XML) Thereof 138 with geography defined and 0 with unknown origin.
Country # Views %
  • 1
1
 
 
 
 
Latest update: 24 Jul 2024
Download
Short summary
We have developed a complete 2-moment version of the LIMA microphysics scheme. We have focused on collection processes, where the hydrometeor number transfer is often estimated in proportion to the mass transfer. The impact of these parameterisations on a convective system and the prospects for more realistic estimates of secondary parameters (reflectivity, hydrometeor size) are shown in a first test on an idealised case.