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Instituto de Ciencias de la Atmósfera y Cambio Climático, UNAM
Revista
Repositorio
Contacto
Revistas UNAM. Dirección General de Publicaciones y Fomento Editorial, UNAM en revistas@unam.mx
Donet, Lainer, et al. (2024). Development and evaluation of a bulk three-moment parameterization scheme incorporating the processes of sedimentation and collision-coalescence. Atmósfera; Vol. 38, 2024; 1-21. Recuperado de https://repositorio.unam.mx/contenidos/4140647
Autor(es)
Donet, Lainer; Alfonso, Lester
Tipo
Artículo de Investigación
Área del conocimiento
Físico Matemáticas y Ciencias de la Tierra
Título
Development and evaluation of a bulk three-moment parameterization scheme incorporating the processes of sedimentation and collision-coalescence
Fecha
2023-08-01
Resumen
There are a few three-moment schemes that consider other processes besides sedimentation. Thus, a performance assessment of these types of schemes due to the combined effect of sedimentation and other microphysical processes is a matter of interest. In this study, a warm rain bulk three-moment parameterized scheme was developed and evaluated through a detailed comparison with a bin microphysical scheme. To evaluate the impact of sedimentation and the combined effect of sedimentation and collision-coalescence on the droplet size distribution (DSD), a rain shaft model was applied to the DSD with different initial values of the shape parameter. For pure sedimentation, a good correspondence was obtained between the three-moment scheme and the explicit model, with a practically perfect coincidence of bulk quantities for larger values of the gamma distribution’s initial shape parameter and, in general, the three-moment parameterization scheme performing much better than the two-moment scheme. The simulations performed for this case confirm (as reported in previous studies) that for pure sedimentation, the three-moment parameterization schemes deliver a physically more complete representation of the evolution of droplet size distribution. The impact of the combined effect of sedimentation and collision-coalescence processes on DSD was also assessed. We could observe that certain differences arise between the parameterized scheme and the spectral model when the collision-coalescence process is incorporated, as the onset of precipitation occurs earlier in the three-moment parameterized scheme. It can be concluded that, in general, the three-moment warm rain bulk microphysics scheme is able to reproduce the results of the reference bin microphysical model.
Tema
cloud microphysics; method of moments; parameterizations
Idioma
eng
ISSN
ISSN electrónico: 2395-8812; ISSN impreso: 0187-6236
DOI
https://doi.org/10.20937/ATM.53181
