On the Parameterization of Evaporation of Raindrops as Simulated by a One-Dimensional Rainshaft Model | Zendy

Axel Seifert | Zendy

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On the Parameterization of Evaporation of Raindrops as Simulated by a One-Dimensional Rainshaft Model

Author(s) -

Axel Seifert

Publication year - 2008

Publication title -

journal of the atmospheric sciences

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.853

H-Index - 173

eISSN - 1520-0469

pISSN - 0022-4928

DOI - 10.1175/2008jas2586.1

Subject(s) - bin , evaporation , moment (physics) , parameterized complexity , range (aeronautics) , meteorology , environmental science , cloud physics , cloud base , statistical physics , atmospheric sciences , function (biology) , physics , mathematics , cloud computing , materials science , classical mechanics , computer science , algorithm , composite material , operating system , evolutionary biology , biology

The process of evaporation of raindrops below cloud base is investigated by numerical simulations using a one-dimensional rainshaft model with bin microphysics. The simulations reveal a high variability of the shape of the raindrop size distributions, which has important implications for the efficiency of evaporation below cloud base. A new parameterization of the shape of the raindrop size distribution as a function of the mean volume diameter is suggested and applied in a two-moment microphysical scheme. In addition, the effect of evaporation on the number concentration of raindrops is parameterized. A comparison of results of the revised two-moment scheme and the bin microphysics rainshaft model shows that the two-moment scheme is able to reproduce the results of the reference model in a wide parameter range.

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