Development and evaluation of a bulk three-moment parameterization scheme incorporating the processes of sedimentation and collision-coalescence

IF 1 4区 地球科学 Q4 METEOROLOGY & ATMOSPHERIC SCIENCES Atmosfera Pub Date : 2023-08-01 DOI:10.20937/atm.53181
Lainer Felipe Donet Vasconcellos, Lester Augusto Alfonso Diaz
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Abstract

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.
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包含沉降和碰撞合并过程的体积三矩参数化方案的发展和评价
有几个三矩方案考虑了除沉积作用外的其他过程。因此,由于沉积和其他微物理过程的综合影响,对这些类型的方案进行性能评估是一个令人感兴趣的问题。在本研究中,开发了一个暖雨体三矩参数化方案,并通过与bin微物理方案的详细比较进行了评估。为了评价沉降作用以及沉降与碰撞聚并作用对水滴粒径分布的影响,采用不同形状参数初始值的雨轴模型对水滴粒径分布进行了模拟。对于纯沉降,三矩方案与显式模型之间具有良好的对应关系,对于较大的伽玛分布初始形状参数,其体积量几乎完全重合,总体而言,三矩参数化方案的性能远好于两矩方案。在这种情况下进行的模拟证实(如以前的研究报告),对于纯沉积,三矩参数化方案提供了一个物理上更完整的液滴尺寸分布演变的表示。并对沉降和碰撞聚结过程对DSD的综合影响进行了评价。我们可以观察到,当考虑碰撞-合并过程时,参数化方案与光谱模型之间存在一定的差异,因为三矩参数化方案的降水开始时间更早。总的来说,三时刻暖雨体微物理方案能够再现参考bin微物理模型的结果。
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来源期刊
Atmosfera
Atmosfera 地学-气象与大气科学
CiteScore
2.20
自引率
0.00%
发文量
46
审稿时长
6 months
期刊介绍: ATMÓSFERA seeks contributions on theoretical, basic, empirical and applied research in all the areas of atmospheric sciences, with emphasis on meteorology, climatology, aeronomy, physics, chemistry, and aerobiology. Interdisciplinary contributions are also accepted; especially those related with oceanography, hydrology, climate variability and change, ecology, forestry, glaciology, agriculture, environmental pollution, and other topics related to economy and society as they are affected by atmospheric hazards.
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