Examination of Aerosol-Induced Convective Invigoration Using Idealized Simulations
Examination of Aerosol-Induced Convective Invigoration Using Idealized Simulations
复制标题
使用理想化模拟检查气溶胶引起的对流增强
DOI：
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发表时间：
2020
期刊：
影响因子：
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通讯作者：
R. Walko
中科院分区：
文献类型：
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作者：
W. Cotton;R. Walko
理想化的大涡模拟（LES）进行的深对流云在南佛罗里达检查的相对作用气溶胶引起的凝结与混合相的增强对流强度和降雨。气溶胶浓度和化学性质是通过使用GEOS-Chem全球大气化学模型的输出来表示的，该模型在有和没有人为气溶胶源的情况下运行。结果清楚地表明，较高的气溶胶浓度会导致降水增强、云液态水含量增加、模拟后期上升气流速度增强以及凝结潜热适度增强。总的来说，我们的结果是一致的概念，对流云的活跃主要是由于凝结活跃，而不是主要的混合相活跃。此外，我们的研究结果表明，凝结活跃可以导致普通的温暖的对流云，如常见的地点，如南佛罗里达明显的降水增强。
Idealized large-eddy simulations (LESs) are performed of deep convective clouds over south Florida to examine the relative role of aerosol-induced condensational versus mixed-phase invigoration to convective intensity and rainfall. Aerosol concentrations and chemistry are represented by using output from the GEOS-Chem global atmospheric chemistry model run with and without anthropogenic aerosol sources. The results clearly show that higher aerosol concentrations result in enhanced precipitation, larger amounts of cloud liquid water content, enhanced updraft velocities during the latter part of the simulation, and a modest enhancement of the latent heating of condensation. Overall, our results are consistent with the concept that convective cloud invigoration is mainly due to condensational invigoration and not primarily to mixed-phase invigoration. Furthermore, our results suggest that condensational invigoration can result in appreciable precipitation enhancement of ordinary warm-based convective clouds such as are common in locations like south Florida.