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首页> 外文期刊>Atmosphere >Non-Monotonic Dependencies of Cloud Microphysics and Precipitation on Aerosol Loading in Deep Convective Clouds: A Case Study Using the WRF Model with Bin Microphysics
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Non-Monotonic Dependencies of Cloud Microphysics and Precipitation on Aerosol Loading in Deep Convective Clouds: A Case Study Using the WRF Model with Bin Microphysics

机译：深层对流云中云微观物理学的非单调依赖性和降水对气溶胶负荷的影响：以WRF模型与Bin微观物理学为例的案例研究

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摘要

Aerosol-cloud-precipitation interactions in deep convective clouds are investigated through numerical simulations of a heavy precipitation event over South Korea on 15–16 July 2017. The Weather Research and Forecasting model with a bin microphysics scheme is used, and various aerosol number concentrations in the range N 0 = 50–12,800 cm ?3 are considered. Precipitation amount changes non-monotonically with increasing aerosol loading, with a maximum near a moderate aerosol loading ( N 0 = 800 cm ?3 ). Up to this optimal value, an increase in aerosol number concentration results in a greater quantity of small droplets formed by nucleation, increasing the number of ice crystals. Ice crystals grow into snow particles through deposition and riming, leading to enhanced melting and precipitation. Beyond the optimal value, a greater aerosol loading enhances generation of ice crystals while the overall growth of ice hydrometeors through deposition stagnates. Subsequently, the riming rate decreases because of the smaller size of snow particles and supercooled drops, leading to a decrease in ice melting and a slight suppression of precipitation. As aerosol loading increases, cold pool and low-level convergence strengthen monotonically, but cloud development is more strongly affected by latent heating and convection within the system that is non-monotonically reinforced.
机译：通过对2017年7月15日至16日在韩国发生的强降水事件进行数值模拟，研究了深对流云中的气溶胶-云-降水相互作用。使用具有bin微观物理方案的天气研究和预报模型，并在其中使用了各种气溶胶浓度范围N 0 = 50–12,800 cm？3。降水量随气溶胶负荷的增加而非单调变化，最大值在中等气溶胶负荷（N 0 = 800 cm？3）附近。达到此最佳值，气溶胶数量浓度的增加会导致成核形成大量小液滴，从而增加冰晶的数量。冰晶通过沉积和边缘化形成雪粒，导致融化和沉淀增强。超过最佳值，更大的气溶胶负载量会增加冰晶的生成，而通过沉积物停滞使冰水凝结物整体生长。随后，由于雪粒和过冷液滴的尺寸变小，缘边率降低，从而导致冰融化的减少和降水的轻微抑制。随着气溶胶负荷的增加，冷池和低空辐合度会单调加强，但云的发展会受到非单调加强的系统内潜热和对流的强烈影响。

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