论文标题
通过增加湿度的气溶胶对对流的气溶胶启动
Aerosol invigoration of atmospheric convection through increases in humidity
论文作者
论文摘要
云 - 大赛相互作用仍然是了解气候和恶劣天气的主要障碍。观察结果表明，气溶胶增强了热带雷暴活性。过去的研究是在理解气溶胶对云的影响的重要性的推动下，提出了几种可以解释观察到链接的机制。在这里，我们表明高分辨率大气模拟可以再现气溶胶与对流之间观察到的联系。但是，我们还表明，以前提出的机制无法解释功能。检查基础过程表明，在我们的模拟中，高气溶胶浓度通过产生将更多凝结水混合到周围空气中的云来增加环境湿度。反过来，较高的湿度有利于大规模上升和更强的对流。我们的结果提供了一个物理原因，可以期望在热带地区的高音溶胶区域中充满活力的雷暴。
Cloud-aerosol interactions remain a major obstacle to understanding climate and severe weather. Observations suggest that aerosols enhance tropical thunderstorm activity; past research, motivated by the importance of understanding aerosol impacts on clouds, has proposed several mechanisms that could explain that observed link. Here, we show that high-resolution atmospheric simulations can reproduce the observed link between aerosols and convection. However, we also show that previously proposed mechanisms are unable to explain the invigoration. Examining underlying processes reveals that, in our simulations, high aerosol concentrations increase environmental humidity by producing clouds that mix more condensed water into the surrounding air. In turn, higher humidity favors large-scale ascent and stronger convection. Our results provide a physical reason to expect invigorated thunderstorms in high-aerosol regions of the tropics.
