Aerosol Impacts on Thermally Driven Orographic Convection
Aerosol Impacts on Thermally Driven Orographic Convection
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DOI：
10.1175/jas-d-15-0320.1
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发表时间：
2016-07
影响因子：
3.1
通讯作者：
A. Nugent;C. Watson;G. Thompson;Ronald B. Smith
中科院分区：
文献类型：
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作者：
A. Nugent;C. Watson;G. Thompson;Ronald B. Smith
多米尼克实验（DOMEX）的野外观测清楚地表明，气溶胶对热驱动地形云的云微物理特性有影响。假设当对流受到岛屿表面加热的强迫时，大部分森林覆盖的岛屿表面的气溶胶上升到云中，导致观测到高浓度的气溶胶和高浓度的小云滴。然而，当试图了解这些表面气溶胶对降水的影响时，观测到的云层湿度的差异增加了复杂性。采用具有气溶胶感知的Thompson微物理方案的WRF模式研究了热驱动岛屿对流的六种理想情景：有和没有地面气溶胶源、有相对干燥的云层和有潮湿的云层、无风和弱背景风。研究发现，至少需要一个弱背景风才能确保与多米尼加有关的结果，并且……
AbstractObservations from the Dominica Experiment (DOMEX) field campaign clearly show aerosols having an impact on cloud microphysical properties in thermally driven orographic clouds. It is hypothesized that when convection is forced by island surface heating, aerosols from the mostly forested island surface are lofted into the clouds, resulting in the observed high concentration of aerosols and the high concentration of small cloud droplets. When trying to understand the impact of these surface-based aerosols on precipitation, however, observed differences in cloud-layer moisture add to the complexity. The WRF Model with the aerosol-aware Thompson microphysics scheme is used to study six idealized scenarios of thermally driven island convection: with and without a surface aerosol source, with a relatively dry cloud layer and with a moist cloud layer, and with no wind and with a weak background wind. It is found that at least a weak background wind is needed to ensure Dominica-relevant results and that t...