| 气溶胶直接效应对一次降水影响的机理分析 |
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| 引用本文： | 杨桃进,刘宇迪.气溶胶直接效应对一次降水影响的机理分析[J].热带气象学报,2017,33(5):762-773. |
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| 作者姓名： | 杨桃进 刘宇迪 |
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| 作者单位： | 国防科技大学气象海洋学院，江苏 南京 211101 |
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| 基金项目： | 国家自然科学基金41175089 |
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| 摘 要： | 利用完全在线耦合气溶胶-辐射-云-降水相互作用的WRF-Chem模式研究了气溶胶直接效应对2012年7月21日一次暴雨的影响。结果表明，WRF-Chem模式较好模拟了此次降水过程中气象场和化学场的变化；模式基本模拟出此次降水的发展过程和总降水量的空间分布特征，气溶胶直接效应不会改变整体降水强度和区域总降水量，但会改变区域内的降水分布形态。在污染地区吸收性气溶胶对太阳短波辐射的吸收使大气中层加热，增强了相应大气层之间的不稳定性，使垂直运动更加强盛，由此霰和雨水对云水的收集增强，可降水粒子增加，降水增强；相反，在污染地区的下风向动力过程则相对减弱，降水减少。气溶胶直接效应通过影响动力过程和微物理过程改变降水的分布
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| 关 键 词： | 气溶胶直接效应 降水 机理分析 WRF-Chem |
| 收稿时间： | 2016-04-23 |
MECHANISM ANALYSIS OF THE IMPACTS OF AEROSOL DIRECT EFFECTS ON A RAINSTORM |
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| Affiliation: | Institute of Meteorology and Oceanography, National Universty of Defense Technology, Nanjing 211101, China |
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| Abstract: | The aerosol-radiation-cloud-precipitation was fully coupled online using the WRF-Chem model to investigate the impacts of aerosol direct effects on a heavy rainstorm that occurred on 21 July 2012. The results show that the model could reasonably simulate the variation of meteorological and chemical condition in this rainstorm. The precipitation distribution pattern was changed due to aerosol direct effects while the intensity of rainfall and the regional accumulated precipitation remained the same. The middle atmosphere was heated due to the absorption of shortwave radiation by absorbing aerosols, which increased instability of the corresponding atmosphere layer. As a result, dynamic processes were enhanced and precipitable particles were greatly increased, which contributed to more precipitation. In the downwind of polluted areas, dynamic processes were weakened and thus less precipitation was caused. The aerosol direct effects would change the distribution of precipitation through their impacts on dynamical and microphysical processes |
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