中国北方沙尘气溶胶对云和降水影响的数值模拟研究

已有的研究表明中国北方千旱半干旱地区是对流层沙尘气溶胶的主要来源之一,对当地乃至全球气候都有重要的意义.利用数值模拟研究方法探讨不同干燥程度的大气背景环境下,沙尘气溶胶数浓度对混合云形成和发展的可能影响,并采用析因试验讨论了主次影响因素.结果表明:沙尘气溶胶的增加导致降水减少、延长了云在空中存在的时间,改变了云的空间结构和微观结构.析因分析表明干旱半干旱气候背景条件下,混合云的累计降水量对沙尘气溶胶数浓度变化的敏感性要高于对大气环境湿度的敏感性;沙尘气溶胶数浓度增加导致云累计降水量的减少;沙尘气溶胶数浓度和大气环境湿度对云的累计降水量的影响是复杂的,研究结果可以用于指导降水预报业务.

A Numerical Study of Effects of Mineral Dust Particles on Cloud and Precipitation in the Northwest China

Previous studies show that the arid and semi-arid regions of North China serve as one of the principal sources of tropospheric dusts.The possible impacts of the aerosol concentration upon the formation and development of mixed clouds in the condition of different dry atmosphere was discussed based on the modeling simulation.The factorial analysis method was used to identify impacts of the major and minor factors.The evidence suggests that(1) increase in sand aerosols would lead to reducing precipitation,sup...