中国地区沙尘气溶胶输送过程的数值模拟

THE STUDY ON THE TRANSPORT OF DUST AEROSOL IN CHINA

本文建立了一个包含沙尘起沙、输送、干沉积和湿沉积过程的气溶胶输送扩散模式 ,并和中尺度气候模式RIEMS相连接研究了 1998年 1月、4月、7月和 1997年 10月的沙尘起沙、输送、干沉积和湿沉积的过程。计算 1998年 1月、4月、7月和 1997年 10月气溶胶浓度及其分布 ,并和这四个月份的平均起沙分布以及北京、郑州和南京的实例沙尘分布作了比较 ,结果表明我国起沙多发生在春季 ,同时春季也是我国沙尘强度最大的季节。沙尘在我国西北的沙地和沙漠地区起沙后 ,向我国的东南方向输送 ,在输送过程中沙尘浓度逐渐降低。

In this paper, an aerosol model which includes emission,transportation,dry and wet deposition process was connected with Regional Climate model(RIEMS)to study the transport of dust aerosol in East Asia. The simulation was undertaken of dust mobilization and dust transportation in January,April,July,October by the model. The results showed that the mobilization occurred mostly in spring. After dust mobilization in the desert in Northwest of China, dust was forced to transport to Southeast. Dust concentration was reduced while transportation.