大气降尘监测研究

大气粉尘降落是地球表层地—气系统物质交换的一种形式 ,降尘过程有重要的环境指征意义。在沙尘暴事件发生频繁、生态环境质量日益得到关注的今天 ,大气降尘的研究更为重要。目前国内外的降尘监测方法各异 ,根据降尘取样器内有无存水可将监测大致分为干法和湿法两种。据笔者的监测结果 ,干法取样量为湿法取样量的 76%。干法、湿法各模拟一定的自然降尘过程 ,但两者皆有缺陷。建议统一大气降尘取样器的材质和规格 ,标定取样周期 ,提高监测数据精度 ,并组成全球陆域和海域降尘监测网络。

The Research on the Aerolion Dust Deposition Monitoring

Aeolian dust deposition is one of the main processes for the exchange between atmosphere and earth-surface, which indicates important environmental information. But now the monitoring of Aeolian dust deposition is insufficient for relating research. Based on current monitoring procedure, the methods to measure dust deposition could be classified into tow: dry and wet way, according to different sampling medium. Compared on the monitor results carried on the flat roof of Yifu2# building in Peking university, sampling amount by dry way is 76% of the wet way. Any way by vessel, no matter dry or wet, could not simulate natural dust deposit completely. Therefore the data should be rectified grounding on the regional geography. Establishing the monitoring network for Aeolian dust deposition is discussed at the end of this paper.