汾渭平原首次被纳入大气污染防治重点区域之一，对该地区气溶胶传输研究非常必要和紧迫。作为平流层和对流层交换示踪剂，10Be/7Be可予之新的研究视角。高效、准确地获得放射性核素10Be与7Be数据是本项目拟解决的最关键的科学和技术问题。长期以来，10Be完全依赖于AMS分析；而7Be主要是γ射线能谱法。但7Be-AMS方法更灵敏且高效，更重要的是可经一次制样、同方法在线分析，为很多同时关注10Be与7Be的研究提供便利方案。本项目拟建立适合AMS同靶样分析的化学流程；以3MV AMS结合二次剥离降能膜技术，首次利用非全剥离价态的Be离子，实现可普遍适用于小型/紧凑型AMS的7Be测量方法；并系统研究10Be与7Be同靶样下的AMS分析与校正方案；并以此获得汾渭平原上重点城市与本底点的气溶胶、干/湿沉降样品数据；同时拟结合所得观测数据与模式模拟，开展该地区气溶胶传输过程及初步的动力学机制研究。

Fen-Wei Plain was included in one of the key areas for air pollution control in China. Study of aerosol transport is very necessary and urgent in this area. As a stratosphere-troposphere exchange tracer, 10Be/7Be can give new perspectives. Therefore, an accurate, sensitive, convenient and rapid measurement technique for 10Be and 7Be is the key scientific and technical problems to be solved in this project. 10Be analyses rely instead on accelerator mass spectrometry (AMS). The most widely used technique for 7Be analyses is γ-ray counting. However, AMS also offers advantages for the measurement of 7Be, with inherently higher efficiency and sensitivity, as compared to γ-ray counting. It is important that this method could be for both 7Be and 10Be to be determined by AMS, from the same target and at the same time, which provides a convenient solution for many research fields that focus both on 10Be and 7Be. In this project, the preparation procedures of various samples that is suitable for 10Be and 7Be by AMS measurement at same target will be established. The more efficient and universal 7Be-AMS analysis is to be carried out using non-full electron stripping valence state (i.e. BeO-→Be2+→Be3+) at 3MV AMS system with secondary foil stripper, for the first time. And the method of measuring and calibrating 10Be and 7Be by AMS at same target will be systematically studied. Finally, the aerosol and dry/wet deposition samples data of key cities and background area in Fen-Wei Plain will be obtained using our method. Meanwhile, the combined observation data and model simulations, the aerosol transport processes and dynamical mechanisms will be preliminary studied in this area.