Dry deposition of atmospheric aerosols and its impacts to atmospheric environment

采用野外观测和模式模拟相结合的方法，研究了东亚地区大气气溶胶的干沉降过程，提出了一种基于松弛涡积（REA）方法的气溶胶干沉降通量测量新技术。利用该测量系统，对草原和雪场几种气象条件下大气气溶胶的干沉降速度进行了研究，并利用三种不同的化学输送模式进行了一系列的模式模拟（HYPACT，和CMAQ）与一个气象模式（RAMS）相结合，分析了东亚地区大气气溶胶的动力学特征。HYPACT模式能较好地再现硫、氮浓度和沉降量的时空分布。RAMS/HYPACT的源-受体关系分析表明，日本每年的硫和氮沉降分别有49%和34%来自中国。此外，利用RAMS/CMAQ模式系统对2020年东亚地区未来的酸沉降进行了预测。(1)通过进一步的观测验证气溶胶干沉降测量系统;（2）利用野外观测组的数据验证RAMS/CMAQ。

The dry deposition of atmospheric aerosols was investigated using field observation and model simulation in East Asia.A new experimental technique for measuring dry deposition flux of aerosol particles was developed based on the relaxed eddy accumulation (REA) method. Using this measurement system, the dry deposition velocity of atmospheric aerosols was investigated under the several meteorological conditions in the grassland and snow field.A series of model simulation using three types of chemical transport model (HYPACT, and CMAQ) coupled with a meteorological model (RAMS) has been conducted to analysis the dynamics of atmospheric aerosols in East Asia.RAMS/HYPACT could reproduce the temporal and spatial distributions of concentration and deposition for sulfur and nitrogen. Source-receptor relationships using by RAMS/HYPACT demonstrated that annual sulfur and nitrogen deposition in Japan was 49 % and 34 % from China, respectively. Additionally, the future acid deposition over East Asia in 2020 was predicted by the RAMS/CMAQ modeling system.We will continue our research in the following directions. (1) validate the aerosol dry deposition measurement system via further observations, (2) validate our RAMS/CMAQ using the dataset by field observation groups.