自由对流层大气汞的形态转化及传输规律研究

项目名称： 自由对流层大气汞的形态转化及传输规律研究

项目编号： No.41475115

项目类型： 面上项目

立项/批准年度： 2015

项目学科： 天文学、地球科学

项目作者： 王艳

作者单位： 山东大学

项目金额： 86万元

中文摘要： 为研究大气汞在自由对流层的污染特征及传输规律，本研究拟选择高山站-泰山，对大气汞、氧化性气体、痕量气体、颗粒物以及云雾水进行综合化学观测，结合大气物理参数和气象卫星资料，研究不同形态大气汞在大气边界层上下的分布特征和变化规律，分析影响自由对流层大气汞形态转化的关键因素，研究云雾过程中大气汞的迁移转化规律，探究云雾水中汞的液相氧化还原机制和汞的甲基化途径。运用拉格朗日后向轨迹及粒子扩散模式和源解析技术，阐明大气汞的潜在源区和传输路径，并通过对大气垂直结构的模拟，研究大气汞在边界层和自由对流层之间的传输规律。本项目的实施，将为研究我国大气汞的区域污染特征及多尺度输送提供基础数据，对揭示汞的全球大气循环过程具有一定的科学意义。

中文关键词： 自由对流层；大气汞；形态转化；大气传输；云雾

英文摘要： This proposed work aims to investigate the spatial and temporal distributions of atmospheric speciated mercury (Hg) and its chemical transformation and transport in a high elevation, background location in China . Distributions of speciated mercury will be characterized using measurements data at urban and mountain monitoring sites. Concurrent measurements of oxidizing gases, particulate matters and cloud water will be employed to understand chemical transformation of speciated mercury.Advanced near real-time measurement instrument and cloud sampling techniques will be used to obtain key measurement data. Complemented by the analysis of atmospheric physical parameters and meteorological satellite data, crucial factors influencing atmospheric mercury transformation and transport within the free troposphere will be diagnosed. Migration and transformation (e.g., redox and methylation) mechanisms of speciated atmospheric mercury in cloud processes will be a focus of this proposed investigation. With the application of a Lagrangian dispersion model Hybrid Single-Particle Lagrangian Integrated Trajectory as well as source apportionment techniques, potential source regions and transport pathways of atmospheric mercury will be identified.This project will provide critical field measurement data and in-depth understanding of mechanisms controlling chemical transformation of speciated mercury and multi-scaled transport processes in the free troposphere. Results from this work will contribute to advancement of our understanding of mercury cycling.

英文关键词： free troposphere;mercury;speciation transformation;atmospheric transport;cloud and fog