School of the Environment and State Key Laboratory of Pollution Control and Resource Reuse, Nanjing University, 163 Xianlin Avenue, Nanjing, 210023, Jiangsu, China.
Jiangsu Collaborative Innovation Center of Atmospheric Environment and Equipment Technology (CICAEET), Nanjing University of Information Science and Technology, Nanjing, 210044, Jiangsu, China.
Bull Environ Contam Toxicol. 2022 Dec 16;110(1):16. doi: 10.1007/s00128-022-03641-0.
This study reviewed the existing framework of dry deposition schemes for speciated atmospheric mercury. As the most commonly used methods for mercury dry deposition estimation, the big-leaf resistance scheme for gaseous oxidized mercury (GOM), the size distribution regarded resistance scheme for particulate bound mercury (PBM), and the bidirectional air-surface exchange scheme for gaseous elemental mercury (GEM) were introduced in detail. Sensitivity analysis were conducted to quantitatively identify the key parameters for the estimation of speciated mercury dry deposition velocities. The dry deposition velocity of GOM was found to be sensitive to the wind speed and some land use related parameters. The chemical forms of GOM could have a significant impact on the dry deposition velocity. The dry deposition velocity of PBM is sensitive to the mass fraction of PBM in coarse particles, while that of GEM is most sensitive to air temperature. Future research needs were proposed accordingly.
本研究回顾了现有的大气汞形态干沉降方案框架。作为汞干沉降估算最常用的方法，气态氧化态汞（GOM）的大叶片阻力方案、颗粒结合态汞（PBM）的粒径分布阻力方案以及气态元素态汞（GEM）的双向气-固交换方案都被详细介绍。通过敏感性分析，定量确定了估算形态汞干沉降速率的关键参数。GOM 的干沉降速率对风速和一些与土地利用相关的参数敏感。GOM 的化学形态对干沉降速率有显著影响。PBM 的干沉降速率对粗颗粒中 PBM 的质量分数敏感，而 GEM 的干沉降速率对空气温度最敏感。相应地提出了未来的研究需求。
