There have been growing concerns about mercury pollution in the global environment and better understanding of the source-receptor relationships for mercury deposition in the context of global change is greatly needed. We use a global 3-D chemical transport model (GEOS-Chem) to examine the source-receptor relationships between various regions as well as the impacts from changes in anthropogenic emissions, climate, land use and land cover. Through an extensive set of sensitivity simulations, we quantify the relative contributions from various sources (such as domestic vs. foreign anthropogenic sources; anthropogenic vs. natural sources) to total mercury deposition in specific receptor regions (East Asia, South Asia, Europe, North America, and the Laurentian Great Lakes). Under the 2050 A1B emission scenario (the higher emission scenario with fast economic growth and balanced emphasis on all energy sources), the relative contributions from anthropogenic emissions to total mercury deposition for each receptor region are calculated to increase in general, while the relative contributions from ocean and terrestrial sources are found to decrease. On the other hand, with the 2050 B1 emission scenario (the lower emission scenario with rapid introduction of clean energy and resource-efficient technologies), we find the changes in the relative contributions from anthropogenic emissions show different signs over different regions, reflecting the divergent trends in future anthropogenic emissions (notably, emissions increase in South Asia and decrease in East Asia). Compared to the impacts of anthropogenic emissions on the source-receptor relationships of mercury deposition, the impacts from changes in climate and land use/land cover are generally smaller in magnitudes but show stronger spatial variations.

人们越来越关注全球环境中的汞污染，因此迫切需要更好地了解全球变化背景下汞沉积的源-受体关系。我们使用全球3-D化学物质运输模型（GEOS-Chem）来检查各个地区之间的源-受体关系，以及人为排放，气候，土地利用和土地覆盖变化带来的影响。通过广泛的敏感性模拟，我们量化了各种来源（例如国内与国外的人为来源；人为与自然来源）对特定受体区域（东亚，南亚，欧洲，北部）中总汞沉积的相对贡献。美国和劳伦山脉的五大湖）。在2050年A1B排放情景下（较高的排放情景，经济快速增长，并且对所有能源的平衡重视），计算得出每个受体区域人为排放对总汞沉积的相对贡献总体上会增加，而来自发现海洋和陆地来源减少。另一方面，在2050年B1排放情景下（随着清洁能源和资源高效技术的快速采用，排放情景降低了），我们发现人为排放的相对贡献的变化在不同地区表现出不同的迹象，反映出不同的情况。未来人为排放的趋势（特别是南亚的排放增加而东亚的减少）。