Global circulation of atmospheric mercury: a modelling study |
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| Institution: | 1. Meteorological Service of Canada, Environment Canada, 2121 Route Transcanadienne, Dorval, Que., Canada H9P 1J3;2. Newfoundland Weather Centre, Environment Canada, PO Box 370, Gander, Nfld., Canada A1V 1W7;1. University of South Carolina, Arnold School of Public Health, Department of Environmental Health Sciences, 921 Assembly Street, Room 401, Columbia, SC 29208, USA;2. United States Geological Survey, 345 Middlefield Rd, Menlo Park, CA 94025, USA;3. Brooks Rand Instruments, 4415 6th Ave NW, Seattle, WA 98107, USA;1. School of Environment and Natural Resources, Renmin University of China, Beijing, 100872, China;2. School of Environmental Science and Engineering, Tianjin University, Tianjin, 300072, China;3. Department of Environmental Health, College of Public Health, East Tennessee State University, Johnson City, TN, 37614, USA;4. MOE Laboratory of Earth Surface Processes, College of Urban and Environmental Sciences, Peking University, Beijing 100871, China;1. State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, PR China;2. College of Resources Environment, Southwest University, Chongqing 400716, PR China;3. Soil and Earth Sciences, Institute of Agriculture and Environment, Massey University, Palmerston North, New Zealand |
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| Abstract: | This paper presents a comprehensive atmospheric global and regional mercury model and its capability in describing the atmospheric cycling of mercury. This is an on-line model (integrated within the Canadian operational environmental forecasting and data assimilation system) which can be used to understand the role of meteorology in mercury cycling (atmospheric pathways), the inter-annual variability of mercury and can be evaluated against observations on global scales. This is due to the fact that the model uses a combination of actual observed and predicted meteorological state of the atmosphere at high resolution to integrate the model as opposed to the climatological approach used in existing global mercury models. The model was integrated and evaluated on global scale using only anthropogenic emissions. North to south gradients in mercury concentrations, seasonal variability, dry and wet deposition and vertical structure are well simulated by the model. The model was used to explain the observed seasonal variations in atmospheric mercury circulation. The results from this study include a global animation of surface air concentrations of total gaseous mercury for 1997. |
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