Trend,seasonal and multivariate analysis study of total gaseous mercury data from the Canadian atmospheric mercury measurement network (CAMNet) |
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| Institution: | 1. Environment Canada, Science and Technology Branch, 4905 Dufferin Street, Toronto, Ont., Canada, M3H 5T4;2. GKSS Research Centre Geesthacht, Institute for Coastal Research, Max-Planck-Str.1, D-21502 Geesthacht, Germany;3. Environment Canada, Meteorological Service of Canada, 45 Alderney Drive, Dartmouth, NS, Canada B2Y 2N6;4. Environment Canada, Science and Technology Branch, 105 rue McGill, Montréal, Qué., Canada H2Y 2E7;5. Environment Canada, Prairie and Northern Region, 4999-98 Ave., Edmonton, AB, Canada T6B 2X3;1. Environmental Chemistry Section, National Institute for Minamata Disease, 4058-18, Hama, Minamata-shi, Kumamoto 867-0008, Japan;2. Faculty of Science, Fukuoka University, 8-19-1 Nanakuma, Jonan-ku, Fukuoka-shi, Fukuoka 814-0180, Japan;3. Center of Regional Environmental Research, National Institute for Environmental Studies, 16-2, Onogawa, Tsukuba-shi, Ibaragi 305-8506, Japan;1. Department of Geological and Mining Engineering and Sciences, Michigan Technological University, Houghton, MI, USA;2. Department of Civil and Environmental Engineering, Michigan Technological University, Houghton, MI, USA;3. School of Environment and Energy, Peking University Shenzhen Graduate School, Shenzhen, China;4. Now at Department of Climate and Space Sciences and Engineering, University of Michigan, Ann Arbor, MI 48109, USA;5. School of Environmental Science and Engineering, Nanjing University of Information Science & Technology, Nanjing, China;6. ARVE Research SARL, Pully, Switzerland;1. Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, 100085, China;2. University of Chinese Academy of Sciences, Beijing, 100049, China;1. Institute of Mineralogy and Geochemistry, Karlsruhe Institute of Technology, Karlsruhe 76131, Germany;2. Université de Bordeaux, UMR 5805 EPOC, 33615 Pessac Cedex, France;3. Institute of Urban & Regional Atmospheric Environmental Research, Chinese Research Academy of Environmental Sciences, Beijing 100012, China;4. Department of Earth Sciences and Resources, China University of Geosciences (CUG), Beijing 100083, China;1. Key Lab of Urban Environment and Health, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, PR China;2. University of Chinese Academy of Sciences, Beijing 100086, PR China;3. National University of Singapore, 117548 Singapore, Singapore |
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| Abstract: | Long-term monitoring data of total gaseous mercury (TGM) concentrations from the Canadian Atmospheric Mercury Measurement Network (CAMNet) were analysed for temporal trends, seasonality and comparability within the network and compared to other network and model results. Data collected from 11 Canadian measurement sites between 1995 and 2005 were analysed. Sites within CAMNet were characterized by principle component analysis (PCA) into four main categories. For the first time since automated TGM measurements have been made within CAMNet, this paper reveals statistically significant decreasing TGM concentrations from rural locations in Canada during this time period. The largest declines were observed close to the urban areas of Toronto and Montreal, where levels fell by 17% at Point Petre, and 13% at St. Anicet, respectively. Many of the TGM changes are comparable with the overall trends observed in total mercury concentrations in precipitation, for similar time periods, at co-located or nearby National Atmospheric Deposition programme's Mercury Deposition Network (NADP-MDN) sites. The results show that these changes are mostly driven by local or regional changes in mercury emissions. Other sites within CAMNet reflect reported changes in hemispherical global background concentrations of airborne mercury, where slight decreases or no statistically significant trend in TGM concentrations exist over the same time period. |
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