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Trend, seasonal and multivariate analysis study of total gaseous mercury data from the Canadian atmospheric mercury measurement network (CAMNet)
- Source :
- Atmospheric Environment. 41:5423-5441
- Publication Year :
- 2007
- Publisher :
- Elsevier BV, 2007.
-
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.
- Subjects :
- MERCURE
Atmospheric Science
Multivariate analysis
Meteorology
Air pollution
chemistry.chemical_element
Seasonality
Atmospheric sciences
medicine.disease
medicine.disease_cause
Mercury (element)
Trend analysis
chemistry
medicine
Environmental science
Precipitation
Air quality index
General Environmental Science
Subjects
Details
- ISSN :
- 13522310
- Volume :
- 41
- Database :
- OpenAIRE
- Journal :
- Atmospheric Environment
- Accession number :
- edsair.doi...........76a3bdc4568a29485487d0fd5663d602
- Full Text :
- https://doi.org/10.1016/j.atmosenv.2007.02.021