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Potential Controls On Trends In Background Concentrations Of Hg? In The Northeastern | 18559
ISSN: 2157-7617
Journal of Earth Science & Climatic Change
Open Access
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An analysis of multi-year data sets suggested a decreasing trend of 3.8?0.9 ppqv yr
-1
in background levels of gaseous
elemental mercury (Hg?) at an elevated, rural site in New Hampshire, US. It is in close agreement with the declining
trends reported from Mace Head (3.1?1.1 ppqv yr
-1
), Cape Point South Africa (3.8?0.6 ppqv yr
-1
), and mid-latitude Canadian
sites (~2.6-3.9 ppqv yr
-1
). In comparison, an abrupt increase in the fall of 2006 at a coastal, rural site resulted in no trends
there. Further examination showed a decreasing trend in the anthropogenic component at both sites, which probably is the
mechanism that drove the decline in the background concentrations observed at various locations. However, near the surface,
abundant precipitation in senescence months followed by a lack of snow in the following winter may cause increased mercury
evasion from the surface, which may ultimately increase the atmospheric concentration of Hg?. This is a working hypothesis
for the abrupt increase in the background concentrations of Hg? at the coastal site
Biography
Huiting Mao completed her PhD in 1999 from the State University of New York at Albany. She is currently Associate Professor at the Department of Chemistry, State
University of New York College of Environmental Science and Forestry. Her research spans a wide range of topics in air quality and climate, including regional to
global mercury budgets. She has published over 60 papers in high impact journals
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