气候变化领域集成服务门户(CCPortal): Using Passive Air Samplers to Quantify Vertical Gaseous Elemental Mercury Concentration Gradients Within a Forest and Above Soil

CCPortal

DOI	10.1029/2021JD034981
	Using Passive Air Samplers to Quantify Vertical Gaseous Elemental Mercury Concentration Gradients Within a Forest and Above Soil
	Quant M.I.; Feigis M.; Mistry S.; Lei Y.D.; Mitchell C.P.J.; Staebler R.; Di Guardo A.; Terzaghi E.; Wania F.
发表日期	2021
ISSN	2169-897X
卷号	126 期号:15
英文摘要	Gaseous elemental mercury (GEM), the primary form of mercury (Hg) in the atmosphere, can undergo bidirectional exchange with the Earth's surface, with uptake in growing vegetation constituting the dominant atmospheric deposition process. Whereas direction and magnitude of this exchange can be determined using micrometeorological and chamber techniques, these approaches are complex, costly and labor-intensive, and often only yield fluxes over relatively short time-scales at few sites. We demonstrate that an inexpensive and easy-to-use passive air sampler can identify and quantify vertical GEM concentration gradients on scales ranging from centimeters to tens of meters over long time periods (up to 1.5 years) and with coarse temporal resolution (monthly to seasonally). Samplers were deployed above clean and contaminated soil and through a deciduous forest canopy at two sites in Southern Ontario. Significant and seasonally variable gradients of GEM concentrations, both increasing and decreasing with height above ground, were observed and can be explained through the influence of factors such as soil contamination, canopy growth, temperature, solar irradiance, and snow cover. At a minimum, the sampler can identify the GEM flux direction, but, when combined with the Modified Bowen Ratio method, can also be used to estimate the evaporative GEM flux from mercury-contaminated soil. We further demonstrate the application of the approach to contaminated site assessment, using a field in Brescia, Italy, known to contain elevated levels of Hg in soil. By allowing for cost-effective measurements at multiple sites and over extended time periods, passive sampling complements existing techniques for studying atmosphere-surface exchange of GEM. © 2021. American Geophysical Union. All Rights Reserved.
英文关键词	atmosphere; flux; mercury; passive air sampler; vegetation uptake; vertical concentration gradient
来源期刊	Journal of Geophysical Research: Atmospheres
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/237098
作者单位	Department of Physical and Environmental Sciences, University of Toronto Scarborough, Toronto, ON, Canada; Department of Chemistry, University of Toronto Scarborough, Toronto, ON, Canada; Environment and Climate Change Canada, Toronto, ON, Canada; Department of Science and High Technology, Environmental Modelling Group, University of Insubria, Como, Italy
推荐引用方式 GB/T 7714	Quant M.I.,Feigis M.,Mistry S.,et al. Using Passive Air Samplers to Quantify Vertical Gaseous Elemental Mercury Concentration Gradients Within a Forest and Above Soil[J],2021,126(15).
APA	Quant M.I..,Feigis M..,Mistry S..,Lei Y.D..,Mitchell C.P.J..,...&Wania F..(2021).Using Passive Air Samplers to Quantify Vertical Gaseous Elemental Mercury Concentration Gradients Within a Forest and Above Soil.Journal of Geophysical Research: Atmospheres,126(15).
MLA	Quant M.I.,et al."Using Passive Air Samplers to Quantify Vertical Gaseous Elemental Mercury Concentration Gradients Within a Forest and Above Soil".Journal of Geophysical Research: Atmospheres 126.15(2021).