DOI: 10.1002/2014MS000367
Scopus记录号: 2-s2.0-85027923058
论文题名: An approach estimating bidirectional air-surface exchange for gaseous elemental mercury at AMNet sites
作者: Wright L ; P ; , Zhang L
刊名: Journal of Advances in Modeling Earth Systems
ISSN: 19422466
出版年: 2015
卷: 7, 期: 1 起始页码: 35
结束页码: 49
语种: 英语
英文关键词: Atmospheric chemistry
; Deposition
; Land use
; Meteorological problems
; Sun
; Air-surface exchanges
; Atmospheric depositions
; Atmospheric mercury
; Compensation points
; Dry deposition models
; Gaseous elemental mercury
; Meteorological condition
; National atmospheric deposition programs
; Mercury (metal)
; atmospheric pollution
; canopy
; concentration (composition)
; dry deposition
; emission
; estimation method
; mathematical analysis
; measurement method
; mercury (element)
; meteorology
; numerical model
; seasonal variation
; solar radiation
; temperature effect
; China
; Zhang Basin
英文摘要: The bidirectional air-surface exchange for gaseous elemental mercury (GEM) and existing measurements of the compensation points over a variety of canopy types are reviewed. Deposition and emission of GEM are dependent on several factors such as the type of canopy, temperature, season, atmospheric GEM concentrations, and meteorological conditions, with compensation points varying between 0.5 and 33 ng m-3. Emissions tend to increase from the spring to summer seasons, as the GEM accumulates in the foliage of the vegetation. A strong dependence on solar radiation has been observed, with higher emissions under light conditions. A bidirectional air-surface exchange flux model is proposed for estimating GEM fluxes at a two-hourly time resolution for the National Atmospheric Deposition Program's, Atmospheric Mercury Network (AMNet) sites. Compared to the unidirectional dry deposition model used in Zhang et al. (2012), two additional parameters, stomatal and soil emission potential, were needed in the bidirectional model and were chosen based on knowledge gained in the literature review and model sensitivity test results. Application of this bidirectional model to AMNet sites have produced annual net deposition fluxes comparable to those estimated in Zhang et al. (2012) at the majority of the sites. In this study, the net GEM dry deposition has been estimated separately for each dominant land use type surrounding each site, and this approach is also recommended for future calculations for easy application of the results to assessments of the mercury effects on various ecosystems. © 2014. The Authors. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/76006
Appears in Collections: 影响、适应和脆弱性 气候变化与战略
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作者单位: Stratford, PE, Canada; Air Quality Research Division, Science and Technology Branch, Environment Canada, Toronto, ON, Canada
Recommended Citation:
Wright L,P,, Zhang L. An approach estimating bidirectional air-surface exchange for gaseous elemental mercury at AMNet sites[J]. Journal of Advances in Modeling Earth Systems,2015-01-01,7(1)