DOI: 10.1016/j.atmosenv.2017.10.025
Scopus记录号: 2-s2.0-85032341503
论文题名: Comparative study of elemental mercury flux measurement techniques over a Fennoscandian boreal peatland
作者: Osterwalder S ; , Sommar J ; , Åkerblom S ; , Jocher G ; , Fritsche J ; , Nilsson M ; B ; , Bishop K ; , Alewell C
刊名: Atmospheric Environment
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2018
卷: 172 起始页码: 16
结束页码: 25
语种: 英语
英文关键词: Dynamic flux chamber
; Elemental mercury
; Land-atmosphere exchange
; Micrometeorology
; Relaxed eddy accumulation
Scopus关键词: Atmospheric turbulence
; Groundwater
; Meteorology
; Peat
; Polytetrafluoroethylenes
; Wetlands
; Coefficients of variations
; Dynamic flux chamber
; Elemental mercury
; Elemental mercury fluxes
; Gaseous elemental mercury
; Micrometeorology
; Relaxed Eddy accumulation
; Relaxed eddy accumulations
; Mercury (metal)
; gaseous elemental mercury
; mercury
; peat
; unclassified drug
; comparative study
; dissolution
; flux chamber
; flux measurement
; gas exchange
; heterogeneity
; large eddy simulation
; measurement method
; micrometeorology
; peatland
; quantitative analysis
; spatiotemporal analysis
; air temperature
; ambient air
; Article
; biome
; boundary layer
; comparative study
; controlled study
; elemental mercury flux measurement
; fennoscandian boreal peatland
; gas analysis
; gas exchange
; humidity
; limit of detection
; nonhuman
; peatland
; priority journal
; soil temperature
; surface soil
; turnover time
; vascular plant
; water table
; Tracheophyta
Scopus学科分类: Environmental Science: Water Science and Technology
; Earth and Planetary Sciences: Earth-Surface Processes
; Environmental Science: Environmental Chemistry
英文摘要: Quantitative estimates of the land-atmosphere exchange of gaseous elemental mercury (GEM) are biased by the measurement technique employed, because no standard method or scale in space and time are agreed upon. Here we present concurrent GEM exchange measurements over a boreal peatland using a novel relaxed eddy accumulation (REA) system, a rectangular Teflon® dynamic flux chamber (DFC) and a DFC designed according to aerodynamic considerations (Aero-DFC). During four consecutive days the DFCs were placed alternately on two measurement plots in every cardinal direction around the REA sampling mast. Spatial heterogeneity in peat surface characteristics (0–34 cm) was identified by measuring total mercury in eight peat cores (57 ± 8 ng g−1, average ± SE), vascular plant coverage (32–52%), water table level (4.5–14.1 cm) and dissolved gaseous elemental mercury concentrations (28–51 pg L−1) in the peat water. The GEM fluxes measured by the DFCs showed a distinct diel pattern, but no spatial difference in the average fluxes was detected (ANOVA, α = 0.05). Even though the correlation between the Teflon® DFC and Aero-DFC was significant (r = 0.76, p < 0.05) the cumulative flux of the Aero-DFC was a factor of three larger. The average flux of the Aero-DFC (1.9 ng m−2 h−1) and REA (2 ng m−2 h−1) were in good agreement. The results indicate that the novel REA design is in agreement for cumulative flux estimates with the Aero-DFC, which incorporates the effect of atmospheric turbulence. The comparison was performed over a fetch with spatially rather homogenous GEM flux dynamics under fairly consistent weather conditions, minimizing the effect of weather influence on the data from the three measurement systems. However, in complex biomes with heterogeneous surface characteristics where there can be large spatial variability in GEM gas exchange, the small footprint of chambers (<0.2 m2) makes for large coefficients of variation. Thus many chamber measurement replications are needed to establish a credible biome GEM flux estimate, even for a single point in time. Dynamic flux chambers will, however, be able to resolve systematic differences between small scale features, such as experimentally manipulated plots or small scale spatial heterogeneity. © 2017 The Authors Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/83113
Appears in Collections: 气候变化事实与影响
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作者单位: Department of Environmental Sciences, University of Basel, Basel, Switzerland; Department of Forest Ecology and Management, Swedish University of Agricultural Sciences, Umeå, Sweden; State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang, China; Department of Aquatic Sciences and Assessment, Swedish University of Agricultural Sciences, Uppsala, Sweden; Department of Earth Sciences, University of Uppsala, Uppsala, Sweden
Recommended Citation:
Osterwalder S,, Sommar J,, Åkerblom S,et al. Comparative study of elemental mercury flux measurement techniques over a Fennoscandian boreal peatland[J]. Atmospheric Environment,2018-01-01,172