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Comparative study of elemental mercury flux measurement techniques over a Fennoscandian boreal peatland
S.Osterwalder;  J.Sommar;  S.Åkerblom;  G.Jocher;  J.Fritsche;  M.B.Nilsson;  K.Bishop;  C.Alewell
Source PublicationAtmospheric Environment

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 (R) 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, alpha = 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 m(2)) 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.

KeywordLand-atmosphere Exchange Dynamic Flux Chamber Micrometeorology Relaxed Eddy Accumulation Elemental Mercury
Document Type期刊论文
Affiliation1.Department of Environmental Sciences, University of Basel, Basel, Switzerland
2.Department of Forest Ecology and Management, Swedish University of Agricultural Sciences, Umeå, Sweden
3.State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang, China
4.Department of Aquatic Sciences and Assessment, Swedish University of Agricultural Sciences, Uppsala, Sweden
5.Department of Earth Sciences, University of Uppsala, Uppsala, Sweden
Recommended Citation
GB/T 7714
S.Osterwalder;J.Sommar;S.Åkerblom;G.Jocher;J.Fritsche;M.B.Nilsson;K.Bishop;C.Alewell. Comparative study of elemental mercury flux measurement techniques over a Fennoscandian boreal peatland[J]. Atmospheric Environment,2018,172(1):16-25.
APA S.Osterwalder;J.Sommar;S.Åkerblom;G.Jocher;J.Fritsche;M.B.Nilsson;K.Bishop;C.Alewell.(2018).Comparative study of elemental mercury flux measurement techniques over a Fennoscandian boreal peatland.Atmospheric Environment,172(1),16-25.
MLA S.Osterwalder;J.Sommar;S.Åkerblom;G.Jocher;J.Fritsche;M.B.Nilsson;K.Bishop;C.Alewell."Comparative study of elemental mercury flux measurement techniques over a Fennoscandian boreal peatland".Atmospheric Environment 172.1(2018):16-25.
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