Atmospheric deposition of sulfur and inorganic nitrogen in the Southern Canadian Rocky Mountains from seasonal snowpacks and bulk summer precipitation

Wasiuta, Vivian; Lafrenière, Melissa J.; Norman, Ann‐Lise

doi:10.1016/j.jhydrol.2015.01.073

Cited by 11 publications

(12 citation statements)

References 42 publications

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“…Sulfate deposited in the seasonal snowpack at the upper Haig Valley site, HG2770, is reasonably representative of deposition in the six valleys (nine snowpits) sampled in the 2008/2009 regional study. Snowpack deposition at HG2770 (0.47 kg S ha −1 ) and the total snowpack δ 34 S‐SO 4 2− values (+4.7‰) were the same as the mean snowpack values for S deposition (0.47 ± 0.08 kg S ha −1 ) (Figure b) [ Wasiuta et al, ] and δ 34 S‐SO 4 2− (+4.8 ± 0.6‰) (Figure c) from the nine sites sampled in 2009.…”

Section: Resultsmentioning

confidence: 99%

“…Sample sites are arranged from south to north for the Haig Glacier (HG2500, HG2670, and HG2770), Robertson Glacier (RB2800 and RB2500), Opabin Glacier (OP2400), Wapta Icefield (WP2670), Athabasca Glacier (AT2820), and ~100 km to the west the Illecillewaet Glacier (IC2490). Bars indicate measurement error for IC analyses and SWE [ Wasiuta et al, ] and the standard deviation of laboratory standards for δ 34 S‐SO 4 2− .…”

Section: Resultsmentioning

confidence: 99%

“…The patterns of S deposition and δ 34 S‐SO 4 2− values demonstrate that SO 4 2− deposited at the upper Haig Valley site is a valid representation of background atmospheric S in midlatitude Western Canada. A regional study of snowpack S deposition [ Wasiuta et al, ] along with δ 34 S‐SO 4 2− values from this study indicates that S deposited at the upper Haig Valley site and other high alpine sites in the study area was mainly from distant sources with little impact from local to regional pollution during the snow accumulation season (September or October through to April or May). Even in the summer when increased convective mixing in the troposphere and expanded depth of atmospheric boundary layer improve the likelihood of increased transport and deposition of local and regional emissions into the alpine, S deposition and δ 34 S‐SO 4 2− values in the upper Haig Valley indicate S from long‐range transport [ Wasiuta et al, ].…”

Section: Discussionmentioning

confidence: 99%

“…Anion and cation concentrations were determined simultaneously using a Dionex ICS‐3000 system in the Department of Geography, Queen's University [ Wasiuta et al, ]. Samples were processed for δ 34 S‐SO 4 2− and δ 18 O‐SO 4 2− analysis at the University of Calgary Isotope Science Laboratory (ISL) and prepared for analysis as barium sulfate (BaSO 4 ) precipitated from concentrated samples [see Wasiuta et al, ].…”

Section: Methodsmentioning

confidence: 99%

“…Anion and cation concentrations were determined simultaneously using a Dionex ICS-3000 system in the Department of Geography, Queen's University [Wasiuta et al, 2015a]…”

Section: Laboratory Methodsmentioning

confidence: 99%

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Background atmospheric sulfate deposition at a remote alpine site in the Southern Canadian Rocky Mountains

et al. 2015

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We report observations of stable isotope ratios and ion concentrations from seasonal snowpack and summer bulk precipitation from remote alpine sites in the Southern Canadian Rocky Mountains. Spatial deposition patterns for sulfur (S) and δ34S‐SO42− values indicate dominantly distant sources with little impact from local to regional pollution. Comparable S loads and total snowpack δ34S‐SO42− values for glacier snowpack indicates S emissions were well mixed prior to dry deposition or incorporation into snowfall. A uniform S load and similar δ34S‐SO42− values in a detailed study of summer bulk precipitation implies well‐mixed distant emissions. We interpret the deposited 0.9 kg S ha−1yr−1 as atmospheric background deposition in midlatitude Western Canada. This study will improve calculations for sites impacted by point source emissions and provide a baseline for attributing changes associated with climate change, industrialization, and urban growth. Field evidence from this study supports theoretical and laboratory research on the relative importance of oxidation pathways on atmospheric δ34S‐SO42− values for long‐range transported sulfate. δ34S‐SO42− of the dominant S source in summer bulk precipitation (~ +2‰) versus snowpack (≥ +9‰) cannot be explained by seasonal emission sources, temperature effects on fractionation, or Rayleigh distillation. The study supports a seasonal difference in the relative importance of the different SO2 to SO42− oxidation pathways with homogeneous oxidation by OH and heterogeneous oxidation by H2O2 most important in summer, and O2 catalyzed by transition metal ions in a radical chain reaction pathway more significant in winter.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

“…Anion and cation concentrations were determined simultaneously using a Dionex ICS-3000 system in the Department of Geography, Queen's University [Wasiuta et al, 2015a]…”

Section: Laboratory Methodsmentioning

confidence: 99%

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Background atmospheric sulfate deposition at a remote alpine site in the Southern Canadian Rocky Mountains

et al. 2015

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Evaluation of the Dry Deposition of Particles Emitted by Biomass Combustion

et al. 2023

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The dry deposition flux of particles smaller than 2.5 µm was investigated considering agricultural and urban regions. The concentrations, size distributions, and chemical characterization of particulate matter (PM) were evaluated and related to emission sources. The concentrations of fine PM were associated to the highest number of wildfire outbreaks. The results of the PM samples combined with the analyses of the air mass trajectories evidenced that the transport of this pollutant may have come from regions with industries that use biomass as fuel. The predominant water‐soluble ions in coarse and fine particulate were nitrate, potassium, calcium, magnesium, potassium, sulfate, and nitrate, respectively. The deposition fluxes of potassium, nitrate, and sulfate ions were higher during the sugarcane harvest than during the off‐season.

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Nanoparticles Emitted by Biomass Burning: Characterization and Monitoring of Risks

Costa

Fogarin

Costa

et al. 2018

Nanomaterials: Ecotoxicity, Safety, and Public Perception

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Atmospheric deposition of sulfur and inorganic nitrogen in the Southern Canadian Rocky Mountains from seasonal snowpacks and bulk summer precipitation

Cited by 11 publications

References 42 publications

Background atmospheric sulfate deposition at a remote alpine site in the Southern Canadian Rocky Mountains

Background atmospheric sulfate deposition at a remote alpine site in the Southern Canadian Rocky Mountains

Evaluation of the Dry Deposition of Particles Emitted by Biomass Combustion

Nanoparticles Emitted by Biomass Burning: Characterization and Monitoring of Risks

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