Total mercury in snow and ice samples from Canadian High Arctic ice caps and glaciers: A practical procedure and method for total Hg quantification at low pgg−1 level

Zheng, Jiahong; Pelchat, P; Vaive, Judy E.; Bass, David; Ke, Fu

doi:10.1016/j.scitotenv.2013.08.078

Cited by 15 publications

(14 citation statements)

References 30 publications

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“…Beginning in the 1980s and lasting until the early 1990s, a consistently decreasing trend in THg occurred. This trend was consistent with a decrease in global mercury production (Faı¨n et al, 2009) and with other snow layer records from the Arctic and Antarctica (Han et al, 2014;Zheng et al, 2014). In addition, an elevated THg concentration (approximately six times greater than the background value) occurred during the early 1990s in the 29-K and 29-L snow pits.…”

Section: Temporal Variations Of the Thg And Possible Sourcessupporting

confidence: 87%

“…Next, the THg concentrations in the Upper Fremont Glacier ice core showed a decreasing trend (Schuster et al, 2002), and a similar trend was found in the Summit snow layers (Faı¨n et al, 2009) and the two sites in the Canadian High Arctic, the Agassiz Ice Cap and the Mt. Oxford Ice Field (Zheng et al, 2014). The United States Clean Air Act of 1970 and the Clean Air Amendment of 1990 were partly responsible for this reduction (Schuster et al, 2002).…”

Section: Temporal Variations Of the Thg And Possible Sourcesmentioning

confidence: 52%

“…In addition, simultaneous decreases in the THg concentrations were also recorded for the Antarctic Taylor Valley and Dome Fuji snow layers between 1987 and 1993 (Witherow and Lyons, 2008;Han et al, 2014), implying that the anthropogenic effects on mercury production are globally influenced. Another obvious increase in the THg concentration occurred in the mid-1990s and was recorded in both Arctic and Antarctic snow layers (Rebecca et al, 2008;Zheng et al, 2014;Han et al, 2014). This increase could be associated with a small increase in worldwide mercury production in the mid-1990s (Pacyna et al, 2006;USGS, 2006;Lindberg et al, 2007).…”

Section: Temporal Variations Of the Thg And Possible Sourcesmentioning

confidence: 99%

“…4). Many studies of THg concentrations in snow and ice around the world cover this period Faı¨n et al, 2009; 2014; Zheng et al, 2014). Between the 1970s and 1980s, higher THg values were recorded in the Summit snow layers (Greenland) (Faı¨n et al, 2009).…”

Section: Temporal Variations Of the Thg And Possible Sourcesmentioning

confidence: 99%

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Spatial and temporal variations of total mercury in Antarctic snow along the transect from Zhongshan Station to Dome A

Li¹,

Kang

Shi³

et al. 2014

Tellus B: Chemical and Physical Meteorology

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A B S T R A C T In this study, the concentrations of total mercury (THg) and ions deposited in the surface snow and snow pits in the eastern Antarctic along the 29th inland route of the Chinese National Antarctic Research Expedition were analysed. The THg concentrations in the surface snow ranged from 0.22 to 8.29 ng/L and elevated concentrations were detected in the inland regions of higher altitudes (3000Á4000 m). The spatial distribution of the THg in the snow pits showed greater inland concentrations with mean concentrations of B0.2Á1.33 ng/L. The THg concentrations in the coastal snow pit (29-A) showed higher concentrations in the summer snow layers than in the winter snow layers. The THg records from the two inland snow pits (29-K and 29-L) spanned decades and indicated elevated THg concentrations between the late 1970s and early 1980s and during the mid-1990s. The temporal variations of THg in the Antarctic snow layers were consistent with anthropogenic emissions around the world. In addition, the Pinatubo volcanic eruption was the primary contributor to the 1992 THg peak that was observed in the inland snow pits.

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Section: Temporal Variations Of the Thg And Possible Sourcessupporting

confidence: 87%

Section: Temporal Variations Of the Thg And Possible Sourcesmentioning

confidence: 52%

Section: Temporal Variations Of the Thg And Possible Sourcesmentioning

confidence: 99%

Section: Temporal Variations Of the Thg And Possible Sourcesmentioning

confidence: 99%

See 2 more Smart Citations

Spatial and temporal variations of total mercury in Antarctic snow along the transect from Zhongshan Station to Dome A

Li¹,

Kang

Shi³

et al. 2014

Tellus B: Chemical and Physical Meteorology

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“…The mean Hg concentrations in snow cover from the semi-urban site in Poznań were much higher than in snow cover from Mt. Oxford Icefield (0.38 ng L −1 ) and Agassiz Ice Cap (0.66 ng L −1 )—high Arctic regions (Zheng et al 2014). There are also several other Hg measurements in snow pit from high-altitude sites in Siberian Altai and Swiss Alps (Eyrikh et al 2003).…”

Section: Resultsmentioning

confidence: 99%

Distribution and variability of total mercury in snow cover—a case study from a semi-urban site in Poznań, Poland

Siudek

2016

Environ Sci Pollut Res

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In the present paper, the inter-seasonal Hg variability in snow cover was examined based on multivariate statistical analysis of chemical and meteorological data. Samples of freshly fallen snow cover were collected at the semi-urban site in Poznań (central Poland), during 3-month field measurements in winter 2013. It was showed that concentrations of atmospherically deposited Hg were highly variable in snow cover, from 0.43 to 12.5 ng L−1, with a mean value of 4.62 ng L−1. The highest Hg concentration in snow cover coincided with local intensification of fossil fuel burning, indicating large contribution from various anthropogenic sources such as commercial and domestic heating, power generation plants, and traffic-related pollution. Moreover, the variability of Hg in collected snow samples was associated with long-range transport of pollutants, nocturnal inversion layer, low boundary layer height, and relatively low air temperature. For three snow episodes, Hg concentration in snow cover was attributed to southerly advection, suggesting significant contribution from the highly polluted region of Poland (Upper Silesia) and major European industrial hotspots. However, the peak Hg concentration was measured in samples collected during predominant N to NE advection of polluted air masses and after a relatively longer period without precipitation. Such significant contribution to the higher Hg accumulation in snow cover was associated with intensive emission from anthropogenic sources (coal combustion) and atmospheric conditions in this area. These results suggest that further measurements are needed to determine how the Hg transformation paths in snow cover change in response to longer/shorter duration of snow cover occurrence and to determine the interactions between mercury and absorbing carbonaceous aerosols in the light of climate change.

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Historical variations of mercury stable isotope ratios in Arctic glacier firn and ice cores

Zdanowicz

Krümmel

Poulain

et al. 2016

Global Biogeochemical Cycles

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The concentration and isotopic composition of mercury (Hg) were determined in glacier core samples from Canadian Arctic ice caps dating from preindustrial to recent time (early 21st century). Mean Hg levels increased from ≤ 0.2 ng L−1 in preindustrial time to ~0.8–1.2 ng L−1 in the modern industrial era (last ~200 years). Hg accumulated on Arctic ice caps has Δ199Hg and Δ201Hg that are higher (~ −1 to 2.9‰) than previously reported for Arctic snow impacted by atmospheric Hg depletion events (mostly < −1‰), suggesting that these events contribute little to Hg accumulation on ice caps. The range of δ202Hg, Δ199Hg, and Δ201Hg in glacier cores overlaps with that of Arctic Hg0(g) and of seawater in Baffin Bay and also with that of midlatitude precipitation and industrial Hg sources, including coal and Hg ores. A core from Agassiz ice cap (80.7°N) shows a ~ +1‰ shift in δ202Hg over the nineteenth to twentieth centuries that could reflect changes in the isotopic composition of the atmospheric Hg pool in the High Arctic in response to growing industrial emissions at lower latitudes. This study is the first ever to report on historical variations of Hg stable isotope ratios in Arctic ice cores. Results could help constrain future modeling efforts of the global Hg biogeochemical cycle and the atmosphere's response to changing Hg emissions, past and future.

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Total mercury in snow and ice samples from Canadian High Arctic ice caps and glaciers: A practical procedure and method for total Hg quantification at low pgg−1 level

Cited by 15 publications

References 30 publications

Spatial and temporal variations of total mercury in Antarctic snow along the transect from Zhongshan Station to Dome A

Spatial and temporal variations of total mercury in Antarctic snow along the transect from Zhongshan Station to Dome A

Distribution and variability of total mercury in snow cover—a case study from a semi-urban site in Poznań, Poland

Historical variations of mercury stable isotope ratios in Arctic glacier firn and ice cores

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