Atmospheric deposition of mercury in Florida: The fams project (1992?1994)

Guentzel, Jane L.; Landing, William M.; Gill, Gary A.; Pollman, Curtis D.

doi:10.1007/bf01189689

Cited by 79 publications

(27 citation statements)

References 14 publications

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“…Summertime concentrations are larger than the wintertime concentrations by a factor of 2-3. This seasonality has been reported in many different studies [52][53][54][55] and reflects the stronger oxidation of Hg(0) to Hg(II) during summer, providing more Hg(II) for scavenging in rain [12,40]. The GEOS-Chem BASE simulation of VWM Hg concentration is within one standard deviation of MDN observations (Figure 2, left panels).…”

Section: Observations and Modelsupporting

confidence: 81%

Decreases in Mercury Wet Deposition over the United States during 2004–2010: Roles of Domestic and Global Background Emission Reductions

Zhang

Jaeglé

2013

Atmosphere

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Wet deposition of mercury (Hg) across the United States is influenced by changes in atmospheric conditions, domestic emissions and global background emissions. We examine trends in Hg precipitation concentrations at 47 Mercury Deposition Network (MDN) sites during 2004-2010 by using the GEOS-Chem nested-grid Hg simulation. We run the model with constant anthropogenic emissions and subtract the model results from the observations. This helps to remove the variability in observed Hg concentrations caused by meteorological factors, including precipitation. We find significant decreasing trends in Hg concentrations in precipitation at MDN sites in the Northeast (−4.1 ± 0.49% yr −1 ) and Midwest (−2.7 ± 0.68% y r−1 ). Over the Southeast (−0.53 ± 0.59% yr −1 ), trends are weaker and not significant, while over the West, trends are highly variable. We conduct model simulations assuming a 45% decrease in Hg emissions from domestic sources in the modeled period and a uniform 12% decrease in background atmospheric Hg concentrations. The combination of domestic emission reductions and decreasing background concentrations explains the observed trends over the Northeast and Midwest, with domestic emission reductions accounting for 58-46% of the decreasing trends. Over the Southeast, we overestimate the observed decreasing trend, indicating potential issues with our assumption of uniformly decreasing background Hg concentrations.

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Section: Observations and Modelsupporting

confidence: 81%

Decreases in Mercury Wet Deposition over the United States during 2004–2010: Roles of Domestic and Global Background Emission Reductions

Zhang

Jaeglé

2013

Atmosphere

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“…In our laboratory, no significant difference was found for the storage samples in Teflon and PET bottles (Paired t-test, p ¼ 0.028) for three months. The procedures of field blanks for WP and TF were referred to the description of Guentzel et al (1995) and Glass and Sorensen (1999). The reagents for preserving and analyzing of samples were of ultra pure quality grade.…”

Section: Validation Of Analytical and Sampling Methodsmentioning

confidence: 99%

“…The collecting bottles were pre-acidified with 7.5 ml of 6 N HCl (MOS, Suprapur) at the beginning of sampling to avoid the losses of Hg for volatilization or absorption on the container walls (Guentzel et al, 1995;Krabbenhoft et al, 1995). All water samples were preserved by 2% (v/v) HCl to stabilize mercury, and freezing stored in the dark and analyzed for two months.…”

Section: Field Samplingmentioning

confidence: 99%

Mercury fluxes and pools in three subtropical forested catchments, southwest China

Wang

Zhang

Xiao

et al. 2009

Environmental Pollution

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The subtropical forested catchments are important for retention of atmospheric mercury deposition in southwest China. a r t i c l e i n f o a b s t r a c tForested catchments are an important part of the mercury (Hg) cycle and a link between the atmospheric and the aquatic environments. In this study, Hg input and output fluxes and its retention were investigated at subtropical forested catchments in southwest China. Significantly enhanced atmospheric Hg inputs were observed, and the contribution of litterfall Hg plays a more important role at these subtropical forested catchments. The ratios of Hg output fluxes from stream water to total input were 2.5% and 1.2% for LGS and TSP, which were markedly lower than those reported from Europe and North America. The current annual input Hg only accounted for 0.8 and 1.8 per mille to the Hg stored in the upper 90 cm of soil in LGS and TSP. These suggest that subtropical forested catchments are important for retention of atmospheric mercury deposition in southwest China.

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“…[21] Wet deposition of Hg has previously been studied in south Florida [Dvonch et al, 1999Guentzel et al, 1995;Landing et al, 1995]. These studies reported that the highest concentrations and deposition of Hg are observed in the May-September time period.…”

Section: Meteorologymentioning

confidence: 99%

The effects of the coastal environment on the atmospheric mercury cycle

2003

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[1] Atmospheric mercury (Hg) species were investigated on the east coast of Florida during June 2000. The site was impacted by air mass transport from the Atlantic Ocean and south Florida. Periods with atmospheric transport from the Atlantic were characterized by low concentrations of elemental gaseous Hg and inorganic divalent reactive gaseous mercury (RGM), demonstrating that the marine boundary layer was not a significant source of RGM to this coastal site as previous researchers have hypothesized. When anthropogenic impacts were observed at the site, indicated by elevated concentrations of gases including HNO 3 and SO 2 , RGM concentrations had higher daytime maximums. Particulate phase Hg concentrations were higher than can be explained by sea spray alone, as determined by chemical analysis of the seawater, suggesting that gaseous Hg is diffusing into the sea-salt aerosol. Although atmospheric Hg concentrations were not elevated, the observed scavenging of Hg gases by sea-salt aerosols indicates that Hg may be rapidly cycled at the atmosphere-ocean interface between gaseous, aerosol, and oceanic forms. Deposition of aerosol enriched in Hg via this process may constitute a significant global mercury flux to the oceans.

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Atmospheric deposition of mercury in Florida: The fams project (1992?1994)

Cited by 79 publications

References 14 publications

Decreases in Mercury Wet Deposition over the United States during 2004–2010: Roles of Domestic and Global Background Emission Reductions

Decreases in Mercury Wet Deposition over the United States during 2004–2010: Roles of Domestic and Global Background Emission Reductions

Mercury fluxes and pools in three subtropical forested catchments, southwest China

The effects of the coastal environment on the atmospheric mercury cycle

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