Mercury deposition in Southern New Hampshire, 2006–2009

Lombard, Melissa A.; Bryce, J. G.; Mao, Huiting; Talbot, R. W.

doi:10.5194/acp-11-7657-2011

Cited by 56 publications

(34 citation statements)

References 44 publications

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“…3.5. This is consistent with the findings of Lombard et al (2011) in that both the total seasonal Hg wet deposition and volume-weighted Hg concentration in rain water reached the annual minimum in winter during their three year sample collection at TF (coastal).…”

Section: Rainy Drysupporting

confidence: 81%

Speciated mercury at marine, coastal, and inland sites in New England – Part 2: Relationships with atmospheric physical parameters

et al. 2012

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Abstract. Long-term continuous measurements of gaseous elemental mercury (Hg 0 ), reactive gaseous mercury (RGM), and particulate phase mercury (Hg P ) were conducted at coastal (Thompson Farm, denoted as TF), marine (Appledore Island, denoted as AI), and elevated inland rural (Pac Monadnock, denoted as PM) monitoring sites of the AIRMAP Observing Network. Diurnal, seasonal, annual, and interannual variability in Hg 0 , RGM, and Hg P from the three distinctly different environments were characterized and compared in Part 1. Here in Part 2 relationships between speciated mercury (i.e., Hg 0 , RGM, and Hg P ) and climate variables (e.g., temperature, wind speed, humidity, solar radiation, and precipitation) were examined. The best point-to-point correlations were found between Hg 0 and temperature in summer at TF and spring at PM, but there was no similar correlation at AI. Subsets of data demonstrated regional impacts of episodic dynamic processes such as strong cyclonic systems on ambient levels of Hg 0 at all three sites, possibly through enhanced oceanic evasion of Hg 0 . A tendency of higher levels of RGM and Hg P was identified in spring and summer under sunny conditions in all environments. Specifically, the 10th, 25th, median, 75th, and 90th percentile mixing ratios of RGM and Hg P increased with stronger solar radiation at both the coastal and marine sites. These metrics decreased with increasing wind speed at AI indicating enhanced loss of RGM and Hg P through deposition. RGM and Hg P levels correlated with temperature positively in spring, summer and fall at the coastal and marine locations. At the coastal site relationships between RGM and relative humidity suggested a clear decreasing tendency in all metrics from <40 % to 100 % relative humidity in all seasons especially in spring, compared to less variability in the marine environment. The effect of precipitation on RGM at coastal and marine locations was similar. At the coastal site, RGM levels were a factor of 3-4 to two orders of magnitude higher under dry conditions than rainy conditions in all seasons. In winter RGM mixing ratios appeared to be mostly above the limit of detection (LOD) during snowfalls suggesting less scavenging efficiency of snow. Mixing ratios of Hg P at the coastal and marine sites remained above the LOD under rainy conditions. Precipitation had negligible impact on the magnitude and pattern of diurnal variation of Hg P in all seasons in the marine environment.

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Section: Rainy Drysupporting

confidence: 81%

Speciated mercury at marine, coastal, and inland sites in New England – Part 2: Relationships with atmospheric physical parameters

et al. 2012

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“…Motor vehicles were one of the most important contributors to atmospheric Hg in Chongqing (Yang et al, 2009). In Chongqing, the number of civil motor vehicles had increased for 5.8 folds from 2000 to 2010 (Chongqing Statistics Yearbook, 2001-2011. NO − 3 in precipitation made up 30 % of all measured anions (Fig.…”

Section: Anthropogenic Influence On Mercury Distribution In Precipitamentioning

confidence: 99%

“…Guo et al (2008) also pointed out that maximum THg concentrations in rain in winter may be related to coal burning in domestic activities. NO x in atmosphere is emitted directly from the combustion of fossil fuels (such as coal) and transportation sources (Caffrey et al, 2010;Lynam and Keeler, 2006;Lombard et al, 2011). NO x exhibits peak concentrations in the morning, typically associated with the morning commute emissions (Touma et al, 2006).…”

Section: Anthropogenic Influence On Mercury Distribution In Precipitamentioning

confidence: 99%

“…Numerous studies suggested that atmospheric deposition is the primary source of Hg to terrestrial and aquatic ecosystems (Lombard et al, 2011), such as Great Lakes (Fitzgerald et al, 1991;Landis and Keeler, 2002), remote inland lakes (Sorensen et al, 1990) and forested catchments (Munthe et al, 1995a). Some other studies considered atmospheric deposition of MeHg to be a minor contributor to the aquatic ecosystem (Mason et al, 2000), while some investigators argued that wet deposition could be an important source of MeHg for certain ecosystems (Munthe et al, 1995b;Rolfhus et al, 2003), such as upland watershed at the ELA (St. Louis et al, 1994).…”

Section: Introductionmentioning

confidence: 99%

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Spatial and temporal distributions of total and methyl mercury in precipitation in core urban areas, Chongqing, China

Wang

Meng

et al. 2012

Atmos. Chem. Phys.

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Abstract. The spatial and temporal distribution patterns of mercury (Hg) in precipitation were investigated in the core urban areas of Chongqing, China. During the period from July 2010 to June 2011, total mercury (THg) and methyl mercury (MeHg) concentrations in precipitation were analysed from three sampling sites. Our results suggested that the volume-weight mean THg and MeHg concentrations in precipitation were 30.67 ng l −1 and 0.31 ng l −1 , respectively. The proportion of MeHg in THg ranged from 0.1 % to 7.6 % with a mean value of 1.3 %. THg and MeHg concentrations showed seasonal variations, while the highest THg value was measured in winter. Contrarily, the highest MeHg concentration was observed in autumn. Additionally, a geographically gradual decline of THg concentration in precipitation was observed from the downtown to the suburb, then to the controlled site in the city. 5 mm rainfall might be a threshold for the full wash-out capability. Rainfall above 5 mm may have a diluting effect for the concentrations of THg. Moreover, the current research implies that the coal combustion and motor vehicles could be the dominant sources for Hg in the precipitation.

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“…Previous studies suggest that inefficient scavenging of GOM by snow could explain the lower Hg wet deposition rates in the winter [Selin and Jacob, 2008;Lombard et al, 2011]. In contrast, scavenging of particle-bound mercury by snow is efficient particularly at higher latitudes [Amos et al, 2012].…”

Section: Snow Scavengingmentioning

confidence: 76%

Relative contributions of gaseous oxidized mercury and fine and coarse particle‐bound mercury to mercury wet deposition at nine monitoring sites in North America

Cheng¹,

Zhang²,

Mao

2015

JGR Atmospheres

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Relative contributions to mercury wet deposition by gaseous oxidized mercury (%GOM) and fine and coarse particle-bound mercury (%FPBM and %CPBM) were estimated making use of monitored FPBM air concentration and mercury wet deposition at nine North American locations. Scavenging ratios of particulate inorganic ions (K + and Ca 2+ , Mg 2+ and Na + ) were used as a surrogate for those of FPBM and CPBM, respectively. FPBM and CPBM were estimated to contribute 8-36% and 5-27%, respectively, depending on the location, to total wet deposition. The rest of the 39-87% was attributed to the contribution of GOM. The average %GOM, %FPBM and %CPBM among all locations were 65%, 17%, and 18%, respectively. The relative distributions of %GOM, %FPBM, and %CPBM were influenced by Hg(II) gas-particle partitioning, urban site characteristics, and precipitation type. At the regional scale, %GOM dominated over %FPBM and %CPBM. However, the sum of FPBM and CPBM contributed to nearly half of the total Hg wet deposition in urban areas, which was greater than other site categories and is attributed to higher FPBM air concentrations. At four locations, %FPBM exceeded %GOM during winter in contrast to summer, suggesting the efficient snow scavenging of aerosols. The results from this study are useful in improving mercury transport models since most of these models do not estimate CPBM, but frequently use monitored mercury wet deposition data for model evaluation.

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Mercury deposition in Southern New Hampshire, 2006–2009

Cited by 56 publications

References 44 publications

Speciated mercury at marine, coastal, and inland sites in New England – Part 2: Relationships with atmospheric physical parameters

Speciated mercury at marine, coastal, and inland sites in New England – Part 2: Relationships with atmospheric physical parameters

Spatial and temporal distributions of total and methyl mercury in precipitation in core urban areas, Chongqing, China

Relative contributions of gaseous oxidized mercury and fine and coarse particle‐bound mercury to mercury wet deposition at nine monitoring sites in North America

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