Spatial patterns and temporal trends in mercury concentrations, precipitation depths, and mercury wet deposition in the North American Great Lakes region, 2002–2008

Risch, Martin R.; Fowler, Kathleen K.; Keeler, G. J.; Backus, Sean; Blanchard, Pierrette; Barres, James A.; Dvonch, J. Timothy

doi:10.1016/j.envpol.2011.05.030

Cited by 67 publications

(48 citation statements)

References 13 publications

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“…The sites are grouped according to the four subgroups listed above, which are arranged roughly west to east. In general precipitation totals increase from west to east, while Hg concentration and Hg deposition decrease from west to east in this region, consistent with earlier findings in the Great Lakes area (Risch et al, 2012) and northeastern US/eastern Canada (Miller et al, 2005;Huang et al, 2013). (Choi et al, 2013).…”

Section: Regional Contextsupporting

confidence: 80%

Mercury Wet Deposition and Speciated Air Concentrations from Two Urban Sites in New York State: Temporal Patterns and Regional Context

Ctverelo

Rattigan

Felton

et al. 2014

Aerosol Air Qual. Res.

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Since 2008, ambient speciated mercury (Hg) concentrations and weekly Hg wet deposition have been measured at two urban locations in New York -Rochester and New York City (borough of Bronx). These measurements were initiated to establish ambient Hg baselines ahead of anticipated emissions reductions, as well as characterize air concentrations and deposition at two different urban settings. In this paper seasonal and regional patterns in Hg wet deposition are presented, as well as seasonal, day of week and diurnal patterns in ambient Hg species at these two sites. The mean (and median) Hg concentration in precipitation was 9.56 ng/L (8.37 ng/L) at the Bronx site, and 9.95 ng/L (8.30 ng/L) at Rochester. Mean ambient air concentrations of gaseous elemental Hg (GEM), reactive gaseous Hg (RGM), and particle-bound Hg (PBM) at the Bronx and Rochester sites were 1.52 and 1.40 ng/m 3 , 6.26 and 8.24 pg/m 3 , and 7.96 and 13.48 pg/m 3 , respectively. Conditional probability function analysis was used to examine potential source regions impacting these two sites. Using these data we were able to examine monthly and diurnal patterns in speciated ambient Hg; however, more research is needed to more fully characterize potential emission sources that impact these sites.

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Section: Regional Contextsupporting

confidence: 80%

Mercury Wet Deposition and Speciated Air Concentrations from Two Urban Sites in New York State: Temporal Patterns and Regional Context

Ctverelo

Rattigan

Felton

et al. 2014

Aerosol Air Qual. Res.

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“…Risch et al [18] reported mean annual litterfall-Hg deposition in Midwestern states were the highest in the eastern USA and ranged from 12.6 to 18.8 µg/m 2 /year for 2007-2014. Litterfall Hg is thought to represent 75% of dry-Hg deposition to deciduous forests in North America and Europe [36] and was reported previously to be 60 to 80% of dry-Hg deposition at sites in the eastern USA [16,[37][38][39][40]. Data from NADP-LMMI were included in this study.…”

Section: Atmospheric-hg Monitoringmentioning

confidence: 99%

Spatial Patterns and Temporal Changes in Atmospheric-Mercury Deposition for the Midwestern USA, 2001–2016

Risch

Kenski²

2018

Atmosphere

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Spatial patterns and temporal changes in atmospheric-mercury (Hg) deposition were examined in a five-state study area in the Midwestern USA where 32% of the stationary sources of anthropogenic Hg emissions in the continental USA were located. An extensive monitoring record for wet and dry Hg deposition was compiled for 2001-2016, including 4666 weekly precipitation samples at 13 sites and 27 annual litterfall-Hg samples at 7 sites. This study is the first to examine these Hg data for the Midwestern USA. The median annual precipitation-Hg deposition at the study sites was 10.4 micrograms per square meter per year (µg/m 2 /year) and ranged from 5.8 µg/m 2 /year to 15.0 µg/m 2 /year. The median annual Hg concentration was 9.4 ng/L. Annual litterfall-Hg deposition had a median of 16.1 µg/m 2 /year and ranged from 9.7 to 23.4 µg/m 2 /year. Isopleth maps of annual precipitation-Hg deposition indicated a recurring spatial pattern similar to one revealed by statistical analysis of weekly precipitation-Hg deposition. In that pattern, high Hg deposition in southeastern Indiana was present each year, frequently extending to southern Illinois. Most of central Indiana and central Illinois had similar Hg deposition. Areas with comparatively lower annual Hg deposition were observed in Michigan and Ohio for many years and frequently included part of northern Indiana. The area in southern Indiana where high Hg deposition predominated had the highest number of extreme episodes of weekly Hg deposition delivering up to 15% of the annual Hg load from precipitation in a single week. Modeled 48-h back trajectories indicated air masses for these episodes often arrived from the south and southwest, crossing numerous stationary sources of Hg emissions releasing from 23 to more than 300 kg Hg per year. This analysis suggests that local and regional, rather than exclusively continental or global Hg emissions were likely contributing to the extreme episodes and at least in part, to the spatial patterns of precipitation-Hg deposition in the study area. Statistically significant temporal decreases in weekly precipitation-Hg concentrations in the study area between the periods 2001-2013 and 2014-2016 were observed, coinciding with reported reductions in Hg emissions in the USA required by implementation of national Hg emissions-control rules. These decreases in atmospheric-Hg concentrations are believed to have resulted in the reduced atmospheric-Hg deposition recorded because precipitation depths between the two periods were not significantly different. The Hg-monitoring data for the study area identified an atmospheric deposition response to decreased local and regional Hg emissions.

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“…NADP-MDN data for the Indianapolis site had average weekly Hg wet deposition among the highest in the Great Lakes Region for 2002-2010 (Risch et al, 2014). An analysis of spatial patterns and temporal trends in Hg wet deposition in the Great Lakes region by Risch et al (2012) indicated a substantial localized net increase in Hg concentrations and deposition in central Indiana near Indianapolis, 2002-2008. On a larger scale, a synthesis of national Hg wet deposition monitoring data and related studies by Butler et al (2007) identified examples of substantial Hg deposition in urban areas while noting the limited number of urban Hg monitoring locations, and Keeler et al (2006) demonstrated that local emissions sources contribute to local Hg deposition, thus reinforcing the importance of local components in the regional Hg cycle.…”

Section: Atmospheric Hg Deposition In Urban Areasmentioning

confidence: 99%

Geochemical legacies and the future health of cities: A tale of two neurotoxins in urban soils

Filippelli

Risch

Laidlaw

et al. 2015

Elementa: Science of the Anthropocene

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Spatial patterns and temporal trends in mercury concentrations, precipitation depths, and mercury wet deposition in the North American Great Lakes region, 2002–2008

Cited by 67 publications

References 13 publications

Mercury Wet Deposition and Speciated Air Concentrations from Two Urban Sites in New York State: Temporal Patterns and Regional Context

Mercury Wet Deposition and Speciated Air Concentrations from Two Urban Sites in New York State: Temporal Patterns and Regional Context

Spatial Patterns and Temporal Changes in Atmospheric-Mercury Deposition for the Midwestern USA, 2001–2016

Geochemical legacies and the future health of cities: A tale of two neurotoxins in urban soils

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