Distribution and wet deposition fluxes of total and methyl mercury in Wujiang River Basin, Guizhou, China

Guo, Yanna; Feng, Xinbin; Li, Zhonggen; He, Tianrong; Yan, Haiyu; Meng, Bo; Zhang, Junfang; Qiu, Guangle

doi:10.1016/j.atmosenv.2008.06.006

Cited by 108 publications

(71 citation statements)

References 35 publications

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“…In China, wet deposition of 35 µg m −2 yr −1 was reported in a rural area (Wujiang River Basin) in Guizhou in 2006 (Guo et al, 2008). Also, wet deposition of 150 µg m −2 yr −1 and dry deposition of 170 µg m −2 yr −1 in the urban area of Changchun from July 1999 to July 2000 were also reported (Feng et al, 2004b).…”

Section: Model-predicted Mercury Deposition In East Asiamentioning

confidence: 99%

Estimating mercury emission outflow from East Asia using CMAQ-Hg

et al. 2010

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Abstract. East Asia contributes to nearly 50% of the global anthropogenic mercury emissions into the atmosphere. Recently, there have been concerns about the long-range transport of mercury from East Asia, which may lead to enhanced dry and wet depositions in other regions. In this study, we performed four monthly simulations (January, April, July and October in 2005) using CMAQ-Hg v4.6 for a number of emission inventory scenarios in an East Asian model domain. Coupled with mass balance analyses, the chemical transport of mercury in East Asia and the resulted mercury emission outflow were investigated. The total annual mercury deposition in the region was estimated to be 821 Mg, with 396 Mg contributed by wet deposition and 425 Mg by dry deposition. Anthropogenic emissions were responsible for most of the estimated deposition (75%). The deposition caused by emissions from natural sources was less important (25%). Regional mercury transport budgets showed strong seasonal variability, with a net removal of RGM (7-15 Mg month −1 ) and PHg (13-21 Mg month −1 ) in the domain, and a net export of GEM (60-130 Mg month −1 ) from the domain. The outflow caused by East Asian emissions (anthropogenic plus natural) was estimated to be in the range of 1369-1671 Mg yr −1 , of which 50-60% was caused by emissions from natural sources. The emission outflow repCorrespondence to: C.-J. Lin (jerry.lin@lamar.edu) resented about 75% of the total mercury emissions in the region, and would contribute to 20-30% of mercury deposition in remote receptors.

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Section: Model-predicted Mercury Deposition In East Asiamentioning

confidence: 99%

Estimating mercury emission outflow from East Asia using CMAQ-Hg

et al. 2010

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“…Previous studies in China used both a bulk collector (Fu et al, 2008b;Guo et al, 2008;Wan et al, 2009a;Fu et al, 2010a) and a wet-only collector (Fu et al, 2010b;Liu et al, 2011;Wang et al, 2012;Zhu et al, 2014;Zhou et al, 2013). The bulk collector tends to overestimate the wet deposition flux due to the dry deposition of TPM and GOM in the sampling period.…”

Section: Wet Depositionmentioning

confidence: 99%

“…The THg and MeHg concentrations in rainwater collected by bulk precipitation collectors at remote sites of China were much higher than those using wet-only precipitation collectors (Table 3). Some of the bulk precipitation samples were collected at locations close to anthropogenic Hg sources and on a monthly basis (Guo et al, 2008;Fu et al, 2008b;Wan et al, 2009b), and therefore dry deposition of TPM and GOM can also contribute to the measured wet deposition. Wet-only deposition fluxes of THg and MeHg were 1.8-7.0 µg m −2 yr −1 (mean = 5.1 µg m −2 yr −1 , n = 4) and 0.01-0.06 µg m −2 yr −1 (mean = 0.04 µg m −2 yr −1 , n = 2) at remote sites, and 13.4-56.5 µg m −2 yr −1 (mean = 31.9 µg m −2 yr −1 , n = 4) and 0.05-0.28 µg m −2 yr −1 (mean = 0.16 µg m −2 yr −1 , n = 2) at urban sites, respectively (Table 3).…”

Section: Atmospheric Hg Deposition In Chinamentioning

confidence: 99%

Observations of atmospheric mercury in China: a critical review

et al. 2015

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Abstract. China presently contributes the largest amount of anthropogenic mercury (Hg) emission into the atmosphere in the world. Over the past decade, numerous studies have been conducted to characterize the concentration and forms of atmospheric Hg in China, which provide insights into the spatial and temporal distributions of atmospheric Hg through ground-based measurements at widely diverse geographical locations and during cruise and flight campaigns. In this paper, we present a comprehensive review of the state of understanding in atmospheric Hg in China. Gaseous elemental mercury (GEM) and particulate-bound mercury (PBM) measured at the remote sites in China are substantially elevated compared to the background values in the Northern Hemisphere. In Chinese urban areas, the highly elevated GEM, PBM and gaseous oxidized mercury (GOM) were mainly derived from local anthropogenic Hg emissions, whereas regional anthropogenic emissions and long-range transport from domestic source regions are the primary causes of the elevated GEM and PBM concentrations at remote sites. Using 7-9 years of continuous observations at a remote site and an urban site, a slight increase in atmospheric GEM (2.4-2.5 % yr −1 ) was identified (paired samples test: p < 0.01), which is in agreement with the increasing domestic anthropogenic emissions. Anthropogenic GEM emission quantity in China estimated through the observed GEM / CO concentration ratios ranged from 632 to 1138 t annually over the past decade, 2-3 times larger than published values using emission activity data. Modeling results and filed measurements show dry deposition is the predominant process for removing Hg from the atmosphere, 2.5-9.0 times larger than wet deposition, due to the elevated atmospheric GEM and PBM concentrations that facilitate dry deposition to terrestrial landscapes. Further studies to reconcile the observed and simulated Hg concentrations, to understand the impact of domestic emission reduction on Hg concentration and deposition and to delineate the role of Hg emission and deposition of China in the global Hg biogeochemical cycle, are needed.

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“…Only a few monitoring studies of Hg deposition have been carried out at remote and suburban locations in China. Guo et al (2008) and Fu et al (2010b) reported that the annual mean Hg concentrations in precipitation were higher in some semi-remote and remote Chinese areas, when compared to some areas in other countries (Guentzel et al, 2001;Sakata and Marumoto, 2005). Although China is recognised as one of the biggest emitters of atmospheric Hg (Zhang and Wong, 2007;Jiang et al, 2006), there lacks long-term Hg research networks capable to depict temporal and spatial distribution of Hg in precipitation.…”

Section: Introductionmentioning

confidence: 99%

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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Distribution and wet deposition fluxes of total and methyl mercury in Wujiang River Basin, Guizhou, China

Cited by 108 publications

References 35 publications

Estimating mercury emission outflow from East Asia using CMAQ-Hg

Estimating mercury emission outflow from East Asia using CMAQ-Hg

Observations of atmospheric mercury in China: a critical review

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

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