Developing a statistical model to explain the observed decline of atmospheric mercury

Wu, Qingru; Tang, Yi; Li, Liang; Deng, Ke; Tang, Guigang; Liu, Kaiyun; Ding, Dian; Zhang, Hui

doi:10.1016/j.atmosenv.2020.117868

Cited by 17 publications

(20 citation statements)

References 40 publications

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“…The weights of CWT in January 2015 were higher than those of other study years, and the region of high CWT values spread over Fujian Province and EC. Previous studies have also reported high levels of GEM in 2015 among urban Beijing, Changdao Island, rural Shanghai, and Chongming Island (Tang et al, 2018;Qin et al, 2020;Wang et al, 2020;Wu et al, 2020), which suggests a heavy GEM pollution on a large regional scale during 2015. The high GEM concentrations in January 2015 were likely due to a combination of high-level Hg emissions and adverse meteorological conditions.…”

Section: Long-distance Migrationmentioning

confidence: 89%

“…S3, 4). Recent studies have indicated either a stable or a slight decreasing trend for GEM or TGM concentrations in Chinese cities after 2013 due to China having applied vigorous measures to control air pollution (Qin et al, 2020;Wu et al, 2020;Yin et al, 2020). For instance, it was reported that GEM concentrations at Chongming Island in East China significantly decreased from 2014 to 2016, and the inflection point occurred before 2014 (Tang et al, 2018).…”

Section: Inter-annual Variationmentioning

confidence: 99%

“…The impact of local anthropogenic emissions, regional transport, and meteorological factors on GEM concentrations in Nanjing, East China, was quantified using GAMs (Zhang et al, 2021). GAMs were also used to explain the decline of GEM concentrations in Beijing, and results showed that reduction of anthropogenic mercury emissions, variation in meteorological conditions, and change in globe background level explained 51.5 %, 47.1 %, and 1.4 % of the decrease in GEM concentrations, respectively (Wu et al, 2020). It can be seen that GAMs are a promising tool to explore the effect of factors like anthropogenic emissions and natural perturbations on GEM concentrations.…”

Section: Introductionmentioning

confidence: 99%

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Measurement report: Atmospheric mercury in a coastal city of Southeast China – inter-annual variations and influencing factors

Shi

Chen

et al. 2022

Atmos. Chem. Phys.

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Abstract. The long-term monitoring of atmospheric mercury is an important part of the effective evaluation of the Minamata Convention on Mercury. Gaseous elemental mercury (GEM), along with conventional air pollutants and meteorological parameters, was simultaneously observed in Xiamen, Southeast China, in January and July over the period 2012–2020. GEM concentrations in January were highest in 2015 (4.47 ng m−3) and decreased by 2020 (3.93 ng m−3), while GEM concentrations in July were highest in 2017 (2.65 ng m−3) and lowest in 2020 (1.56 ng m−3). The temporal variation of GEM was typically characterized by higher concentrations in winter than in summer and in nighttime than in daytime. Bivariate polar plots and the concentration-weighted trajectory (CWT) model were used to identify the source regions of GEM on a local and regional scale. The results indicate that the high GEM concentrations in January 2015 were likely due to a combination of high-level Hg emissions and adverse meteorological conditions. Generalized additive models (GAMs), which use a regression analysis method, were established and applied to investigate the influencing factors on the inter-annual variation of GEM. The factors anthropogenic emissions, meteorological conditions, and transportation explained 37.8 %±11.9 %, 31.4 %±9.0 %, and 30.8 %±9.9 % on average of the variation of GEM concentrations, respectively. There was a positive relationship of daily GEM concentrations with T and RH, mostly linking to natural surface emissions and Hg chemical transformations. The interpretation rate of anthropogenic emissions has significantly decreased since 2012, indicating the effectiveness of emission mitigation measures in reducing GEM concentrations in the study region.

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Section: Long-distance Migrationmentioning

confidence: 89%

Section: Inter-annual Variationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Measurement report: Atmospheric mercury in a coastal city of Southeast China – inter-annual variations and influencing factors

Shi

Chen

et al. 2022

Atmos. Chem. Phys.

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“…The VWM Hg reduction during the cold season (from 12.4 ng L −1 in 2014 to 4.6 ng L −1 in 2018) was more pronounced than the reduction in the warm season (from 5.4 ng L −1 in 2014 to 2.7 ng L −1 in 2018). After considering the rainout effect of VWM Hg concentration (Figure S5), the seasonal variation of Hg concentration suggests that the airmass from northern China had greater VWM Hg reductions than the airmass from overseas [16,42]. Many previous observations and modeling results have shown that the TGM/GEM reduction in China can be explained by reduced anthropogenic emissions in China [16,22,42].…”

Section: Impacts Of Anthropogenic Emissions On Hg Wet Deposition Fluxmentioning

confidence: 91%

“…After considering the rainout effect of VWM Hg concentration (Figure S5), the seasonal variation of Hg concentration suggests that the airmass from northern China had greater VWM Hg reductions than the airmass from overseas [16,42]. Many previous observations and modeling results have shown that the TGM/GEM reduction in China can be explained by reduced anthropogenic emissions in China [16,22,42]. Hg emissions decreased more quickly in the winter due to the changing of residential heating methods [16].…”

Section: Impacts Of Anthropogenic Emissions On Hg Wet Deposition Fluxmentioning

confidence: 93%

Impacts of Anthropogenic Emissions and Meteorological Variation on Hg Wet Deposition in Chongming, China

Tang

Gao³

et al. 2020

Atmosphere

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Mercury (Hg) is a ubiquitous environmental toxicant that has caused global concern due to its persistence and bioaccumulation in the environment. Wet deposition is a crucial Hg input for both terrestrial and aquatic environments and is a significant indicator for evaluating the effectiveness of anthropogenic Hg control. Rainwater samples were collected from May 2014 to October 2018 in Chongming Island to understand the multi-year Hg wet deposition characteristics. The annual Hg wet deposition flux ranged from 2.6 to 9.8 μg m−2 yr−1 (mean: 4.9 μg m−2 yr−1). Hg wet deposition flux in Chongming was comparable to the observations at temperate and subtropical background sites (2.0–10.2 μg m−2 yr−1) in the northern hemisphere. Hg wet deposition flux decreased from 8.6 μg m−2 yr−1 in 2014–2015 to 3.8 μg m−2 yr−1 in 2016 and was attributed to a decrease in the volume-weighted mean (VWM) Hg concentration (−4.1 ng L−1 yr−1). The reduced VWM Hg was explained by the decreasing atmospheric Hg and anthropogenic emissions reductions. The annual Hg wet deposition flux further decreased from 3.8 μg m−2 in 2016 to 2.6 μg m−2 in 2018. The reduction of warm season (April–September) rainfall amounts (356–845 mm) mainly contributed to the Hg wet deposition flux reduction during 2016–2018. The multi-year monitoring results suggest that long-term measurements are necessary when using wet deposition as an indicator to reflect the impact of anthropogenic efforts on mercury pollution control and meteorological condition variations.

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Sources and risk assessment of atmospheric Hg during the 2022 Beijing Olympic Winter Games

Wang

Zhang

et al. 2023

Atmospheric Environment

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Developing a statistical model to explain the observed decline of atmospheric mercury

Cited by 17 publications

References 40 publications

Measurement report: Atmospheric mercury in a coastal city of Southeast China – inter-annual variations and influencing factors

Measurement report: Atmospheric mercury in a coastal city of Southeast China – inter-annual variations and influencing factors

Impacts of Anthropogenic Emissions and Meteorological Variation on Hg Wet Deposition in Chongming, China

Sources and risk assessment of atmospheric Hg during the 2022 Beijing Olympic Winter Games

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