Large Variation of Mercury Isotope Composition During a Single Precipitation Event at Lhasa City, Tibetan Plateau, China

Yuan, Shiwen; Zhang, Yuanyuan; Chen, Jiubin; Kang, Shichang; Zhang, Jian; Feng, Xinbin; Cai, Hongming; Wang, Zhuhong; Wang, Zhongwei; Huang, Qiang

doi:10.1016/j.proeps.2015.07.066

Cited by 53 publications

(53 citation statements)

References 13 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The positive Δ 200 Hg signal is mainly observed in precipitation and during Hg 0 oxidation processes 200 Hg MIF (Blum et al, ; Chen et al, ; Sun et al, ). Data from rainfall samples collected at global sites show that Hg in precipitation of remote sites has a consistently different isotopic signatures from those found in litter and soil samples (Figures a–d; Chen et al, ; Demers et al, ; Gratz et al, ; Sherman et al, ; Yuan et al, ). Therefore, the positive Δ 199 Hg and Δ 200 Hg in precipitation can be treated as a unique atmospheric Hg (II) input endmember (Blum et al, ; Chen et al, ; Demers et al, ; Maxime Enrico et al, ; M. Enrico et al, ; Gratz et al, ; D. Obrist et al, ; Yu et al, ).…”

Section: Resultsmentioning

confidence: 99%

“…Relationships among (a) Δ 200 Hg versus δ 202 Hg, (b) Δ 200 Hg versus Δ 199 Hg, (c)Δ 199 Hg versus δ 202 Hg, (d)Δ 199 Hg versus Δ 201 Hg. The Hg isotopic signatures for geological Hg are derived from literatures (Blum et al, ; Smith et al, ) and for wet deposition from literatures (Chen et al, ; Demers et al, ; Gratz et al, ; Sherman et al, ; Yuan et al, ).…”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Effects of Precipitation on Mercury Accumulation on Subtropical Montane Forest Floor: Implications on Climate Forcing

et al. 2019

Self Cite

View full text Add to dashboard Cite

Processes facilitated by precipitation play an important role on mercury (Hg) accumulation on forest floor and therefore key to Hg cycling in forest ecosystems. Sites along the windward slope of 1,250 to 2,400 m at Mt. Ailao, Southwestern China, have higher precipitation than the leeward slope sites. In this study, measurements of Hg concentration and associated stable isotope composition for soil, fresh, and degraded litterfall samples were made at sites along two slopes of Mt. Ailao to quantify the direct and indirect effects of precipitation on Hg accumulation on forest floor. Higher soil Hg concentrations, larger litterfall Hg depositions, and faster litter decomposition rates were observed on the windward slope (1,250-2,400 m). Data of Hg isotopic signatures suggest that Hg in surface soils is mainly derived from litterfall Hg input. Precipitation enhances litterfall Hg deposition by increasing litter biomass production, reduces litter decomposition rate, facilitates short-term Hg uptake to decomposing litter, and potentially increases microbial activity that increases Hg loss via microbial reduction or runoff. Structural equation modeling results support that the indirect effect of precipitation on increased biomass production merge as the most important factor controlling soil Hg variation. Given the climate forcing on global precipitation pattern and vegetation growth cycle, Hg biogeochemical cycling is likely to continue to evolve under the changing climate.Plain Language Summary Precipitation has direct and indirect effects on Hg accumulation and transformation on forest floor. The direct effect is that atmospheric Hg enters into forest floor via precipitation, throughfall, and cloud water deposition. In addition, precipitation likely has an indirect effect on Hg accumulation by influencing litter biomass production and postdepositional processes of Hg, such as litter decomposition, Hg reemission, and surface runoff. The objective of this study is to better quantify the direct and indirect effects of precipitation on Hg accumulation on forest floor. The study sites are located along the leeward and windward slopes of Mt. Ailao in Southwest China. Precipitation intensity is the main variable at the same altitude between two slopes. Our results showed that influences from precipitation on soil Hg accumulation are largely through the indirect effects caused by influencing litterfall Hg deposition. We also suggest that the changed precipitation pattern can force variations of litterfall Hg deposition and soil Hg accumulation globally.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Effects of Precipitation on Mercury Accumulation on Subtropical Montane Forest Floor: Implications on Climate Forcing

et al. 2019

Self Cite

View full text Add to dashboard Cite

show abstract

“…Higher Hg concentrations in precipitation during the winter dry season were potentially due to elevated wintertime atmospheric PBM concentrations in China (Fu et al, 2008;Zhang et al, 2013;Xu et al, 2014;Zhu et al, 2014), which could be incorporated into wet deposition via scavenging processes below cloud. Lower VWM Hg concentrations in precipitation during the summer wet season were mostly associated with higher precipitation amounts at the sampling sites, suggesting increasing amounts of precipitation would dilute the Hg concentra- tions in samples that were scavenged from the boundary layer during the onset of the precipitation (Gratz et al, 2009;Yuan et al, 2015).…”

Section: Precipitation Hg Concentrations and Deposition Fluxesmentioning

confidence: 99%

Atmospheric wet and litterfall mercury deposition at urban and rural sites in China

Yang

Lang

et al. 2016

Atmos. Chem. Phys.

Self Cite

View full text Add to dashboard Cite

Abstract. Mercury (Hg) concentrations and deposition fluxes in precipitation and litterfall were measured at multiple sites (six rural sites and an urban site) across a broad geographic area in China. The annual deposition fluxes of Hg in precipitation at rural sites and an urban site were 2.0 to 7.2 and 12.6 ± 6.5 µg m −2 yr −1 , respectively. Wet deposition fluxes of Hg at rural sites showed a clear regional difference with elevated deposition fluxes in the subtropical zone, followed by the temporal zone and arid/semi-arid zone. Precipitation depth is the primary influencing factor causing the variation of wet deposition. Hg fluxes through litterfall ranged from 22.8 to 62.8 µg m −2 yr −1 , higher than the wet deposition fluxes by a factor of 3.9 to 8.7 and representing approximately 75 % of the total Hg deposition at the forest sites in China. This suggests that uptake of atmospheric Hg by foliage is the dominant pathway to remove atmospheric Hg in forest ecosystems in China. Wet deposition fluxes of Hg at rural sites of China were generally lower compared to those in North America and Europe, possibly due to a combination of lower precipitation depth, lower GOM concentrations in the troposphere and the generally lower cloud base heights at most sites that wash out a smaller amount of GOM and PBM during precipitation events.

show abstract

“…Over the past decade, studies have indicated that Hg isotope ratios are useful for differentiating Hg sources in terrestrial samples, such as sediments (Jackson et al, 2004;Feng et al, 2010;Ma et al, 2013), soils (Biswas et al, 2008;Zhang et al, 2013a) and biota (Sherman et al, 2013;Yin et al, 2013;Jackson, 2015), and for distinguishing potential biogeochemical processes that Hg had undergone (Jackson et al, 2013;Sherman et al, 2013;Yin et al, 2013;Masbou et al, 2015). Up to now, several studies have reported Hg isotopic compositions in atmospheric samples (Zambardi et al, 2009;Gratz et al, 2010;Chen et al, 2012;Sherman et al, 2012Sherman et al, , 2015Demers et al, 2013Demers et al, , 2015aRolison et al, 2013;Fu et al, 2014Fu et al, , 2016Yuan et al, 2015;Das et al, 2016;Enrico et al, 2016). These studies reported large variations in 199 Hg and δ 202 Hg values for GEM (ranging from −0.41 to 0.06 ‰ for 199 Hg, and from −3.88 to 1.43 ‰ for δ 202 Hg) (Zambardi et al, 2009;Gratz et al, 2010;Sherman et al, 2010;Rolison et al, 2013;Yin et al, 2013;Demers et al, 2015b;Das et al, 2016;Enrico et al, 2016;Fu et al, 2016) and for Hg in precipitation (from 0.04 to 1.16 ‰ for 199 Hg, and from −4.37 to 1.48 ‰ for δ 202 Hg) (Gratz et al, 2010;…”

Section: Introductionmentioning

confidence: 99%

“…Up to now, several studies have reported Hg isotopic compositions in atmospheric samples (Zambardi et al, 2009;Gratz et al, 2010;Chen et al, 2012;Sherman et al, 2012Sherman et al, , 2015Demers et al, 2013Demers et al, , 2015aRolison et al, 2013;Fu et al, 2014Fu et al, , 2016Yuan et al, 2015;Das et al, 2016;Enrico et al, 2016). These studies reported large variations in 199 Hg and δ 202 Hg values for GEM (ranging from −0.41 to 0.06 ‰ for 199 Hg, and from −3.88 to 1.43 ‰ for δ 202 Hg) (Zambardi et al, 2009;Gratz et al, 2010;Sherman et al, 2010;Rolison et al, 2013;Yin et al, 2013;Demers et al, 2015b;Das et al, 2016;Enrico et al, 2016;Fu et al, 2016) and for Hg in precipitation (from 0.04 to 1.16 ‰ for 199 Hg, and from −4.37 to 1.48 ‰ for δ 202 Hg) (Gratz et al, 2010;Chen et al, 2012;Sherman et al, 2012Sherman et al, , 2015Demers et al, 2013;Wang et al, 2015b;Yuan et al, 2015). In addition, recent studies have found MIF of even Hg isotopes (even-MIF, 200 Hg) in natural samples mainly related to the atmosphere, rendering Hg a unique heavy metal having "three-dimensional" isotope systems (Chen et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

Isotopic composition for source identification of mercury in atmospheric fine particles

et al. 2016

Self Cite

View full text Add to dashboard Cite

Abstract. The usefulness of mercury (Hg) isotopes for tracing the sources and pathways of Hg (and its vectors) in atmospheric fine particles (PM2.5) is uncertain. Here, we measured Hg isotopic compositions in 30 potential source materials and 23 PM2.5 samples collected in four seasons from the megacity Beijing (China) and combined the seasonal variation in both mass-dependent fractionation (represented by the ratio 202Hg ∕ 198Hg, δ202Hg) and mass-independent fractionation of isotopes with odd and even mass numbers (represented by Δ199Hg and Δ200Hg, respectively) with geochemical parameters and meteorological data to identify the sources of PM2.5-Hg and possible atmospheric particulate Hg transformation. All PM2.5 samples were highly enriched in Hg and other heavy metals and displayed wide ranges of both δ202Hg (−2.18 to 0.51 ‰) and Δ199Hg (−0.53 to 0.57 ‰), as well as small positive Δ200Hg (0.02 to 0.17 ‰). The results indicated that the seasonal variation in Hg isotopic composition (and elemental concentrations) was likely derived from variable contributions from anthropogenic sources, with continuous input due to industrial activities (e.g., smelting, cement production and coal combustion) in all seasons, whereas coal combustion dominated in winter and biomass burning mainly found in autumn. The more positive Δ199Hg of PM2.5-Hg in spring and early summer was likely derived from long-range-transported Hg that had undergone extensive photochemical reduction. The study demonstrated that Hg isotopes may be potentially used for tracing the sources of particulate Hg and its vectors in the atmosphere.

show abstract

Large Variation of Mercury Isotope Composition During a Single Precipitation Event at Lhasa City, Tibetan Plateau, China

Cited by 53 publications

References 13 publications

Effects of Precipitation on Mercury Accumulation on Subtropical Montane Forest Floor: Implications on Climate Forcing

Effects of Precipitation on Mercury Accumulation on Subtropical Montane Forest Floor: Implications on Climate Forcing

Atmospheric wet and litterfall mercury deposition at urban and rural sites in China

Isotopic composition for source identification of mercury in atmospheric fine particles

Contact Info

Product

Resources

About