The influence of climate change on the accumulation of polycyclic aromatic hydrocarbons, black carbon and mercury in a shrinking remote lake of the southern Tibetan Plateau

Lin, Hai; Wang, Xiaoping; Gong, Ping; Ren, Juanjuan; Wang, Chuanfei; Yuan, X.; Wang, Lei; Yao, Tandong

doi:10.1016/j.scitotenv.2017.06.038

Cited by 42 publications

(29 citation statements)

References 69 publications

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“…The concentration and flux values of BC in QY lake sediment are broadly higher than those in other lakes of the TP 22,23,51 and the Arctic 52 (Table S17) and are similar to the concentration range of Ledvica lake 53 in Slovenian (glacial origin) and lower than Gosankunda lake in South Asia 23 (Table S17).…”

Section: ■ Results and Discussionmentioning

confidence: 59%

“…48,49 As shown in Table S17, the concentration and flux values of Hg in QY lake sediment are higher than values reported for remote lakes in the TP, Arctic, and Antarctic. 17,21,22,32,50 Similarly, as compared with lakes from South Asian countries (Table S17), which are the source regions of pollutants found in the southern TP, 22 the concentration and flux values of Hg in QY sediment are about 6 and 10 times lower, respectively.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

“…17,21−23 Basically, the deposition fluxes of pollutants in lake sediments show an increasing trend, which is attributable to the impact of South Asian emissions. 22,23 However, the contribution of melting glaciers should also be of consideration for interpreting this accumulation. 23 To date, to the best of our knowledge, no study has sought to quantify the contributions of different input processes of pollutants to glacial lakes in TP.…”

Section: ■ Introductionmentioning

confidence: 99%

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Accumulation of Pollutants in Proglacial Lake Sediments: Impacts of Glacial Meltwater and Anthropogenic Activities

Zhu

Wang

Lin

et al. 2020

Environ. Sci. Technol.

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With global warming, the melting of glaciers can result in the release of pollutants into the environment. For remote Alpine lakes, both atmosphere-deposited anthropogenic pollutants and glacier-released pollutants can eventually sink in the sediment. To date, there has, to the best of our knowledge, been no attempt at quantifying the contributions of these processes to the accumulation of pollutants in glacial lake sediment. To fill this gap, a semienclosed proglacial lake located in the southern Tibetan Plateau was chosen and a 28 cm sediment core, which can be dated back to 1836, was used to explore the temporal trends of trace elements, Hg, and black carbon (BC) during the past two centuries. Geochemical indicators (Rb/Sr, Ti−Zr−Hf, and sedimentary rate) in sediment showed an overall continuous warming of the lake, while the temporal trends of fluxes of toxic elements and BC were broadly associated with their emission patterns. By using a positive matrix factorization model, the contribution of the anthropogenic source rose from <10% in the 1850s to >40% after the 1980s. However, the signal of glacial meltwater release was also distinct, and the greatest contribution of ice−snow meltwater reached up to 61% in the 1950s. Regarding the most recent two decades, 90% of pollutant deposition in the Tibetan sediment can be attributed to the combined forces of primary emissions and glacial release.

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Section: ■ Results and Discussionmentioning

confidence: 59%

Section: ■ Results and Discussionmentioning

confidence: 99%

Section: ■ Introductionmentioning

confidence: 99%

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Accumulation of Pollutants in Proglacial Lake Sediments: Impacts of Glacial Meltwater and Anthropogenic Activities

Zhu

Wang

Lin

et al. 2020

Environ. Sci. Technol.

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“…This demonstrates that the reduction in biomass burning and the increase in fossil fuel combustion altered the BC structure and changed the burial process of BC in the sediment. The char/soot ratio in the Fuxian Lake sediment is much higher than that in atmospheric particulate matter (2.2 and 1.5 in PM 2.5 ) and total suspended particulates and also much higher than that on the Qinghai–Tibet plateau (Ranwu: 0.85–2.2; Qiangyong Co: 1.33–2.66; Tanglha: 1.36–4.79; Lingge Co: 1.25–2.67; Nam Co: 3.06–6.31; Pumoyum Co: 1.93–4.60; Qinghai: 0.19–1.44 and 0.57–1.78), where BC is dominated by atmospheric transmission sources. It is evident that the large use of fossil fuels is the primary driver behind the increased amount of soot, which has caused the BC in the lake sediment to exhibit higher aromaticity, reduced reactivity, and to be of a smaller size.…”

Section: Discussionmentioning

confidence: 99%

Anthropogenic-Driven Alterations in Black Carbon Sequestration and the Structure in a Deep Plateau Lake

Huang

et al. 2021

Environ. Sci. Technol.

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The continuous flux of organic carbon (OC) from terrestrial ecosystems into inland water is an important component of the global carbon cycle. The buried OC pool in inland water sediments is considerable, and black carbon (BC) is a significant contributor to this OC pool because of the continuous growth in BC emissions. Therefore, determining the effect of BC on total OC burial and variations in the structure of BC during the burial process will contribute significantly to our understanding of lacustrine carbon cycling. This study investigated BC burial and its structural variations in response to anthropogenic drivers using four dated sedimentary cores from a deep plateau lake in China. The BC burial rate rose from 0.96 ± 0.64 g•m −2 •y −1 (mean of sedimentary cores pre-1960s) to 4.83 ± 1.25 g•m −2 •y −1 (after 2000), which is a 5.48 ± 2.12-fold rise. The increase of char was similar to those of BC. The growth rate of soot was 7.20 ± 4.30 times, which is higher than that of BC and char, increasing from 0.12 ± 0.08 to 0.64 ± 0.23 g•m −2 •y −1 . There was a decreasing trend in the ratio of char and soot at a mean rate of 62.8 ± 6.46% (excluding core 3) in relation to increased fossil fuel consumption. The contribution of BC to OC burial showed a significant increasing trend from the past to the present, particularly in cores 3 and 4, and the mean contribution of the four cores was 11.78 ± 2.84%. Source tracer results from positive matrix factorization confirmed that the substantial use of fossil fuels has promoted BC burial and altered the BC structure. This has resulted in BC with a higher aromatic content in the lake sediment, which exhibits reduced reactivity and increased stability. The strong correlation between BC and allochthonous total OC indicates that the input pathways of the buried BC in this plateau lake sediment were terrestrial surface processes and not atmospheric deposition.

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“…China has more than 2700 lakes with surface areas greater than 1 km 2 , approximately 70% of which are located in high plateau regions (Wang and Dou, 1998). Plateau lakes can not only provide many functions, such as drinking, irrigation, fishery, and tourism (Lin et al, 2017;Moser et al, 2019), but also act as the important headwaters of the large and long rivers. However, due to population growth coupled with the industrial and agricultural development around these plateau lakes, they have undergone eutrophication similar to lakes elsewhere (Hillman et al, 2014;Dai et al, 2017;Huang et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

Comparison of spatiotemporal carbon, nitrogen, and phosphorus burial in two plateau lacustrine sediments: implication for N and P control

Wang

Xue

Zhang

et al. 2021

Environ Sci Pollut Res

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The long-term accumulation, burial and release of nutrients, such as carbon (C), nitrogen (N) and phosphorus (P) in lacustrine sediments are responsible for the global lake eutrophication. Interpretation of the spatiotemporal sedimentary record of nutrients (C, N and P) in contrasting trophic level of lakes is helpful for understanding the evolutionary process of water eutrophication. Based on the radiochronology of 210 Pbex and 137 Cs, a comparative study of spatial and temporal concentrations, burial of total organic carbon (TOC), total nitrogen (TN) and total phosphorus (TP), the sources of organic matter were conducted using sediment cores from two plateau lakes Dianchi (DC) and Fuxian (FX) of SW China. Results showed that concentrations and burial of C, N and P in sediments of DC, a shallow hypertrophic lake with the maximum depth of 5.8 m, were both higher than those in FX, an oligotrophic deep lake with the maximum depth of 155.0 m. For both lakes the molar ratio of TOC/TN increased in the sediments moving from north to south. The values of TOC/TN molar ratios increased over time in DC and was higher than in FX. The extremely high values of TOC/TN appeared in the central and southern parts of FX, indicating the impacts of accumulation effect and sediment focusing in the deeper region and indirect supplement from the Lake Xingyun (XY), an adjoining lake connected with FX via the Gehe River. Time-integrated sources identification in DC indicated the contribution of allochthonous sources was dominant over the past few decades, which contributed to the increased trophic level of the lake. The comparison of relationships of carbon accumulation rates (CAR), nitrogen accumulation rates (NAR) and phosphorous accumulation rates (PAR), the ratios of N/P and the utilizations of N and P fertilizer between DC and FX implied that both of N and P inputs should be limited for reducing the trophic level, but N control was predominant in comparison with P for both lakes. The results indicated that caution is required in plateau lakes to limit transition from oligotrophic to eutrophic in these lakes.

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The influence of climate change on the accumulation of polycyclic aromatic hydrocarbons, black carbon and mercury in a shrinking remote lake of the southern Tibetan Plateau

Cited by 42 publications

References 69 publications

Accumulation of Pollutants in Proglacial Lake Sediments: Impacts of Glacial Meltwater and Anthropogenic Activities

Accumulation of Pollutants in Proglacial Lake Sediments: Impacts of Glacial Meltwater and Anthropogenic Activities

Anthropogenic-Driven Alterations in Black Carbon Sequestration and the Structure in a Deep Plateau Lake

Comparison of spatiotemporal carbon, nitrogen, and phosphorus burial in two plateau lacustrine sediments: implication for N and P control

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