Recent atmospheric lead deposition recorded in an ombrotrophic peat bog of Great Hinggan Mountains, Northeast China, from 210Pb and 137Cs dating

Bao, Kunshan; Xia, Wei; Lü, Xianguo; Wang, Guoping

doi:10.1016/j.jenvrad.2010.05.004

Cited by 40 publications

(32 citation statements)

References 37 publications

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“…Cs, is provided elsewhere [26,28]. The following is a brief summary of these procedures: at the Motianling peat deposit on the north facing slope (ca.…”

Section: Pb and 137mentioning

confidence: 99%

“…In contrast to those extensive amounts of work, few similar studies have been conducted in China. Most of the latter focused on either on Hg [24,25] or Pb [26,27]. Another two emerging studies used inorganic geochemistry of the peat record to reconstruct the history of atmospheric dust fluxes, and focused on major lithogenic elements such as Al, Ca, Fe, Mg and Ti and other trace elements such as rare earth elements (REE), Sc, Y and Th [28,29].…”

Section: Introductionmentioning

confidence: 99%

“…There are extensive peatlands developed on the alpine areas in northeast China, such as Great Hinggan Mountains [56]. Recently, we did an initial study of geochemical records through 210 Pb-dated cores from a peatland in this region and provided a preliminary estimate of atmospheric Pb and soil dust fluxes over the past 200 years [26,28]. However, a complete representation of the factors affecting TMs accumulation in peatlands is still absent in China.…”

Section: Introductionmentioning

confidence: 99%

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Atmospheric Deposition History of Trace Metals and Metalloids for the Last 200 Years Recorded by Three Peat Cores in Great Hinggan Mountain, Northeast China

et al. 2015

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A large number of studies on trace metals and metalloids (TMs) accumulations in peatlands have been reported in Europe and North America. Comparatively little information is available on peat chronological records of atmospheric TMs flux in China. Therefore, the objective of our study was to determine the concentrations and accumulation rates (ARs) of TMs in Motianling peatland from Great Hinggan Mountain, northeast China, and to assess these in relation to establish a historical profile of atmospheric metal emissions from anthropogenic sources. To meet these aims we analyzed 14 TMs (As, Ba, Cd, Co, Cr, Cu, Mo, Ni, Pb, Sr, Sb, Tl, and Zn) and Pb isotopes ( Pb ratio close to 1.9. ARs and enrichment factors (EFs) of TMs suggested enhanced metal concentrations near the surface of the peatland (in peat layers dated from the 1980s) linked to an increasing trend since the 2000s. This pollution pattern is also fingerprinted by the Pb isotopic composition, even after the ban of leaded gasoline use in China. Emissions from coal and leaded gasoline combustions in northern China are regarded as one of the major sources of anthropogenic Pb input in this region; meanwhile, the long-distance transportation of Pb-bearing aerosols from Mongolia should be also taken into consideration. The reconstructed history of TMs' pollution over the past ca. 200 years is in agreement with the industrial development in China and clearly illustrates the influence of human activities on local rural environments. This study shows the utility of taking multi-cores to show the heterogeneity in peat accumulation and applying PCA, EF and Pb isotope methods in multi-proxies analyses for establishing a high resolution geochemical metal record from peatland.

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“…Cs, is provided elsewhere [26,28]. The following is a brief summary of these procedures: at the Motianling peat deposit on the north facing slope (ca.…”

Section: Pb and 137mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Atmospheric Deposition History of Trace Metals and Metalloids for the Last 200 Years Recorded by Three Peat Cores in Great Hinggan Mountain, Northeast China

et al. 2015

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“…A number of different conclusions have been reached from comparisons with independent age markers. El-Daoushyet al (1982), Ali et al (2008), Clymo et al (1990), MacKenzie et al (1997), Vile et al (1995), Piotrowska et al (2010), Bao et al (2010) and Appleby et al (1997) all found good agreement with independent markers, whilst Urban et al (1990), Belyea and Warner (1994), Oldfield et al (1979) and Oldfield et al (1995) found some disagreement. Often only a few cores are dated, but studies such as Oldfield et al (1995) and Clymo et al (1990) which use multiple cores and Urban et al (1990) and Belyea and Warner (1994) Pb mobility than drier sites and suggest that the mobility is not predictable in terms of direction in the profile.…”

Section: Even Minor Degrees Of Mobility Could Impact Upon Ages Calculmentioning

confidence: 96%

“…However, there is no standardised methodology to define if an independent date agrees well with the 210 Pb CRS date and many studies rely on subjective comparison within individual sequences (e.g. Belyea andWarner, 1994 andBao et al, 2010). Moreover, independent date markers can be subject to as much error as 210 Pb dating, especially where they involve the onset of industrial Pb pollution (MacKenzie et al, 1997;de Vleeschouwer et al, 2009) or the highly mobile 137 Cs (Urban et al, 1990;Bao et al, 2010, andAli et al 2008).…”

Section: Even Minor Degrees Of Mobility Could Impact Upon Ages Calculmentioning

confidence: 99%

Comparative dating of recent peat deposits using natural and anthropogenic fallout radionuclides and Spheroidal Carbonaceous Particles (SCPs) at a local and landscape scale

Parry

Charman

Blake

2013

Quaternary Geochronology

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Abstract:Proxy records from recently accumulated peats provide valuable information about past environmental change, but they depend on high quality chronological information to calculate rates and timing of change. However, there is uncertainty in the accuracy and consistency of the methodologies used for dating recent peats. This study compares results from Spheroidal Carbonaceous Particles (SCPs) and natural and anthropogenic fallout radionuclides ( 210 Pb, 137 Cs and 241 Am) used to date three replicate cores from three contrasting sites. Data are used to test the consistency of dating techniques within and between sites, and to assess the impact of local conditions on geochronological results.There is broad consistency in results, but there is also a significant disagreement between dates in a number of cores, both within and between sites. A relatively dry site that had been affected by past burning and erosion showed the greatest consistency between methods and replicate cores. Wetter, less degraded sites showed least consistency. Using patterns of (dis)agreement between dating techniques we assess the potential causes of dating inaccuracy. The data support previous suggestions that 210 Pb is mobile in wetter conditions, and suggests that 241 Am can be considered an increasingly valuable radionuclide. Finally, our data suggest the current estimates for SCP-based ages in the region are incorrect and require further regional calibration.Using several techniques on replicate cores from three sites in the same area has provided a more robust evaluation of the likely reliability of individual techniques and the processes that may adversely affect them. We conclude that until advances are made in understanding the processes behind the variable quality of SCP and fallout radionuclide dating, using two or more dating techniques will greatly improve understanding of the validity of a peatland chronology, especially in wetter locations.

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Environmental change and human land‐use over the past 200 years in the Great Hinggan Mountains, Northeastern China

et al. 2020

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Mountain ecosystems are sensitive to environmental changes and are affected by direct and indirect anthropogenic activities. This study sought to understand the impacts of human occupation, environmental and climate change on the Great Hinggan Mountains (GHM) in Northeastern China. The last 200 years of environmental changes are reconstructed by analyzing sediment cores from five small mountain lakes. Cores were dated using 210Pb and 137Cs radioisotopes, microscopic charcoal identified regional fire activity and fossil pollen analysis reconstructed temporal and spatial changes in vegetation. Peaks in 137Cs, 226Ra and microscopic charcoal flux were found to follow similar trends between sites. The radioisotope records reflect redistribution processes, such as erosion and fire events, which overwhelm the atmospheric fallout signal in the GHM. Microscopic charcoal increased from 1950 CE and peaked at all sites after 2000 CE suggesting that current fire management, coupled with a warmer climate due to global warming, may be leading to more wildfire events in the region. Pinus, Quercus and Betula declined at all sites as human occupation occurred in the early 1900s. Initially, open forest and grassland expanded in response to overexploitation of forests, followed by arboreal pollen reaching maximum values after 2000 CE. This study concludes that the present‐day mixed coniferous broad‐leaved forest dominating the southern region of the GHM is a product of changing fire activity, excessive logging and, more recently, forestry management and vegetation regeneration. Results suggest further management strategies are needed to address land degradation and wildfire events in mountain regions of Northeastern China.

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Recent atmospheric lead deposition recorded in an ombrotrophic peat bog of Great Hinggan Mountains, Northeast China, from 210Pb and 137Cs dating

Cited by 40 publications

References 37 publications

Atmospheric Deposition History of Trace Metals and Metalloids for the Last 200 Years Recorded by Three Peat Cores in Great Hinggan Mountain, Northeast China

Atmospheric Deposition History of Trace Metals and Metalloids for the Last 200 Years Recorded by Three Peat Cores in Great Hinggan Mountain, Northeast China

Comparative dating of recent peat deposits using natural and anthropogenic fallout radionuclides and Spheroidal Carbonaceous Particles (SCPs) at a local and landscape scale

Environmental change and human land‐use over the past 200 years in the Great Hinggan Mountains, Northeastern China

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