210Pb-dating of a lake sediment core from Lough Carra (Co. Mayo, western Ireland): use of paleolimnological data for chronology validation below the 210Pb dating horizon

O’Reilly, Jennifer; Vintró, Luis León; Mitchell, P.I.; Donohue, Ian; Leira, Manel; Hobbs, William O.; Irvine, Kenneth

doi:10.1016/j.jenvrad.2010.09.003

Cited by 24 publications

(5 citation statements)

References 8 publications

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“…This model assumes that the supply of 210 Pb to the sediment is proportional to the sedimentation rate and, thus, will change in response to changes in sediment flux. Application of the CIC model was considered justified on the basis of the smooth exponential decline of 210 Pb unsup concentrations when plotted against accumulated dry mass (O’Reilly et al, 2011). The age T m of the sediment layer is given by Eq.…”

Section: Methodsmentioning

confidence: 99%

Tracking land-cover changes with sedimentary charcoal in the Afrotropics

et al. 2013

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Fires have played an important role in creating and maintaining savannas over the centuries and are also one of the main natural disturbances in forests. The functional role of fires in savannas and forests can be investigated through examining sedimentary charcoal in order to reconstruct long-term fire history. However, the relationship between charcoal and vegetation structure in tropical grassy ecosystems remains to be elucidated. Here, we compared recent charcoal records from lake sediments in three tropical ecosystems (forest, savanna, and forest-savanna mosaic) with land cover inferred from remote-sensing images. Charcoal width-to-length (W/L) ratio is a good proxy for changes in fuel type. At one of the lakes, a significant W/L modification from values >0.5 (mainly wood) to <0.5 (¿grass) was recorded simultaneously with changes in land cover. Indeed, a significant deforestation was recorded around this lake in the remote-sensing imagery between 1984 and 1994. The results also indicate that a riparian forest around a lake could act as a physical filter for charcoal accumulation; we used the mean charcoal size as a proxy to evaluate this process. Charcoal Accumulation Rates (CHAR), a burned biomass proxy, were combined with W/L ratio and the mean charcoal size to investigate the land-use history of the landscapes surrounding the study sites. This combined approach allowed us to distinguish between episodic slash-and-burn practices in the forest and managed fields or pastures burning frequently. (Résumé d'auteur

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Section: Methodsmentioning

confidence: 99%

Tracking land-cover changes with sedimentary charcoal in the Afrotropics

et al. 2013

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“…In the upper 0-139 cm section, the bulk sedimentation rate was 0.90407 g/cm 2 /yr, roughly equal to 1.956 cm/yr. This rate is much greater than sedimentation rates reported by Donohue et al (2010) or O'Reilly et al (2011) from the north and mid-basins of Lough Carra, 0.137 and 0.148 g/cm 2 /yr, respectively. The rate is also higher than most Irish Lakes with sedimentation rates of 0.02 to 0.18 g/cm 2 /yr (Nowlan et al 2000).…”

Section: Laboratory Analysiscontrasting

confidence: 53%

Sediment Phosphorus Fractions And The Nutrient History Of Lough Carra, Ireland

Downer¹

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“…The results show that by means of the profile distribution of unsupported 210 Pb, it is seen that 210 Pb depositions to the lake is not systematic along the line which lies from northern station to southern station. Similarly 210 Pb fluxes calculated from core inventory display the changing character amongst stations and indicate the presence of soil erosion [22]. Because, mean global 210 Pb flux is lower than the calculated one.…”

Section: Resultsmentioning

confidence: 92%

“…Profile distribution of 210 Pb is directly affected by the atmospheric 210 Pb flux in sediment core [4,8,11,15]. If high supply of 210 Pb concentration is existing in any station, it will indicate sediment focusing or significant amount of contribution from the catchment area [22]. Role of the heavy metals which is originating from human activities or from natural contributions is an important impact on environment.…”

Section: Introductionmentioning

confidence: 99%

Applying of Modified Constant Rate of Supply Model to Lake Sediments in <sup>210</sup>Pb Dating and Assessment of Some Heavy Metals

Sert

2018

SDÜ Fen Bil Enst Der

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In present study, activity concentrations were indirectly obtained by utilizing alpha spectrometry. Sediment chronology was determined by using modified CRS model. Average sediment accumulation rates are 0.351, 0.324, 0.222 g cm -2 y -1 in S-1, S-2, S-3 stations respectively. With reference to atmospheric 210 Pb flux (29 mBq cm -2 y -1 ) Lake Karagöl has extra outer 210 Pb input (soil erosion) from the catchment area. In terms of Enrichment Factor (EF), heavy metal concentrations are lower than the anthropogenic values. So it can be said that the elements except Au originate from the continental supply. Au has unexpectedly too high level EF value (58.22) in northern station (S-1) of the Lake Karagöl. It corresponds to time interval from 2004 to nowadays. However Pollution Load Index (PLI) says different consequences from the EF values. PLI value has only baseline levels of pollutants in northern part of the Lake Karagöl as it shows progressive deterioration of the site for southern part of the Lake Karagöl.

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210Pb-dating of a lake sediment core from Lough Carra (Co. Mayo, western Ireland): use of paleolimnological data for chronology validation below the 210Pb dating horizon

Cited by 24 publications

References 8 publications

Tracking land-cover changes with sedimentary charcoal in the Afrotropics

Tracking land-cover changes with sedimentary charcoal in the Afrotropics

Sediment Phosphorus Fractions And The Nutrient History Of Lough Carra, Ireland

Applying of Modified Constant Rate of Supply Model to Lake Sediments in <sup>210</sup>Pb Dating and Assessment of Some Heavy Metals

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