AB initio derivation of formulations for210Pb dating of sediments

Joshi, S. R.; Shukla, B. S.

doi:10.1007/bf02060548

Cited by 39 publications

(17 citation statements)

References 4 publications

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“…3). The former was assessed from sediment accumulation rates (ω) obtained using the 210 Pb method and validated against the 137 Cs distribution (Joshi and Shukla, 1991;Pempkowiak, 1991) and organic carbon concentrations in the sediments (C org ) (Eq. 4).…”

Section: Organic Carbon Burial In the Bottom Sedimentsmentioning

confidence: 99%

The carbon budget of the Baltic Sea

Kuliński

Pempkowiak

2011

Biogeosciences

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Abstract. This paper presents the results of a comprehensive study of the Baltic Sea carbon budget. The Baltic Sea is very much influenced by terrestrial carbon input. Rivers are the largest carbon source, and their input amounts to 10.90 Tg C yr −1 (Tg = 10 12 g) with a 37.5 % contribution of organic carbon. On the other hand, carbon is effectively exported from the Baltic to the North Sea (7.67 Tg C yr −1 ) and is also buried in bottom sediments (2.73 Tg C yr −1 ). The other sources and sinks of carbon are of minor importance. The net CO 2 emission (1.05 Tg C yr −1 ) from the Baltic to the atmosphere was calculated as the closing term of the carbon budget presented here. There is a net loss of organic carbon, which indicates that the Baltic Sea is heterotrophic.

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Section: Organic Carbon Burial In the Bottom Sedimentsmentioning

confidence: 99%

The carbon budget of the Baltic Sea

Kuliński

Pempkowiak

2011

Biogeosciences

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“…Average radiocarbon sedimentation rates were calculated with the aid of the DepAge software, developed by Louis Maher Jr., of the U.S. Geological Survey (http://www. geology.wisc.edu/Ã maher/inqua.html, accessed on October 10,2005). 210 Pbxs and 137 Cs activities were determined by gamma ray spectrometry, using a low background Ge detector, EG&G ORTEC, GM×25190 P model, with resolution of 1.9 keV to 1332.40 keV photopeak of 60 Co. 210 Pbxs activity (via total 210 Pb-226 Ra, after 21 days to allow radioactive equilibrium) was measured at 46 keV and 137 Cs activity was measured at 661.66 keV according to the methodology of analysis and data acquisition described in …”

Section: Methodsmentioning

confidence: 99%

Is there a Technique for the Determination of Sedimentation Rates based on Calcium Carbonate Content? A Comparative Study on the Southeastern Brazilian Shelf

Figueira

Tessler

Mahiques

et al. 2007

Soils and Foundations

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In this paper we evaluate the utilization of the sedimentation rate values obtained by the carbonate content technique (Fukue et al., 1996(Fukue et al., , 1999 Pbxs but do reveal a signiˆcant diŠerence from radiocarbon estimates. Nevertheless, no signiˆcant correlation was obtained in the comparisons between 137 Cs, 210 Pbxs and calcium carbonate. Thus it would seem that the calcium carbonate technique may be used for raw estimates of sedimentation rates. Taking a carbonate level which can be correlated with a tsunami that occurred in 1542 as well as the peak activity of 137 Cs in 1963-1965 as age references we obtained an average value for the calcium carbonate precipitation rate for the study area which is close to that given by Fukue et al. (1996Fukue et al. ( , 1999. Nevertheless our results suggest that the assumption of a single carbonate precipitation value may be too generic to be taken as valid for the calculation of sedimentation rates.

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“…The calculation of the sedimentation rate based on the unsupported Pb was made via the CIC (Concentration Initial Constant) Model (Appleby andOldfield 1978, Joshi andShukla 1991). The sedimentation rate was calculated using the formula:…”

Section: Chronologymentioning

confidence: 99%

Coastline changes and sedimentation related with the opening of an artificial channel: the Valo Grande Delta, SE Brazil

Mahiques

Figueira

Alves

et al. 2014

An. Acad. Bras. Ciênc.

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The role played by human activity in coastline changes indicates a general tendency of retreating coasts, especially deltaic environments, as a result of the recent trend of sea level rise as well as the blockage of the transfer of sediments towards the coast, especially due to the construction of dams. This is particularly important in deltaic environments which have been suffering a dramatic loss of area in the last decades. In contrast, in this paper, we report the origin and evolution of an anthropogenic delta, the Valo Grande delta, on the south-eastern Brazilian coast, whose origin is related to the opening of an artificial channel and the diversion of the main flow of the Ribeira de Iguape River. The methodology included the analysis of coastline changes, bathymetry and coring, which were used to determine the sedimentation rates and grain-size changes over time. The results allowed us to recognize the different facies of the anthropogenic delta and establish its lateral and vertical depositional trends. Despite not being very frequent, anthropogenic deltas represent a favorable environment for the record of natural and anthropogenic changes in historical times and, thus, deserve more attention from researchers of different subjects.

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AB initio derivation of formulations for210Pb dating of sediments

Cited by 39 publications

References 4 publications

The carbon budget of the Baltic Sea

The carbon budget of the Baltic Sea

Is there a Technique for the Determination of Sedimentation Rates based on Calcium Carbonate Content? A Comparative Study on the Southeastern Brazilian Shelf

Coastline changes and sedimentation related with the opening of an artificial channel: the Valo Grande Delta, SE Brazil

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