Distribution of selected anthropogenic radionuclides (137Cs, 238Pu, 239,240Pu and 241Am) in marine sediments with emphasis on the Spitsbergen–Bear Island area

Heldal, Hilde Elise; Varskog, Per; Føyn, Lars

doi:10.1016/s0048-9697(02)00041-4

Cited by 37 publications

(17 citation statements)

References 21 publications

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“…The sedimentation rate estimate of R87MC006 from 210 Pb is 80 cm kyr −1 based on the top 5 cm, which is within the ranges of published rates (0.3-1.9 mm yr −1 /30-190 cm kyr −1 ) elsewhere in the Barents Sea (e.g. Heldal et al, 2002;Zaborska et al, 2008;Boitsov et al, 2009;Maiti et al, 2010). The sedimentation rate estimate from an AMS 14 C date at 18.5 cm depth is 4 cm kyr −1 .…”

Section: Pathirana Et Al: Towards An Improved Organic Carbon Budgsupporting

confidence: 85%

“…Figure 3 shows the extended Holocene sediment thickness map and sediment thicknesses calculated for a number of core locations in the western Barents Sea (see Table 1 for sedimentation rates and references). Using these published sedimentation rates, together with other known sediment accumulation rates in the whole Barents Sea (Heldal et al, 2002;Zaborska et al, 2008;Boitsov et al, 2009;Maiti et al, 2010), the amount of sediment accumulated during the past 10 000 yr was calculated. Most calculated sediment thicknesses agree well with the map (Fig.…”

Section: Pathirana Et Al: Towards An Improved Organic Carbon Budgmentioning

confidence: 99%

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Towards an improved organic carbon budget for the western Barents Sea shelf

et al. 2014

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Abstract. There is generally a lack of knowledge on how marine organic carbon accumulation is linked to vertical export and primary productivity patterns in the Arctic Ocean. Despite the fact that annual primary production in the Arctic has increased as a consequence of shrinking sea ice, its effect on flux, preservation, and accumulation of organic carbon is still not well understood. In this study, a multi-proxy geochemical and organic-sedimentological approach is coupled with organic facies modelling, focusing on regional calculations of carbon cycling and carbon burial on the western Barents Shelf between northern Scandinavia and Svalbard. OF-Mod 3-D, an organic facies modelling software tool, is used to reconstruct and quantify the marine and terrestrial organic carbon fractions and to make inferences about marine primary productivity changes across the marginal ice zone (MIZ). By calibrating the model against an extensive set of sediment surface samples, we improve the Holocene organic carbon budget for ice-free and seasonally ice-covered areas in the western Barents Sea. The results show that higher organic carbon accumulation rates in the MIZ are best explained by enhanced surface water productivity compared to ice-free regions, implying that shrinking sea ice may reveal a significant effect on the overall organic carbon storage capacity of the western Barents Sea shelf.

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Section: Pathirana Et Al: Towards An Improved Organic Carbon Budgsupporting

confidence: 85%

Section: Pathirana Et Al: Towards An Improved Organic Carbon Budgmentioning

confidence: 99%

Towards an improved organic carbon budget for the western Barents Sea shelf

et al. 2014

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“…The linearity of this relation for the studied sediments confirms that the influx of organic matter mostly determines PAH levels in 2-3 cm core depth samples at the 12 stations (Fig. 2) (Heldal et al, 2002). Station 136, situated within one of the pockmarks in Ingøydjupet, close to station 153 outside of this pockmark showed a high sedimentation rate, above 4 mm per year, which put a question mark to the quality of this core (see discussion below).…”

Section: Resultssupporting

confidence: 58%

“…1970, 7 years later than the ban on atmospheric nuclear tests (1963), which may be the time required for radioactive fallout deposited on land to reach the sea. However, several other significant inputs of 137 Cs to the environment of the North Atlantic, such as Chernobyl disaster and releases from the Sellafield and La Hague nuclear reprocessing plants, may also contribute to the observed levels (Heldal et al, 2002). The 210 Pb dating of the core from station 85 is thus only tentatively confirmed by the 137 Cs measurements.…”

Section: Resultsmentioning

confidence: 90%

Natural background and anthropogenic inputs of polycyclic aromatic hydrocarbons (PAH) in sediments of South-Western Barents Sea

Boitsov

Jensen

Klungsøyr

2009

Marine Environmental Research

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Please cite this article as: Boitsov, S., Jensen, H.K.B., Klungsøyr, J., Natural background and anthropogenic inputs of polycyclic aromatic hydrocarbons (PAH) in sediments of South-Western Barents Sea, Marine Environmental Research (2009), doi: 10.1016/j.marenvres.2009 This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. ACCEPTED MANUSCRIPT

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“…Several papers reported 137 Cs activity concentrations of 0.5 Bq/kg to 9.3 Bq/kg for surface sediments of southern and central Barents Sea (Føyn and Svaeren, 1997;Nies et al, 1999;Heldal et al, 2002). Smith et al (1995) studied down-core 137 Cs activity concentrations in the eastern Barents Sea.…”

Section: Introductionmentioning

confidence: 99%