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  • 1
    Electronic Resource
    Electronic Resource
    Nature; 370.1994, 6490, S.549-552 (1994)
    [s.l.] : Nature Publishing Group
    Nature 370 (1994), S. 549-552 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Sediment was collected with a box corer from the upper continental slope of the Washington coast, USA (46° 45.02' N, 124° 59.87 W; water depth 647m) in August 1993. The core was kept at 2 °C until sectioned (96 h) under N2 into 0.5- (top 2 cm) or 1.0-cm slices. 210Pb profiles of a ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/370549a0
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    Paper (German National Licenses)
    Fulltext
  • 2
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    14C Blank Assessment in Small-Scale Compound-Specific Radiocarbon Analysis of Lipid Biomarkers and Lignin Phenols (2020)
    Cambridge Univ. Press
    In:  Radiocarbon, 62 (1). pp. 207-218.
    Details
    Publication Date: 2021-05-04
    Description: Compound-specific radiocarbon (14C) dating often requires working with small samples of 〈 100 µg carbon (µgC). This makes the radiocarbon dates of biomarker compounds very sensitive to biases caused by extraneous carbon of unknown composition, a procedural blank, which is introduced to the samples during the steps necessary to prepare a sample for radiocarbon analysis by accelerator mass spectrometry (i.e., isolating single compounds from a heterogeneous mixture, combustion, gas purification and graphitization). Reporting accurate radiocarbon dates thus requires a correction for the procedural blank. We present our approach to assess the fraction modern carbon (F14C) and the mass of the procedural blanks introduced during the preparation procedures of lipid biomarkers (i.e. n-alkanoic acids) and lignin phenols. We isolated differently sized aliquots (6–151 µgC) of n-alkanoic acids and lignin phenols obtained from standard materials with known F14C values. Each compound class was extracted from two standard materials (one fossil, one modern) and purified using the same procedures as for natural samples of unknown F14C. There is an inverse linear relationship between the measured F14C values of the processed aliquots and their mass, which suggests constant contamination during processing of individual samples. We use Bayesian methods to fit linear regression lines between F14C and 1/mass for the fossil and modern standards. The intersection points of these lines are used to infer F14Cblank and mblank and their associated uncertainties. We estimate 4.88 ± 0.69 μgC of procedural blank with F14C of 0.714 ± 0.077 for n-alkanoic acids, and 0.90 ± 0.23 μgC of procedural blank with F14C of 0.813 ± 0.155 for lignin phenols. These F14Cblank and mblank can be used to correct AMS results of lipid and lignin samples by isotopic mass balance. This method may serve as a standardized procedure for blank assessment in small-scale radiocarbon analysis.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1017/RDC.2019.108
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 3
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    Mass, inverse of mass, uncertainty in inverse of mass, F14C value and uncertainty in F14C value of standard compounds used for 14C blank assessment in compound-specific radiocarbon analysis of lipid biomarkers and lignin phenols (2020)
    PANGAEA
    Details
    Publication Date: 2023-04-22
    Description: Compound-specific radiocarbon dating often requires working with small samples of 〈 100 µg carbon (µgC). This makes the radiocarbon dates of biomarker compounds very sensitive to biases caused by extraneous carbon of unknown composition, a procedural blank, which is introduced to the samples during the steps necessary to prepare a sample for radiocarbon analysis by accelerator mass spectrometry (i.e., isolating single compounds from a heterogeneous mixture, combustion, gas purification and graphitization). Reporting accurate radiocarbon dates thus requires a correction for the procedural blank. We present our approach to assess the fraction modern carbon (F14C) and the mass of the procedural blanks introduced during the preparation procedures of lipid biomarkers (i.e. n-alkanoic acids) and lignin phenols. We isolated differently sized aliquots (6-151 µgC) of n-alkanoic acids and lignin phenols obtained from standard materials with known F14C values. Each compound class was extracted from two standard materials (one fossil, one modern) and purified using the same procedures as for natural samples of unknown F14C. There was an inverse linear relationship between the measured F14C values of the processed aliquots and their mass, which suggests constant contamination during processing of individual samples. We used Bayesian methods to fit linear regression lines between F14C and 1/mass for the fossil and modern standards. The intersection points of these lines were used to infer F14Cblank and mblank and their associated uncertainties. We estimated 4.88±0.69 μgC of procedural blank with F14C of 0.714±0.077 for n-alkanoic acids, and 0.90±0.23 μgC of procedural blank with F14C of 0.813±0.155 for lignin phenols. These F14Cblank and mblank can be used to correct AMS results of lipid and lignin samples by isotopic mass balance. This method may serve as a standardized procedure for blank assessment in small-scale radiocarbon analysis.
    Keywords: AWI_Envi; Center for Marine Environmental Sciences; MARUM; Polar Terrestrial Environmental Systems @ AWI
    Type: Dataset
    Format: application/zip, 2.5 MBytes
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    DATA PANGAEA
  • 4
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    Mass and F14C values of standard compounds for the blank assessment for n-alkanoic acid methyl ester and lignin phenols (2020)
    PANGAEA
    Details
    Publication Date: 2023-04-22
    Keywords: AWI_Envi; Compounds; Event label; Fraction modern carbon; Fraction modern carbon, standard deviation; Laboratory code/label; Mass; Mass, standard deviation; Messel_oil_shale; Messel, Germany; OUTCROP; Outcrop sample; Polar Terrestrial Environmental Systems @ AWI; Type
    Type: Dataset
    Format: text/tab-separated-values, 205 data points
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    DATA PANGAEA
  • 5
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    Mineralogical characteristics, TOC-based properties and terrestrial component loadings in two river-marginal sea systems (2019)
    PANGAEA
    In:  Supplement to: Hou, Pengfei; Yu, Meng; Zhao, Meixun; Montluçon, Daniel; Su, Chenglong; Eglinton, Timothy Ian (2020): Terrestrial Biomolecular Burial Efficiencies on Continental Margins. Journal of Geophysical Research: Biogeosciences, 125(8), https://doi.org/10.1029/2019JG005520
    Details
    Publication Date: 2024-03-01
    Description: This dataset includes mineralogical characteristics (surface area and mean grain size), TOC-based properties (TOC% and TOC-δ13C) and terrestrial component loadings (terrestrial organic carbon, long-chain n-alkanes and n-fatty acids (n-FAs)) in riverine suspended particulate matter (SPM) and coastal surface sediments of the Pearl River-northern South China Sea and the Yellow River-Bohai Sea/Yellow Sea.
    Keywords: BS/YS-S_B04; BS/YS-S_B25; BS/YS-S_B36; BS/YS-S_B67; BS/YS-S_B71; BS/YS-S_BS5; BS/YS-S_H02; Carbon, organic, terrestrial, deposition; Carbon, organic, total; China; Core; CORE; Distance; Event label; Grain Size; Grain size, mean; Latitude of event; Longitude of event; Mass; Minerals, surface area; n-Alkane, deposition; n-fatty acids, deposition; PRE-S_A01; PRE-S_A03; PRE-S_A04; PRE-S_A06; PRE-S_A09; PRE-S_F401; PRE-S_P03; PRE-S_P06; PR-SPM_PR1-Apr; PR-SPM_PR1-Nov; PR-SPM_PR1-Sep; Sample ID; SCS-S_E1; SCS-S_F1; SCS-S_G1; SCS-S_G2; Station label; TOC; YR-SPM_20110628; YR-SPM_20110922; YR-SPM_20111117; YR-SPM_20120113; YR-SPM_20120422; YR-SPM_20120619; YR-SPM_20120627; YR-SPM_20121013; YR-SPM_20130104; YR-SPM_20130428; YR-SPM_20130619; YR-SPM_20130704; YR-SPM_20150604; YR-SPM_20150709; YR-SPM_20150804; YR-SPM_20151124; YR-SPM_20160121; YR-SPM_20160507; δ13C, organic carbon
    Type: Dataset
    Format: text/tab-separated-values, 421 data points
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    DATA PANGAEA
  • 6
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    Biogeochemical properties of sinking particles intercepted at three depths on the NW Atlantic margin (2012)
    PANGAEA
    Details
    Publication Date: 2024-04-20
    Description: Three conical sediment were deployed at three depths 968 m (top trap), 1976 m (middletrap), and 2938 m (50mabove the bottom, bottom trap) - from June 27, 2004 to April 27, 2005 on the NW Atlantic margin at a water depth of 2988 m. The sediment trap carousels were programmed to open each collection cup for 23.4 days for the top trap and 14.5 days for the other two traps, resulting in total 13 samples from the top trap and 21 samples each from the middle and bottom traps. The samples were analyzed for the biogeochemical properties with various methods. Frequent occurrences of higher fluxes in deep relative to shallower sediment traps and low delta 14C values of sinking POC together provide strong evidence for significant lateral transport of aged organic matter over the margin. Comparison of biogeochemical properties such as aluminum concentration and flux, and iron concentration between samples intercepted at different depths shows that particles collected by the deepest trap had more complex sources than the shallower ones. These data also suggest that at least two modes of lateral transport exist over the New England margin. Based on radio carbon mass balance, about 30% (± 10%) of sinking POC in all sediment traps is estimated to be derived from lateral transport of re-suspended sediment. A strong correlation between delta 14C values and aluminum concentrations suggests that the aged organic matter is associated with lithogenic particles.
    Keywords: Aluminium; Aluminium, flux; Atlantic; Biogenic silica, opal/calcium carbonate ratio; Calcium; Calcium carbonate; Carbon, inorganic, particulate; Carbon, organic, particulate; Carbon, organic, particulate, flux; Carbon, organic/Nitrogen, total ratio; Carbon, total; DATE/TIME; Date/time end; DEPTH, water; Duration, number of days; Event label; Fatty acids; Flux of total mass; Iron; Lithogenic material; Nitrogen, total; NWAtlantic_04-05_TRAPS; Opal, biogenic silica; Organic matter, particulate; Sample code/label; see reference(s); Silicon; Trap, sediment; TRAPS; Treatment; Δ14C; δ13C, organic carbon
    Type: Dataset
    Format: text/tab-separated-values, 1261 data points
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    DATA PANGAEA
  • 7
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    14C Blank Assessment in Small-Scale Compound-Specific Radiocarbon Analysis of Lipid Biomarkers and Lignin Phenols (2020)
    In:  EPIC3Radiocarbon, 62(1), pp. 207-218, ISSN: 0033-8222
    Details
    Publication Date: 2021-06-21
    Description: Compound-specific radiocarbon (14C) dating often requires working with small samples of 〈 100 μg carbon (μgC). This makes the radiocarbon dates of biomarker compounds very sensitive to biases caused by extraneous carbon of unknown composition, a procedural blank, which is introduced to the samples during the steps necessary to prepare a sample for radiocarbon analysis by accelerator mass spectrometry (i.e., isolating single compounds from a heterogeneous mixture, combustion, gas purification and graphitization). Reporting accurate radiocarbon dates thus requires a correction for the procedural blank. We present our approach to assess the fraction modern carbon (F14C) and the mass of the procedural blanks introduced during the preparation procedures of lipid biomarkers (i.e. n-alkanoic acids) and lignin phenols. We isolated differently sized aliquots (6–151 μgC) of n-alkanoic acids and lignin phenols obtained from standard materials with known F14C values. Each compound class was extracted from two standard materials (one fossil, one modern) and purified using the same procedures as for natural samples of unknown F14C. There is an inverse linear relationship between the measured F14C values of the processed aliquots and their mass, which suggests constant contamination during processing of individual samples. We use Bayesian methods to fit linear regression lines between F14C and 1/mass for the fossil and modern standards. The intersection points of these lines are used to infer F14Cblank and mblank and their associated uncertainties. We estimate 4.88 ± 0.69 μgC of procedural blank with F14C of 0.714 ± 0.077 for n-alkanoic acids, and 0.90 ± 0.23 μgC of procedural blank with F14C of 0.813 ± 0.155 for lignin phenols. These F14Cblank and mblank can be used to correct AMS results of lipid and lignin samples by isotopic mass balance. This method may serve as a standardized procedure for blank assessment in small-scale radiocarbon analysis.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
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    PAPER (OA)
  • 8
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    High-sensitivity measurement of diverse vascular plant-derived biomarkers in high-altitude ice cores (2010)
    American Geophysical Union
    Details
    Publication Date: 2022-05-25
    Description: Author Posting. © American Geophysical Union, 2009. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Geophysical Research Letters 36 (2009): L13501, doi:10.1029/2009GL037643.
    Description: Semi-volatile organic compounds derived from burned and fresh vascular plant sources and preserved in high-altitude ice fields were detected and identified through use of recently developed analytical tools. Specifically, stir bar sorptive extraction and thermal desorption coupled with gas chromatography/time-of-flight mass spectrometry allowed measurement of multiple biomarkers in small sample volumes (≤30 ml). Among other compounds of interest, several diterpenoids, which suggest inputs from conifers and conifer burning, were identified in post-industrial era and older Holocene ice from the Sajama site in the Bolivian Andes, but not in a glacial period sample, consistent with aridity changes. Differences in biomarker assemblages between sites support the use of these compounds as regionally constrained recorders of vegetation and climate change. This study represents the first application of these analytical techniques to ice core research and the first indication that records of vegetation fires may be reconstructed from diterpenoids in ice.
    Description: This project was supported in part by NSF-OCE (0402533), and NSF-EAR (0094475).
    Keywords: Biomass burning ; Molecular markers
    Repository Name: Woods Hole Open Access Server
    Type: Article
    Format: application/postscript
    Format: application/pdf
    Format: text/plain
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  • 9
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    Radiocarbon dating of alkenones from marine sediments : II. Assessment of carbon process blanks (2011)
    Dept. of Geosciences, University of Arizona
    Details
    Publication Date: 2022-05-25
    Description: Author Posting. © Arizona Board of Regents on behalf of the University of Arizona, 2005. This article is posted here by permission of Dept. of Geosciences, University of Arizona for personal use, not for redistribution. The definitive version was published in Radiocarbon 47 (2005): 413-424.
    Description: We evaluate potential process blanks associated with radiocarbon measurement of microgram to milligram quantities of alkenones at the National Ocean Sciences Accelerator Mass Spectrometry (NOSAMS) facility. Two strategies to constrain the contribution of blanks to alkenone 14C dates were followed: 1) dating of samples of known age and 2) multiple measurements of identical samples. We show that the potential contamination associated with the procedure does not lead to a systematic bias of the results of alkenone dating to either younger or older ages. Our results indicate that alkenones record Δ14C of ambient DIC with an accuracy of approximately 10‰. A conservative estimate of measurement precision is 17‰ for modern samples. Alkenone 14C ages are expected to be reliable within 500 yr for samples younger than 10,500 14C yr.
    Description: This research was funded by NSF grant # OCE-0327405 and DFG project # SCHN621 and a WHOI-NOSAMS postdoctoral scholarship to GM.
    Repository Name: Woods Hole Open Access Server
    Type: Article
    Format: application/pdf
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  • 10
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    Tracing river chemistry in space and time : dissolved inorganic constituents of the Fraser River, Canada (2014)
    Details
    Publication Date: 2022-05-25
    Description: Author Posting. © The Author(s), 2013. This is the author's version of the work. It is posted here by permission of Elsevier for personal use, not for redistribution. The definitive version was published in Geochimica et Cosmochimica Acta 124 (2014): 283-308, doi:10.1016/j.gca.2013.09.006.
    Description: The Fraser River basin in southwestern Canada bears unique geologic and climatic features which make it an ideal setting for investigating the origins, transformations and delivery to the coast of dissolved riverine loads under relatively pristine conditions. We present results from sampling campaigns over three years which demonstrate the lithologic and hydrologic controls on fluxes and isotope compositions of major dissolved inorganic runoff constituents (dissolved nutrients, major and trace elements, 87Sr/86Sr, δD). A time series record near the Fraser mouth allows us to generate new estimates of discharge-weighted concentrations and fluxes, and an overall chemical weathering rate of 32 t km-2 y-1. The seasonal variations in dissolved inorganic species are driven by changes in hydrology, which vary in timing across the basin. The time series record of dissolved 87Sr/86Sr is of particular interest, as a consistent shift between higher (“more radiogenic”) values during spring and summer and less radiogenic values in fall and winter demonstrates the seasonal variability in source contributions throughout the basin. This seasonal shift is also quite large (0.709 – 0.714), with a discharge-weighted annual average of 0.7120 (2 s.d. = 0.0003). We present a mixing model which predicts the seasonal evolution of dissolved 87Sr/86Sr based on tributary compositions and water discharge. This model highlights the importance of chemical weathering fluxes from the old sedimentary bedrock of headwater drainage regions, despite their relatively small contribution to the total water flux.
    Description: This work was supported by the WHOI Academic Programs Office and MIT PAOC Houghton Fund to BMV, a WHOI Arctic Research Initiative grant to ZAW, NSF-ETBC grant OCE-0851015 to BPE and TIE, and NSF grant EAR-1226818 to BPE.
    Repository Name: Woods Hole Open Access Server
    Type: Preprint
    Format: application/pdf
    Format: application/vnd.ms-excel
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