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  • 1
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    Unknown
    PANGAEA
    In:  Supplement to: Thiagarajan, Nivedita; Gerlach, Dana; Roberts, Mark L; Burke, Andrea; McNichol, Ann P; Jenkins, William J; Subhas, Adam V; Tresher, Ronald E; Adkins, Jess F (2013): Movement of deep-sea coral populations on climatic timescales. Paleoceanography, 28(2), 227-236, https://doi.org/10.1002/palo.20023
    Publication Date: 2023-01-13
    Description: During the past 40,000 years, global climate has moved into and out of a full glacial period, with the deglaciation marked by several millennial-scale rapid climate change events. Here we investigate the ecological response of deep-sea coral communities to both glaciation and these rapid climate change events. We find that the deep-sea coral populations of Desmophyllum dianthus in both the North Atlantic and the Tasmanian seamounts expand at times of rapid climate change. However, during the more stable Last Glacial Maximum, the coral population globally retreats to a more restricted depth range. Holocene populations show regional patterns that provide some insight into what causes these dramatic changes in population structure. The most important factors are likely responses to climatically driven changes in productivity, [O2] and [CO3]2-.
    Type: Dataset
    Format: application/zip, 2 datasets
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  • 2
    Publication Date: 2023-03-03
    Keywords: Age, 14C AMS; Age, 14C calibrated; Age, dated; Age, dated standard deviation; ALV-3884; ALV-3885; ALV-3887; ALV-3889; ALV-3890; ALV-3891; ALV-4162; ALVIN; Area/locality; AT07-35; AT12-01; Atlantis (1997); Calendar age; Comment; Corner Rise; Depth, bathymetric; DEPTH, sediment/rock; Event label; Latitude of event; Longitude of event; New England Mountains; RBDASS05; Remote operated vehicle; ROV; Sample code/label; Sample ID; Submersible Alvin
    Type: Dataset
    Format: text/tab-separated-values, 880 data points
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  • 3
    Publication Date: 2023-09-15
    Keywords: Age, 14C AMS; Age, 14C calibrated; Age, dated; Age, dated standard deviation; Area/locality; Calendar age; Depth, bathymetric; DEPTH, sediment/rock; Event label; Latitude of event; Longitude of event; Remote operated vehicle Jason II; ROVJ; Sample code/label; Sample ID; Tasman Sea; Thomas G. Thompson; TN228; TN228_J2_383; TN228_J2_384; TN228_J2_385; TN228_J2_386; TN228_J2_387; TN228_J2_389; TN228_J2_390; TN228_J2_392; TN228_J2_393; TN228_J2_395
    Type: Dataset
    Format: text/tab-separated-values, 1071 data points
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  • 4
    Publication Date: 2022-05-25
    Description: Author Posting. © Arizona Board of Regents on behalf of the University of Arizona, 2010. 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 52 (2010): 717-726.
    Description: The article reports the first radiocarbon dating of a live African baobab (Adansonia digitata L.), by investigating wood samples collected from 2 inner cavities of the very large 2-stemmed Platland tree of South Africa. Some 16 segments extracted from determined positions of the samples, which correspond to a depth of up to 15–20 cm in the wood, were processed and analyzed by accelerator mass spectrometry (AMS). Calibrated ages of segments are not correlated with their positions in the stems of the tree. Dating results indicate that the segments originate from new growth layers, with a thickness of several centimeters, which cover the original old wood. Four new growth layers were dated before the reference year AD 1950 and 2 layers were dated post-AD 1950, in the post-bomb period. Formation of these layers was triggered by major damage inside the cavities. Fire episodes are the only possible explanation for such successive major wounds over large areas or over the entire area of the inner cavities of the Platland tree, able to trigger regrowth.
    Description: This material is based on work supported by a grant from the Romanian National University Research Council (PN II - IDEI 2354 Nr. 1092) and by US National Science Foundation under Cooperative Agreement OCE-022828996.
    Repository Name: Woods Hole Open Access Server
    Type: Article
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  • 5
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    Unknown
    Dept. of Geosciences, University of Arizona
    Publication Date: 2022-05-25
    Description: Author Posting. © Arizona Board of Regents on behalf of the University of Arizona, 2007. 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 49 (2007): 441-445.
    Description: A preliminary determination of the absolute 14C/12C ratio of the oxalic acid I standard (NBS SRM 4990B) has been made. Using an accelerator mass spectrometry (AMS) system, a known number of radiocarbon ions were implanted in a thin copper foil. The foil was then combusted with the addition of 14C-free carrier material. This resulting gas (which had a known 14C/12C ratio) was graphitized and compared to OX-I material. This comparison yielded an absolute 14C/12C ratio of OX-I. The absolute 14C/12C ratio of OX-I, coupled with knowledge of the specific activity of OX-1, provides an alternative determination of the 14C half-life.
    Repository Name: Woods Hole Open Access Server
    Type: Article
    Format: application/pdf
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  • 6
    Publication Date: 2022-05-25
    Description: Author Posting. © The Author(s), 2015. 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 159 (2015): 126-138, doi:10.1016/j.gca.2015.03.009.
    Description: Ooids are small, spherical to ellipsoidal grains composed of concentric layers of CaCO3 that could potentially serve as biogeochemical records of the environments in which they grew. Such records, however, must be placed in the proper temporal context. Therefore, we developed a novel acidification system and employed an accelerator mass spectrometer (AMS) with a gas accepting ion source to obtain radiocarbon (14C) chronologies extending radially through ooids within one 8-hour workday. The method was applied to ooids from Highborne Cay, Bahamas and Shark Bay, Australia, yielding reproducible 14C chronologies, as well as constraints on the rates and durations of ooid growth and independent estimates of local 14C reservoir ages.
    Description: This work was financially supported by a National Science Foundation (NSF) grant to RES (OCE-0926372) and a NSF Cooperative Agreement with NOSAMS (OCE-2310753487). Work at MIT was also supported by an award (NNA13AA90A) from the NASA Astrobiology Institute.
    Repository Name: Woods Hole Open Access Server
    Type: Preprint
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  • 7
    Publication Date: 2022-05-25
    Description: Author Posting. © Arizona Board of Regents on behalf of the University of Arizona, 2010. 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 52 (2010): 228-235.
    Description: A new and unique radiocarbon accelerator mass spectrometry (AMS) facility has been constructed at the Woods Hole Oceanographic Institution. The defining characteristic of the new system is its large-gap optical elements that provide a larger-than-standard beam acceptance. Such a system is ideally suited for high-throughput, high-precision measurements of 14C. Details and performance of the new system are presented.
    Repository Name: Woods Hole Open Access Server
    Type: Article
    Format: application/pdf
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  • 8
    Publication Date: 2022-05-25
    Description: Author Posting. © The Author(s), 2010. This is the author's version of the work. It is posted here by permission of Elsevier B.V. for personal use, not for redistribution. The definitive version was published in Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms 269 (2011): 3192–3195, doi:10.1016/j.nimb.2011.04.017.
    Description: The National Ocean Sciences AMS (NOSAMS) facility at Woods Hole Oceanographic Institution has developed a novel, gas-accepting microwave-plasma ion-source. The source is a key component of a compact Accelerator Mass Spectrometry (AMS) system built for the analysis of 14C in a continuously flowing gas stream. The gas source produces carbon currents from a stream of CO2 with currents typical of a traditional graphite source. Details of the gas source, including ion current achieved, optimal flow rate, efficiency, and memory are presented. Additionally, data obtained from coupling a gas chromatograph to the source to will be shown.
    Keywords: Accelerator mass spectrometry ; Gas ion source ; Plasma ion source
    Repository Name: Woods Hole Open Access Server
    Type: Preprint
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  • 9
    Publication Date: 2022-05-25
    Description: Author Posting. © American Geophysical Union, 2013. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Paleoceanography 28 (2013): 227–236, doi:10.1002/palo.20023.
    Description: During the past 40,000 years, global climate has moved into and out of a full glacial period, with the deglaciation marked by several millennial-scale rapid climate change events. Here we investigate the ecological response of deep-sea coral communities to both glaciation and these rapid climate change events. We find that the deep-sea coral populations of Desmophyllum dianthus in both the North Atlantic and the Tasmanian seamounts expand at times of rapid climate change. However, during the more stable Last Glacial Maximum, the coral population globally retreats to a more restricted depth range. Holocene populations show regional patterns that provide some insight into what causes these dramatic changes in population structure. The most important factors are likely responses to climatically driven changes in productivity, [O2] and [CO32–].
    Description: 2013-11-30
    Keywords: Radiocarbon ; Coral ; Glacial
    Repository Name: Woods Hole Open Access Server
    Type: Article
    Format: application/pdf
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  • 10
    Publication Date: 2022-05-25
    Description: Author Posting. © Elsevier B.V., 2008. This is the author's version of the work. It is posted here by permission of Elsevier B.V. for personal use, not for redistribution. The definitive version was published in Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms 266 (2008): 2233-2237, doi:10.1016/j.nimb.2008.03.001.
    Description: The National Ocean Sciences Accelerator Mass Spectrometry (NOSAMS) Facility at Woods Hole Oceanographic Institution is presently completing installation of a novel continuous-flow AMS system. A multi-year development of an AMS microwave gas ion source in collaboration with Atomic Energy Canada Limited (AECL), Chalk River, has preceded this final step of an implementation that is expected to add a new dimension to 14C AMS. National Instruments, NIM, and CAMAC modules have been programmed with LabVIEW on a Windows XP platform to form the basis for data acquisition. In this paper we discuss possible applications and include simulations of expected data acquisition scenarios like real-time AMS analysis of chromatograms. Particular attention is given to issues of synchronization between rapidly changing input amplitudes and signal processing cycles in hardware and software.
    Description: This work is supported by the United States National Science Foundation under Cooperative Agreement OCE-0228996.
    Keywords: Numerical simulation ; Data acquisition - hardware and software ; Accelerator mass spectrometry
    Repository Name: Woods Hole Open Access Server
    Type: Preprint
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