TY - JOUR T1 - 14C Blank Corrections for 25–100 μg Samples at the National Ocean Sciences AMS Laboratory JF - Radiocarbon Y1 - 2019 A1 - Roberts, M. L. A1 - Elder, K. L. A1 - Jenkins, W. J. A1 - Gagnon, A. R. A1 - Xu, L. A1 - Hlavenka, J. D. A1 - Longworth, B. E. KW - AMS KW - AMS dating KW - blank corrections AB - Replicate radiocarbon (14C) measurements of organic and inorganic control samples, with known Fraction Modern values in the range Fm = 0–1.5 and mass range 6 μg–2 mg carbon, are used to determine both the mass and radiocarbon content of the blank carbon introduced during sample processing and measurement in our laboratory. These data are used to model, separately for organic and inorganic samples, the blank contribution and subsequently “blank correct” measured unknowns in the mass range 25–100 μg. Data, formulas, and an assessment of the precision and accuracy of the blank correction are presented. VL - 61 SN - 0033-8222, 1945-5755 UR - https://www.cambridge.org/core/journals/radiocarbon/article/14c-blank-corrections-for-25100-g-samples-at-the-national-ocean-sciences-ams-laboratory/494B9CF72445198570213B4A2CC303D0 IS - 5 ER - TY - JOUR T1 - A High-Performance (14)c Accelerator Mass Spectrometry System JF - Radiocarbon Y1 - 2010 A1 - Roberts, M. L. A1 - Burton, J. R. A1 - Elder, K. L. A1 - Longworth, B. E. A1 - McIntyre, C. P. A1 - von Reden, K. F. A1 - Han, B. X. A1 - Rosenheim, B. E. A1 - W. J. Jenkins A1 - Galutschek, E. A1 - McNichol, A. P. AB - 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 (14)C. Details and performance of the new system are presented. VL - 52 IS - 2 N1 - id: 2095; PT: J; CT: 20th International Radiocarbon Conference; CY: MAY 31-JUN 05, 2009; CL: Big Isl, HI; SI: 1; UT: WOS:000285437800005 JO - A High-Performance (14)c Accelerator Mass Spectrometry System ER - TY - JOUR T1 - The Passage of the Bomb Radiocarbon Pulse into the Pacific Ocean JF - Radiocarbon Y1 - 2010 A1 - Jenkins, W. J. A1 - Elder, K. L. A1 - McNichol, A. P. A1 - von Reden, K. KW - AMS KW - antarctic intermediate water KW - anthropogenic co2 KW - atlantic KW - c-14 data KW - carbon KW - distributions KW - graphite KW - south-pacific KW - tritium AB - We report and compare radiocarbon observations made on 2 meridional oceanographic sections along 150 degrees W in the South Pacific in 1991 and 2005. The distributions reflect the progressive penetration of nuclear weapons-produced (14)C into the oceanic thermocline. The changes over the 14 yr between occupations are demonstrably large relative to any possible drift in our analytical standardization. The computed difference field based on the gridded data in the upper 1600 m of the section exhibits a significant decrease over time (approaching 40 to 50 parts per thousand in Delta(14)C) in the upper 200-300 m, consistent with the decadal post-bomb decline in atmospheric (14)C levels. A strong positive anomaly (increase with time), centered on the low salinity core of the Antarctic Intermediate Water (AAIW), approaches 50-60 parts per thousand in Delta(14)C, a clear signature of the downstream evolution of the (14)C transient in this water mass. We use this observation to estimate the transit time of AAIW from its "source region" in the southeast South Pacific and to compute the effective reservoir age of this water mass. The 2 sections show small but significant changes in the abyssal (14)C distributions. Between 1991 and 2005, Delta(14)C has increased by 9 parts per thousand below 2000 m north of 55 degrees S. This change is accompanied overall by a modest increase in salinity and dissolved oxygen, as well as a slight decrease in dissolved silica. Such changes are indicative of greater ventilation. Calculation of "phosphate star" also indicates that this may be due to a shift from the Southern Ocean toward North Atlantic Deep Water as the ventilation source of the abyssal South Pacific. VL - 52 SN - 0033-8222 IS - 3 N1 - Sp. Iss. 2696jo Times Cited:7 Cited References Count:38 JO - Radiocarbon ER - TY - JOUR T1 - WOCE radiocarbon IV: Pacific Ocean results; P10, P13N, P14C, P18, P19 & S4P JF - Radiocarbon Y1 - 2002 A1 - Key, R. M. A1 - Quay, P. D. A1 - Schlosser, P. A1 - McNichol, A. P. A1 - von Reden, K. F. A1 - Schneider, R. J. A1 - Elder, K. L. A1 - Stuiver, M. A1 - Ostlund, H. G. AB - The World Ocean Circulation Experiment, carried out between 1990 and 1997, provided the most comprehensive oceanic survey of radiocarbon to date. Approximately 10,000 samples were collected in the Pacific Ocean by U.S. investigators for both conventional large volume P counting and small volume accelerator mass spectrometry analysis techniques. Results from six cruises are presented. The data quality is as good or better than previous large-scale surveys. The C-14 distribution for the entire WOCE Pacific data set is graphically described using mean vertical profiles and sections, and property-property plots. VL - 44 UR - https://journals.uair.arizona.edu/index.php/radiocarbon/article/view/4097 IS - 1 N1 - 591keTimes Cited:33Cited References Count:56 JO - WOCE radiocarbon IV: Pacific Ocean results; P10, P13N, P14C, P18, P19 & S4P ER - TY - JOUR T1 - Oceanic uptake of CO2 re-estimated through d13C in WOCE samples JF - Nuclear Instruments and Methods in Physics Research Y1 - 2000 A1 - Lerperger, M. A1 - McNichol, A. P. A1 - Peden, J. A1 - Gagnon, A. R. A1 - Elder, K. L. A1 - Kutschera, W. A1 - Rom, W. A1 - Steier, P. VL - B (172) IS - 1-4 N1 - id: 1817 ER - TY - CONF T1 - The radiocarbon gradient at the Antarctic Polar Front T2 - AGU Ocean Sciences Meeting Y1 - 2000 A1 - Schneider, R. J. A1 - McNichol, A. P. A1 - von Reden, K. F. A1 - Elder, K. L. A1 - Gagnon, A. R. A1 - Key, R. M. A1 - Quay, P. D. A1 - Schlosser, P. M. JF - AGU Ocean Sciences Meeting CY - San Antonio, TX N1 - id: 317 ER - TY - CONF T1 - Ten years after - the WOCE AMS radiocarbon program T2 - Accelerator Mass Spectrometer Conference Y1 - 2000 A1 - McNichol, A. P. A1 - Schneider, R. J. A1 - von Reden, K. F. A1 - Gagnon, A. R. A1 - Elder, K. L. A1 - Key, R. M. A1 - Quay, P. D. JF - Accelerator Mass Spectrometer Conference N1 - id: 316 ER - TY - JOUR T1 - Ten years after - The WOCE AMS radiocarbon program JF - Nuclear Instruments & Methods in Physics Research Section B-Beam Interactions with Materials and Atoms Y1 - 2000 A1 - McNichol, A. P. A1 - Schneider, R. J. A1 - von Reden, K. F. A1 - Gagnon, A. R. A1 - Elder, K. L. A1 - Key, R. M. A1 - Quay, P. D. AB - The National Ocean Sciences Accelerator Mass Spectrometry (NOSAMS) Facility is measuring all of the samples collected as part of the US WOCE Program - over 13,000 samples. We designed our extraction lines so that we also measure precise, oceanographically useful delta C-13-Sigma CO2 values. We have completed the analysis of samples from the Pacific and Southern Oceans and are processing those from the Indian Ocean now. At present, this constitutes the world's largest AMS data set. Reviews of the Pacific radiocarbon data are available and demonstrate the increased penetration of the "bomb signal" into the water column since the 1970s. Stable isotope data are being combined with those collected as part of NOAA's Ocean-Atmosphere Carbon Exchange Study to study the ocean's role in the anthropogenic CO2 cycle. The relationship of delta C-13 to other chemical tracers, e.g., PO4, O-2 and chlorofluorocarbons, will further our understanding of basic oceanographic processes. We present preliminary results from these studies as well as investigate the relationship of C-14 to C-13 in the ocean. (C) 2000 Elsevier Science B.V. All rights reserved. VL - 172 IS - 1-4 N1 - 372jrTimes Cited:14Cited References Count:12 JO - Ten years after - The WOCE AMS radiocarbon program ER - TY - JOUR T1 - Evaluating reproducibility of seawater, inorganic and organic carbon 14C results at the National Ocean Sciences AMS Facility (NOSAMS) JF - Radiocarbon Y1 - 1998 A1 - Elder, K. L. A1 - McNichol, A. P.
 A1 - Gagnon, A. R. VL - 40 IS - 1 ER - TY - CONF T1 - High-precision Measurements of 14C as a Circulation Tracer in the Pacific, Indian, and Southern Oceans with Accelerator Mass Spectrometry (AMS) T2 - 8th International Conference on Heavy Ion Accelerator Technology Y1 - 1998 A1 - von Reden, K. F. A1 - Peden, J. C. A1 - Schneider, R. J. A1 - Bellino, M. A1 - Donoghue, J. A1 - Elder, K. L. A1 - Gagnon, A. R. A1 - Long, P. A1 - McNichol, A. P. A1 - Morin, T. A1 - Stuart, D. A1 - Hayes, J. M. A1 - Key, R. M. ED - Shepard, K. American Institute of Physics JF - 8th International Conference on Heavy Ion Accelerator Technology CY - Argonne National Lab N1 - id: 1636 ER - TY - CONF T1 - Reproducibility of seawater, inorganic and organic 14C results at NOSAMS T2 - Sixteenth International 14C Conference Y1 - 1998 A1 - Elder, K. L. A1 - McNichol, A. P. A1 - Gagnon, A. R. JF - Sixteenth International 14C Conference CY - Groningen VL - 40(1) N1 - id: 1625 ER - TY - JOUR T1 - Status Report of the National Ocean Sciences AMS Facility at Woods Hole Oceanographic Institution: Operations and Recent Developments JF - 15th International Conference on the Applications of Accelerators in Research and Industry Y1 - 1998 A1 - Bellino, M. A1 - von Reden, K. F. A1 - Schneider, R. J. A1 - Peden, J. C. A1 - Donoghue, J. A1 - Elder, K. L. A1 - Gagnon, A. R. A1 - Long, P. A1 - McNichol, A. P. A1 - Odegaard, A. P. A1 - Stuart, D. A1 - Handwork, S. A1 - Hayes, J. M. VL - A.I.P. Conference Proceedings IS - 475, part 2 N1 - id: 1647 ER - TY - CONF T1 - AMS measurements of the 14C distribution in the Pacific Ocean T2 - Proceedings of the Seventh International Conference on Accelerator Mass Spectrometry Y1 - 1997 A1 - von Reden, K. F. A1 - McNichol, A. P. A1 - Peden, J. C. A1 - Elder, K. L. A1 - Gagnon, A. R. A1 - Schneider, R. J. ED - Jull, A. J. T. JF - Proceedings of the Seventh International Conference on Accelerator Mass Spectrometry CY - Tucson, AZ VL - B123 N1 - id: 1644; B123 ER - TY - JOUR T1 - AMS measurements of the 14C distribution in the Pacific Ocean JF - Nuclear Instruments and Methods in Physics Research Y1 - 1997 A1 - von Reden, K. F. A1 - McNichol, A. P. A1 - Peden, J. C. A1 - Elder, K. L. A1 - Gagnon, A. R. A1 - Schneider, R. J. VL - B123 N1 - id: 1673 ER - TY - CONF T1 - Evaluating reproducibility of seawater, inorganic and organic carbon 14C results at the National Ocean Sciences AMS Facility (NOSAMS) T2 - 16th International Radiocarbon Conference Y1 - 1997 A1 - Elder, K. L. A1 - McNichol, A. P. A1 - Gagnon, A. R. JF - 16th International Radiocarbon Conference T3 - Book of Abstracts CY - Groningen N1 - id: 956 ER - TY - CONF T1 - Reproducibility of 14C AMS analyses at NOSAMS T2 - 16th International Radiocarbon Conference Y1 - 1997 A1 - Elder, K. L. A1 - Gagnon, A. R. A1 - McNichol, A. P. JF - 16th International Radiocarbon Conference PB - Book of Abstracts CY - Groningen N1 - id: 961 ER - TY - JOUR T1 - Distribution of otoliths in surficial sediments of the U. S. Atlantic continental shelf and slope and potential for reconstructing Holocene fish stocks JF - Paleoceanography Y1 - 1996 A1 - Elder, K. L. A1 - Jones, G. A. A1 - Bolz, G. VL - 11 IS - 3 N1 - id: 1755 ER - TY - JOUR T1 - AMS C14 Dating of the Holocene Climatic Optimum in the North Pacific and Atlantic Oceans JF - EOS,Transactions,American Geophysical Union Y1 - 1994 A1 - Kuzmin, Y. V. A1 - Jones, G. A. A1 - Elder, K. L. VL - 75 IS - 3 N1 - id: 913 JO - AMS C14 Dating of the Holocene Climatic Optimum in the North Pacific and Atlantic Oceans ER - TY - JOUR T1 - Methods for Data Screening, Flagging and Error Analysis at the National-Ocean-Sciences-Ams-Facility JF - Nuclear Instruments & Methods in Physics Research Section B-Beam Interactions with Materials and Atoms Y1 - 1994 A1 - Schneider, R. J. A1 - Jones, G. A. A1 - McNichol, A. P. A1 - vonReden, K. F. A1 - Elder, K. L. A1 - Huang, K. A1 - Kessel, E. D. AB - All data collection, from sample submittal through processing into targets and AMS analysis, is integrated within a large relational database (Sybase). Over 50 tables are linked through key fields. Through structured queries, the information is analysed and presented for a wide variety of applications. Benefits include enhanced quality control, more complete reports to users and more accurate transfer of data among the several laboratories on the network. VL - 92 IS - 1-4 N1 - Nv547Times Cited:14Cited References Count:4 JO - Methods for Data Screening, Flagging and Error Analysis at the National-Ocean-Sciences-Ams-Facility ER - TY - MGZN T1 - Dating the Climatic Optimum with AMS Y1 - 1993 A1 - Elder, K. L. JF - AMS Pulse, The National Ocean Sciences Accelerator Mass Spectrometry Facility Newsletter VL - Spring 1993 N1 - id: 1645 ER - TY - CONF T1 - Methods for data screening, flagging and error analysis at the National Ocean Sciences AMS Facility T2 - 6th International Conference on Accelerator Mass Spectrometry Y1 - 1993 A1 - Schneider, R. J. A1 - Jones, G. A. A1 - McNichol, A. P. A1 - von Reden, K. F. A1 - Elder, K. L. A1 - Kessel, E. D. JF - 6th International Conference on Accelerator Mass Spectrometry CY - Canberra, Australia N1 - id: 933 ER - TY - CONF T1 - The National Ocean Sciences AMS Facility at Woods Hole Oceanographic Institution T2 - 6th International Conference on Accelerator Mass Spectrometry Y1 - 1993 A1 - Jones, G. A. A1 - Schneider, R. J. A1 - von Reden, K. F. A1 - McNichol, A. P. A1 - Gagnon, A. R. A1 - Cohen, G. J. A1 - Osborne, E. A. A1 - Hutton, D. L. A1 - Kessel, E. D. A1 - Elder, K. L. JF - 6th International Conference on Accelerator Mass Spectrometry CY - Canberra, Australia N1 - id: 930 ER - TY - JOUR T1 - The occurrence of extralimital boreal mollusks in West Greenland during the Holocene (abstract) JF - EOS, Transactions, American Geophysical Union Y1 - 1992 A1 - Jones, G. A. A1 - Elder, K. L. VL - 72 IS - 259 N1 - id: 1758 ER - TY - JOUR T1 - Response of G. quinqueloba to Hypsithermal warming in the Norwegian-Greenland Sea (abstract) JF - EOS, Transactions, American Geophysical Union Y1 - 1991 A1 - Jones, G. A. A1 - Elder, K. L. VL - 71 IS - 268 N1 - id: 1759 ER - TY - CONF T1 - Response of the Norwegian-Greenland Sea to Mid-Holocen warming (abstract) T2 - 20th Arctic Workshoip, INSTAAR Y1 - 1991 A1 - Jones, G. A. A1 - Elder, K. L. JF - 20th Arctic Workshoip, INSTAAR CY - Fairbanks, AL N1 - id: 1760 ER -