TY - JOUR T1 - Holocene and recent rates of sediment accumulation in southern Lake Michigan JF - Quaternary Science Reviews Y1 - 2000 A1 - Colman, S. M. A1 - King, J. W. A1 - Jones, G. A. A1 - Reynolds, R. L. A1 - Bothner, M. H. VL - 19 N1 - id: 183 ER - TY - JOUR T1 - An abrupt drowning of the Black Sea shelf JF - Marine Geology Y1 - 1997 A1 - Ryan, W. B. F. A1 - Pitman, W. C. A1 - Major, C. O. A1 - Shimkus, K. A1 - Moskalenko, V. A1 - Jones, G. A. A1 - Dimitrov, P. A1 - Gorur, N. A1 - Sakinc, M. A1 - Yuce, H. AB - During latest Quaternary glaciation, the Black Sea became a giant freshwater lake. The surface of this lake drew down to levels more than 100 m below its outlet. When the Mediterranean rose to the Bosporus sill at 7,150 yr BP1, saltwater poured through this spillway to refill the lake and submerge, catastrophically, more than 100,000 km(2) of its exposed continental shelf. The permanent drowning of a vast terrestrial landscape may possibly have accelerated the dispersal of early neolithic foragers and farmers into the interior of Europe at that time. (C) 1997 Elsevier Science B.V. VL - 138 IS - 1-2 N1 - Xj245Times Cited:283Cited References Count:35 JO - An abrupt drowning of the Black Sea shelf ER - TY - JOUR T1 - Precise temporal correlation of Holocene mollusc shells using sclerochronology JF - Palaeogeography, Paleoclimatology, Paleoecology Y1 - 1997 A1 - Marchitto, T. M. A1 - Jones, G. A. A1 - Goodfriend, G. A. A1 - Weidman, C. R. A1 - Jirikowic, J. N1 - id: 1293 ER - TY - JOUR T1 - AMS radiocarbon analyses from Lake Baikal, Siberia: Challenges of dating sediments from a large, oligotrophic lake JF - Quaternary Science Reviews Y1 - 1996 A1 - Colman, S. M. A1 - Jones, G. A. A1 - Rubin, M. A1 - King, J. W. A1 - Peck, J. A. A1 - Orem, W. H. AB - A suite of 146 new accelerator-mass spectrometer (AMS) radiocarbon ages provides the first reliable chronology for late Quaternary sediments in Lake Baikal. In this large, highly oligotrophic lake, biogenic and authigenic carbonate are absent, and plant macrofossils are extremely rare. Total organic carbon is therefore the primary material available for dating. Several problems are associated with the TOC ages. One is the mixture of carbon sources in TOC, not all of which are syndepositional in age. This problem manifests itself in apparent ages for the sediment surface that are greater than zero. However, because most of the organic carbon in Lake Baikal sediments is algal (autochthonous) in origin, this effect is limited to about 1000+/-500 years, which can be corrected, at least for young deposits. The other major problem with dating Lake Baikal sediments is the very low carbon contents of glacial-age deposits, which makes them extremely susceptible to contamination with modern carbon. This problem can be minimized by careful sampling and handling procedures.The ages show almost an order of magnitude difference in sediment-accumulation rates among different sedimentary environments in Lake Baikal, from about 0.04 mm/year on isolated banks such as Academician Ridge, to nearly 0.3 mm/year in the turbidite depositional areas beneath the deep basin floors, such as the Central Basin. The new AMS ages clearly indicate that the dramatic increase in diatom productivity in the lake, as evidenced by increases in biogenic silica and organic carbon, began about 13 ka, in contrast to previous estimates of 7 ka for the age of this transition. Holocene net sedimentation rates may be less than, equal to, or greater than those in the late Pleistocene, depending on the site. This variability reflects the balance between variable terrigenous sedimentation and increased biogenic sedimentation during interglaciations. The ages reported here, and the temporal and spatial variation in sedimentation rates that they imply, provide opportunities for paleoenvironmental reconstructions at different time scales and resolutions. Published by Elsevier Science Ltd VL - 15 IS - 7 N1 - Vp609Times Cited:112Cited References Count:29 JO - AMS radiocarbon analyses from Lake Baikal, Siberia: Challenges of dating sediments from a large, oligotrophic lake ER - TY - JOUR T1 - Character, paleoenvironment, rate of accumulation, and evidence for seismic triggering of Holocene turbidites, Canada Abyssal Plain, Arctic Ocean JF - Marine Geology Y1 - 1996 A1 - Grantz, A. A1 - Phillips, R. L. A1 - Mullen, M. W. A1 - Starratt, S. W. A1 - Jones, G. A. A1 - Naidu, A. S. A1 - Finney, B. P. AB - Four box cores and one piston core show that Holocene sedimentation on the southern Canada Abyssal Plain for the last 8010 +/- 120 yr has consisted of a continuing rain of pelagic organic and ice-rafted elastic sediment with a net accumulation rate during the late Holocene of less than or equal to 10 mm/1000 yr, and episodically emplaced turbidites 1-5 m thick deposited at intervals of 830 to 3450 yr (average 2000 yr). The average net accumulation rate of the mixed sequence of turbidites and thin pelagite interbeds in the cores is about 1.2 m/1000 yr.Physiography suggests that the turbidites originated on the Mackenzie Delta or its clinoform, and delta(13)C values of -27 to -25 parts per thousand in the turbidites are compatible with a provenance on a delta. Extant displaced neritic and lower slope to basin plain calcareous benthic foraminifers coexist in the turbidite units. Their joint occurence indicates that the turbidites originated on the modern continental shelf and entrained sediment from the slope and rise enroute to their final resting place on the Canada Abyssal Plain. The presence of Middle Pleistocene diatoms in the turbidites suggests, in addition, that the turbidites may have originated in shallow submarine slides beneath the upper slope or outer shelf. Small but consistent differences in organic carbon content and delta(13)C values between the turbidite units suggest that they did not share an identical provenance, which is at least compatible with an origin in slope failures.The primary provenance of the ice-rafted component of the pelagic beds was the glaciated terrane of northwestern Canada; and the provenance of the turbidite units was Pleistocene and Holocene sedimentary deposits on the outer continental shelf and upper slope of the Mackenzie Delta. Largely local derivation of the sediment of the Canada Abyssal Plain indicates that sediment accumulation rates in the Arctic Ocean are valid only for regions with similar depositional sources and processes, and that these rates cannot be extrapolated regionally. The location of an elliptical zone of active seismicity over the inferred provenance of the turbidites suggests that they were triggered by large earthquakes.Distal turbidite sediment accumulation rates were more than two orders of magnitude greater than pelagic sediment accumulation rates on the Canada Abyssal Plain during the last 8000 years. This disparity reconciles the discrepancy between the high accumulation rates assumed by some for the Arctic Ocean because of the numerous major rivers and large ice sheets that discharge into this small mediterranean basin and the low pelagic sedimentation rates that have been reported from the Arctic Ocean. VL - 133 IS - 1-2 N1 - Uy014Times Cited:36Cited References Count:46 JO - Character, paleoenvironment, rate of accumulation, and evidence for seismic triggering of Holocene turbidites, Canada Abyssal Plain, Arctic Ocean 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 - CONF T1 - Evolution of the 14C signal in the surface North Atlantic Ocean T2 - 7th International Conference on Accelerator Mass Spectrometry Abstract Radiocarbon Y1 - 1996 A1 - Weidman, C. R. A1 - Jones, G. A. JF - 7th International Conference on Accelerator Mass Spectrometry Abstract Radiocarbon CY - Tucson, AZ VL - 38 N1 - id: 89; 1 ER - TY - CONF T1 - Stable and radio-carbon isotope measurements in the Pacific Ocean; contributions from NOSAMS Y1 - 1996 A1 - McNichol, A. P. A1 - von Reden, K. F. A1 - Schneider, R. J. A1 - Key, R. M. A1 - Jones, G. A. KW - 02D KW - 07 KW - accelerator mass spectroscopy KW - C-13/C-12 KW - C-14 KW - carbon KW - chemical analysis KW - geochemical indicators KW - high-resolution methods KW - Isotope geochemistry KW - isotope ratios KW - isotopes KW - marine geology KW - mass spectroscopy KW - National Ocean Sciences Accelerator Mass Spectrometry KW - NOSAMS KW - Oceanography KW - Pacific Ocean KW - radioactive isotopes KW - radioactive tracers KW - sampling KW - sea water KW - spectroscopy KW - Stable isotopes KW - tracers KW - Woods Hole Oceanographic Institution PB - American Geophysical Union, Washington, DC, United States (USA) CY - United States (USA) VL - 77 N1 - id: 2240; Source type: conferencepapers&proceedings; Object type: Article; Object type: Conference Paper; Copyright: GeoRef, Copyright 2007, American Geological Institute.; CSAUnique: 1997-047916; AccNum: 1997-047916; ISSN: 0096-3941; CODEN: EOSTAJ ER - TY - CONF T1 - Stable and radiocarbon isotope measurements in the Pacific Ocean: Contributions from NOSAMS T2 - AGU/ASLO 1996 Ocean Sciences Meeting Y1 - 1996 A1 - McNichol, A. P. A1 - von Reden, K. F. A1 - Schneider, R. J. A1 - Key, R. M. A1 - Jones, G. A. JF - AGU/ASLO 1996 Ocean Sciences Meeting CY - San Diego, CA N1 - id: 960 ER - TY - JOUR T1 - WOCE AMS Radiocarbon I: Pacific Ocean results (P6, P16, and P17) JF - Radiocarbon Y1 - 1996 A1 - Key, R. M. A1 - Quay, P. D. A1 - Jones, G. A. A1 - McNichol, A. P. A1 - von Reden, K. F. A1 - Schneider, R. J. AB - AMS radiocarbon results from the World Ocean Circulation Experiment in the Pacific Ocean show dramatic changes in the inventory and distribution of bomb-produced 14C since the time of the GEOSECS survey (8/73-6/74). Nearsurface 4C values for the eastern portion of both the northern and southern subtropical gyres decreased by 25-50%, with the change being greater in the north. Equatorial near-surface values have increased by ca. 25%. Changes in the 250-750-m depth range are dramatically different between the northern and southern basins. The intermediate and mode waters of the southern basin have increased by as much as 75%o since GEOSECS. Waters of similar density in the northern hemisphere are not exposed to the Southern Ocean circulation regime and are significantly less ventilated, showing maximum changes of ca. 50%. VL - 38 UR - https://journals.uair.arizona.edu/index.php/radiocarbon/article/view/1918 IS - 3 N1 - id: 38 JO - WOCE AMS Radiocarbon I: Pacific Ocean results (P6, P16, and P17) ER - TY - JOUR T1 - The Marine Record of Deglaciation from the Continental-Margin Off Nova-Scotia JF - Paleoceanography Y1 - 1995 A1 - Keigwin, L. D. A1 - Jones, G. A. AB - Continental margin sediments off Nova Scotia accumulate at high rates (up to 360 cm kyr(-1)) and contain a history of millennial-scale environmental changes which are dominated by the proximity of the Laurentide ice sheet during the latest Quaternary. Using ratios of oxygen, accelerator mass spectrometer radiocarbon dating, micropaleontology, and sedimentology, we document these changes in six piston cores ranging in water depth from similar to 450 to similar to 4300 m. We find that maximum delta(18)O in N. pachyderma occurred about 15 ka and preceded the maximum abundance of this species in these cores by similar to 1000 years. Between 13 and 14 ka we find a second peak in abundance of N. pachyderma, minimum delta(18)O, and two pulses of ice rafting. The sediment lithology supports terrestrial studies which indicate that there was a general withdrawal of ice beyond the upper Paleozoic and Mesozoic red beds by 14 ka in southeastern Canada, so the ice rafting events between 13 and 14 ka probably reflect ice stream activity in the St. Lawrence valley. The Younger Dryas event is recognized as a peak in abundance of N. pachyderma and ice rafting (dated as similar to 11.3 ka), but meltwater discharge to the Gulf of St. Lawrence was either too small or occurred over too long a time to leave a distinct delta(18)O minium off Nova Scotia. At 7.1 ka, in the middle of Holocene warming, we find a third peak in abundance of N. pachyderma and another delta(18)O minimum but no ice rafting. We interpret these data as evidence of a late-occurring meltwater event which, if correct, could have originated in the Great Lakes, in the Labrador-Ungava region, or in both. The final millennial-scale phenomenon off Nova Scotia is the onset of ''Neoglaciation,'' marked by increased ice rafting and increased % N. pachyderma beginning about 5 kyr ago. VL - 10 IS - 6 N1 - Th675Times Cited:85Cited References Count:77 JO - The Marine Record of Deglaciation from the Continental-Margin Off Nova-Scotia ER - TY - CONF T1 - Using sclerochronology of the mollusc Arctica islandica as a paleoceanographic tool T2 - 5th International Conference on Paleoceanography Y1 - 1995 A1 - Marchitto, T. M. A1 - Jones, G. A. A1 - Goodfriend, G. A. A1 - Weidman, C. R. A1 - Jirikowic, J. JF - 5th International Conference on Paleoceanography CY - Halifax, NS N1 - id: 1294 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 - Application of AMS 14C dating to continental margin sediments off Nova Scotia JF - Eos, Transactions, American Geophysical Union Y1 - 1994 A1 - Keigwin, L. D. A1 - Jones, G. A. VL - 75 IS - 3 N1 - id: 1247 ER - TY - JOUR T1 - The Application of AMS to Organic Geochemistry--Constraints Imposed by Sample Preparation and Machine Operations JF - EOS, Transactions of the American Geophysical Union Y1 - 1994 A1 - McNichol, A. P. A1 - von Reden, K. F. A1 - Schneider, R. J. A1 - Jones, G. A. VL - 75 IS - 3 N1 - id: 1798 ER - TY - JOUR T1 - Automated Sample Processing 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 - Cohen, G. J. A1 - Hutton, D. L. A1 - Osborne, E. A. A1 - vonReden, K. F. A1 - Gagnon, A. R. A1 - McNichol, A. P. A1 - Jones, G. A. AB - The high throughput and high precision requirements for the NOSAMS facility have made it essential to automate many of the stages in sample processing. These automated procedures increase the sample capacity for the lab while reducing errors in sample preparation. Automation has also allowed sample histories to be recorded and saved in Sybase, a relational data base. VL - 92 IS - 1-4 N1 - Nv547Times Cited:9Cited References Count:1 JO - Automated Sample Processing at the National Ocean Sciences Ams Facility ER - TY - JOUR T1 - Comparative-Study of Fe-C Bead and Graphite Target Performance with the National-Ocean-Science-Ams (Nosams) Facility Recombinator Ion-Source JF - Nuclear Instruments & Methods in Physics Research Section B-Beam Interactions with Materials and Atoms Y1 - 1994 A1 - Klinedinst, D. B. A1 - McNichol, A. P. A1 - Currie, L. A. A1 - Schneider, R. J. A1 - Klouda, G. A. A1 - vonReden, K. F. A1 - Verkouteren, R. M. A1 - Jones, G. A. AB - An accelerator mass spectrometry (AMS) experiment was designed to investigate C-14 target performance for two target types over a range of isotopic concentrations and sample sizes, with a special focus on the ability to measure C-14 in environmental samples having only microgram amounts of carbon. The findings were positive, showing that precision, accuracy, and stability were adequate to determine C-14 to 1% or better in samples containing as little as 25 mug carbon. Satisfactory Poisson uncertainty and target stability were demonstrated down to a level of 7 mug carbon, but experimental data showed that accurate measurements at that level require detailed knowledge of blank variability and mass dependence of the modern carbon calibration factor. VL - 92 IS - 1-4 N1 - Nv547Times Cited:23Cited References Count:13 JO - Comparative-Study of Fe-C Bead and Graphite Target Performance with the National-Ocean-Science-Ams (Nosams) Facility Recombinator Ion-Source ER - TY - JOUR T1 - Constraints Imposed by Sample Preparation and Machine Operations JF - EOS, Transactions of the American Geophysical Union Y1 - 1994 A1 - McNichol, A. P. A1 - von Reden, K. F. A1 - Schneider, R. J. A1 - Jones, G. A. VL - 75 IS - 3 N1 - id: 937 ER - TY - CONF T1 - Do AMS measurements approach a Gaussian distribution? T2 - 15th International Radiocarbon Conference Y1 - 1994 A1 - Jirikowic, J. L. A1 - Schneider, R. J. A1 - von Reden, K. F. A1 - Jones, G. A. JF - 15th International Radiocarbon Conference CY - Glasgow, Scotland N1 - id: 940 ER - TY - JOUR T1 - High Precision Sea Water 14C Analyses at the National Ocean Sciences AMS Facility JF - EOS, Transactions of the American Geophysical Union Y1 - 1994 A1 - von Reden, K. F. A1 - Jones, G. A. A1 - Schneider, R. J. A1 - McNichol, A. P. VL - 75 IS - 3 N1 - id: 939 ER - TY - CONF T1 - High-latitude ocean radiocarbon time histories from AMS-dating of long-lived molluscs T2 - AGU Ocean Sciences Meeting Y1 - 1994 A1 - Weidman, C. R. A1 - Jones, G. A. JF - AGU Ocean Sciences Meeting CY - San Diego, CA N1 - id: 90 ER - TY - JOUR T1 - High-precision AMS radiocarbon measurements of central Arctic Ocean seawaters JF - Nuclear Instruments and Methods in Physics Research Y1 - 1994 A1 - Jones, G. A. A1 - Gagnon, A. R. A1 - Schneider, R. J. A1 - von Reden, K. F. A1 - McNichol, A. P. VL - B92 N1 - id: 52 ER - TY - JOUR T1 - High-precision sea water 14C analyses by accelerator mass spectrometry. 15th International Radiocarbon Conference, Glasgow, Scotland, August 15-19 JF - EOS, Transactions of the American Geophysical Union Y1 - 1994 A1 - von Reden, K. F. A1 - Jones, G. A. A1 - Schneider, R. J. A1 - McNichol, A. P. VL - 75 IS - 3 N1 - id: 941 ER - TY - JOUR T1 - Internal and External Checks in the Nosams Sample Preparation Laboratory for Target Quality and Homogeneity JF - Nuclear Instruments & Methods in Physics Research Section B-Beam Interactions with Materials and Atoms Y1 - 1994 A1 - Osborne, E. A. A1 - McNichol, A. P. A1 - Gagnon, A. R. A1 - Hutton, D. L. A1 - Jones, G. A. AB - In the NOSAMS sample preparation laboratory (SPL) we have developed rigorous internal procedures aimed at ensuring that sample preparation introduces as little error into our analyses as possible and identifying problems rapidly. Our three major CO2 preparation procedures are: stripping inorganic carbon from seawater, hydrolyzing CaCO3, and oxidizing organic matter. For seawater, approximately 10% of our analyses are standards or blanks which we use to demonstrate extraction of virtually all the inorganic carbon. Analysis of the stable carbon isotopic composition of the CO2 extracted from our standards indicates a precision of better than 0.15-0.20 parts per thousand. We also routinely process C-14-free CO2 in our stripping lines to demonstrate the absence of a significant process-dependent blank. For organic combustions and CaCO3 hydrolyses, we use the carbon yield (% organic carbon (OC) or % CaCO3 by weight) as a check on our sample procedures. We have analyzed the blank contribution of these procedures as a function of sample size. Our organic carbon blank is constant at approximately 0.4% modem for samples containing greater than 1 mg C and our carbonate blank is less than 0.2% modern for samples containing more than 0.5 mg C. We use a standard Fe/H-2 catalytic reduction to prepare graphite from CO2. We check the completeness of our reactions with the pressure data stored during the reaction as well as use a robot to determine a gravimetric yield. All graphite undergoes a visual inspection and is rejected if any heterogeneities are present. We have recombusted graphite made from CO2 with deltaC-13 values ranging from -42 to 1 parts per thousand and determined that the deltaC-13 of the recombusted carbon agrees with that from the pure gas to within 0.05 parts per thousand, demonstrating little or no fractionation during the treatment of the sample. The deltaC-13 we measure on the CO2 generated from more than 75% of our samples is compared to the deltaC-13 measured on the AMS as a further check of our procedures. As further external checks, we analyzed the International Atomic Energy Association (IAEA) samples during the establishment of our laboratory and are presently participating in the third international radiocarbon intercalibration (TIRI) exercise. VL - 92 IS - 1-4 N1 - Nv547Times Cited:14Cited References Count:5 JO - Internal and External Checks in the Nosams Sample Preparation Laboratory for Target Quality and Homogeneity ER - TY - JOUR T1 - Lake-Level History of Lake-Michigan for the Past 12,000 Years - the Record from Deep Lacustrine Sediments JF - Journal of Great Lakes Research Y1 - 1994 A1 - Colman, S. M. A1 - Forester, R. M. A1 - Reynolds, R. L. A1 - Sweetkind, D. S. A1 - King, J. W. A1 - Gangemi, P. A1 - Jones, G. A. A1 - Keigwin, L. D. A1 - Foster, D. S. KW - lake michigan KW - ostracodes KW - radiocarbon KW - sedimentology KW - sediments KW - southern AB - Collection and analysis of an extensive set of seismic-reflection profiles and cores from southern Lake Michigan have provided new data that document the history of the lake basin for the past 12,000 years. Analyses of the seismic data, together with radiocarbon dating, magnetic, sedimentologic, isotopic, and paleontologic studies of core samples, have allowed us to reconstruct lake-level changes during this recent part of the lake's history.The post-glacial history of lake-level changes in the Lake Michigan basin begins about 11.2 ka with the fall from the high Calumet level, caused by the retreat of the Two Rivers glacier, which had blocked the northern outlet of the lake. This lake-level fall was temporarily reversed by a major influx of water from glacial Lake Agassiz (about 10.6 ka), during which deposition of the distinctive gray Wilmette Bed of the Lake Michigan Formation interrupted deposition of red glaciolacustrine sediment. Lake level then continued to fall, culminating in the opening of the North Bay outlet at about 10.3 ka. During the resulting Chippewa low phase, lake level was about 80 m lower than it is today in the southern basin of Lake Michigan. The rise of the early Holocene lake level, controlled primarily by isostatic rebound of the North Bay outlet, resulted in a prominent, planar, transgressive unconformity that eroded most of the shoreline features below present lake level. Superimposed on this overall rise in lake level, a second influx of water from Lake Agassiz temporarily raised lake levels an unknown amount about 9.1 ka. At about 7 ka, lake level may have fallen below the level of the outlet because of sharply drier climate. Sometime between 6 and 5 ka, the character of the lake changed dramatically, probably due mostly to climatic causes, becoming highly undersaturated with respect to calcium carbonate and returning primary control of lake level to the isostatically rising North Bay outlet. Post-Nipissing (about 5 ka) lake level has fallen about 6 m due to erosion of the Port Huron outlet, a trend around which occurred relatively small (+/- approximately 2 m), short-term fluctuations controlled mainly by climatic changes. These cyclic fluctuations are reflected in the sedimentological and sediment-magnetic properties of the sediments. VL - 20 SN - 0380-1330 IS - 1 N1 - Nl348Times Cited:47 Cited References Count:29 JO - J Great Lakes Res ER - TY - JOUR T1 - Latest Quaternary Sedimentation in the Kerch Strait Area of the Black Sea Shelf: Response to Glacial Sea Level Fluctuation JF - EOS,Transactions,American Geophysical Union Y1 - 1994 A1 - Major, C. O. A1 - Ryan, W. B. F. A1 - Pitman, W. C., III A1 - Shimkus, K. M. A1 - Jones, G. A. A1 - O'Connell, S. VL - 75 IS - 16 N1 - id: 914 ER - TY - JOUR T1 - The limnological and climate history of Lake Michigan from ostracode, stable-isotope, and magnetic susceptibility records JF - Journal of Great Lakes Research Y1 - 1994 A1 - Forester, R. M. A1 - Colman, S. M. A1 - Reynolds, R. L. A1 - Jones, G. A. A1 - Keigwin, L. D. A1 - Foster, D. S. VL - 20 N1 - id: 1358 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 - JOUR T1 - The National Ocean Sciences Accelerator Mass Spectrometry Facility: Recent Developments JF - EOS, Transactions of the American Geophysical Union Y1 - 1994 A1 - Schneider, R. J. A1 - Jones, G. A. A1 - von Reden, K. F. A1 - McNichol, A. P. VL - 75 IS - 3 N1 - id: 938 ER - TY - JOUR T1 - Optimized Data Analysis for AMS Radiocarbon Dating JF - Nuclear Instruments & Methods in Physics Research Section B - Beam Interactions with Materials and Atoms Y1 - 1994 A1 - Séguin, F. H. A1 - Schneider, R. J. A1 - Jones, G. A. A1 - von Reden, K. F. VL - 92 SN - 0168-583X IS - 1-4 N1 - id: 1617; PBS Record: 240; (03) FH Seguin/Mit/Cambridge, MA 02139 USA (42) English Article (44) NV547 ER - TY - JOUR T1 - Performance Characteristics of the 3-MV Tandetron AMS System 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 - von Reden, K. F. A1 - Schneider, R. J. A1 - Cohen, G. J. A1 - Jones, G. A. KW - ACCELERATOR MASS-SPECTROMETER VL - 92 SN - 0168-583X IS - 1-4 N1 - id: 1619; PBS Record: 60; (03) KF Vonreden/Woods Hole Oceanog Inst/Natl Ocean Sci Accelerator/Mass Spectrometry Facil/Woods Hole, MA 02540 USA (42) English Article (44) NV547 ER - TY - JOUR T1 - Radiocarbon Chronology of Black-Sea Sediments JF - Deep-Sea Research Part I-Oceanographic Research Papers Y1 - 1994 A1 - Jones, G. A. A1 - Gagnon, A. R. AB - Accelerator Mass Spectrometer (AMS) radiocarbon analyses have been made on 102 samples from 12 sediment cores and 23 samples from two water column profiles. These materials, collected during the first leg of the 1988 joint U.S.-Turkish Black Sea Expedition, provide the most comprehensive radiocarbon chronology of Black Sea sediments vet attempted. Radiocarbon analyses from carefully collected box cores and a molluse shell collected live in 1931 suggest the prebomb surface waters had a DELTAC-14 value of -55 parts per thousand (460 years) and that the maximum detrital correction for radiocarbon ages of Unit I sediments is 580 years for the organic carbon and 260 years for the carbonate fractions. Evidence does not support the 1430-2000 year pre-bomb surface water and/or detrital corrections argued for in past studies. The best estimates for the age of the beginning of the final invasion of the coccolithophore Emiliania huxleyi (Unit 1/2 boundary of Ross and DEGENS, 1974, The Black Sea-geology, chemistry and biology, pp. 183-199) and the age of the first invasion of E. huxleyi (Unit I/II boundary of HAY et al., 1991, Deep-Sea Research, 38, S1211-S1235) are 1635 +/- 60 and 2720 +/- 160 years BP, respectively. Sapropel formation began at approximately 7540 +/- 130 years BP at all depths in the basin, a pattern in disagreement with those predicted by existing time-evolution models of sapropel formation for this basin. Our data suggest that the oxic-anoxic interface has remained relatively stable throughout the Holocene, is controlled largely by the physical oceanography of the basin, and has not evolved as assumed by previous workers. VL - 41 IS - 3 N1 - Nm252Times Cited:121Cited References Count:44 JO - Radiocarbon Chronology of Black-Sea Sediments ER - TY - JOUR T1 - Rapid analysis of seawater samples at the National Ocean Sciences Accelerator Mass Spectrometry Facility, Woods Hole, MA JF - Radiocarbon Y1 - 1994 A1 - McNichol, A. P. A1 - Jones, G. A. A1 - Hutton, D. L. A1 - Gagnon, A. R. A1 - Key, R. M. VL - 36 IS - 2 N1 - id: 305 ER - TY - JOUR T1 - The Rapid Preparation of Seawater Sigma-Co2 for Radiocarbon Analysis at the National Ocean Sciences Ams Facility JF - Radiocarbon Y1 - 1994 A1 - McNichol, A. P. A1 - Jones, G. A. A1 - Hutton, D. L. A1 - Gagnon, A. R. A1 - Key, R. M. KW - accelerator mass-spectrometry KW - C-14 KW - samples AB - We have established a laboratory for extracting Sigma CO2 from seawater samples for AMS analysis of the radiocarbon content. The seawater samples are collected at sea, poisoned and stored until analysis in the laboratory. Each sample is acidified; the inorganic carbon is stripped out as CO2 with an inert carrier gas and then converted to graphite. We present results for Buzzards Bay surface H2O and Na2CO3 standards that demonstrate we strip > 98% of inorganic carbon from seawater. Stable isotope analyses are performed to better than 0.2 parts per thousand, and the reproducibility of C-14 measurements on Buzzards Bay seawater is better than 13 parts per thousand. Finally, we compare data from samples collected in 1991 to those collected in the 1970s and to large volume samples. VL - 36 SN - 0033-8222 IS - 2 N1 - Pz926Times Cited:61 Cited References Count:14 JO - Radiocarbon ER - TY - MGZN T1 - Thermocline Ventilation Rates in the North Pacific Y1 - 1994 A1 - Sonnerup, R. E. A1 - Quay, P. D. A1 - Bullister, J. L. A1 - Key, R. M. A1 - McNichol, A. P. A1 - Jones, G. A. JF - American Geophysical Union, San Francisco N1 - id: 917 ER - TY - JOUR T1 - Tic, Toc, Dic, Doc, Pic, Poc - Unique Aspects in the Preparation of Oceanographic Samples for C-14 Ams JF - Nuclear Instruments & Methods in Physics Research Section B-Beam Interactions with Materials and Atoms Y1 - 1994 A1 - McNichol, A. P. A1 - Osborne, E. A. A1 - Gagnon, A. R. A1 - Fry, B. A1 - Jones, G. A. AB - The radiocarbon content of discrete carbon pools (total (T), dissolved (D), and particulate (P) inorganic (I) and organic (O) carbon (C)) is a useful tracer of carbon cycling within the modem and past ocean. The isolation of different carbon pools in the ocean environment and conversion to CO2 presents unique analytical problems for the radiocarbon chemist. In general, isolation and preparation of inorganic carbon presents few problems; dissolved carbon is easily extracted by acidifying the sample and stripping with an inert gas. Carbon is also readily isolated from particulate carbonate samples; in this case, CO2 is prepared by hydrolysis of the substrate with phosphoric acid. The isolation and preparation of organic carbon presents a much greater problem. Dissolved organic carbon (DOC) must first be isolated from DIC and then oxidized in the presence of very high salt concentrations. We present results from a closed-tube combustion method in which the DIC-free seawater is evaporated to dryness, transferred to a clean combustion tube, and oxidized overnight at 550-degrees-C. Combustion of total organic carbon (TOC) in sediments with a high inorganic carbon content is also difficult. Removal of CaCO3 with acid leaves severely deliquescent salts which, if not thoroughly dried, cause combustion tubes to explode. Removal of the salts by rinsing can also remove significant amounts of organic matter. Finally, we present results from a local coastal region. VL - 92 IS - 1-4 N1 - Nv547Times Cited:82Cited References Count:9 JO - Tic, Toc, Dic, Doc, Pic, Poc - Unique Aspects in the Preparation of Oceanographic Samples for C-14 Ams ER - TY - JOUR T1 - Ams-Graphite Target Production Methods at the Woods-Hole Oceanographic Institution during 1986-1991 JF - Radiocarbon Y1 - 1993 A1 - Gagnon, A. R. A1 - Jones, G. A. KW - accelerator mass-spectrometry KW - facility KW - ocean KW - radiocarbon KW - samples KW - sediments AB - In July 1986, an AMS radiocarbon target preparation laboratory was established at the Woods Hole Oceanographic Institution to produce graphite to be analyzed at the NSF-Accelerator Facility for Radioisotope Analysis at the University of Arizona (Tucson). By June 1991, 923 graphite targets had been prepared and 847 analyzed. Our lab procedures during this time included the careful documentation of weights of all starting samples, catalysts and final graphite yields, as well as the volume of CO2 gas evolved during CaCO3 hydrolysis or closed-tube organic carbon combustions. From these data, we evaluate the methods used in general and in our lab. VL - 35 SN - 0033-8222 IS - 2 N1 - Lg927Times Cited:12 Cited References Count:14 JO - Radiocarbon ER - TY - CONF T1 - Comparative study of Fe-C Bead vs. graphite target performance with the NOSAMS Facility recombinator ion source T2 - 6th International Conference on Accelerator Mass Spectrometry Y1 - 1993 A1 - Kleindinst, D. B. A1 - McNichol, A. P. A1 - Currie, L. A. A1 - Jones, G. A. A1 - Verkouteren, R. M. A1 - von Reden, K. F. A1 - Klouda, G. A. A1 - Schneider, R. J. JF - 6th International Conference on Accelerator Mass Spectrometry CY - Canberra, Australia N1 - id: 931 ER - TY - CONF T1 - Development of the mollusc Artica islandica as a paleoceanographic tool for reconstructing annual and seasonal records of 14C and delta 18O in the mid- to high- latitude North Atlantic Ocean T2 - International Symposium on Applications of Isotope Techniques in the Study of Past and Current Environmental Changes in the Hydrosphere and the Atmosphere Y1 - 1993 A1 - Weidman, C. R. A1 - Jones, G. A. JF - International Symposium on Applications of Isotope Techniques in the Study of Past and Current Environmental Changes in the Hydrosphere and the Atmosphere PB - International Atomic Energy Agency CY - Vienna, Austria VL - SMm-329 N1 - id: 1292 ER - TY - CONF T1 - The high-precision AMS 14C program on seawater at the National Ocean Sciences AMS Facility T2 - European Community Workshop on Development of Ocean Tracer Measurements Y1 - 1993 A1 - von Reden, K. F. A1 - Jones, G. A. A1 - Schneider, R. J. A1 - McNichol, A. P. JF - European Community Workshop on Development of Ocean Tracer Measurements CY - Bremen, Germany N1 - id: 1767 ER - TY - CONF T1 - High-precision AMS radiocarbon measurements of seawater at the National Ocean Sciences AMS Facility T2 - 6th International Conference on Accelerator Mass Spectrometry Y1 - 1993 A1 - Jones, G. A. A1 - Schneider, R. J. A1 - McNichol, A. P. A1 - von Reden, K. F. JF - 6th International Conference on Accelerator Mass Spectrometry CY - Canberra, Australia N1 - id: 929 ER - TY - CONF T1 - Internal and external checks in the NOSAMS Sample Preparation Laboratory for target quality and homogeneity T2 - 6th International Conference on Accelerator Mass Spectrometry Y1 - 1993 A1 - McNichol, A. P. A1 - Gagnon, A. R. A1 - Osborne, E. A. A1 - Hutton, D. L. A1 - Jones, G. A. JF - 6th International Conference on Accelerator Mass Spectrometry CY - Canberra, Australia N1 - id: 958 ER - TY - CONF T1 - Laboratory automation at the National Ocean Sciences AMS Facility T2 - 6th Internation Conference on Accelerator Mass Spectrometry Y1 - 1993 A1 - Cohen, G. J. A1 - Hutton, D. L. A1 - von Reden, K. F. A1 - Osborne, E. A. A1 - McNichol, A. P. A1 - Jones, G. A. JF - 6th Internation Conference on Accelerator Mass Spectrometry CY - Canberra, Australia N1 - id: 927 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 - JOUR T1 - The National Ocean Sciences Accelerator Mass Spectrometry Facility JF - WOCE Notes Y1 - 1993 A1 - Jones, G. A. A1 - McNichol, A. P. A1 - von Reden, K. F. A1 - Schneider, R. J. VL - 5 N1 - id: 1639 ER - TY - CONF T1 - The National Ocean Sciences Accelerator Mass Spectrometry Facility and the WOCE Hydrographic Program. Measurement of 14C in seawater by AMS T2 - Third Scientific Meeting, Oceanography Society Y1 - 1993 A1 - McNichol, A. P. A1 - Jones, G. A. A1 - Schneider, R. J. A1 - von Reden, K. F. A1 - Key, R. M. JF - Third Scientific Meeting, Oceanography Society CY - Seattle, WA VL - 95 N1 - id: 1656 ER - TY - JOUR T1 - The National Ocean Sciences Accelerator Mass Spectrometry Facility (WOCE) JF - WOCE Notes Y1 - 1993 A1 - Jones, G. A. A1 - McNichol, A. P. A1 - von Reden, K. F. A1 - Schneider, R. J. VL - 5 N1 - id: 1651 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 - CONF T1 - The National Ocean Sciences AMS System at Woods Hole Oceanographic Institution T2 - European Community Workshop on Tracers in Physical Oceanography Y1 - 1993 A1 - von Reden, K. F. A1 - Jones, G. A. A1 - Schneider, R. J. A1 - McNichol, A. P. JF - European Community Workshop on Tracers in Physical Oceanography CY - Bremen, Germany N1 - id: 935 ER - TY - CONF T1 - A new high-temporal resolution paleoceanographic tool for the northern North Atlantic: the mollusc Arctica islandica T2 - International Council for the Exploration of the Sea (ICES) Statutory Meeting Y1 - 1993 A1 - Weidman, C. R. A1 - Jones, G. A. JF - International Council for the Exploration of the Sea (ICES) Statutory Meeting CY - Dublin, Ireland VL - 1993/K N1 - id: 1295; 17 ER - TY - CONF T1 - Optimized data analysis for radiocarbon dating T2 - 6th International Conference on Accelerator Mass Spectrometry Y1 - 1993 A1 - Sequin, F. H. A1 - Schneider, R. J. A1 - Jones, G. A. A1 - von Reden, K. F. JF - 6th International Conference on Accelerator Mass Spectrometry CY - Canberra, Australia N1 - id: 934 ER - TY - CONF T1 - Performance characteristics of the 3MV tandetron AMS system at the National Ocean Sciences AMS Facility T2 - 6th International Conference on Accelerator Mass Spectrometry Y1 - 1993 A1 - von Reden, K. F. A1 - Schneider, R. J. A1 - Cohen, G. J. A1 - Jones, G. A. JF - 6th International Conference on Accelerator Mass Spectrometry CY - Canberra, Australia N1 - id: 936 ER - TY - JOUR T1 - Radiocarbon ages from two submerged strandline features in the western Gulf of Maine and a sea-level curve for the northeastern Massachusetts coastal region JF - Quaternary Research Y1 - 1993 A1 - Oldale, R. N. A1 - Colman, S. M. A1 - Jones, G. A. VL - 40 IS - 1 N1 - id: 10 ER - TY - JOUR T1 - Radiocarbon dating of Lake Baikal sediments--A progress report JF - Russian Geology and Geophysics Y1 - 1993 A1 - Colman, S. M. A1 - Kuptsov, V. M. A1 - Jones, G. A. A1 - Carter, S. J. VL - 34 N1 - id: 191 ER - TY - CONF T1 - Radiocarbon time histories from long-lived molluscs using accelerator mass-spectrometry T2 - 6th International Conference on Accelerator Mass Spectrometry Y1 - 1993 A1 - Weidman, C. R. A1 - Jones, G. A. JF - 6th International Conference on Accelerator Mass Spectrometry CY - Sydney, Australia N1 - id: 1296 ER - TY - CONF T1 - Role of the United States National Ocean Sciences Accelerator Mass Spectrometry Facility in Global Climate Change Studies T2 - International Symposium on Applications of Isotope Techniques in Studying Past and Current Environmental Change in the Hydrosphere and the Atmosphere Y1 - 1993 A1 - Jones, G. A. A1 - Schneider, R. J. A1 - von Reden, K. F. A1 - McNichol, A. P. JF - International Symposium on Applications of Isotope Techniques in Studying Past and Current Environmental Change in the Hydrosphere and the Atmosphere CY - Vienna N1 - id: 928 ER - TY - JOUR T1 - A shell-derived time history of bomb 14C on Georges Bank and its Labrador Sea implications JF - Journal of Geophysical Research Y1 - 1993 A1 - Weidman, C. R. A1 - Jones, G. A. AB - Bomb-produced radiocarbon has been used in the past as an important tracer of ocean circulation and as a valuable tool for calculating CO2 air-sea exchange. However, previous studies of the ocean's time-varying bomb 14C record have been confined exclusively to analyzing banded corals, and thus their application has been limited to the lower latitudes. The first time history of bomb 14C from the high-latitude North Atlantic Ocean is obtained from a 54-year-old mollusc specimen, (Bivalvia) Arctica islandica, which was collected live from Georges Bank (41°N) in 1990. The annual growth bands of its shell were analyzed for Δ14C using accelerator mass spectrometry, producing a Δ14C time history from 1939 to 1990. The depleted condition of the Georges Bank bomb 14C signal relative to two coral-derived North Atlantic Δ14C time histories suggests a significant deepwater source for the waters on Georges Bank. Supported by previous work linking the origin of waters on Georges Bank to the Labrador Sea, the Δ14C budget on Georges Bank is modeled as Labrador Sea water, which largely becomes confined to the shelf and partially equilibrates with the atmosphere during a 1-year transit time from the Labrador Sea to Georges Bank. This model is also used to estimate a time history of bomb 14C for the Labrador Sea. Prebomb Δ14C values calculated for the surface Labrador Sea suggest that a greater inventory of bomb 14C has accumulated here than has previously been reported. However, the estimated prebomb average Δ14C (−70.6‰) for this period is nearly identical to the −70‰ previously calculated for the prebomb source of North Atlantic Deep Water and is in agreement with Transient Tracers in the Ocean subsurface tritium data from the central Labrador Sea. Deduced variations in the ventilation and/or 14CO2 uptake rates in the Labrador Sea correspond with observed changes in surface salinity of the Labrador Sea, suggesting a reduction in deepwater formation during the late 1960s and 1970s. VL - 98 IS - C8 N1 - id: 88 JO - A shell-derived time history of bomb 14C on Georges Bank and its Labrador Sea implications ER - TY - JOUR T1 - Accelerator Mass-Spectrometry - Tracking Carbon in the Marine-Environment JF - Oceanus Y1 - 1992 A1 - Schneider, R. J. A1 - Jones, G. A. VL - 35 SN - 0029-8182 IS - 4 N1 - Kl777Times Cited:0 Cited References Count:0 JO - Oceanus ER - TY - CONF T1 - The AMS Accelerator at Woods Hole Oceanographic Institution T2 - Symposium of North Eastern Accelerator Personnel Y1 - 1992 A1 - Schneider, R. J. A1 - von Reden, K. F. A1 - Cohen, G. J. A1 - Jones, G. A. ED - Benson, J. JF - Symposium of North Eastern Accelerator Personnel PB - World Scientific Publishing Co. CY - Singapore N1 - id: 1794 ER - TY - CONF T1 - Application of AMS to Oceanography: Progress at the National Ocean Sciences AMS Facility (abstract) T2 - AMS Symposium Division of Nuclear Chemistry and Technology, 203rd American Chemical Society National Meeting Y1 - 1992 A1 - McNichol, A. P. A1 - Jones, G. A. A1 - Schneider, R. J. A1 - von Reden, K. F. JF - AMS Symposium Division of Nuclear Chemistry and Technology, 203rd American Chemical Society National Meeting N1 - id: 1796 ER - TY - JOUR T1 - Illumination of a Black-Box - Analysis of Gas-Composition during Graphite Target Preparation JF - Radiocarbon Y1 - 1992 A1 - McNichol, A. P. A1 - Gagnon, A. R. A1 - Jones, G. A. A1 - Osborne, E. A. KW - deposition AB - We conducted a study of relative gas composition changes of CO2, CO and CH4 during the formation of graphite targets using different temperatures, catalysts and methods. Reduction with H-2 increases the reaction rate without compromising the quality of the AMS target produced. Methane is produced at virtually any temperature, and the amount produced is greater at very low temperatures. The reduction of CO to graphite is very slow when H-2 is not included in the reaction. VL - 34 SN - 0033-8222 IS - 3 N1 - Kf389Times Cited:63 Cited References Count:10 JO - Radiocarbon ER - TY - JOUR T1 - Initial Dating and Paleoenvironmental Results From Lake Baikal, Southeastern Siberia JF - Abstracts With Programs of the American Quaternary Association Y1 - 1992 A1 - Colman, S. M. A1 - Karabanov, E. B. A1 - Williams, D. F. A1 - Hearn, P. P., Jr. A1 - King, J. W. A1 - Orem, W. H. A1 - Bradbury, J. P. A1 - Shanks, W. C., III A1 - Jones, G. A. A1 - Carter, S. J. VL - xx N1 - id: 905 ER - TY - JOUR T1 - The National Ocean Sciences Accelerator Mass Spectrometer for Precision C-14 at Woods Hole Oceanographic Institution -- Status and new results JF - EOS, Transactions of the American Geophysical Union Y1 - 1992 A1 - von Reden, K. F. A1 - Jones, G. A. A1 - Schneider, R. J. A1 - McNichol, A. P. A1 - Cohen, G. J. VL - 72 N1 - id: 926 ER - TY - JOUR T1 - The new National Ocean Sciences Accelerator Mass Spectrometer Facility at Woods Hole Oceanographic Institution-Progress and first results (Proceedings of the 14th International Radiocarbon Conference, 1991) JF - Radiocarbon Y1 - 1992 A1 - von Reden, K. F. A1 - Jones, G. A. A1 - Schneider, R. J. A1 - McNichol, A. P. A1 - Cohen, G. J. A1 - Purser, K. H. VL - 34 N1 - id: 1787 ER - TY - CONF T1 - The new National Ocean Sciences Accelerator Mass Spectrometer Facility at Woods Hole Oceanographic Institution - Progress and First Results T2 - 14th International Radiocarbon Conference 1991 Y1 - 1992 A1 - von Reden, K. F. A1 - Jones, G. A. A1 - Schneider, R. J. A1 - McNichol, A. P. A1 - Cohen, G. J. A1 - Purser, K. H. ED - Long, A. JF - 14th International Radiocarbon Conference 1991 PB - Radiocarbon VL - 34 N1 - id: 1618 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 - Rapid Analysis of Seawater Inorganic Carbon at the National Ocean Sciences AMS Facility: Progress and Preliminary Results (abstract) JF - EOS, Transactions of the American Geophysical Union Meeting Y1 - 1992 A1 - McNichol, A. P. A1 - Jones, G. A. A1 - Schneider, R. J. A1 - von Reden, K. F. A1 - Key, R. M. VL - 72 IS - 65 N1 - id: 1655 ER - TY - CONF T1 - AMS radiocarbon results obtained from graphite targets produced at the Woods Hole Oceanographic Institution between 1986 and 1991 T2 - 14th Internation Radiocarbon Conference Y1 - 1991 A1 - Gagnon, A. R. A1 - Jones, G. A. JF - 14th Internation Radiocarbon Conference CY - Tucson, AZ N1 - id: 957 ER - TY - JOUR T1 - Illumination of a black box: Gas composition changes during graphite target preparation for AMS (Proceedings of the 14th International Radiocarbon Conference, 1991) JF - Radiocarbon Y1 - 1991 A1 - McNichol, A. P. A1 - Gagnon, A. R. A1 - Jones, G. A. A1 - Osborne, E. A. VL - 34 N1 - id: 1745 ER - TY - RPRT T1 - Measuring 14C in seawater by Accelerator Mass Spectrometry Y1 - 1991 A1 - McNichol, A. P. A1 - Jones, G. A. PB - WOCE Hydrographic Programme Office/Woods Hole Oceanographic Institution CY - Woods Hole, MA VL - WOCE Report No. 68/91 N1 - id: 1610 ER - TY - CONF T1 - The optimization of target production for AMS T2 - 14th International Radiocarbon Conference Y1 - 1991 A1 - McNichol, A. P. A1 - Gagnon, A. R. A1 - Jones, G. A. A1 - Schneider, R. J. A1 - von Reden, K. F. JF - 14th International Radiocarbon Conference CY - Tucson, AZ N1 - id: 922 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 -