Sheila Griffin

Biographic Data

ID5597672
NAMESheila Griffin
GIVEN NAMESSheila
FAMILY NAMEGriffin
SIGNATUREGRIFFIN S
VERIFIEDNo
TOTAL WORKS30
TOTAL CITATIONS94
AUTHOR COUNT30
EDITOR COUNT0
FIRST PUBLICATION YEAR1985
LATEST PUBLICATION YEAR2024
H-INDEX5

  • Time Series of Surface Water Dissolved Inorganic Carbon Isotopes From the Southern California Bight

    Open AccessNiels E Hauksson, X Xu et al.ARTICLERadiocarbon2024References: 33

    Dissolved inorganic carbon (DIC) in ocean water is a major sink of fossil fuel derived CO 2 . Carbon isotopes in DIC serve as tracers for oceanic water masses, biogeochemical processes, and air-sea gas exchange. We present a timeseries of surface DIC δ 13 C and Δ 14 C values from 2011 to 2022 from Newport Beach, California. This is a continuation of previous timeseries (Hinger et al. 2010; Santos et al. 2011) that together provide an 18-year reco…

  • UV Photochemical Oxidation and Extraction of Marine Dissolved Organic Carbon at UC Irvine

    Open AccessBrett D Walker, Steven R Beaupré et al.ARTICLERadiocarbon2019Cited by: 2References: 16

    The first ultraviolet photochemical oxidation (UVox) extraction method for marine dissolved organic carbon (DOC) as CO 2 gas was established by Armstrong and co-workers in 1966. Subsequent refinement of the UVox technique has co-evolved with the need for high-precision isotopic (Δ 14 C, δ 13 C) analysis and smaller sample size requirements for accelerator mass spectrometry radiocarbon (AMS 14 C) measurements. The UVox line at UC Irvine was establ…

  • Uptake of Carbon for Cellulose Production in a White Oak from Western Oregon, USA

    Open AccessWilliam F Cain, Sheila Griffin et al.ARTICLERadiocarbon2018Cited by: 4References: 13

    We report ∆ 14 C measurements of cellulose extracted from near monthly tree ring growth for the 1960s of a white oak that grew in western Oregon, USA. Comparison with ∆ 14 C measurements of atmospheric CO 2 reveals that the tree ring ∆ 14 C values were equal to or lower than those in atmospheric CO 2 at the time of ring formation. We suggest that the low tree ring ∆ 14 C values during the period 1962–1963 were caused by the presence of an atmosph…

  • Obituary

    Open AccessEllen R M Druffel, Sheila Griffin et al.ARTICLERadiocarbon2018References: 3

    where he served as department chair, chair of the faculty senate, and a valuable mentor to many undergraduate students. Bill was six feet, eight inches tall (just over 2 meters), with a deep voice and a quick wit

  • Temporal Variability of Dissolved Organic Radiocarbon in the Deep North Pacific Ocean

    Open AccessEllen R M Druffel, Sheila Griffin et al.ARTICLERadiocarbon2018References: 31

    We report marine dissolved organic carbon (DOC) ∆ 14 C from seawater collected from the North central Pacific Ocean (NCP) in 2015. These measurements show DOC ∆ 14 C values averaged –235±5‰ ( n =3) in the mixed layer (24–81 m) and –544±5‰ ( n =5) in the deep water (1500–5139 m). A comparison of these data with two previously published DOC ∆ 14 C profiles from the NCP in 1985 and 1987 reveals that deep DOC ∆ 14 C values have decreased. We discuss …

  • Effect of Acidified Versus Frozen Storage on Marine Dissolved Organic Carbon Concentration and Isotopic Composition

    Open AccessBrett D Walker, Sheila Griffin et al.ARTICLERadiocarbon2017Cited by: 1References: 23

    The standard procedure for storing/preserving seawater dissolved organic carbon (DOC) samples after field collection is by freezing (–20°C) until future analysis can be made. However, shipping and receiving large numbers of these samples without thawing presents a significant logistical problem and large monetary expense. Access to freezers can also be limited in remote field locations. We therefore test an alternative method of preserving and st…

  • Upwelling of Pacific Intermediate Water in the South China Sea Revealed by Coral Radiocarbon Record

    Open AccessAnnette Bolton, Nathalie F Goodkin et al.ARTICLERadiocarbon2016Cited by: 2References: 58

    Annual radiocarbon from a massive Porites lutea coral collected from Hon Tre Island, Vietnam, South China Sea (SCS) was analyzed over a ~100-yr-long period from AD 1900 to 1986. The pre-bomb results from 1900–1953 show a steady Δ 14 C value of –54.4±1.8‰ ( n =60). These values are similar to coral records located in the central and southern SCS and from Indonesian waters, but are lower than those from Japan. Following the input of anthropogenic b…

  • Early Bomb Radiocarbon Detected in Palau Archipelago Corals

    Open AccessDanielle Glynn, Ellen Druffel et al.ARTICLERadiocarbon2013Cited by: 2References: 11

    In order to evaluate the variability in surface water masses in the Western Pacific Warm Pool, we report high-precision radiocarbon measurements in annual and seasonal bands from Pontes lutea corals collected from the Palau Archipelago (7°N, 134°E). Annual coral bands from 1945 to 2008 and seasonal samples from 1953 to 1957 were analyzed to capture the initial early input of bomb 14 C from surface thermonuclear weapons testing in the Marshall Isl…

  • Comparison of Particulate Organic and Dissolved Inorganic Radiocarbon Signatures in the Surface Northeast Pacific Ocean

    Open AccessChanda Bertrand, Brett Walker et al.ARTICLERadiocarbon2013References: 19

    It has long been assumed that radiocarbon (Δ 14 C) content of dissolved inorganic carbon (DIC) is equal to that of particulate organic carbon (POC) in surface seawater; however, little research has been conducted to explicitly test this assumption. Here, we report Δ 14 C measurements of surface POC samples and compare them with contemporaneous DIC Δ 14 C measurements from the northeast Pacific Ocean (Hwang et al. 2004; Druffel et al. 2010). Sampl…

  • Total Uncertainty of Radiocarbon Measurements of Marine Dissolved Organic Carbon and Methodological Recommendations

    Open AccessEllen R M Druffel, Ellen Druffel et al.ARTICLERadiocarbon2013Cited by: 4References: 6

    We report results of duplicate measurements of dissolved organic carbon concentrations ([DOC] as μM) and Δ 14 C in seawater in order to assess the total uncertainty of reported [DOC] and Δ 14 C measurements via the UV oxidation method. In addition, pure International Atomic Energy Agency standards analyzed over a 4-yr period are evaluated. We find the total uncertainty of Δ 14 C measurements to be ±4.0. However, in samples that were thawed, subsa…

  • Δ 14 C and Δ 13 C of Seawater DIC as Tracers of Coastal Upwelling

    Open AccessGuaciara M Santos, Julie Ferguson et al.ARTICLERadiocarbon2011Cited by: 2References: 16

    Marine radiocarbon ( 14 C) is a widely used tracer of past ocean circulation, but very few high-resolution records have been obtained. Here, we report a time series of carbon isotope abundances of dissolved inorganic carbon (DIC) in surface seawater collected from the Newport Beach pier in Orange County, within the Southern California Bight, from 2005 to 2010. Surface seawater was collected bimonthly and analyzed for Δ 14 C, δ 13 C, and salinity.…

  • Radiocarbon Laboratories

    Open AccessIgsb Michailov, Cena Luiz et al.ARTICLERadiocarbon2010

    The Radiocarbon archives are made available by Radiocarbon and the University of Arizona Libraries. Contact [email protected] for further information

  • Variability of Dissolved Inorganic Radiocarbon at a Surface Site in the Northeast Pacific Ocean

    Open AccessEllen R M Druffel, Steven Beaupré et al.ARTICLERadiocarbon2010Cited by: 1References: 13

    We report radiocarbon measurements of dissolved inorganic carbon (DIC) in surface water samples collected daily during 12 cruises to Station M in the northeast Pacific off central California. Individual surface Δ 14 C values ranged from 22‰ to 70‰ over 10 yr. Variability of average cruise values is highest during winter likely due to increased mixing. A general decrease of Δ 14 C values was observed at a rate of about 3‰ per year between 1994 and…

  • Carbon Isotope Measurements of Surface Seawater from a Time-Series Site Off Southern California

    Open AccessElise N Hinger, Guaciara M Santos et al.ARTICLERadiocarbon2010Cited by: 5References: 18

    We report carbon isotope abundances of dissolved inorganic carbon (DIC) in surface seawater collected from a time-series site off the Newport Beach Pier in Orange County, California. These data represent the first time series of Δ 14 C data for a coastal southern California site. From a suite of samples collected daily from 16 October to 11 November 2004, Δ 14 C values averaged 32.1 ± 4.4‰. Freshwater input from the Santa Ana River to our site ca…

  • An Alternate Method of Diluting Dissolved Organic Carbon Seawater Samples for 14 C Analysis

    Open AccessSheila Griffin, Steven R Beaupré et al.ARTICLERadiocarbon2010Cited by: 7References: 3

    We present a time-saving modification to the ultraviolet (UV) oxidation method for analyzing dissolved organic carbon (DOC) concentration, Δ 14 C, and δ 13 C measurements in seawater and standard materials. A low background (∼0.2 ± 0.2 μM) was reported for pre-irradiated Milli-Q (MQ) water that was used to dilute samples for DOC 14 C analysis (Beaupré et al. 2007). We use MQ water without pre-irradiation (background ∼0.9 ± 0.2 μM) to dilute the s…

  • Conference Participants

    Open AccessMichael Allen, Janet Ambers et al.ARTICLERadiocarbon2007

    From the 19th International Radiocarbon Conference held in Keble College, Oxford, England, April 3-7, 2006

  • Radiocarbon Laboratories

    Open AccessIgsb Michailov, Cena Luiz et al.ARTICLERadiocarbon2007

    The Radiocarbon archives are made available by Radiocarbon and the University of Arizona Libraries. Contact [email protected] for further information

  • The Keck Carbon Cycle AMS Laboratory, University of California, Irvine

    Open AccessJohn Southon, Guaciara Santos et al.ARTICLERadiocarbon2004Cited by: 26References: 5

    A new radiocarbon accelerator mass spectrometry (AMS) laboratory for carbon cycle studies has been established at the University of California, Irvine. The 0.5MV AMS system was installed in mid-2002 and has operated routinely since October of that year. This paper briefly describes the spectrometer and summarizes lessons learned during the first year of operation. In the process of setting up the system, we identified and largely suppressed a pre…

  • Variability of Monthly Radiocarbon During the 1760S in Corals from the Galapagos Islands

    Open AccessEllen R M Druffel, Sheila Griffin et al.ARTICLERadiocarbon2004Cited by: 6References: 12

    Radiocarbon (Δ 14 C) measurements of monthly samples from a Galapagos surface coral are among the first data sets from the new Keck Carbon Cycle Accelerator Mass Spectrometry laboratory at the University of California, Irvine. An average Δ 14 C value of −62 is obtained for 144 measurements of samples from monthly coral bands that lived from about AD 1760–1771 (±6 yr). High Δ 14 C values were found during January through March, when upwelling was …

  • Preparation of Inorganic and Organic Carbon for 14 C Analysis from a Single Marine Sample

    Open AccessSheila Griffin, Ellen R M DruffelARTICLERadiocarbon1997References: 8

    We have developed a technique using a single apparatus to recover the inorganic and organic carbon from a small (few milligrams) aliquot of dried marine material for radiocarbon analysis. The main advantages of using a single apparatus are: 1) less sample is required, 2) decreased handling reduces contamination, and 3) less time and materials are used. Blank values of ∼5 μg and 19–44 μg are obtained for the inorganic and organic carbon extraction…

  • Conference Participants

    Open AccessGerald Aardsma, Mohan Abeyratne et al.ARTICLERadiocarbon1995

    This material was digitized as part of a cooperative project between Radiocarbon and the University of Arizona Libraries

  • Radiocarbon in Tropospheric CO 2 and Organic Materials from Selected Northern Hemisphere Sites

    Open AccessEllen R M Druffel, Sheila GriffinARTICLERadiocarbon1995Cited by: 3References: 8

    Radiocarbon was measured in atmospheric CO 2 from La Jolla, California and in living organic materials from six sites in the northern hemisphere. Atmospheric CO 2 ∆ 14 C values from La Jolla agreed with those previously published records from China Lake, California (Berger et al. 1987) and Vermunt, Austria (Levin et al. 1985). ∆ 14 C values of fruit and grain samples that grew during 1980 agreed with the atmospheric CO 2 ∆ 14 C measurements. Most…

  • Intercomparison of High-Precision ∆ 14 C Analyses Using Gas Counting and AMS

    Open AccessEllen R M Druffel, Douglas J Donahue et al.ARTICLERadiocarbon1995References: 7

    We report results of a three-year intercomparison experiment between the WHOI Radiocarbon Laboratory (now at University of California, Irvine) and the NSF-University of Arizona AMS Laboratory. The purpose of this study was to compare high-precision measurements of samples obtained routinely using gas proportional counting techniques with results obtained using AMS techniques. Three sets of annually banded, modern coral samples were used for the i…

  • Regional Variability of Surface Ocean Radiocarbon from Southern Great Barrier Reef Corals

    Open AccessEllen R M Druffel, Sheila GriffinARTICLERadiocarbon1995Cited by: 11References: 16

    High-precision ∆ 14 C and stable isotope (∆ 18 O and ∆ 13 C) records are reported for post-bomb corals from three sites off the eastern Australian coast. We observe that ∆ 14 C values increased from ca. −50′ in the early 1950s to +130‰ by 1974, then decreased to 110‰ by 1991. There is general agreement between the coral results and ∆ 14 C of dissolved inorganic carbon (DIC) in seawater measured previously for locations in the South Pacific. ∆ 14 …

  • Radiocarbon Updates

    Open AccessRobert Kahn, Ellen R M Druffel et al.ARTICLERadiocarbon1993

    This material was digitized as part of a cooperative project between Radiocarbon and the University of Arizona Libraries