NDLTD logo NDLTD Union Catalog and Global ETD Search

Global ETD Search

Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.

Results

Showing 1 to 20 of 314 for “"radiocarbon"”.

  1. Biogeochemical applications of compound-specific radiocarbon analysis

    Pearson, AnnMassachusetts Institute of Technology and Woods Hole Oceanographic Institution1999

    Compound-specific carbon isotopic (δ13C and Δ14C) data are reported for lipid biomarkers isolated from Santa Monica Basin (SMB) and Santa Barbara Basin (SBB) surface sediments. These organic compounds represent phytoplanktonic, zooplanktonic, bacterial, archaeal, terrestrial, and fossil carbon …

    woods-hole Repository record

  2. Biogeochemical applications of compound-specific radiocarbon analysis

    Pearson, Ann, 1971-Massachusetts Institute of Technology2000

    Compound-specific carbon isotopic (613C and A14C) data are reported for lipid biomarkers isolated from Santa Monica Basin (SMB) and Santa Barbara Basin (SBB) surface sediments. These organic compounds represent phytoplanktonic, zooplanktonic, bacterial, archaeal, terrestrial, and fossil carbon …

    mit Repository record

  3. Tracing the global carbon cycle with bomb radiocarbon

    Hesshaimer, VagoUniversität Heidelberg

    Bomb radiocarbon (14C) emitted to the atmosphere by nuclear explosion tests has not yet reached equilibrium within the Earth carbon system. In the present thesis this fate of radiocarbon is investigated using coarse-grid models to trace high-precision 14CO2 observations available in the atmosphere …

    heid-diss Repository record

  4. Reconstructing deglacial ocean ventilation using radiocarbon : data and inverse modeling

    Zhao, NingMassachusetts Institute of Technology and Woods Hole Oceanographic Institution2017

    … not well understood. In this thesis, I rely on radiocarbon measurements on fossil biogenic carbonates sampled from the seafloor to constrain deglacial ocean ventilation rates, using new data, an extensive data compilation, and inverse modeling. First, based on a sediment core that is absolutely …

    woods-hole Repository record

  5. A dendrochronological and radiocarbon analysis of two African Acacia species

    Mader, Andre DerekDepartment of Biological Sciences2003

    cape-town Repository record

  6. Reconstructing deglacial ocean ventilation using radiocarbon : data and inverse modeling

    Zhao, Ning, Ph. D. Massachusetts Institute of TechnologyMassachusetts Institute of Technology2017

    … not well understood. In this thesis, I rely on radiocarbon measurements on fossil biogenic carbonates sampled from the seafloor to constrain deglacial ocean ventilation rates, using new data, an extensive data compilation, and inverse modeling. First, based on a sediment core that is absolutely …

    mit Repository record

  7. An inverse modeling approach to investigate deep ocean ventilation from radiocarbon records

    Duffy, FaithMassachusetts Institute of Technology and Woods Hole Oceanographic Institution2022

    … the relationship between paleoceanographic radiocarbon records and the ventilation history of deep oceanic basins during the last 40 kyrs. Deep ocean ventilation changes, especially changes in Atlantic meridional overturning circulation (AMOC), are often invoked to explain the deglacial rise …

    woods-hole Repository record

  8. Old dates,cool stories: Radiocarbon dating trees in the last cooling event

    Sookdeo, AdamETH Zurich2019

    ethz Repository record

  9. Soil organic carbon dynamics under environmental change: A radiocarbon-based investigation across Switzerland

    Minich, Luisa IsabellETH Zurich2025

    ethz Repository record

  10. Radiocarbon Compounds Produced by Slow Neutron Irradiation of Ammonium-Chloride and Ammonium-Bromide

    Vaughan, John DixonUniversity of Illinois at Urbana-Champaign2014

    Made available in DSpace on 2014-12-05T19:36:00Z (GMT). No. of bitstreams: 1 0009159.pdf: 9416785 bytes, checksum: 0d9bd00afb24b88d20acff44e286f72a (MD5) Previous issue date: 1954

    uiuc Repository record

  11. A radiocarbon method and multi-tracer approach to quantifying groundwater discharge to coastal waters

    Gramling, Carolyn M.Massachusetts Institute of Technology and Woods Hole Oceanographic Institution2003

    … seeps, and diffuse discharge. The natural radiocarbon content (Δ14C) of dissolved inorganic carbon (DIC) was developed as a tracer of fresh, terrestrially driven fluxes from confined aquifers. This Δ14C method was tested during five sampling periods from November 1999 to April 2002 in two …

    woods-hole Repository record

  12. Rapid extraction of dissolved inorganic carbon from seawater and groundwater samples for radiocarbon dating

    Gospodinova, Kalina D.Massachusetts Institute of Technology and Woods Hole Oceanographic Institution2012

    … carbon from seawater and groundwater samples for radiocarbon dating. The Rapid Extraction of Dissolved Inorganic Carbon System (REDICS) consists of two subsystems – one for sample introduction, acidification, and carbon dioxide extraction, and one for carbon dioxide quantification and storing. The …

    woods-hole Repository record

  13. Growth Characterization of Mesophotic Rhodoliths in the Northern Gulf of Mexico Using Radiocarbon Dating

    Olmstead, Sarah AUniversity of Alabama Libraries2023

    … mapping. Therefore, we utilized sequential radiocarbon analysis for growth characterization of mesophotic boxwork rhodoliths. Rhodoliths were collected from the Flower Garden Banks National Marine Sanctuary in the northern Gulf of Mexico from one location at 48 – 72 m and another at 200 m, …

    alabama Repository record

  14. Mapping and Radiocarbon Dating Archaic Period Monuments: La Alberca Structure Complex, Highland Michoacán, Mexico

    Steinkraus, Mark F.2016

    … as 5000 to 4000 years ago (in calibrated radiocarbon years). These radiocarbon dates fall in sequence and overlap the dates for the burial in the nearby La Alberca Rockshelter (6650 -3985 cal B.P.). The Central Structure as well as above ground Structures 1 and 5 (labeled <em>Yacata</em>) …

    central-wash Repository record

  15. Rapid extraction of dissolved inorganic carbon from seawater and groundwater samples for radiocarbon dating

    Gospodinova, Kalina DonevaMassachusetts Institute of Technology2012

    … carbon from seawater and groundwater samples for radiocarbon dating. The Rapid Extraction of Dissolved Inorganic Carbon System (REDICS) consists of two subsystems - one for sample introduction, acidification, and carbon dioxide extraction, and one for carbon dioxide quantification and storing. The …

    mit Repository record

  16. A radiocarbon method and multi-tracer approach to quantifying groundwater discharge to coastal waters

    Gramling, Carolyn MMassachusetts Institute of Technology2003

    … seeps, and diffuse discharge. The natural radiocarbon content (A14C) of dissolved inorganic carbon (DIC) was developed as a tracer of fresh, terrestrially driven fluxes from confined aquifers. This A14C method was tested during five sampling periods from November 1999 to April 2002 in two …

    mit Repository record

  17. GLOBAL ASSESSMENT OF RADIOCARBON ISOTOPIC ANALYSIS FOR PARTICULATE AND DISSOLVED ORGANIC CARBON IN RIVERINE SYSTEMS

    Tucker, Ashley2019

    … the age of POC and DOC exported and how the radiocarbon age may vary with latitude, topographic gradient, vegetation, and land use. I provide the first global synthesis of published radiocarbon values of POC and DOC (∆14C). Inclusion of DOC and POC parameters (µM, δ13C, ∆14C) reveal …

    vcu Repository record

  18. Investigations of temporal changes in climate and the geomagnetic field via high-resolution radiocarbon dating

    Mellström, AnetteDepartment of Geology, Lund University2014

    … with a distinct increase in the atmospheric radiocarbon (14C) concentration, which has been interpreted to be a result of decreased solar activity. Therefore, a solar-induced climate change has been suggested. In addition to changes in solar activity, geomagnetic field records also show …

    lund Repository record

  19. Constraining circulation changes through the last deglaciation with deep-sea coral radiocarbon and sedimentary 231Pa/230Th

    Burke, AndreaMassachusetts Institute of Technology and Woods Hole Oceanographic Institution2012

    … and as tracers of ocean processes. Here I use radiocarbon and uranium series isotopes to investigate the ocean’s role in climate change over the last deglaciation. I present a new method for rapid radiocarbon analyses as a means of age-screening deep-sea corals for further study. Based on age …

    woods-hole Repository record

  20. Modern radiocarbon offsets within the land snails Cyclophorus: a tropical karst case study from Northern Vietnam

    Bachtsevanidou Strantzali, IoannaQueen's University Belfast2020

    … reliable interpretation of radiocarbon (14C) dates of terrestrial mollusc shells depends on an understanding of their ecology and behaviour as well as the geology of the area. Since gastropods feed by substrate scraping, they are prone to biased radiocarbon dates as they can …

    qu-belfast Repository record

Page 1 of 16