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96 results for “oxygen isotopes”
Major and trace bulk sample and micro-XRF geochemistry, carbon and oxygen stable isotope compositions of magmatic and sedimentary rocks from Hovedøya Island, Oslo fjord, Norway.
<p>This data set reports on the methodologies and results of geochemical analysis carried out on samples of magmatic rock, calcite and sedimentary rocks of Hovedoya Island, Oslo fjord, Norway, in the framework of the publication by Poppe et al. (2020; <em>Geochemistry, Geophysics, Geosystems</em>; <a href="https://doi.org/10.1029/2019GC008685">https://doi.org/10.1029/2019GC008685</a>). The major and trace element bulk sample geochemical analysis was carried at the Laboratoire G-Time, Université Libre de Bruxelles, Brussels (V. Debaille), the micro-XRF mapping and line scanning, was carried out at the laboratory of the Analytical and Environmental Geo-Chemistry (AMGC) group at the Vrije Universiteit Brussel (VUB), Brussels (N.J. de Winter, S. Poppe) and the stable isotope composition analysis was carried out as well at the AMGC laboratory (S. Poppe, S. Goderis), supervised by P. Claeys and M. Kervyn, in collaboration with P. Boulvias. Data sheets are provided in .csv or .xlsx format and compressed folders containing .TIF images of µXRF elemental maps are attached. This data set also contains the complete data sets obtained for the construction of calibration curves for µXRF line scan analysis of rock samples of magmatic composition at the AMGC laboratory at VUB.</p>
Dataset for "Atmospheric oxygen isotopic fractionation in clouds: a bin–resolved microphysics model approach"
<p>This dataset contains the raw model outputs for the paper titled "Atmospheric oxygen isotopic fractionation in clouds: a bin–resolved microphysics model approach" by Thibault Hiron and Andrea Flossmann.</p> <p>The structure of the data and the explaination for the filenames are to be found in the ReadMe.txt file.</p>
A 1505-year sunshine duration reconstruction derived from stable carbon and oxygen isotopes
<p>Related to publication: <a title="Persistent link using digital object identifier" href="https://doi.org/10.1016/j.scitotenv.2024.172042" target="_blank" rel="noreferrer noopener">https://doi.org/10.1016/j.scitotenv.2024.172042</a></p> <p>Olga V. Churakova (Sidorova), Rolf T.W. Siegwolf, Mikhail S. Zharkov, Matthias Saurer,<br>Dual carbon and oxygen isotopes in Siberian tree rings as indicator of millennia sunshine duration changes,<br>Science of The Total Environment,<br>2024,<br>172042,<br>ISSN 0048-9697,<br>https://doi.org/10.1016/j.scitotenv.2024.172042.<br>(https://www.sciencedirect.com/science/article/pii/S0048969724021855)<br>Abstract: The current lack of information on past summer sunshine duration variability from annually resolved palaeoclimatological archives is hindering progress in the understanding and modelling of the earth climate system. We show that a combination of tree-ring carbon and oxygen isotopes from Siberia provides robust information on summer sunshine duration, which we use for an annual 1505-year reconstruction of July sunshine duration variability (1,5K-SIB-JSDR). We found that the Medieval maximum is 56 % higher than the average over 1505 years. Rapid and drastic decreases in sunshine duration up to 60 % correspond to major stratospheric volcanic eruptions. Grand Solar Minima and total sunspot numbers are also well preserved in the 1,5K-SIB-JSDR. Coherency with a global air temperature composite and spring Arctic Oscillation indicate that a large-scale climate signal is retained in our sunshine reconstruction.</p> <p>Keywords: Stable isotopes; Sunshine duration; Reconstruction; Volcanic eruptions; Sunspot numbers; Atmospheric circulation patterns; Permafrost; Siberia</p>
Middle Miocene climate and stable oxygen isotopes in Europe
<p>v1. Three ECHAM5-wiso model experiments for European region. For the first experiment (Europe_PI.nc), boundary conditions are set as pre-industrial and are identical to those in Botsyun et al., 2020. We also conducted two experiments with Middle Miocene boundary conditions reflecting two <em>p</em>CO<sub>2 </sub>settings (278 ppm and 450 ppm; Europe_Mio_278.nc and Europe_Mio_450.nc experiments) within current estimates of the Middle Miocene <em>p</em>CO<sub>2.</sub></p> <p>v2. Global ECHAM5-wiso model experiments. geosp_simulations.nc contains surface geopotential for PI and Miocene experiments with modified Alpine topography and paleogeography.<br> </p> <p> </p>
Water isotopic composition (Oxygen-18 and Deuterium) from the EPICA Dome C ice core at 11 cm resolution
<p>This manuscript presents a compilation of high resolution (11 cm) water isotopic records including published and new measurements over the last 800 000 years on the EPICA Dome C ice core, Antarctica. Using this new water isotopes (δ18O and δD) combined dataset, we study the variability and possible influence of diffusion at multi-decadal to multi-centennial scale. We observe a stronger variability on the onset of the interglacial interval corresponding to a warm period.</p>
Triple oxygen isotope variability of precipitation in a tropical mountainous region
<p>Triple oxygen isotope data associated with monthly integrated precipitation and discrete (subsurface-sourced) tap water samples collected over one year from sites across Panama.</p>
Anodontites spp. shells oxygen and carbon isotopes
<p>Stable isotopic ratios (δ<sup>18</sup>O<em><sub>S</sub></em> and δ<sup>13</sup>C<em><sub>S</sub></em>) of carbonate powder samples from 4 bivalves shells: 2 <em>Anodontites elongatus</em> (Ae-1 & Ae-2) from a peruvian site (near Iquitos, 3°44'32.2''S; 73°13'31.2''W) and 2 <em>Anotontites trapesialis</em> (At-1 & At-2) from a brazilian site (Ilha Paciência, 3°19'21.0''S; 60°16'36.0''W).</p> <p>Samples were drilled in the hinge using a computer-monitored microdrilling equipment (New Wave<sup>®</sup> Micromill). The hinge was sampled continuously from internal to external part of the shell taking care to maintain each sampling groove parallel to the growth lines. Distance between successive grooves was determined to have both enough carbonate powder for stable isotope analysis and an assumed infra-seasonal resolution considering that growth lines were annual due to the clear bimodal Amazonian environmental variability (dry/wet seasons). Successive grooves were spaced about 60 µm to sample 41± 26 µg of carbonate powder. On average, 9 and 6 sampling grooves were done per growth increment for <em>A. trapesialis</em> and <em>A. elongatus</em>, respectively.</p> <p>δ<sup>18</sup>O<em><sub>S</sub></em> and δ<sup>13</sup>C<em><sub>S</sub></em> data are given along the distance (d in mm) in the hinges from the oldest to the younger part of the shells (growth direction).</p>
Fig. 1 in Palaeoecology of Late Triassic conodonts: Constraints from oxygen isotopes in biogenic apatite
Fig. 1. Reconstruction of the Western Tethys and position of the Lagonegro Basin (Southern Apennines, Italy) for the Carnian (Late Triassic), modified after Stampfli and Kozur (2006). White, landmass; dark grey, basins; light grey, rift zones; hazel grey, continent margins.
Fig. 2 in Palaeoecology of Late Triassic conodonts: Constraints from oxygen isotopes in biogenic apatite
Fig. 2. Oxygen isotope curves of conodont apatite from the Sasso di Castalda and Pignola 2 sections, Lagonegro Basin (Southern Apennines, Italy). Dark gray and light gray contours give, respectively, analytical reproducibility of 1 Ơ and 2 Ơ for δ18O. Radiometric age of 230.91 ± 0.33 Mya from Furin et al. (2006, 2007). Time scale after Brack et al. (2005).
Linked collectors and determiners for: (Appendix 9) Stable oxygen isotope record of Globigerina bulloides, and abundances of Neogloboquadrina pachyderma and ice-rafted debris in sediment core MD99-2331.
Natural history specimen data linked to collectors and determiners held within, "(Appendix 9) Stable oxygen isotope record of Globigerina bulloides, and abundances of Neogloboquadrina pachyderma and ice-rafted debris in sediment core MD99-2331". Claims or attributions were made on Bionomia by volunteer Scribes, <a href="https://bionomia.net/dataset/7c8fa7a0-f762-11e1-a439-00145eb45e9a">https://bionomia.net/dataset/7c8fa7a0-f762-11e1-a439-00145eb45e9a</a> using specimen data from the dataset aggregated by the Global Biodiversity Information Facility, <a href="https://gbif.org/dataset/7c8fa7a0-f762-11e1-a439-00145eb45e9a">https://gbif.org/dataset/7c8fa7a0-f762-11e1-a439-00145eb45e9a</a>. Formatted as a Frictionless Data package.
Linked collectors and determiners for: (Appendix 8) Stable oxygen isotope record of Globigerina bulloides, and abundances of Neogloboquadrina pachyderma and ice-rafted debris in sediment core MD99-2339.
Natural history specimen data linked to collectors and determiners held within, "(Appendix 8) Stable oxygen isotope record of Globigerina bulloides, and abundances of Neogloboquadrina pachyderma and ice-rafted debris in sediment core MD99-2339". Claims or attributions were made on Bionomia by volunteer Scribes, <a href="https://bionomia.net/dataset/7c8bc98c-f762-11e1-a439-00145eb45e9a">https://bionomia.net/dataset/7c8bc98c-f762-11e1-a439-00145eb45e9a</a> using specimen data from the dataset aggregated by the Global Biodiversity Information Facility, <a href="https://gbif.org/dataset/7c8bc98c-f762-11e1-a439-00145eb45e9a">https://gbif.org/dataset/7c8bc98c-f762-11e1-a439-00145eb45e9a</a>. Formatted as a Frictionless Data package.
Linked collectors and determiners for: (Appendix 6) Stable oxygen isotope record of Globigerina bulloides and abundance of Neogloboquadrina pachyderma in sediment core MD95-2041.
Natural history specimen data linked to collectors and determiners held within, "(Appendix 6) Stable oxygen isotope record of Globigerina bulloides and abundance of Neogloboquadrina pachyderma in sediment core MD95-2041". Claims or attributions were made on Bionomia by volunteer Scribes, <a href="https://bionomia.net/dataset/7c86987c-f762-11e1-a439-00145eb45e9a">https://bionomia.net/dataset/7c86987c-f762-11e1-a439-00145eb45e9a</a> using specimen data from the dataset aggregated by the Global Biodiversity Information Facility, <a href="https://gbif.org/dataset/7c86987c-f762-11e1-a439-00145eb45e9a">https://gbif.org/dataset/7c86987c-f762-11e1-a439-00145eb45e9a</a>. Formatted as a Frictionless Data package.
Linked collectors and determiners for: (Appendix 5) Stable oxygen isotope record of Globigerina bulloides, and abundances of Neogloboquadrina pachyderma and ice-rafted debris in sediment core MD95-2039.
Natural history specimen data linked to collectors and determiners held within, "(Appendix 5) Stable oxygen isotope record of Globigerina bulloides, and abundances of Neogloboquadrina pachyderma and ice-rafted debris in sediment core MD95-2039". Claims or attributions were made on Bionomia by volunteer Scribes, <a href="https://bionomia.net/dataset/7c82cc38-f762-11e1-a439-00145eb45e9a">https://bionomia.net/dataset/7c82cc38-f762-11e1-a439-00145eb45e9a</a> using specimen data from the dataset aggregated by the Global Biodiversity Information Facility, <a href="https://gbif.org/dataset/7c82cc38-f762-11e1-a439-00145eb45e9a">https://gbif.org/dataset/7c82cc38-f762-11e1-a439-00145eb45e9a</a>. Formatted as a Frictionless Data package.
Linked collectors and determiners for: (Appendix 4) Stable oxygen isotope record of Globigerina bulloides and abundances of Neogloboquadrina pachyderma and ice-rafted debris in sediment core MD95-2040.
Natural history specimen data linked to collectors and determiners held within, "(Appendix 4) Stable oxygen isotope record of Globigerina bulloides and abundances of Neogloboquadrina pachyderma and ice-rafted debris in sediment core MD95-2040". Claims or attributions were made on Bionomia by volunteer Scribes, <a href="https://bionomia.net/dataset/7c7f09f4-f762-11e1-a439-00145eb45e9a">https://bionomia.net/dataset/7c7f09f4-f762-11e1-a439-00145eb45e9a</a> using specimen data from the dataset aggregated by the Global Biodiversity Information Facility, <a href="https://gbif.org/dataset/7c7f09f4-f762-11e1-a439-00145eb45e9a">https://gbif.org/dataset/7c7f09f4-f762-11e1-a439-00145eb45e9a</a>. Formatted as a Frictionless Data package.
Linked collectors and determiners for: (Appendix 3) Stable oxygen isotope record of Globigerina bulloides and abundance of Neogloboquadrina pachyderma in sediment core MD99-2341.
Natural history specimen data linked to collectors and determiners held within, "(Appendix 3) Stable oxygen isotope record of Globigerina bulloides and abundance of Neogloboquadrina pachyderma in sediment core MD99-2341". Claims or attributions were made on Bionomia by volunteer Scribes, <a href="https://bionomia.net/dataset/7c7dd412-f762-11e1-a439-00145eb45e9a">https://bionomia.net/dataset/7c7dd412-f762-11e1-a439-00145eb45e9a</a> using specimen data from the dataset aggregated by the Global Biodiversity Information Facility, <a href="https://gbif.org/dataset/7c7dd412-f762-11e1-a439-00145eb45e9a">https://gbif.org/dataset/7c7dd412-f762-11e1-a439-00145eb45e9a</a>. Formatted as a Frictionless Data package.
CESM1.2 simulation data for "CO2 and orbitally driven oxygen isotope variability in the Early Eocene"
<p>CESM1.2 simulation data for the Early Eocene. These are atmosphere and land climatology files for simulations at both 3x and 6x pre-industrial CO2 levels, as well as 4 separate orbits. The climatology was averaged over the last 100 years of each simulation.</p>
Local physical oceanographic and oxygen isotopic observations at Palmyra Atoll of the 2014-15 and 2015-16 El Nino events
Open the record for dataset details and reuse information.
Nitrogen and oxygen stable isotopes of nitrate from CalCOFI lines 80 and 93 plus station 081.8 046.9. Collected on cruises from 2010 to 2016.
Stable isotopes of nitrate were measured on CalCOFI cruises from 2010-2016 from lines 80 and 93 plus station 081.8 046.9. Samples were filtered directly from the CTD and then frozen until analysis. Samples collected from 2010-2012 were analyzed in the Sigman Lab at Princeton University. Samples collected from 2013-2016 were analyzed in the Wankel Lab at Woods Hole Oceanographic Insititution. Five samples from station 081.8 046.9 (the Santa Barbara Basin) were further analyzed for nitrogen isotopes of nitrite in the Wankel Lab.
Oxygen Isotope Fractionation by Anaerobic Ammonium-Oxidizing Bacteria
<p>Isotope composition of nitrite, nitrate, and water, as well as concentrations of nitrite, nitrate, and ammonium, were measured during the experiments with enrichment cultures of the anammox bacterium <em>Kuenenia stuttgartiensis. </em>Samples were collected sequentially during the course of the anammox activity until the complete consumption of nitrite.<em> </em>Isotope composition of nitrite and water was measured during the abiotic experiments to follow the abiotic oxygen isotope exchange between nitrite and water. The exchange was followed over the time period of 48 h.</p>
The oxygen isotope compositions of large numbers of small cosmic spherules: Implications for their sources and the isotopic composition of the upper atmosphere
<p>Cosmic spherules are micrometeorites that melt at high altitude as they enter Earth's atmosphere and their oxygen isotope compositions are partially or completely inherited from the upper atmosphere, depending on the heating experienced and the nature of their precursor materials. In this study, the <b>three oxygen isotope</b> compositions of 137 <b>cosmic spherules are</b> determined using 277 in-situ analyses by ion probe. Particles of each different type of cosmic spherule (scoriaceous, porphyritic, cryptocrystalline, barred, glass, calcium aluminium and titanium (CAT), G-type and I-type) in the diameter range ~52–480mm were analysed. The results confirm that the <b>three</b> oxygen isotope compositions of melted <b>micrometeorites</b> reflect a combination of their precursor composition, exchange with the atmosphere and mass fractionation owing to evaporation during entry heating. The data <b>appear to </b>reveal an increase in average δ<sup>18</sup>O values of silicate dominated (S-type) spherules in the series scoriaceous<porphyritic<barred<glass<CAT spherules (~20, 22, 25, 26 and 50‰) that is consistent with the evolution of oxygen isotopes by mass fractionation owing to increased average entry heating. The trend of δ<sup>17,18</sup>O is broadly parallel to the terrestrial fractionation line and thus suggests mass fractionation dominates changes in isotopic composition, with atmospheric exchange a less significant effect. The D<sup>17</sup>O values of spherules, therefore, are mostly preserved and suggest that ~80% of particles are related to the carbonaceous chondrites (CC) and are probably samples of C-type asteroids. The genetic relationships between different S-types can also be determined with scoriaceous, barred and cryptocrystalline spherules mostly having low D<sup>17</sup>O values <b>(≤0‰)</b> suggesting they are mainly derived from CC-like sources, whilst porphyritic mostly have positive D<sup>17</sup>O <b>(>0‰)</b> suggesting they are largely from ordinary chondrite (OC)-like sources related to S(IV)-type asteroids. Glassy and CAT-spherules have D<sup>17</sup>O values <b>indicating</b> they formed by intense entry heating of both CC and OC-like materials. I-type cosmic spherules have a narrow range of δ<sup>17</sup>O (~20–25‰) and δ<sup>18</sup>O (~38–48‰) values, with D<sup>17</sup>O (~0‰) <b>suggesting</b> their oxygen is obtained entirely from the Earth's atmosphere, albeit with significant mass fractionation owing to evaporation during entry heating. The observed range of δ<sup>18</sup>O with the size is suggested here to reflect entry angle with high values representing enhanced heating at high angle. Finally, G-type <b>cosmic spherules</b> have unexpected isotopic compositions suggesting little mass-fractionation from a CC-like source and are suggested to have sulphide-silicate precursors with relatively low melting temperatures. The results of this study provide a <b>vital assessment</b> of the <b>wider</b> population of extraterrestrial dust arriving <b>at the</b> Earth.</p>
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