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96 results for “oxygen isotopes”
Carbon and oxygen isotope values of bulk carbonates for Castellas Fault zone and D19 fault zones, La Fare anticline (SE France).
<p>Carbon and oxygen isotope values of bulk carbonates for Castellas Fault zone and D19 fault zones, La Fare anticline (SE France).</p> <p><strong>B</strong>: bulk measurement; <strong>M</strong>: micrite value; <strong>C1, C3, C4,</strong> and <strong>C5</strong>: cement isotopic value; <strong>FR</strong>: fault rock isotopic value.</p> <p> </p> <p>To determine stable carbon and oxygen isotopes (<sup>13</sup>C and <sup>18</sup>O), 204 microsamples (< 5 mg) were drilled, 194 of them were micro-drilled from polished thin sections with an 80 μm diameter micro-sampler (Merkantec Micromill) at VU 15 Amsterdam (the Netherlands). We micro-sampled bulk rocks (57), sparitic cements (101), fault rocks (9) and micrite (27). The bulk rock values are related to a nonselective sampling giving information on the whole-rock isotopic values. These values do not capture the signature of isolated cement (Swart, 2015). Carbon and oxygen isotopic values were acquired with Thermo Finnigan DeltaCmass spectrometer equipped with a GasBench preparation device at VU Amsterdam. The internationally used standard IAEA-603, with official values of +2.46‰for <sup>13</sup>C and -2:37‰for <sup>18</sup>O, is 25 measured as a control standard. The standard deviation (SD) of the measurements is, respectively, < 0:1‰ and < 0:2‰ for <sup>13</sup>C and <sup>18</sup>O. Ten whole-rock samples were analyzed using a GasBench II connected to a Thermo Fisher Delta V Plus mass spectrometer at the FAU University (Erlangen, 30 Germany). Measurements were calibrated by assigning <sup>13</sup>C values of +1:95‰ to NBS19 and -47:3‰ to IAEA-CO9 and <sup>18</sup>O values of -2:20‰ to NBS19. All values are reported<br> in per mil relative to V-PDB.</p>
Stable carbon, oxygen and nitrogen isotopes in tree rings from temperate forests within long-term monitoring network in the UK
<p>Supporting dataset for the paper "Climate and atmospheric deposition effects on forest water‑use efficiency and nitrogen availability across Britain" by Guerrieri et al. 2020 Scientific Reports DOI is 10.1038/s41598-020-67562-w (<a href="https://www.nature.com/articles/s41598-020-67562-w">https://www.nature.com/articles/s41598-020-67562-w</a>)</p> <p>The dataset includes carbon, oxygen and nitrogen stable isotope composition measured in tree rings for four species at twelve forests across climate and atmospheric deposition gradients in Britain. Data were used to i) investigate spatial and temporal (over 30‑years) changes in tree intrinsic water use efficiency (iWUE, i.e., the ratio between CO<sub>2</sub> assimilation - A, and stomatal conductance- g<sub>s</sub>); ii) assess the possible species-specific physiological mechanisms (changes in A and/or g<sub>s</sub>) evaluate whether sites receiving high Ndep experience increase in ecosystem N availability and N saturation (using tree-ring nitrogen isotope composition as a proxy); iv) elucidate drivers of spatial and temporal changes in the isotope-derived physiological and ecological processes (i.e., relative contribution of climate vs. changes in atmospheric CO<sub>2</sub> and nitrogen and sulfur deposition). </p> <p>The following files are available:</p> <ul> <li>CSV file including: a) Site names; b) Species; c) Latitude; d) Longitude; e) Investigated years (1980-2010); f) Measured isotope-related parameters and tree ring nitrogen %. Isotope-related parameters included in the dataset are: 1) delta13C, 2) carbon isotope discrimination (Delta13C), 3) intercellular CO2 concentration (ci) and the ratio of intercellular to atmospheric CO2 concentrations (ci/ca), delta18O, estimated delta18O in precipitation (delta18OP) according to Barbour et al. 2001 (see Method in Guerrieri et al. 2020 Scientific Reports), oxygen isotope discrimination above the source water (Delta18O), delta15N. </li> <li>PDF file reporting the equations used to calculate the isotope-derived parameters, which can also be found in the paper by Guerrieri et al. 2020 Scientific Reports (accepted)</li> </ul>
Chromium reduction and associated stable isotope fractionation restricted to anoxic shelf waters in the Peruvian Oxygen Minimum Zone
<p>Full research data accompanying the publication</p>
Data for Triple Oxygen and Hydrogen Stable Isotope Composition of Water in Murchison Carbonaceous Chondrite
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Dataset and Figure Files for "Evaluating Nitrogen Oxide and α-pinene Oxidation Chemistry: Insights from Oxygen and Nitrogen Stable Isotopes"
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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 MD03-2697.
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 MD03-2697". Claims or attributions were made on Bionomia by volunteer Scribes, <a href="https://bionomia.net/dataset/7c8d2b88-f762-11e1-a439-00145eb45e9a">https://bionomia.net/dataset/7c8d2b88-f762-11e1-a439-00145eb45e9a</a> using specimen data from the dataset aggregated by the Global Biodiversity Information Facility, <a href="https://gbif.org/dataset/7c8d2b88-f762-11e1-a439-00145eb45e9a">https://gbif.org/dataset/7c8d2b88-f762-11e1-a439-00145eb45e9a</a>. Formatted as a Frictionless Data package.
Carbon and oxygen isotope data of foraminifera in coral reef regions
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Moisture-tagging simulation to investigate the link between the moisture sources and interannual oxygen isotope variability of the Indian Summer Monsoon precipitation
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Data from: The application of an oxygen isotope aridity index to terrestrial paleoenvironmental reconstructions in Pleistocene North America
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LBA-ECO CD-02 Carbon, Nitrogen, Oxygen Stable Isotopes in Organic Material, Brazil
This data set reports the measurement of stable carbon, nitrogen, and oxygen isotope ratios in organic material (plant, litter and soil samples) in forest canopy profiles and pasture (grasses and shrubs) as well as corresponding carbon and nitrogen tissue concentrations in a number of different sites across Brazil. The sampling design captured the temporal variation in rainfall over the course of several years. Carbon and nitrogen isotope ratios can act as a proxy for interpreting aspects of the carbon and nitrogen cycles in Amazonian rainforests. Data are in three comma-delimited ASCII files.
LBA-ECO CD-02 Carbon and Oxygen Isotopes in Atmospheric CO2 in the Amazon: 1999-2004
This data set reports carbon and oxygen stable isotope ratios of atmospheric carbon dioxide (CO2) collected at several forest and pasture sites and in the free troposphere over Amazonia. There are three comma-delimited ASCII files with this data set.Atmospheric CO2 concentrations and isotope signatures were measured at ten different forest and pasture canopy sites across the states of Amazonas, Para, and Rondonia within the Brazilian Amazon between March 1999 and March 2004. Both daytime and nighttime profile samples were collected.Samples of CO2 in the troposphere were collected during aircraft flights over the Amazon/Tapajos Rivers, FLONA Tapajos, and pasture/agriculture areas during five days in May 2003 (wet season). Samples were analyzed for carbon and oxygen isotopes of atmospheric CO2. Flights ranged from low altitudes to above the diurnal tropospheric boundary layer.Measurements of carbon and oxygen stable isotope ratios of atmospheric carbon dioxide (CO2) are a powerful indicator of large-scale CO2 exchange on land across multiple spatial scales. Stable carbon isotope composition of leaf tissue and CO2 released by respiration (delta r) can be used as an estimate of changes in ecosystem isotopic discrimination that occur in response to seasonal and interannual changes in environmental conditions, and land-use change (forest-pasture conversion). Understanding of carbon dioxide stable isotope composition can play a central role in influencing our understanding of the extent to which terrestrial ecosystems are carbon sinks.
LBA-ECO CD-02 Oxygen Isotopes of Plant Tissue Water and Atmospheric Water Vapor
This data set reports the oxygen isotope signatures of water extracted from plant tissue (xylem from the stems and leaf tissue) and of atmospheric water vapor from twelve different sites (including both pasture and forest) throughout the Amazon region of Brazil. Samples were collected approximately every 4 months between 1999 and 2003 with additional samples collected monthly between January and May of 2003. In 2004 the collection of water samples from plant tissue continued at two sites, though water vapor collections were discontinued, and measurements of deuterium signatures were added to the analyses. In addition, water vapor from the troposphere was collected during a series of aircraft flights over the Tapajos National Forest in May of 2003 and analyzed for oxygen isotopes using the same methodology. There is one comma-delimited ASCII data file with this data set.
Nitrogen and oxygen isotope signatures of nitrogen compounds during anammox in the lab and in a wastewater treatment plant
<p>Raw data and Berkeley Madonna code files for the curve fitting and denitrification-anammox models. This is from, </p> <p> </p> <p>Syotoku Kotajima, Keisuke Koba*, Daisuke Ikeda, Akihiko Terada, Kazuichi Isaka, Kazuya Nishina, Yuuya Kimura, Akiko Makabe, Midori Yano, Hirotsugu Fujitani, Norisuke Ushiki, Satoshi Tsuneda, and Muneoki Yoh</p> <p> </p> <p>Nitrogen and Oxygen Isotope Signatures of Nitrogen Compounds during Anammox in the Laboratory and a Wastewater Treatment Plant</p> <p> </p> <p>Microbes Environ. 35(4), 2020</p> <p> </p> <p>https://www.jstage.jst.go.jp/article/jsme2/35/4/35_ME20031/_article/-char/en</p> <p> </p>
Magnetic properties of ultramafic rocks in the Troodos ophiolite, with compiled oxygen & hydrogen isotope data and magnetic susceptibility of serpentinites from different tectonic settings
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Raw geochemical data and additional images of: New insights on micro–scale variations of geochemical and oxygen isotope compositions in conodont and shark tooth bioapatite
<p>The files contain the Research Data for the article entitled <strong>'New insights on micro–scale variations of geochemical and oxygen isotope compositions in conodont and shark tooth bioapatite'</strong>. It includes raw geochemical data (stable isotope analysis and elemental analysis) with its respective normalizations, images (scanning electron microscopy) and results from additional samples. Statistical tests are also encompassed. Also, profilometer figures that show samples’ topography are available (please consult the README file). Any doubt or question about these are welcomed by me (Zoneibe Luz) and Torsten Vennemann for discussion or further considerations.</p>
Sulfur and oxygen stable isotopes of sulfate and oxygen isotope of water in Lunar-Lukha River, Meghalaya
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