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96 results for “oxygen isotopes”
A non‐steady state model based on dual nitrogen and oxygen isotopes to constrain moss nitrate uptake and reduction
<p><span><span>Epilithic mosses are early colonizers of the terrestrial biosphere, constitute a special ecosystem regulating rock-atmosphere interactions, and may be more restricted in their nitrogen (N) supply than other mosses.<sup> </sup>Terrestrial mosses can take up nitrate (NO<sub>3</sub><sup>-</sup>), a major form of bioavailable N, from soil substrates. However, the importance of substrate NO<sub>3</sub><sup>-</sup> relative to atmospheric NO<sub>3</sub><sup>-</sup> remains unclear in moss NO<sub>3</sub><sup>-</sup> utilization. This has prevented the understanding of moss NO<sub>3</sub><sup>-</sup> dynamics and its responses to environmental N loadings. Here we investigated the monthly concentrations, δ<sup>15</sup>N, and δ<sup>18</sup>O of NO<sub>3</sub><sup>-</sup> in four epilithic moss species from August, 2006 to August, 2007 in Guiyang, southwestern China. We developed a non-steady state isotope mass-balance model based on dual N and O isotopes to evaluate fractional contributions of atmospheric NO<sub>3</sub><sup>-</sup> (<i>Ф</i><sub>atm</sub>) and soil NO<sub>3</sub><sup>-</sup> (<i>Ф</i><sub>soil</sub>), moss NO<sub>3</sub><sup>-</sup> uptake flux (<i>F</i><sub>influx</sub>), moss NO<sub>3</sub><sup>-</sup> reduction flux (<i>F</i><sub>reduction</sub>), and the percentage of NO<sub>3</sub><sup>-</sup> reduction in total NO<sub>3</sub><sup>-</sup> uptake of mosses (expressed as <i>f</i><sub>reduced</sub>). Monthly <i>Ф</i><sub>soil</sub> values averaged 53 ± 13% and monthly <i>f</i><sub>reduced</sub> values averaged 50 ± 35%. Both monthly<i> F</i><sub>reduction</sub> and <i>f</i><sub>reduced</sub> values increased with monthly <i>F</i><sub>influx</sub> values, particularly when <i>Ф</i><sub>soil</sub> values were higher than <i>Ф</i><sub>atm</sub> values. However, the amount of annual NO<sub>3</sub><sup>-</sup> reduction (219.7 ± 30.5 μg-N/g, dw) accounted for only 1.0 ± 0.2% in bulk N of mosses. We conclude that half of NO<sub>3</sub><sup>-</sup> in epilithic mosses is derived from soil NO<sub>3</sub><sup>-</sup> and that NO<sub>3</sub><sup>-</sup> uptake from soil induces moss NO<sub>3</sub><sup>-</sup> reduction, but the total NO<sub>3</sub><sup>-</sup> assimilation contributed a low fraction to total N of study mosses. These findings are important for understanding N sources and dynamics in terrestrial mosses.</span></span></p>
Triple oxygen isotope data from Waquoit Bay, MA
<p>Measurements of the triple oxygen isotopic composition of O2 from Waquoit Bay, Massachusetts, USA, obtained in 2010. </p>
Grain size and clay mineralogy data of the Esplugafreda sequence (Spain) with stable carbon, oxygen and clumped isotope data of soil carbonates
<p>This datasets contains 1) grain size distribution data of mudstone paleosols of the Esplugafreda sequence (Esplugafreda and Claret Formations) measured by laser diffraction, and 2) clay mineralogy measured by powder X-ray diffraction, as well as 3) stable carbon, oxygen and clumped (D47) isotope compositions of soil carbonates. The Esplugafreda sequence is found in the Tremp-Graus Basin in the southern forefront of the Pyrenees and consists of continental sediments formed in a coastal alluvial setting during the late Paleocene and early Eocene.</p> <p>In addition, a proxy dataset of late Paleocene and PETM continental temperatures of the northern hemisphere is also included.</p>
Stable oxygen and hydrogen isotope values for permafrost ice, rain, and snow collected near Fairbanks, Alaska and a summary of all age dates from the CRREL Permafrost Tunnel
<p>Stable oxygen and hydrogen isotope values for permafrost ice, rain, and snow collected near Fairbanks, Alaska as well as a summary of all age dates from the CRREL Permafrost Tunnel</p><p>Please contact me for more information or to use the data.</p><p>thomas.a.douglas@usace.army.mil</p>
Meterological and stable carbon, oxygen and clumped isotope data of land snails Clausilia pumila, Succinella oblonga and Trochulus hispidus from Europe
<p>These data include site information and collection dates of land snails (Clausilia pumila, Succinella oblonga and Trochulus hispidus), meteorological data of collection sites of molluscs derived using the ClimateEU software, as well as carbon, oxygen and clumped isotope compositions of snail shells of the mentioned three species from culturing experiments and natural populations across Europe. During the laboratory experiments individuals of the three species were kept at 12, 18 and 24 Celsius temperatures in climate chambers, fed exclusively by fresh lettuce and humidity was controlled using tap water (d18O: -9.29+-0.52 permil, V-SMOW). d13C, 18O and D47 values of snail shells from lab experiments and field-collections were determined in two laboratories (Isnt. for Nuclear Research, Debrecen, and Geological Institute, ETH Zürich) using IRMS. Detailed analysis and interpretations of the results obtained can be read in the original publication. </p>
Data from: Disequilibrium oxygen isotope distribution among aqueously altered minerals in Ryugu asteroid returned samples
<p>Oxygen 3-isotope ratios of magnetite and carbonates in aqueously altered carbonaceous chondrites provide important clues to understanding the evolution of the fluid in the asteroidal parent bodies. We conducted oxygen 3-isotope analyses of magnetite, dolomite, and breunnerite in two sections of asteroid Ryugu returned samples, A0058 and C0002, using a secondary ion mass spectrometer (SIMS). Magnetite was analyzed by using a lower primary ion energy that reduced instrumental biases due to the crystal orientation effect. We found two groups of magnetite data identified from the SIMS pit morphologies: (1) higher δ<sup>18</sup>O (from 3‰ to 7‰) and ∆<sup>17</sup>O (~2‰) with porous SIMS pits mostly from spherulitic magnetite, and (2) lower δ<sup>18</sup>O (~ –3‰) and variable ∆<sup>17</sup>O (0-2‰) mostly from euhedral magnetite. Dolomite and breunnerite analyses were conducted using multi-collection Faraday cup detectors with precisions ≤0.3‰. The dependence of instrumental biases on carbonate compositions was corrected using two methods, using Fe and (Fe+Mn) contents, because Ryugu dolomite contains higher amounts of Mn than the terrestrial standard. Results of dolomite and breunnerite analyses show a narrow range of ∆<sup>17</sup>O; 0.0–0.3‰ for dolomite in A0058 and 0.2–0.8‰ for dolomite and breunnerite in C0002. The majority of breunnerite, including large ≥100 µm grains, show systematically lower δ<sup>18</sup>O (~21‰) than dolomite (25–30‰ and 23–27‰ depending on the instrumental bias corrections). The equilibrium temperatures between magnetite and dolomite from the coarse-grained lithology in A0058 are calculated to be 51±11˚C and 78±14˚C, depending on the instrumental bias correction scheme for dolomite; a reliable temperature estimate would require a Mn-bearing dolomite standard to evaluate the instrumental bias corrections, which is not currently available. These results indicate that oxygen isotope ratios of aqueous fluids in the Ryugu parent asteroid were isotopically heterogeneous, either spatially or temporally. Initial water ice accreted to the Ryugu parent body might have ∆<sup>17</sup>O >2‰ that was melted and interacted with anhydrous solids with the initial ∆<sup>17</sup>O <0‰. In the early stage of aqueous alteration, spherulitic magnetite and calcite formed from aqueous fluid with ∆<sup>17</sup>O ~2‰ that was produced by isotope exchange between water (∆<sup>17</sup>O >2‰) and anhydrous solids (∆<sup>17</sup>O <0‰). Dolomite and breunnerite along with some magnetite formed at a later stage of aqueous alteration under higher water-to-rock ratios and the oxygen isotope ratios were nearly at equilibrium between fluid and solid phases. Including literature data, δ<sup>18</sup>O of carbonates decreases in the order of calcite, dolomite, and breunnerite, suggesting that the temperature of alteration might have increased with the degree of aqueous alteration.</p>
The Relations between Summer Droughts/Floods and Oxygen Isotope Composition of Precipitation in Dongting Lake Basin
<p>This is the precipitation amount and stable isotope composition of precipitation data on monthly timescale from Jan 1979 to Dec 2017 over the Dongting Lake Basin, Central-shouthern China. This is simulated data from isoGSM2.</p> <p> </p>
The oxygen isotope of phosphate in the East China Sea in 2020
<p>For the analysis of the main sources of phosphate in the ESC during summer, we choose the area between 120.93 ˚ E-125.9 ˚ E and 26.08˚ N-32.35 ˚ N as research sites . The samples were all from the voyage of the research ship (Xiangyanghong 18). Surface seawater was collected at 49 stations for δ<sup>18</sup>O<sub>p</sub> analysis by a conductivity-temperature-depth profiler. Then we utilized δ<sup>18</sup>O<sub>p</sub> to trace the source of phosphate in the ESC. </p> <p>The δ<sup>18</sup>O<sub>p</sub> values in seawater are affected by water masses with different phosphate concentrations.We need the two-component mixing model for the analysis of water masses that control phosphate.In this research, atmospheric deposition and adjacent sea transportation were used as terrestrial and seawater end-members respectively to construct the δ<sup>18</sup>O<sub>p</sub> end-member mixing model.</p> <p>In order to quantify the source of phosphate in the sea, a Bayesian isotope mixing model run in the R software package (Stable Isotope Analysis in R, SIAR) was selected for analysis.</p>
Oxygen/argon, triple oxygen isotope, and CTD data from Bras d'Or Lake, Nova Scotia, Canada
<p>Oxygen/argon, triple oxygen isotope, and CTD data from Bras d’Or Lake, Nova Scotia, Canada collected in March and April 2013.</p>
Southeast Greenland firn core FC-23-A - Depth, density, and oxygen isotope data
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Dataset: Stable oxygen and carbon isotopes in freshwater pearl mussels from ultrastructurally distinct shell portions
<p>Oxygen isotopes in stream water can serve as natural tracers of watershed dynamics. Freshwater pearl mussels provide δ<sup>18</sup>O<sub>water</sub> estimates that overcome temporal and spatial limitations of instrumental records. The reliability of shell‑based δ<sup>18</sup>O<sub>water</sub> reconstructions depends on understanding which shell layer biomineralizes closer to oxygen isotopic equilibrium with ambient water<em>.</em></p> <p>This dataset contains isotope data obtained from freshwater pearl mussel shells<em>,</em> as discussed in the article titled "Biologically driven isotope fractionation in ultrastructurally different shell portions of freshwater pearl mussels <em>(Margaritifera margaritifera):</em> Implications for stream water δ<sup>18</sup>O reconstructions".</p> <p>The dataset includes δ<sup>18</sup>O and δ<sup>13</sup>C values from field-collected and tank-reared bivalve shells, complemented by <em>in-situ</em> δ<sup>18</sup>O<sub>water</sub> measurements from the tanks and shell growth rates of the tank-reared specimens.</p>
Supplementary dataset for: Carbonate Clumped Isotope Constraints on Early Triassic NeoTethyan Seawater Oxygen Isotope Compositions and Temperatures
<p><span>The dataset includes data generated for the study titled:</span> <strong><span>Carbonate Clumped Isotope Constraints on Early Triassic NeoTethyan Seawater Oxygen Isotope Compositions and Temperatures</span></strong></p> <p><span>The Excel file includes </span></p> <ol> <li><span>Clumped isotope data for analyzed brachiopod calcites, bulk rock micrite, as well as analytical standards (Tables S1 and S2).</span></li> <li><span>Rare Earth element concentration data for brachiopod samples analyzed (Table S3)</span></li> <li><span>Element/Ca ratios for analyzed samples (Table S4).</span></li> </ol> <p> </p> <p> </p>
Stable isotope data for oxygen and hydrogen and electron microprobe data in phyllosilicates and clumped isotopes of carbonates from paleosols, Illinois Basin, USA
<p>Datasets including stable isotope data for oxygen and hydrogen of phyllosilicates, electron microprobe data of phyllosilicates, and clumped isotope data of carbonates from paleosols of the Illinois Basin, accompanying publication.</p>
Intra-annual-tree-ring-stable-carbon-and-oxygen-isotope-of-Chinese-pine-in-Helan-Mountains
<p>The data are intra-annual series of tree-ring stable carbon (δ<sup>13</sup>Ccor) and oxygen (δ<sup>18</sup>O) isotopes from Chinese pine (<em>Pinus tabuliformis</em>) in Helan Mountains</p>
Oxygen isotope constraints on the ventilation of the modern and glacial Pacific: Water fractions and the associated errors
<p>There is two associated datasets linked to the study: Oxygen isotope constraints on the ventilation of the modern and glacial Pacific.</p> <p>One whch contains the values of the 4 end-memebrs defined in the study, and the other one represent the error associated to the reconstruction of each parameter based on the fractions calculated.</p>
Inter-method differences (SIMS vs. IRMS) in oxygen isotope fractionation: Insights from Chinook salmon otoliths
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Can oxygen isotopes in tree rings be used to detect stomatal responses to global change?
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Data from: Disequilibrium oxygen isotope distribution among aqueously altered minerals in Ryugu asteroid returned samples
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Data from: Assessing fish movement and physiological traits along a salinity gradient by measuring stable oxygen isotope values in fish blood water and muscle water
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A non‐steady state model based on dual nitrogen and oxygen isotopes to constrain moss nitrate uptake and reduction
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OpenNeuro
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