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96 results for “oxygen isotopes”
Data from: Oxygen isotope composition of teeth suggests endothermy and possible migration in some Late Cretaceous shark taxa from the Gulf Coastal Plain, USA
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Decadal oscillations in the ocean's largest oxygen-deficient zone - coral isotopes records & linear extension rates
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The oxygen isotope compositions of large numbers of small cosmic spherules: Implications for their sources and the isotopic composition of the upper atmosphere
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Data from: Enriched East Asian oxygen isotope of precipitation indicates reduced summer seasonality in regional climate and westerlies
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Temperature control on high-resolution SIMS oxygen isotopic compositions in Porites coral skeletons
<p>The dataset includes all data for "Temperature control on high-resolution SIMS oxygen isotopic compositions in Porites coral skeletons" by Zou et al. from Guangzhou Institute of Geochemistry.</p>
Data from: Endothermic mosasaurs? Possible thermoregulation of Late Cretaceous mosasaurs (Reptilia, Squamata) indicated by stable oxygen isotopes in fossil bioapatite in comparison with coeval marine fish and pelagic seabirds
The thermoregulatory style of Late Cretaceous mosasaurs has become a highly controversial subject in vertebrate palaeontology. These extinct marine reptiles have previously been described as poikilothermic, endothermic or gigantothermic. Here we analyse three genera of mosasaurs from the Mooreville Chalk in Alabama (USA) of differing body mass, and compare their δ18OPO4 derived body temperatures (Tb) with those of coeval poikilothermic fish (Enchodus) and endothermic pelagic seabirds (Ichthyornis). Results show that all mosasaurs, Clidastes (Tb = 33.1°C), Platecarpus (Tb = 36.3°C), and Tylosaurus (Tb = 34.3°C), had elevated average body temperatures in relation to those of the fish (Tb = 28.3°C) and were closer to those of Ichthyornis (Tb = 38.6°C). The temperatures calculated for Enchodus compare well with previously reported temperature estimates for the Mooreville Chalk and the Tb of Ichthyornis compares well with temperatures that have been reported for modern seabirds, suggesting that this method provides accurate results. Finally, although there are small differences of body temperature among mosasaur genera, these are independent of size, and thus inferred body mass, suggesting that mosasaurs were not gigantotherms, but rather endotherms.
Data from: Leaf carbon and oxygen isotopes are coordinated with the leaf economics spectrum in Mediterranean rangeland species
The leaf economics spectrum (LES) describes covariation of traits relevant to carbon and nutrient economics across plant species, but much less is known about the relationship between the LES and leaf water economy. We propose an approach combining the measurement of two leaf traits related to water use economy, leaf carbon (δ13C) and oxygen (δ18O) isotopic composition, and the measurement of leaf morphological and nutrient traits to investigate the link between leaf carbon and nutrient economics and water use. We tested the relationships between leaf traits linked to carbon and nutrient use within the LES and water use traits using leaf δ18O as a proxy of stomatal conductance (gs) and δ13C as a proxy of intrinsic water use efficiency (WUEi) across 15 Mediterranean rangeland species grown in an irrigated common garden and in a natural grassland in Southern France. The target species spanned a wide range of variation in leaf morphological and nutrient trait values and a wide range of leaf δ18O and δ13C values. PCA analysis revealed multiple associations among leaf morphology, nutrients and isotopic composition, with the first axis alone explaining 56.0% of the total variation across species. Leaf δ18O and δ13C covaried with leaf morphology and leaf nutrient concentrations along a single resource use axis. Species with high leaf δ18O and δ13C (low gs and high WUEi) exhibited a resource-conservative strategy (high LDMC, low leaf N, P and K) whereas species with low leaf δ18O and δ13C (high gs and low WUEi) showed a more resource-acquisitive strategy (high SLA and leaf N, P and K). These leaf trait syndromes and resource use strategies were strongly conserved across sites with contrasting environmental conditions, indicating that foliar δ18O and δ13C can be included as an integral part of the LES for this set of rangeland species. Overall, the data suggest a tight coupling and coordination between water, carbon and nutrient use strategies across herbaceous plant species. A dual δ18O and δ13C isotope approach combined with LES trait measurements is a promising tool to more comprehensively assess the diversity of resource use strategies among coexisting plant species.
Methner et al., "Triple Oxygen Isotope Paleoaltimetry of the Kettle Metamorphic Core Complex (WA, USA)"
<p>Data set to Methner et al., "Triple Oxygen Isotope Paleoaltimetry of the Kettle Metamorphic Core Complex (WA, USA)" submitted to Tectonics</p>
Carbon and oxygen isotope data (550 B.C. to 950 A.D.) from Basura cave (BA14-1), northern Italy
<p>This dataset contains the carbon and oxygen isotope data during 550 B.C. to 950 A.D. from Basura cave, northern Italy (BA14-1)</p>
Mean tree ring oxygen isotope chronologies from Ecuador and Bolivia
<p>Tree ring oxygen isotope data accompanying the paper 'The changing Amazon hydrological cycle – inferences from over 200 years of tree-ring oxygen isotope data' in JGR Biogeosciences.</p>
Data from the paper: D. Malko and A. Kucernak, "Kinetic isotope effect in the oxygen reduction reaction (ORR) over Fe-N/C catalysts under acidic and alkaline conditions", Electrochemistry Communications,2017, https://doi.org/10.1016/j.elecom.2017.09.004
<p>Data used to generate the figures in the paper: D. Malko and A. Kucernak, "Kinetic isotope effect in the oxygen reduction reaction (ORR) over Fe-N/C catalysts under acidic and alkaline conditions", Electrochemistry Communications,2017, https://doi.org/10.1016/j.elecom.2017.09.004</p> <p> </p>
Diverse Orbital-scale Variations of Precipitation Oxygen Isotopes in the Northern Hemisphere Mid-latitudes: A Comparative Study Between East Asia and North America
<p>The isotope-enabled climate model output data and the corresponding NCL codes used for the paper "Li et al., 2024: Diverse orbital-scale variations of precipitation oxygen isotopes in the Northern Hemisphere mid-latitudes: A comparative study between East Asia and North America".</p>
Pulleniatina obliquiloculata stable oxygen isotope and Mg/Ca ratios record from IODP Core 363-U1483
<p><span>We carry out our work on a total of 202 sediment samples spanning the past ~400 kyr from IODP Core 363-U1483 (13.09°S, 121.80°E; water depth: 1733 m), which was recovered at the Timor Sea in the outflow area of the Indonesian Throughflow. In this study, we present Mg/Ca ratios and stable oxygen isotope from tests of planktonic foraminiferal Pulleniatina obliquiloculata, respectively.</span></p>
SW Gulf of Mexico planktonic foraminifera, oxygen isotopes and Mg/Ca data from core RC10-265PC spanning MIS 6 to MIS 1
<p>In the sediment Core RC10-265PC collected in the oligotrophic region of the SW Gulf of Mexico, it was reconstructed the surface ocean conditions, including water masses, the mixed layer depth and the sea surface temperatures over the Late Pleistocene to Holocene (last 180 cal ka BP). This database includes (Table S1) the counting and distribution of planktonic foraminifera assemblages, and (Table S2) stable oxygen isotopes (δ<sup>18</sup>O-PDB) (‰) of <em>Globigerinoides ruber</em> (white) and elemental ratios of Mg/Ca (mmol/mol), Mn/Ca (mmol/mol), Fe/Ca (mmol/mol), Sr/Ca (mmol/mol), Mn/Fe (mmol/mol).</p>
DATA: Oxygen isotope composition of final chamber of planktic foraminifera provides evidence for vertical migration and depth integrated growth
<p>Dataset from "Oxygen isotope composition of final chamber of planktic foraminifera provides evidence for vertical migration and depth integrated growth". Three files that represent: all data (stable isotope, weight, size) for T. sacculifer; all data (stable isotope, weight, size) for G. ruber and N.dutertrei and individual final chamber and remaining shell for T. sacculifer.</p>
Globigerinoides ruber stable oxygen isotope and Mg/Ca ratios record from IODP Core 363-U1483
<p>We carry out our work on a total of 202 sediment samples spanning the past ~400 kyr from IODP Core 363-U1483 (13.09°S, 121.80°E; water depth: 1733 m), which is located close to the southern margin of the ITCZ's latitudinal displacement in the outflow area of the Indonesian Throughflow. In this study, we present Mg/Ca ratios and stable oxygen isotope from tests of planktonic foraminiferal Globigerinoides ruber, respectively.</p>
Datsets and RF model for oxygen isotopic compositions at Chichijima
<p>The datasets in the uploaded file include quarterly data of observed ions and oxygen-17 excess as well as predicted oxygen-17 excess between 2001 abd 2011. On the other hand, the RF model is also uploaded.</p>
New insights on micro-scale variations of geochemical and oxygen isotope compositions in conodont and shark tooth bioapatite: Datasets
<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>. A table of contents is provided. In summary, the files are: the raw geochemical data (scanning electron microscopy, electron microprobe analysis, stable isotope analysis), and profilometer images showing samples’ topography (please consult the README file) used in the referred article. The data normalisation was given as Supplementary Data in the publication. Any doubt or question about these are welcomed by me (Zoneibe Luz) for discussion or further considerations.</p>
Data from: Endothermic mosasaurs? Possible thermoregulation of Late Cretaceous mosasaurs (Reptilia, Squamata) indicated by stable oxygen isotopes in fossil bioapatite in comparison with coeval marine fish and pelagic seabirds
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Data from: Leaf carbon and oxygen isotopes are coordinated with the leaf economics spectrum in Mediterranean rangeland species
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Allen Brain Atlas
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DANDI Archive for NWB datasets
DANDI is a BRAIN Initiative archive for publishing and sharing neurophysiology data, including electrophysiology, optophysiology, and behavioral data packaged as NWB and related standards.
International Brain Laboratory public data
The International Brain Laboratory public data releases expose standardized mouse decision-making experiments, including Neuropixels recordings, widefield calcium imaging, behavior, and session metadata accessed through the ONE API.
OpenNeuro
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