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171 results for “carbon isotopes”
FIG. 1 in Trophic position of some Late Devonian-Carboniferous (Mississippian) conodonts revealed on carbon organic matter isotope signatures: a case study of the East European basin
FIG. 1. — Localization of the sites under consideration: A, Generalized map of Eastern Europe; rectangles mark the localities: 1, Pechora Craton; 2, Voronezh Anteclise (Kamenka Quarry and Russkiy Brod Quarry sections); 3, Ilmen Lake region (Chudovo section, Syas River section, Ilmen Lake borehole 8, Ilmen Lake section); 4, Chimbulat Quarry. B, Map of Pechora Craton; C, Scheme of outcrops' position in the Kozhva River basin.
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>
Radiocarbon Isotopic Disequilibrium Shows Little Incorporation of New Carbon in Mineral Soils of a Boreal Forest Ecosystem
<p><span>Files for the manuscript “</span><span>Radiocarbon Isotopic Disequilibrium Shows Little Incorporation of New Carbon in Soils and Fast Cycling of a </span><span>Boreal</span><span> Forest Ecosystem”</span></p> <p> </p> <p>1. “Raw_Data” folder contains the files in .xlsx:</p> <p>- Lab_Atmospheric_Samples: D14C results from ambient air at the sampled heights.</p> <p>- Lab_Soil_Respiration: D14C results with date and integration time for the FFSR sampling<span> </span>campaign.</p> <p>- Lab_Solid_Samples:<span> </span>D14C and TOC results for soil, vegetation, roots, fungi and incubation samples.</p>
Chickpea flowering, carbon isotope, seed weight in a factorial of 20 genotypes and 8 environments
<p>Chickpea was phenotyped for time to flowering, carbon isotope composition at peak biomass, and seed weight at maturity in a factorial combining 20 genotypes, 2 sowing dates, 2 sowing regimes over two seasons. </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>
Ocean circulation during the last nine interglacials inferred from carbon 13 isotopes - model outputs
<p>This dataset contains the model output corresponding to the paper entitled "Ocean circulation during the last nine interglacials inferred from carbon 13 isotopes" submitted to Paleoceanography. For the description of the model and simulations we refer to this article.</p> <p>Model outputs:</p> <p>The outputs of two series of simulations can be found in the files.</p> <p>1) MIS experiments:</p> <p>- Atmospheric CO<sub>2</sub> values (ppm) for each interglacial are in: iloveclim_CO2_MIS.txt</p> <p>- Oceanic ð<sup>13</sup>C values (permil) are in:</p> <p>iloveclim_PI_CC.nc for the pre-industrial</p> <p>iloveclim_MISXX.nc for MISXX (XX being 1,5,7,9,11,13,17 or 19)</p> <p> </p> <p>2) Sensitivity experiments</p> <p>- Atmospheric CO<sub>2</sub> values (ppm) are in: iloveclim_CO2_sensitivity_expe.txt</p> <p>- Streamfunction values (Sv) are in:</p> <p>iloveclim_PI-CC_stream.nc for the pre-industrial</p> <p>iloveclim_MIS17_CC_stream.nc for the standard MIS17 simulation</p> <p>iloveclim_MIS17-CC-hosing0.2Sv_stream.nc for the hosing simulation with 0.2sv</p> <p>iloveclim_MIS17-CC-hosing-0.2Sv_stream.nc for the hosing simulations with -0.2Sv</p> <p>iloveclim_MIS17-CC-brines0.4_stream.nc for the simulation with the sinking of brines</p> <p>- Oceanic ð<sup>13</sup>C values (permil) are in:</p> <p>iloveclim_MIS17-CC.nc for the standard MIS17 simulation</p> <p>iloveclim_MIS17-CC-hosing0.2Sv.nc for the hosing simulation with 0.2sv</p> <p>iloveclim_MIS17-CC-hosing-0.2Sv.nc for the hosing simulations with -0.2Sv</p> <p>iloveclim_MIS17-CC-brines0.4.nc for the simulation with the sinking of brines</p>
Dissolved noble gas abundances and inorganic carbon isotopes from Palouse Basin groundwater wells
<p>This data set (.xlsx) contains sampling details and geochemical measurements from 17 groundwater wells in the Palouse Basin (Washington and Idaho, USA). Below is an overview of what each individual tab within the Excel workbook contains:</p> <p>(1) Sample information (coordinates, name, sampling date, and temperature and pH recorded during sampling)</p> <p>(2) Dissolved noble gas abundances (neon, argon, krypon, and xenon)</p> <p>(3) Dissolved inorganic carbon (DIC), radiocarbon activity of DIC and apparent groundwater age, and stable carbon isotope ratio (d13C) of DIC</p> <p> </p> <p>Anyone is welcome (and encouraged) to use these data, but please cite the following publications: </p> <p>Tyne et al., Hidden flux of lithospheric volatiles in shallow groundwater. (submitted)</p> <p>Seltzer et al., Fossil groundwater reveals aquifer sensitivities to climate stress. (submitted).</p>
Surface Sedimentary Black Carbon Concentrations, Fluxes, and Stable and Radiocarbon Isotopes in the Equatorial Atlantic Ocean
<p><strong>Abstract</strong></p> <p>Surface sediments (0-1 cm) obtained from equatorial Atlantic Ocean isolated for black carbon using the chemothermal oxidation at 375 method. Multicores were taken during aboard the R.V. Endeavor (EN651) from February 27th 2020 through March 17th 2020 using a MC-800.</p> <p><strong>Core collection</strong></p> <p>MC-800 tubes were labeled (EN651-“Site number”-MC”coring attempt number”“letter of core”,ex: EN651-01-MC01a) and photographed before sectioning. The water on top of the core was syphoned off and a thin piece of stainless-steel sheet was slid under the foot of the tube. The foot was bent up and the stainless-steel sheet was used to transfer the core to the core extruder. Cores were sectioned at 1 cm intervals down to 10 cm, then 2 cm intervals down to 20 cm, using the piece of stainless-steel and a cake spatula to cut them. The remainder of the core was wrapped in combusted aluminum foil and placed in a zip-lock bag for storage. Sections of cores were stored in amber glass jars placed in a freezer. One core was transferred with the extruder to a PVC tube and capped for archival storage. If 5 or more cores were recovered, 0.5 cm sections would be taken down to 10 cm and the remainder of the core wrapped in foil and zip-lock bagged before being frozen. Due to a limited supply of jars, the 0.5 cm core sections were wrapped in combusted aluminum foil and placed in a ziplock bag before being stored with other samples. All cores and core sections were stored at -20 ̊C.</p> <p><strong>Analytical methods</strong><br>Surface sediment samples (0 – 1 cm) were dried at 60 ˚C until dry and passed through a 420 µm sieve before analysis. Total organic carbon samples were weighed into silver capsules (Elemental microanalysis silver capsules ultra-clean pressed 8 x 5 mm, D2030), acidified to remove inorganic carbon (2 M HCl), and folded into tin capsules (Costech tin capsules 10 x 10 mm, 041073). Black carbon was isolated using the CTO 375 method 34. 100 mg of samples where weighed out into ceramic crucibles and spread into a thin layer prevent charring. Sample were combusted at 375 ˚C for 24 hrs. under the flow of ultra high purity air (0.4 L min<sup>-1</sup>). The remaining sediment was transferred to GC vials for storage, then processed the same as the TOC samples to remove any inorganic carbon present (as detailed above).</p> <p><strong>Sampling equipment</strong></p> <p>Sediment cores were collected using an MC-800</p> <p><strong>Analytical instrumentation</strong></p> <p> An Elemental Analyzer (Costech 4010 Elemental Analyzer) was used for quantification of the BC and TOC fractions. The same elemental analyzer coupled to an Isotope Ratio Mass Spectrometer (Thermo Delta V Advantage) was used for the sample carbon isotopes. Radiocarbon isotopes were measured at the National Ocean Sciences Accelerator Mass spectrometry.</p> <p><strong>Parameter names, descriptions, units</strong></p> <p>Name, "Name of the sediment core from which the top 1 cm was sectioned"<br>Collection Date, "Date the multicore was collected, month/day/year<br>Lat, "Latitude of sampling site", decimal degrees<br>Lon, "Longitude of sampling site", decimal degrees<br>Depth, "Water depth of sample site", meters (m)<br>MAR, "Mass accumulation rate", grams per square centimeters per thousand years (g cm<sup>-2</sup> kyr<sup>-1</sup>), blank = no data<br>TOC, "Total organic carbon concentration", milligrams per gram dry weight (mg g<sup>-1</sup>)<br>TOC d13C, "Total organic carbon δ<sup>13</sup>C value", per mill (‰)<br>TOC D14C, "∆<sup>14</sup>C value of TOC calibrated for a reservoir age of 550 years", per mill (‰), blank = no data<br>BC, "Black carbon concentration", milligrams per gram dry weight (mg g<sup>-1</sup>)<br>BC sd, "Black carbon concentration standard deviation", milligrams per gram dry weight (mg g<sup>-1</sup>)<br>BC d13C, "Black carbon delta <sup>13</sup>C value", per mill (‰), NA<br>BC D14C, "∆<sup>14</sup>C value of the BC", per mill (‰), blank = no data<br>BC flux, "Flux of black carbon to sediments", milligrams per square centimeters per thousand years (mg cm<sup>2</sup> kyr<sup>-1</sup>), blank = no data<br>BC flux sd, "The standard devation of the flux of black carbon to sediments", milligrams per square centimeters per thousand years (mg cm<sup>2</sup> kyr<sup>-1</sup>), blank = no data</p>
Data for Stable isotope composition of long and short term carbon pools can screen drought tolerance in cassava
<p>This repository contains data and scripts to reproduce results that are presented in the article: Van Laere, J., Martinez Maya, M.A., Selvaraj M.G., Becerra Lopez-Lavalle, L.A., Guzman, D., Casas, J.A., Merckx, R., Hood-Nowotny, R., Dercon, G. (2024)<strong> Stable isotope composition of long and short term carbon pools can screen drought tolerance in cassava</strong>. <em>Field Crops Research. </em>https://doi.org/10.1016/j.fcr.2024.109586</p>
Acid fractionation during carbonate digestion with phosphoric acid – Assessment of two different techniques applied for clumped and stable isotope analysis using a Tuneable Infrared Laser Differential Absorption Spectrometer (TILDAS) [dataset]
<p>Date files : </p> <table> <tbody> <tr> <td> <p>Data 1 (Relationship between Mixing ratio difference of sample and WRG and D638 value).xlsx;Data 2 (Role of bulk isotope composition (δ628 & δ636) on Δ638).xlsx;Data 3 (CDES scale conversion).xlsx;Data 4 (VPDB scale conversion for d628 and d636).xlsx;Data 5 (Reference material values).xlsx;Data 6 (Break seal method acid fractionation factor of calcite).xlsx;Data 7 (IAB method acid fractionation factor of calcite).xlsx</p> </td> </tr> </tbody> </table>
Carbon-isotope, geochemical, and biostratigraphic data from the Anchor 3 well, Green Canyon protraction area, Gulf of Mexico
<p>Dataset that accompanies "Carbon-isotope chemostratigraphy, geochemistry, and biostratigraphy of the Paleocene-Eocene Thermal Maximum, deep-water Wilcox Group, Gulf of Mexico (U.S.A.)"</p> <p>To be submitted to <em>Climate of the Past</em></p>
Shatsky Rise, ODP Sites 1209 and 1210 Maastrichtian composite bulk carbonate stable isotopes, XRF scanning, biogenic barium, and benthic foraminiferal records
<p>A bulk composite carbonate stable isotope, X-ray fluorescence (XRF) scanning (elemental barium), biogenic barium and benthic foraminiferal record in deep sea sediments from the tropical Pacific was produced from 71.5 to 66 million years ago to determine variations in carbon export in the Pacific during the Maastrichtian. The cores were drilled on Shatsky Rise in the tropical Pacific at Ocean Drilling Program (ODP) Leg 198 Sites 1209 and 1210. Method details and interpretation are in the publication.</p>
Regional RedOx evolution during the Ediacaran Shuram carbon isotope excursion, Nafun Group, north Oman and southern salt basins Oman
<p><strong>Regional RedOx evolution during the Ediacaran Shuram carbon isotope excursion, Nafun Group, north Oman and southern salt basins Oman</strong></p> <p>Christian J. Bjerrum<sup>1</sup>, Simon R. Stenger<sup>1**</sup>, Anne-Sofie C. Ahm<sup>1***</sup>,</p> <p><em><sup>1</sup>Department of Geoscience and Natural Resource Management, Nordic Center for Earth Evolution, University of Copenhagen, Copenhagen K, Denmark</em></p> <p>*cjb@ign.ku.dk (corresponding author)</p> <p>**Now at the <em>Norwegian Geotechnical Institute, Trondheim, Norway</em></p> <p>***Now at <em>School of Earth and Ocean Sciences, University of Victoria, BC, Canada</em></p> <p>Geochemical dataset related to the regional RedOx evolution during the Ediacaran Shuram carbon isotope excursion. Geochemical analyses include iron-speciation, redox sensitive element and stable carbon and oxygen isotopes. The sub-regional redox changes likely are reflected in the ratio of highly-reactive Fe (FeHR) to total Fe (FeT) and pyrite Fe to FeHR, in combination with redox-sensitive element enrichments (Alcott et al., 2020; Bennett and Canfield, 2020; Poulton and Canfield, 2005).</p> <p></p> <p>Dataset samples are from outcrops in Jabal Akhdar area of northern Oman, and borehole cuttings in southern salt basins Oman (TM-6). Outcrops analyzed record an unusual complete representation of the onset of the Shuram excursion exposed along a tributary to Wadi Hajir just east of the Al Hijir village (23°12'12.0 N and 057°30'56.5 E). Samples from the South Oman Salt Basin are borehole cuttings from the TM-6 well, Petroleum Development Oman (PDO). The Shuram Formation in both sections represent the deepest water facies within sub-regional basins that where paleo-geographically separated by more than 800 km (cf. Le Guerroue et al., 2006). </p> <p></p> <p>From the base to the top the Khufai, Shuram and Buah Formations are part of the The Nafun Group. Limestones and dolostones as part of a prograding shallow marine ramp succession represent the Khufai Formation. The lower Shuram Formation consists of Alternating beds of laminated muddy marls to calcareous mudstones with occasional combined-flow cross-laminated climbing ripples, representing a distal offshore to offshore transitional paleodepositional setting (Le Guerroue et al., 2006). The beds of the lower Shuram Formation grade up into maroon−blue-green verdigris mudstones interbedded with occasional marls and muddy silt beds with combined-flow ripples that represent the middle Shuram Formation. The upper Shuram Formation is composed of interstratified carbonate marls and mudstones where carbonate content increases up section toward the basal Buah Formation.</p> <p></p> <p>During field work in 2015 the section was measured and sampled along the tributary to Wadi Hajir. For convenience the sub-sections are named Wadi Hajir 4, 5 and 6 (WH4-6). WH4 represents the upper part of the Khufai Formation, WH5 the lower Shuram Formation, while WH6 represent the lower part of the middle Shuram Formation. WH4 section is exposed on the southern side of the tributary canyon with a small gap of 0-1 m to the base of WH5. WH5 and WH6 represent a nearly continuous and fully exposed section on the northern side of the canyon.</p> <p>Geochemical dataset include bulk rock:</p> <p>Iron Speciation (Fe<sub>carb</sub>, Fe<sub>ox</sub>, Fe<sub>mag</sub>, Fe<sub>Py</sub>, Fe<sub>tot</sub>)</p> <p>Elements (Mg, Al, Si, K, Ca, Ti, V, Cr, Mn, Fe, Ni, Cu, Zn, As, Rb, Sr, Zr, Mo, Th)</p> <p>Stable isotopes d<sup>13</sup>C, d<sup>18</sup>O</p> <p>C(tot), C(org), S(tot).</p> <p>Global RedOx context of the dataset is presented in Ostrander et al. (2023)</p> <p><strong>Reference</strong></p> <p>Alcott, L.J., Krause, A.J., Hammarlund, E.U., Bjerrum, C.J., Scholz, F., Xiong, Y.J., Hobson, A.J., Neve, L., Mills, B.J.W., Marz, C., Schnetger, B., Bekker, A. and Poulton, S.W. (2020) Development of Iron Speciation Reference Materials for Palaeoredox Analysis. Geostandards and Geoanalytical Research 44, 581-591.</p> <p>Bennett, W.W. and Canfield, D.E. (2020) Redox-sensitive trace metals as paleoredox proxies: A review and analysis of data from modern sediments. Earth-Sci. Rev. 204, 103175.</p> <p>Le Guerroue, E., Allen, P.A. and Cozzi, A. (2006) Chemostratigraphic and sedimentological framework of the largest negative carbon isotopic excursion in Earth history: The Neoproterozoic Shuram. Formation (Nafun Group, Oman). Precambrian Res. 146, 68-92.</p> <p>Ostrander, C.M., Bjerrum, C.J., Ahm, A.-S.C., Stenger, S.R., Bergmann, K.D., El-Ghali, M.A.K., Harthi, A.R., Aisri, Z. and Nielsen, S.G. (2023) Widespread seafloor anoxia during generation of the Ediacaran Shuram carbon isotope excursion. Geobiology.</p> <p>Poulton, S.W. and Canfield, D.E. (2005) Development of a sequential extraction procedure for iron: implications for iron partitioning in continentally derived particulates. Chem. Geol. 214, 209-221.</p> <p></p>
Chickpea flowering, carbon isotope, seed weight in a factorial of 20 genotypes and 8 environments
Open the record for dataset details and reuse information.
Carbon and nitrogen stable isotope values for lake trout from 6 different Arctic lakes near Toolik, Arctic LTER 1987 to 1988.
Lake trout were analysed for carbon and nitrogen stable isotope values in 6 Arctic lakes near Toolik Lake at the Arctic LTER in 1987 and 1988. The fish were also analysed for age using otoliths.
Concentration of dissolved inorganic carbon (DIC), carbon and nitrogen concentrations, C:N ratios and del 13C isotope value for lakes and rivers on North Slope from Brooks Range to Prudhoe Bay, Arctic LTER 1988 to 2005
Composite file describing plant, animal, water, and sediment samples collected at various sites near Toolik Research Station (68 38'N, 149 36'W). Sample site descriptors include an assigned number specific to the file, a number that relates the samples to other samples collected on the same date and time (sortchem), site, date, time, and depth. Samples are identified by type, category, and a short description. Data include isotope values, carbon and nitrogen concentrations, and C:N ratios of samples.
SGS-LTER CO2 Elevation Study: Leaf carbon isotope, nitrogen, carbon and Ci/Ca means from the SGS Open Top Chamber experiment on the Central Plains Experimental Range, Nunn, Colorado, USA 1997 - 2001
This data package was produced by researchers working on the Shortgrass Steppe Long Term Ecological Research (SGS-LTER) Project, administered at Colorado State University. Long-term datasets and background information (proposals, reports, photographs, etc.) on the SGS-LTER project are contained in a comprehensive project collection within the Digital Collections of Colorado (http://digitool.library.colostate.edu/R/?func=collections&collection_id=3429). The data table and associated metadata document, which is generated in Ecological Metadata Language, may be available through other repositories serving the ecological research community and represent components of the larger SGS-LTER project collection. Additional information and referenced materials can be found: http://hdl.handle.net/10217/82454. Carbon isotopes of elevated and ambient OTC plants were measured for use in isotope labeling and plant water-use-efficiency measures. Leaf N and C are associated parameters were also measured. This research was conducted at the Central Plains Experimental Range, near Nunn, CO; lat.40degrees 40 minutes N; long. 104 degrees 45 minutes W in the shortgrass steppe region of NE Colorado, USA and as a collaboration between SGS-LTER and USDA-ARS researchers.
Small shelly fossils and carbon isotopes from the early Cambrian (Stage 3-4) Mural Formation of western Laurentia
<p>The extraordinary window of phosphatised and phosphatic Small Shelly Fossils (SSFs) during the early and middle Cambrian is an important testament to the radiation of biomineralising metazoans. While SSF are well known from most Cambrian palaeocontinents during this time interval, western Laurentia has relatively few SSF faunas. Here we describe a diverse SSF fauna from the early Cambrian (Stage 3-4) Mural Formation at three localities in Alberta and British Columbia, Canada, complemented by carbon isotope measurements at two of the recorded sites to aid in a potential future bio-chemostratigraphic framework.. The fauna expands the recorded SSF assemblage diversity in western Laurentia and includes several brachiopods, four bradoriids, three chancelloriids, two hyoliths, a tommotiid and a helcionellid mollusc as well as echinoderm ossicles and specimens of <i>Microdictyon</i>, <i>Volborthella </i>and <i>Hyolithellus</i>. New taxa include the tommotiid genus <i>Canadiella</i> gen. nov., the new bradoriid species <i>Hipponicharion perforata</i> sp. nov. and <i>Pseudobeyrichona taurata</i> sp. nov. Compared to contemporaneous faunas from western Laurentia, the fauna is rich, particularly in taxa with originally phosphatic shells, which appear to be associated with archaeocyathid buildups. This suggests that the generally low faunal diversity in western Laurentia may be at least partly a consequence of poor sampling of suitable archaeocyathan reef environments. In addition, the tommotiid <i>Canadiella filigrana</i> appears to be of biostratigraphic significance in Cambrian Stage 3 strata of western Laurentia and the unexpected high diversity of bradoriid arthropods in the fauna also suggests that this group may prove useful for biostratigraphic resolution in the region.</p>
Supplementary Data to Dual clumped isotope thermometry resolves kinetic biases in carbonate formation temperatures
<p>In this dataset, we provide analytical and model data to <em>Dual clumped isotope thermometry resolves kinetic biases in carbonate formation temperatures</em> by Bajnai et al. (2020). Also deposited here is the R code that we used to calculate the equations and generate the figures in the manuscript.</p>
Quality control for modern bone collagen stable carbon and nitrogen isotope measurements
<p><strong>(1)</strong> Isotopic analyses of collagen, the main protein preserved in sub fossil bone and tooth, has long provided a powerful tool for the reconstruction of ancient diets and environments. Although isotopic studies of contemporary ecosystems have typically focused on more accessible tissues (e.g., muscle, hair), there is growing interest in the potential for analyses of collagen because it is often available in hard tissue archives (e.g., scales, skin, bone, tooth), allowing for enhanced long-term retrospective studies. The quality of measurements of the stable carbon and nitrogen isotopic compositions of ancient samples are subject to robust and well-established criteria for detection of contaminants and digenesis. Among these quality control (QC) criteria, the most widely utilized is the atomic C:N ratio (C:N<sub>Atomic</sub>), which for ancient samples has an acceptable range between 2.9 and 3.6. While this QC criterion was developed for ancient materials, it has increasingly being applied to collagen from modern tissues.</p> <p><strong>(2)</strong> Here we use a large survey of published collagen amino acid compositions (n<em> </em>= 436) from 193 vertebrate species as well as recent experimental isotopic evidence from 413 modern collagen extracts to demonstrate that the C:N<sub>Atomic</sub> range used for ancient samples is not suitable for assessing collagen quality of modern and archived historical samples.</p> <p><strong>(3) </strong>For modern tissues, collagen C:N<sub>Atomic</sub> falling outside 3.00–3.30 for fish and 3.00–3.28 for mammals and birds can produce systematically skewed isotopic compositions and may lead to significant interpretative errors. These findings are followed by a review of protocols for improving C:N<sub>Atomic</sub> criteria for modern collagen extracts.</p> <p><strong>(4)</strong> Given the tremendous conservation and environmental policy-informing potential that retrospective isotopic analyses of collagen from contemporary and archived vertebrate tissues have for addressing pressing questions about long-term environmental conditions and species behaviours, it is critical that QC criteria tailored to modern tissues are established.</p>
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Allen Brain Atlas
Allen Brain Atlas is an Allen Institute collection of brain map atlases, datasets, APIs, and analysis tools covering mouse, human, and non-human primate brain resources.
Annotated Behaviour and Observability Dataset (ABODe)
ABODe is a University of Edinburgh DataShare dataset for behavior classification in group-housed mice using home-cage video, identities, bounding boxes, ground-plate positions, and annotator labels.
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
OpenNeuro is a free, open platform for sharing neuroimaging datasets, with public search, dataset pages, and download paths for web, S3, DataLad, and the OpenNeuro CLI.