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88 results for “radiocarbon”
Lithic, faunal, and radiocarbon dating data from Bukhtarma Cave, East Kazakhstan
<p>Data associated with the paper "<span>A newly dated late Pleistocene and Holocene archaeological assemblage from Bukhtarma Cave in the southern Altai piedmont, East Kazakhstan," containing the zooarchaeological identification and analysis, the lithic analysis, and the radiocarbon dates obtained from the 14C dating lab of the Curt Engelhorn Zentrum für Archäometrie, Mannheim, Germany (co-author S. Lindauer). </span></p>
Radiocarbon dates from Sri Ksetra Myanmar
<p>Radiocarbon dates for samples from archaeological excavations at Sri Ksetra, Myanmar. Funded by ERC synergy project 609823 Asia Beyond Boundaries: Religion, Region, Language and the State.</p>
Catalogue of radiocarbon determinations & dendrochronology dates
<p>Catalogue of Irish radiocarbon determinations & dendrochronology dates. August 2019 Release</p> <p>See 'Citation & Restrictions' tab on resource for restrictions on usage</p>
Text-fig. 4. Pollen diagram from Stará Jímka Lake in the Bohemian Forest (Analysed by E. Břízová). Radiocarbon dating: Radiocarbon Laboratory Gliwice, Poland. in Quillwort (Isoëtes), A Mysterious Plant From The Czech Republic
Text-fig. 4. Pollen diagram from Stará Jímka Lake in the Bohemian Forest (Analysed by E. Břízová). Radiocarbon dating: Radiocarbon Laboratory Gliwice, Poland.
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>
EXPLO. Sovjan 2021. OxCal code for radiocarbon dated tree-rings and charcoal
<p>Code used for modelling radiocarbon dated tree-rings and previously published charcoal dates from the archaeological site of Sovjan. Software used: OxCal v4.4.2 (Bronk Ramsey, 2020; Dee and Bronk Ramsey, 2014) presented in "<em>The Early Bronze Age dendrochronology of Sovjan (Albania): A first tree-ring sequence of the 24th – 22nd c. BC for the southwestern Balkans</em>", Maczkowski et al., 2021, DOI: <a href="http://dx.doi.org/10.1016/j.dendro.2021.125811">10.1016/j.dendro.2021.125811</a></p>
The name of the game: Palaeoproteomics and radiocarbon dates further refine the presence and dispersal of caprines in Eastern and Southern Africa
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Evidence for multi-decadal fuel buildup in a large California wildfire from smoke radiocarbon measurements
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Radiocarbon and del 13C was determined on dissolved organic carbon collected from Imnavait Creek 1990 and 1991.
Del 13C was determined on dissolved organic carbon from Imnavait Creek water collected from the fourth pond upstream of the Imnavait Creek flume in 1990 and 1991. Radiocarbon was determined on a sample in each year.
Radiocarbon dates for an elevational gradient by Toolik Lake, North Slope of Alaska 1988.
Two cores of peat, approximately 15 cm2, were cut to the depth at which mineral soils were encountered at each site. The sites of sampling correspond to an elevational gradient leading from the lakeside upslope to the begining of the water track at the ridgetop. Each sample was divided into three sections, one section to be used for radiocarbon age , one for loss on ignition, and the remainder to be kept for future needs.
Eight Mile Lake Research Watershed, Thaw Gradient, The radiocarbon value of ecosystem respiration, 2004-2012 I: Reco.
In this larger study, we are asking the question: Is old carbon that comprises the bulk of the soil organic matter pool released in response to thawing of permafrost? We are answering this question by using a combination of field and laboratory experiments to measure radiocarbon isotope ratios in soil organic matter, soil respiration, and decomposition in tundra ecosystems. The objective of these proposed measurements is to develop a mechanistic understanding of the SOM sources contributing to C losses following permafrost thawing. We are making these measurements at an established tundra field site near Healy, Alaska in the foothills of the Alaska Range. Field measurements center on a natural experiment where permafrost has been observed to warm and thaw over the past several decades. This area represents a gradient of sites each with a different degree of change due to permafrost thawing. As such, this area is unique for addressing questions at the time and spatial scales relevant for change in arctic ecosystems. This data set includes the growing season radiocarbon values of ecosystem and plant respiration at the thaw gradient and CiPEHR (a permafrost warming experiment). Depending on the year, the measurements were taken monthly during the growing season or just once a growing season.
Eight Mile Lake Research Watershed, Thaw Gradient, The radiocarbon value of ecosystem respiration, 2004-2012 II: Rplant.
In this larger study, we are asking the question: Is old carbon that comprises the bulk of the soil organic matter pool released in response to thawing of permafrost? We are answering this question by using a combination of field and laboratory experiments to measure radiocarbon isotope ratios in soil organic matter, soil respiration, and decomposition in tundra ecosystems. The objective of these proposed measurements is to develop a mechanistic understanding of the SOM sources contributing to C losses following permafrost thawing. We are making these measurements at an established tundra field site near Healy, Alaska in the foothills of the Alaska Range. Field measurements center on a natural experiment where permafrost has been observed to warm and thaw over the past several decades. This area represents a gradient of sites each with a different degree of change due to permafrost thawing. As such, this area is unique for addressing questions at the time and spatial scales relevant for change in arctic ecosystems. This data set includes the growing season radiocarbon values of ecosystem and plant respiration at the thaw gradient and CiPEHR (a permafrost warming experiment). Depending on the year, the measurements were taken monthly during the growing season or just once a growing season.
Eight Mile Lake Research Watershed, Thaw Gradient, The radiocarbon value of ecosystem respiration, 2004-2016 III: Atm.
In this larger study, we are asking the question: Is old carbon that comprises the bulk of the soil organic matter pool released in response to thawing of permafrost? We are answering this question by using a combination of field and laboratory experiments to measure radiocarbon isotope ratios in soil organic matter, soil respiration, and decomposition in tundra ecosystems. The objective of these proposed measurements is to develop a mechanistic understanding of the SOM sources contributing to C losses following permafrost thawing. We are making these measurements at an established tundra field site near Healy, Alaska in the foothills of the Alaska Range. Field measurements center on a natural experiment where permafrost has been observed to warm and thaw over the past several decades. This area represents a gradient of sites each with a different degree of change due to permafrost thawing. As such, this area is unique for addressing questions at the time and spatial scales relevant for change in arctic ecosystems. This data set includes the growing season radiocarbon values of ecosystem and plant respiration at the thaw gradient and CiPEHR (a permafrost warming experiment). Depending on the year, the measurements were taken monthly during the growing season or just once a growing season.
Radiocarbon content of soil carbon and respired CO2 near T-Van from 2012 to 2015, Seasonal
To test the hypothesis that old carbon may be contributing to the carbon source strength of alpine tundra near T-Van, a chamber (growing season) and two types of subsurface gas wells (remainder of the year) were used to collect respired carbon dioxide samples for radiocarbon analysis from four locations across a soil moisture gradient near T-Van between 2012 and 2015. Near surface soil samples (~10 cm depth) from each site were additionally collected and density fractionated in order to model the contribution of various carbon pools to respired carbon fluxes on a seasonal basis through time. All samples were purified and graphitized by the INSTAAR Laboratory for AMS Radiocarbon Preparation and Research at the University of Colorado Boulder, then shipped to the Keck Carbon Cycle AMS Lab at the University of California, Irvine for analysis.
Radiocarbon content of carbon dioxide, methane, dissolved organic carbon and particulate organic carbon from the northern permafrost region and other studies
<p>The dataset includes <sup>14</sup>C measurements of CO<sub>2</sub>, CH<sub>4</sub>, DOC and POC mostly from the northern permafrost region. Some other studies are included from sites not underlained by permafrost. The dataset focuses on <sup>14</sup>C measurements of gaseous soil emissions and waterborne ecosystem C fluxes but the database also included C forms belowground, such as soil gases and pore water DOC. </p>
Surveyed terrace profiles and terrace radiocarbon ages, western Jumgal basin, Tien Shan, Kyrgyz Republic
<p>This archive contains survey data and radiocarbon ages from deformed terraces in the western Jumgal basin, Kyrgyz Republic. These data support analysis by Coddington and Burgette (2020) to be published in <em>Tectonics</em>: “Fold kinematics and fault slip rates from progressively deformed terraces: Implications for structural evolution of basins in the Kyrgyz Tien Shan” </p>
Moisture and temperature effects on the radiocarbon signature of respired carbon dioxide to assess stability of soil carbon in the Tibetan Plateau
<p>Radiocarbon data set and code for the prediction of D14C values in bulk soil and respired CO2.</p> <p>Lab results for TOC, TN, TIC, Dap and physico-chemical properties of grassland and peatland soils</p> <p> </p>
Shuttle Radar Topography Mission digital elevation models, data points, radiocarbon dates, and geochemical data for the Rub' al Khali Desert
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Radiocarbon and 13C measurements from Joshua Tree National Park, USA
<p>These data include radiocarbon and 13C measurements made on surface soil and incubations from samples taken from the Pinto Basin N amendment experiments started by Edith B. Allen and collaborators in Joshua Tree National Park. The site and experiment description can be found in:</p> <p>Allen, E. B., L. E. Rao, R. J. Steers, A. Bytnerowitcz, and M. E. Fenn. 2009. Impacts of atmospheric nitrogen deposition on vegetation and soils in Joshua Tree National Park. Pages 78–100 in R. H. Webb, L. F. Fenstermaker, J. S. Heaton, D. L. Hughson, E. V. McDonald, and D. M. Miller, editors. The Mojave Desert: Ecosystem processes and sustainability. University of Nevada Press, Las Vegas, Nevada, USA.</p> <p>Samples were taken and processed by Nicole M. Nowinski at the WM Keck Carbon Cycle AMS facility at UC Irvine.</p> <p>An image of the site can be found at this web site:<br> https://www.nps.gov/articles/parkscience32_2_64-66_bell_allen_3838.htm</p> <p>The associated ISRaD Template Information File provides the names and descriptions of all fields.</p>
Abiotic radiocarbon simulated in NEMO ocean model
<p>Following the Ocean Model Intercomparison Project (Orr et al., 1999, 2017), abiotic radiocarbon is simulated using the global ocean circulation model Nucleus for European Modelling of the Ocean (NEMO) version 3.6 (Madec, 2014), which is coupled to the Los Alamos sea-ice model (CICE, Rae et al., 2015). </p> <p>Simulation one, "Hist", was forced with inter-annually varying JRA-55-do atmospheric reanalysis data (version 1.5, Tsujino et al., 2018), which is available for the period 1958 through 2020 at 3-hour intervals, which is cycled over 1850 to 2020; and with historical atmospheric CO2 and ∆14C boundary conditions.</p> <p>The other simulation (”Hist-NYF”) was forced with the JRA-NY atmospheric data in every year, which is a one year chunk (01-May-1990 to 30-April-1991) from JRA-55-do (version 1.3) data when major climate modes such as the North Atlantic Oscillation, Southern Oscillation and Southern Annular Mode were largely neutral. </p> <p>The "Fix" simulation ran with fixed atmospheric CO2 and ∆14 C boundary conditions, using 1850 values and inter-annually varying JRA-55-do atmospheric reanalysis data.</p>
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Allen Brain Atlas
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International Brain Laboratory public data
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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.