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152 results for “lake sediment”
Figure 1 in The microplastic pattern in Turkish lakes: sediment and bivalve samples from Çıldır Lake Almus Dam Lake, and Kartalkaya Dam Lake
Figure 1. Sampling area. Red circles represent the locations of the lakes where sediments and mussels were collected.
Data to reproduce the results presented in Lake et al. 2024. Journal of Hydrology, https://doi.org/10.1016/j.jhydrol.2024.131930. ("High-frequency spatial sediment source fingerprinting using in situ absorbance data")
<p>This repository contains data on the used absorbance data, measured at the field site, as described in Lake et al., 2024 (<span>h</span><span>t</span><span>t</span><span>p</span><span>s</span><span>:</span><span>/</span><span>/</span><span>d</span><span>o</span><span>i</span><span>.</span><span>o</span><span>r</span><span>g</span><span>/</span><span>1</span><span>0</span><span>.</span><span>1</span><span>0</span><span>1</span><span>6</span><span>/</span><span>j</span><span>.</span><span>j</span><span>h</span><span>y</span><span>d</span><span>r</span><span>o</span><span>l</span><span>.</span><span>2</span><span>0</span><span>2</span><span>4</span><span>.</span><span>1</span><span>3</span><span>1</span><span>9</span><span>3</span><span>0).</span> Furthermore, data on the turbidity, used calibration curves and R code to prepare the input data for the MixSIAR model are included in the data repository.</p>
Figure 2 in First record of Parochlus kiefferi (Garrett, 1925) in a sediment sequence from a Slovak mountain lake with notes on paleolimnological interpretation
Figure 2. Detail of the head capsule of Parochlus kiefferi found in lake Vrbické pleso. Photo: Martina Jambrović.
Radiometric dating of sediment cores from three alpine lakes in Utah, United States, with stable isotope data
<p>We collected sediment cores from three alpine lakes in Utah, United States, to isolate dormant <em>Daphnia </em>eggs for a resurrection ecology experiment. Our question was whether radioactive fallout from above-ground nuclear weapons testing at the Nevada Test Site in the 1950s and 1960s caused increased mutation rates and population evolution in <em>Daphnia</em>. That work is ongoing. Here, we publish radioisotope dating profiles from our sediment cores.</p>
Individual ostracode valve analyses (IOVA) of Sclerocypris clavularis from modern Lake Turkana sediments
<p>We provide stable carbon (δ¹³C) and oxygen (δ¹⁸O) isotope measurements in individual calcitic valves of extant ostracode species, Sclerocypris clavularis, from modern sediments in 17 sites across Lake Turkana, eastern Africa. These sediments were collected using a modified Ekman dredge during May-November, 1979. Pooled statistics of these individual ostracode valve analyses (IOVA) of δ¹³C and δ¹⁸O measurements (n = 329) at each site show strong correlations with lake hydrological parameters. Within-site variance in IOVA-δ¹³C is larger (~60%) than that of IOVA-δ¹⁸O. Yet, pooled averages exhibit a systematic pattern with higher δ values towards the southern part of the lake, away from Omo River inflow, which is the largest riverine input into Lake Turkana (comprising ~90% of overall inflows). We suggest that the latitudinal δ¹³C gradient may arise from low riverine δ¹³C and low organic matter δ¹³C as a productivity response to nutrient-rich Omo River inflow towards the north. The δ¹⁸O pattern may be explained by the diminishing influence of Omo River inflows and more evaporation driving higher IOVA-δ¹⁸O values towards the windier, southern basin. We conclude that pooled IOVA statistics in Omo-Turkana sediments can aid interpretations of past regional paleohydrology and its variability in this basin.</p>
Magnetic properties of siliciclastic sediments from the Zăton Lake
<p>Magnetic properties of siliciclastic sediments from the Zăton Lake ((Mehedinţi Plateau, South Carpathians, Romania; 44.972782° N, 22.75433° E, 343 m ).: paleomagnetic directions, magnetic susceptibility measured at two frequencies, anisotropy of magnetic susceptibility.</p>
Radiometric dating of sediment cores from three alpine lakes in Utah, United States, with stable isotope data
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Testing alternative hypotheses for the decline of cichlid fish in Lake Victoria using fish fossils time series from sediment cores
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Permafrost-thaw lake development in Central Yakutia: sedimentary ancient DNA and element analyses from a Holocene sediment record
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McMurdo Dry Valleys Iodine content and I-129 isotopic composition in McMurdo lake-bottom sediments
As part of a collaborative investigation between researchers at Rice University, Arkansas State University, University of Rochester, and Ohio State University, lakes of the McMurdo Dry Valleys were sampled at discreet depth intervals during the 2005-2006 field season.  Sample splits were subsequently analyzed for chemical and isotopic composition of both gases and dissolved  ions, as well as dissolved organic carbon. In addition, cryogenic salts were sampled in the surrounding lake shores in order to determine the salt sources. Gravity cores were also obtained and the pore waters were collected by centrifuging the wet sediment.  Presented  in this file is the total iodine content and I-129 isotopic composition of lake-bottom sediments from Lakes Joyce and Fryxell. An attempt was made to determine the  iodine and chlorine isotopic content  of gypsum cored from the bottom of Lake Vanda, but the total iodine content was below detection.       Â
Macrofossils in sediments from Genggahai Lake on the Tibetan Plateau
<p>The data include the remains of Macrofossils from the genghai sedimentary core since nearly 16 Ka. Based on the selection and identification of submerged plants, Cladocera and diatom fossils in the sediments, the changes of the main aquatic communities in the lake were analyzed. </p>
U-Th dating of lake sediments: Lessons from the 700 ka sediment record of Lake Junín, Peru — Datasets
<p><strong>Title</strong>: U-Th dating of lake sediments: Lessons from the 700 ka sediment record of Lake Junín, Peru — Datasets</p> <p><strong>Version</strong>: 2.0</p> <p><strong>Date of Release</strong>: August 18, 2020</p> <p><strong>Last Update</strong>: September 16, 2020</p> <p><strong>Identifier</strong>: 10.5281/zenodo.4031644</p> <p><strong>Permalink</strong>: <a href="https://doi.org/10.5281/zenodo.4031644">https://doi.org/10.5281/zenodo.4031644</a></p> <p><strong>Associated publication</strong>: Chen, C.Y., McGee, D., Woods, A., Pérez, L., Hatfield, R.G., Edwards, R.L., Cheng, H., Valero-Garcés, B.L., Lehmann, S.B., Stoner, J.S., Schwalb, A., Tal, I., Seltzer, G.O., Tapia, P.M., Abbott, M.B., and Rodbell, R.T. (2020) U-Th dating of lake sediments: Lessons from the 700 ka sediment record of Lake Junín, Peru. Quaternary Science Reviews. 244: 106422 doi: <a href="https://doi.org/10.1016/j.quascirev.2020.106422">10.1016/j.quascirev.2020.106422</a></p> <p><strong>Link to publication</strong>: <a href="http://doi.org/10.1016/j.quascirev.2020.106422">https://doi.org/10.1016/j.quascirev.2020.106422</a></p> <p><strong>Suggested citation</strong>: Please reference the associated publication above when using any datasets or materials in this repository.</p> <p><strong>Contact information</strong>: Christine Y. Chen, cychen@caltech.edu OR cychen.earth@gmail.com</p> <p><strong>Dates of data collection and generation</strong>: February 2016 to July 2019</p> <p>---------------</p> <p><strong>VERSION NOTES </strong>(v2.0)</p> <p>This online data repository was updated in order to correct errors in the U-Th data tables (Tables A1, A2, and A3) and subsequently update the age-depth model. The corrections impacted the files named '<em>CYChen et al. (2020) QSR - U-Th Data Tables for PLJ-1 and 1996 cores - v2.xlsx</em>' and '<em>CYChen et al. (2020) QSR - Input Your Own Depths for Age-Depth Model - v2.xlsx</em>'. No changes have been made to the original versions of other datasets. However, all components of this data repository have been given the "v2" identifier to be consistent with the versioning scheme applied to this data repository as a whole by Zenodo.</p> <p>---------------</p> <p><strong>DESCRIPTION OF DATA</strong></p> <p>This data repository contains the following datasets and supplementary materials. Specific documentation and, where applicable, instructions of use are included in the readme section of each file. We refer the user to the original manuscript (see above) and the text of the Supplemental Materials published alongside this manuscript for additional general information regarding the collection and generation of these data.</p> <p>SUPPLEMENTARY TEXT AND FIGURES</p> <ul> <li><strong>CYChen et al. (2020) QSR - Supplementary Materials.pdf</strong></li> </ul> <p>DATA TABLES FOR PLJ-1 and 1996 CORE</p> <ul> <li><strong>CYChen et al. (2020) QSR - U-Th Data Tables for PLJ-1 and 1996 cores - v2.xlsx</strong>: U-Th data tables for the PLJ-1 and 1996 core (with all digits preserved where possible, for reproducibility and data longevity)</li> <li><strong>CYChen et al. (2020) QSR - Other Data for PLJ-1 core - v2.xlsx</strong>: sample locations and corresponding elemental concentrations, carbon coulometry, and color reflectance data</li> <li><strong>CYChen et al. (2020) QSR - Ostracode Analysis for PLJ-1 core - v2.xlsx</strong>: ostracode paleoecological data from the PLJ-1 core</li> </ul> <p>MODELING URANIUM-THORIUM ISOTOPIC EVOLUTION OF LAKE SEDIMENTS</p> <ul> <li><strong>CYChen et al. (2020) QSR - Modeling Spreadsheet for Uranium-Thorium Isotopic Evolution of Lake Sediments - v2.xlsx</strong>: spreadsheet for simulating the uranium-thorium isotopic evolution of a sample that has undergone open system behavior with respect to uranium and/or a sample of mixed composition (an impure carbonate)</li> </ul> <p>AGE-DEPTH MODEL</p> <ul> <li><strong>CYChen et al. (2020) QSR - Input Your Own Depths for Age-Depth Model - v2.xlsx</strong>: spreadsheet for extracting the radiometric-based age-depth model generated by Bacon by splice depth</li> </ul>
Denitrification rates in lake sediments of mountains affected by high atmospheric nitrogen deposition
<p>During the last decades, atmospheric nitrogen loading in mountain ranges of the Northern Hemisphere has increased substantially, resulting in high nitrate concentrations in many lakes. Yet, how increased nitrogen has affected denitrification, a key process for nitrogen removal, is poorly understood. We measured actual and potential (nitrate and carbon amended) denitrification rates in sediments of several lake types and habitats in the Pyrenees during the ice-free season. Actual denitrification rates ranged from 0 to 9 μmol N<sub>2</sub>O m<sup>−2</sup> h<sup>−1</sup> (mean, 1.5 ± 1.6 SD), whereas potential rates were about 10-times higher. The highest actual rates occurred in warmer sediments with more nitrate available in the overlying water. Consequently, littoral habitats showed, on average, 3-fold higher rates than the deep zone. The highest denitrification potentials were found in more productive lakes located at relatively low altitude and small catchments, with warmer sediments, high relative abundance of denitrification nitrite reductase genes, and sulphate-rich waters. We conclude that increased nitrogen deposition has resulted in elevated denitrification rates, but not sufficiently to compensate for the atmospheric nitrogen loading in most of the highly oligotrophic lakes. However, there is potential for high rates, especially in the more productive lakes and landscape features largely govern this.</p>
Individual glass and secondary standard analyses for tephra described in sediment cores from Skilak Lake, Alaska
<p>This dataset comprises individual glass shard and secondary standard analyses for tephra collected in sediment cores from Skilak Lake, Alaska. These geochemical analyses were used in the research article in Sedimentology titled “Unravelling a 2300 year long sedimentary record of megathrust and intraslab earthquakes in proglacial Skilak Lake, south-central Alaska” by Praet et al. (2022). DOI: <a href="https://doi.org/10.1111/sed.12986">10.1111/sed.12986</a></p>
Geochemical and isotopic analyses of a ~14 000 year old sediment core collected from Lake Simcoe, Canada
<p>This dataset contains measurements of modern water and ancient core materials from Lake Simcoe, the fourth largest lake wholly in Ontario, Canada. These data consist of: <em>(i)</em> oxygen, hydrogen and carbon isotope (<em>δ</em><sup>18</sup>O, <em>δ</em><sup>2</sup>H and <em>δ</em><sup>13</sup>C) compositions for modern water samples; <em>(ii)</em> physical measurements of one piston core, PC-5; <em>(iii) δ</em><sup>13</sup>C and <em>δ</em><sup>18</sup>O values of ostracods collected from PC-5, and <em>(iv) δ</em><sup>13</sup>C and <em>δ</em><sup>18</sup>O values of ancient DIC and water, respectively, inferred from item <em>(iii)</em>. Physical measurements performed on core PC-5 include magnetic susceptibility, mineralogy and grain size. Mass accumulation rates are also reported.</p>
Sediment datasets of Lake Taihu
<p>Dediment datasets, including bed sediments, turbidity, meteorological data 2018 and 2020, sediment setting experiments, model data, suspended sediment concentration.</p>
Data to reproduce the results presented in Lake et al. 2022. Hydrological processes, https://doi.org/10.1002/hyp.14726 ("Using particle size distributions to fingerprint suspended sediment sources – evaluation at laboratory and catchment scales")
<p>This repository contains data on particle size distribution data obtained from the laboratory and field experiments as described in Lake et al., 2022. </p> <p>The data contains the input files as needed for the modelling:</p> <p>- In the excel files the particle size distribution data for the target SS</p> <p>- In the text file the particle size distribution data from the sources.</p> <p> </p> <p>Furthermore, the data contains the resulting output files.</p> <p> </p>
Beryllium Isotopes in Maar Lake Sediments Response to Rapid Climate Change Since the Last Deglaciation
<p>Data for "<span>Beryllium Isotopes in Maar Lake Sediments Response to Rapid Climate Change Since the Last Deglaciation</span>"</p>
Figure 1 in First record of Parochlus kiefferi (Garrett, 1925) in a sediment sequence from a Slovak mountain lake with notes on paleolimnological interpretation
Figure 1. View of lake Vrbické pleso. Photo: Ladislav Hamerlík.
Dataset for 'Effects of bubble plumes on lake dynamics, near-bottom turbulence, and transfer of dissolved oxygen at the sediment-water interface'
<p>The dataset associated with the article "Effects of bubble plumes on lake dynamics, near-bottom turbulence, and transfer of dissolved oxygen at the sediment-water interface". </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.