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2 results for “Common Era”
Twenty-two thousand Common Era benthic foraminifera from the Santa Barbara Basin
<p>Here we provide an image and 2D shape dataset of recent benthic foraminifera from two core records sampled from the center of the Santa Barbara Basin that span an ~800-year-long interval during the Common Era (1249-2008 CE). Information on more than 36,000 objects is included, of which more than 22,000 are complete or partially damaged benthic foraminifera. Skeletonized objects classified also include planktonic foraminifera, ostracods, pteropods, diatoms, radiolarians, fish teeth and skeletal structures, shark dermal denticles, and benthic foraminifer test fragments. The image dataset was produced using a high-throughput imaging method (<em>AutoMorph</em>) designed to extract 2D data from photographic images of fossils. This repository contains 8 distinct data types uploaded as distinct files, and includes the following:</p> <ol> <li><strong><em>bulk_images.zip</em>: </strong>Bulk images with objects identified by <em>segment</em> boxed in red</li> <li><strong><em>individual_images.zip</em>:</strong> EDF images of individual objects within the dataset</li> <li><strong><em>identification_files.zip</em>:</strong> Classifications for individual objects, including both general categories and species-specific classifications (when possible) for benthic foraminifera</li> <li><strong><em>cleaning_scripts.zip</em>:</strong> Directory containing R scripts used to clean object category misspellings or inconsistencies</li> <li><strong><em>outline_images.zip</em>:</strong> EDF images of objects successfully extracted for 2D outlines and measurements; included for quality control. This includes one text file (unextracted_objects_2D.txt) listing objects with failed extractions</li> <li><strong><em>2d_coordinates.zip</em>:</strong> CSV files containing all extracted outline coordinates for each of the samples imaged, a text file of failed 2D extractions (unextracted_objects_2D.txt), and a summary CSV file including coordinates for all extracted objects (all_coordinates.csv)</li> <li><strong><em>2d_properties.zip</em>:</strong> 2D measurements for all objects</li> <li><strong><em>metadata_tables.zip</em>: </strong>Tables 1, 2, and 3 and Supplementary Table 1 from a forthcoming data descriptor publication, describing sample metadata, including site coordinates, sample names, object information, and summary statistics</li> </ol> <p>The dataset we provide here comprises the most extensive publicly available archive of benthic foraminiferal morphology and 2D morphological variation to date.</p>
A global collection of paleoclimate proxy time series over the Common Era
<p><strong>*Dec 2023 Proxy Database Update: This database has been updated based on a more stringent proxy screening procedure. All screening calculations and decisions are documented in the accompanying Julia code Pluto notebook file (see also the HTML file preview of the code). This screening has resulted in the removal of 183 proxy time series from the original file.*</strong></p><p><i><strong>Original Data Descriptor:</strong></i></p><p>This collection of paleoclimate proxy data currently includes 2591 tree ring chronologies, 197 coral and sclerosponge records, 153 ice core isotope records, 26 speleothem isotope records, 10 lake sediment records, and 1 marine sediment record, for a total of 2,978 records. The proxy records have been collected with a focus on the past 2000 years.</p><p>This dataset has been collated through collaborative efforts with the Last Millennium Reanalysis project (Hakim et al. 2016) and provides the basis for the reconstructions presented in Steiger et al. (2018). Though the majority of data records are culled from PAGES2k Consortium (2017) and Breitenmoser et al. (2014), some data was taken from the NOAA NCEI's World Data Center for Paleoclimatology archive. Additionally, data was solicited from multiple investigators such as Eric Steig, Stephanie Hayman, Sylke Draschba, Henning Kuhnert, Andy Baker, and others amounting to approximately 60 coral, ice core, speleothem, and lake sediment datasets, though all files in this archive can be freely shared. Datasets were selected whose resolution was at least 25 years, temporal duration was greater than 40 years, and consisted of proxies that had established proxy system models (forward models). </p><p>The data files are in Matlab format and the variables here include the proxy names ('lmr2k_names'), the proxy data ('lmr2k_data'), the proxy type ('archive'), the proxy measurement ('msrmt'), the proxy latitudes and longitudes ('p_lat' and 'p_lon'), and the years of the proxies ('year'). Seasonally resolved proxies have been averaged from April to the following calendar year March.</p><p>Updates will be made to this proxy collection as more proxy data become available.</p><p> </p><p>Breitenmoser, P., et al. "Forward modelling of tree-ring width and comparison with a global network of tree-ring chronologies." <i>Climate of the Past</i> 10.2 (2014): 437.</p><p>PAGES2k Consortium. "A global multiproxy database for temperature reconstructions of the common era." <i>Scientific Data</i> 4, 170088 (2017).</p><p>Hakim, Gregory J., et al. "The last millennium climate reanalysis project: Framework and first results." <i>Journal of Geophysical Research: Atmospheres</i> 121.12 (2016): 6745-6764.</p><p>Steiger, N. J. et al. "A reconstruction of global hydroclimate and dynamical variables over the Common Era." <i>Scientific Data </i>5:180086 (2018).</p>
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