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65 results for “North Greenland”
Multi-Sensor Ice Analysis Data: Analysis for Belgica Bank, North East Greenland 2019-20
<p>The intention is that this dataset can be used for machine learning and deep neural network training/validation, and it distinguishes sea ice concentration, type and form derived from manual analysis of a combination of different satellite sensors including ALOS-2, Sentinel-1, COSMO-SkyMed, Sentinel-2, and ICESAT-2. The region chosen for the analysis was the Belgica Bank area offshore of North East Greenland, as this is an area which experiences a wide variety of sea ice, and iceberg, conditions throughout the year. The dataset consists of two parts: 11 days of individual sea ice interpretations, one for each month in the period from April 2019 to March 2020, with the exception of October 2019, and iceberg surveys derived from Sentinel-2 for spring in 2019 and 2020. </p> <p>The dataset includes a user guide issued by MET Norway as report 10/2022 (see https://www.met.no/publikasjoner/met-report) in which the first part describes the data sources, nomenclature, file formats and data in the analysis. A second part of the report compares synthetic aperture radar (SAR) data from both L-band ALOS-2 and C-band Sentinel-1 satellites, and identifies the visible synergies and anomalies. The results confirm that there are variations in backscatter signatures between ALOS-2 and Sentinel-1 data when comparing them for different sea ice situations and conditions. ALOS-2 data in many cases is proven to be a reliable and beneficial source of data when it comes to identifying icebergs, ridges, determining sea ice type, and also distinguishing ice and water compared to standalone Sentinel-1 data.</p>
Ground temperature timeseries (2014-2021) and cryostratigraphy from Villum Research Station, Station Nord, eastern North Greenland (81° N)
<p>This dataset contains ground temperature timeseries (2014-2021) and cryostratigraphy data from two 20 m deep boreholes located at Villum Research Station (VRS), Station Nord, eastern North Greenland. The cryostratigraphy data includes split permafrost core photographs and values for the following parameters: gravimetric moisture content, salinity, and freezing point depression. A complete sample inventory and information on sample quality and recovery is also included. Please read the file "Readme_Strandetal2021_V2" for the necessary background information and overview of the dataset contents (file structure and description of each file). This is the second version of the dataset; the ground temperature timeseries in this version are 2.5 years longer than in the first version, and meteorology data from the same period as the ground temperature data is provided.</p>
MPAS-Albany Land Ice model simulations of Humboldt Glacier, North Greenland, from 2007–2100
<p>This dataset contains model input and output in netCDF format, model code, and analysis scripts for simulations of Humboldt Glacier, North Greenland, through the 21st century (Hillebrand et al., 2022) using the MPAS-Albany Land Ice model (Hoffman et al., 2018). We calibrate parameters controlling basal traction, iceberg calving, and submarine melt against observations from 2007–2017. We then explore the glacier’s sensitivity to climate forcing, iceberg calving, and basal conditions in an ensemble of 24 simulations from 2007–2100. We further explore its sensitivity to uncertainties in ice-shelf melt, bed topography, and calving rate limits in targeted sensitivity experiments. Input files include surface mass balance, ocean thermal forcing, and subglacial runoff forcings provided by ISMIP6 (Nowicki et al., 2020; Slater et al., 2020). Output includes basal traction optimization solutions for the year 2007; annual 2D ice speed, basal shear and driving stresses, and geometry; annual 3D temperature; and grounded, floating, and global mass budgets at every timestep.</p> <p>References:</p> <p>Hillebrand, T. R., Hoffman, M. J., Perego, M., Price, S. F., and Howat, I. M. (2022): The contribution of Humboldt Glacier, northern Greenland, to sea-level rise through 2100 constrained by recent observations of speedup and retreat, The Cryosphere, 16, 4679–4700, <a href="https://doi.org/10.5194/tc-16-4679-2022">https://doi.org/10.5194/tc-16-4679-2022</a>.</p> <p>Hoffman, M. J., Perego, M., Price, S. F., Lipscomb, W. H., Zhang, T., Jacobsen, D., et al. (2018). MPAS-Albany Land Ice (MALI): a variable-resolution ice sheet model for Earth system modeling using Voronoi grids. <em>Geoscientific Model Development</em>, <em>11</em>(9), 3747–3780.<a href="https://doi.org/10.5194/gmd-11-3747-2018"> https://doi.org/10.5194/gmd-11-3747-2018</a></p> <p>Nowicki, S., Goelzer, H., Seroussi, H., Payne, A. J., Lipscomb, W. H., Abe-Ouchi, A., et al. (2020). Experimental protocol for sea level projections from ISMIP6 stand-alone ice sheet models. <em>The Cryosphere</em>, <em>14</em>(7), 2331–2368.<a href="https://doi.org/10.5194/tc-14-2331-2020"> https://doi.org/10.5194/tc-14-2331-2020</a></p> <p>Slater, D. A., Felikson, D., Straneo, F., Goelzer, H., Little, C. M., Morlighem, M., et al. (2020). Twenty-first century ocean forcing of the Greenland ice sheet for modelling of sea level contribution. <em>The Cryosphere</em>, <em>14</em>(3), 985–1008.<a href="https://doi.org/10.5194/tc-14-985-2020"> https://doi.org/10.5194/tc-14-985-2020</a></p>
Evolution of ocean circulation in the North Atlantic Ocean during the Miocene: impact of the Greenland Ice Sheet and the Eastern Tethys Seaway
<p>This dataset contains atmosphere and ocean outputs (NetCDF files) from modeling experiments with realistic early Miocene paleogeography as well as sensitivity to Greenland Ice Sheet and Eastern Tethys Seaway. The set of simulation targets the evolution of the North Atlantic Deep Water during the Miocene. The simulations have been run using the IPSL-CM5A2 General Circulation Model (Sepulchre et al. 2020 - IPSL-CM5A2 – an Earth system model designed for multi-millennial climate simulations, GMD). It includes 3 ocean-atmosphere simulations. Data are monthly averages over the last 100 years of the simulations. </p>
Fig. 6 in Trachyplax arctica, a new multiplated problematic fossil from the lower Cambrian of North Greenland
Fig. 6. Schematic illustration showing preferred interpretation of sclerite type transitions in Trachyplax arctica gen. et sp. nov., with double lines symbolising fusion of two sclerites resulting in sclerite type G, dashed grey−shaded lines symbolising alternative transitions. Not to scale.
Fig. 7 in Trachyplax arctica, a new multiplated problematic fossil from the lower Cambrian of North Greenland
Fig. 7. Reconstructions of Trachyplax arctica gen. et sp. nov., not to scale. A. Alternative 1, with cataphract arrangement of sclerite type A, based on numerical proportions of sclerite types. B, C. Alternative 2 with type A sclerites placed along the lateral margins of a bilaterally symmetrical, elongate organism (B) and an equidimensional, radially symmetrical organism (C). Randomly chosen number of sclerites.
Fig. 4 in Trachyplax arctica, a new multiplated problematic fossil from the lower Cambrian of North Greenland
Fig. 4. Multiplated problematic fossil Trachyplax arctica gen. et sp. nov., sclerite types B–E, all external views. A, B. Sclerite type B, right and left morphs. A. MGUH 29091, in dorsal view (A1), lateral view showing arching edge (A2), and lateral view (A3). B. MGUH 29092, in dorsal view. C, D. Sclerite type C, right and left morphs. C. MGUH 29093, in dorsal view. D. MGUH 29094, in dorsal view (D1) and lateral view showing arching edge (D2). E, F. Sclerite type D, right and left morphs. E. MGUH 29095, in dorsal view (E1), lateral view, profile (E2), lateral view showing arching edge (E3), and lateral view showing straight side (E4). F. MGUH 29096, in dorsal view. G. MGUH 29097, sclerite type E in external view (G1), lateral view showing straight side (G2), and lateral view, profile (G3).
Fig. 2. Schematic drawing showing measured parameters and descriptive terminology used for sclerite types A–H in Trachyplax arctica, a new multiplated problematic fossil from the lower Cambrian of North Greenland
Fig. 2. Schematic drawing showing measured parameters and descriptive terminology used for sclerite types A–H. Abbreviations: A, apical angle; Ai, apex interarea; L, length; Lr, length of rostrum; Ls, length of shield; H, height; W, width; Wai, width of apex interarea; Wr, width of rostrum; Ws, width of shield. Not to scale.
Fig. 5 in Trachyplax arctica, a new multiplated problematic fossil from the lower Cambrian of North Greenland
Fig. 5. Multiplated problematic fossil Trachyplax arctica gen. et sp. nov., sclerite types F–H, all external views. A, B. Sclerite type F. A. MGUH 29098, in dorsal view showing fold (A1) and lateral view (A2). B. MGUH 29099, in dorsal view showing twisted ridges. C, D. Sclerite type G, right and left morphs. C. MGUH 29100, in dorsal view. D. MGUH 29101, in dorsal view showing apices and apex interarea (D1) and lateral view showing apices and apex interarea (D2). E. MGUH 29102, sclerite type H in lateral view showing radial ridges (E1, E2) and external view (E3).
Fig. 1 in Trachyplax arctica, a new multiplated problematic fossil from the lower Cambrian of North Greenland
Fig. 1. Derivation of Trachyplax arctica gen. et sp. nov. A. Locality in North Greenland. B. Stratigraphy: Brønlund Fjord Group, Paralleldal Formation, indicating horizon of collection (filled circle).
Fig. 6 in The earliest annelids: Lower Cambrian polychaetes from the Sirius Passet Lagerstätte, Peary Land, North Greenland
Fig. 6. Polychaete annelid Phragmochaeta canicularis gen. et sp. nov., Lower Cambrian (Atdabanian), Buen Formation, Sirius Passet Lagerstätte, Peary Land, North Greenland. A. MGUH 28.894. B. MGUH 28.895. C. MGUH 28.896. D. MGUH 28.897. E. MGUH 28.898. F. MGUH 28.899. All specimens coated with ammonium chloride sublimate. Scale bars 3 mm. Abbreviations: AC, anterior chaetae (probably the notochaetae); Gut, gut (alimentary canal); Gut Co, gut contents; MU, muscles flanking the gut; NeC, neurochaetae; NoC, notochaetae; Pa, parapodia; Ve?, presumed ventral surface.
Fig. 5 in The earliest annelids: Lower Cambrian polychaetes from the Sirius Passet Lagerstätte, Peary Land, North Greenland
Fig. 5. Polychaete annelid Phragmochaeta canicularis gen. et sp. nov., Lower Cambrian (Atdabanian), Buen Formation, Sirius Passet Lagerstätte, Peary Land, North Greenland. A. MGUH 28.889. B. MGUH 28.890. C. MGUH 28.891. D. MGUH 28.885. E. MGUH 28.892. F. MGUH 28.893. All specimens coated with ammonium chloride sublimate. Scale bars 3 mm. Abbreviations: Gut, gut (alimentary canal); MU, muscles flanking the gut; MU?, presumed muscles flanking the gut; NeC, neurochaetae; NoC, notochaetae; Pa, parapodia.
Fig. 2 in The earliest annelids: Lower Cambrian polychaetes from the Sirius Passet Lagerstätte, Peary Land, North Greenland
Fig. 2. Polychaete annelid Phragmochaeta canicularis gen. et sp. nov., Lower Cambrian (Atdabanian), Buen Formation, Sirius Passet Lagerstätte, Peary Land, North Greenland. A. MGUH 28.880, dorsal view (A1) with anterior enlarged (A2). B. MGUH 28.881. C. MGUH 28.882. D. MGUH 28.883. All specimens coated with ammonium chloride sublimate. Scale bars 2 mm. Abbreviations: AC, anterior chaetae (probably the notochaetae); NeC, neurochaetae; NoC, notochaetae; MU, muscles flanking the gut; SR, segmental rods.
Fig. 1 in The earliest annelids: Lower Cambrian polychaetes from the Sirius Passet Lagerstätte, Peary Land, North Greenland
Fig. 1. Locality map of North Greenland (A, B), with position of the Sirius Passet Lagerstätte (C) and its simplified geological context.
Fig. 13 in Hyoliths and small shelly fossils from the Lower Cambrian of North-East Greenland
Fig. 13. Coleolus sp. A. MGUH 27119, from GGU sample 314933, lateral view. B. MGUH 27120, from GGU sample 314835; B1–B3, lateral views; B4, cross−section. C. MGUH 3527 from the collections of C. Poulsen, lateral view. Scale bars 1 mm.
Fig. 10. A–C in Hyoliths and small shelly fossils from the Lower Cambrian of North-East Greenland
Fig. 10. A–C. "Orthotheca bayonet var. groenlandica (Poulsen, 1932)". A. MGUH 3521; A1, venter; A2, right lateral edge; A3, dorsum. B. MGUH 3523, venter. C. MGUH 3525; C1, dorsum; C2, venter; C3, cross−section. D. "Orthotheca communis (Billings, 1872)", MGUH 3524; D1, cross−section; D2, dorsum; D3, right lateral edge with venter to right; D4, venter. E. "Orthotheca bayonet var. longa (Poulsen, 1932)", MGUH 3526, venter. F. "Orthotheca billingsi (Walcott, 1886)", MGUH 3528, venter. G. Coleolus sp.? MGUH 3517. All specimens from the collections of C. Poulsen. Scale bars 2 mm.
Fig. 4. A, B. Parkula bounites Bengtson, 1990a. A. MGUH 27092 in Hyoliths and small shelly fossils from the Lower Cambrian of North-East Greenland
Fig. 4. A, B. Parkula bounites Bengtson, 1990a. A. MGUH 27092; A1, exterior of operculum from above; A2, lateral view of operculum with conical shield to right. B. MGUH 27093, interior of operculum with cardinal processes and clavicles (top of the picture). C, D. Parkula? sp. C. MGUH ZZZ13; C1, exterior of operculum from above; C2, view from cardinal shield showing enlarged cardinal processes. D. MGUH 27095; D1, exterior of operculum from above; D2, lateral view of operculum with conical shield to right; D3, view from cardinal shield showing enlarged cardinal processes. E–I. Hyptiotheca karraculum Bengtson, 1990a. E. MGUH 27096; E1, exterior of operculum from above; E2, lateral view with conical shield to right, showing no change in angle between conical and cardinal shields; E3, view from edge of conical shield. F. MGUH 27097; F1, oblique view from above of exterior of operculum from above; F2, view from edge of conical shield; F3, exterior of operculum from above. G. MGUH 27098; G1, oblique view from above of exterior of operculum from above; G2, lateral view of operculum with conical shield to right, showing abrupt change in angle between cardinal and conical shields. H. MGUH 27099; H1, lateral view of operculum with conical shield to right, showing abrupt change in angle between cardinal and conical shield; H2, exterior of operculum from above. I. MGUH 27100, interior view showing weakly developed depressions along edges only, corresponding to rooflets on exterior. All from GGU sample 314835. Scale bars 0.2 mm.
Fig. 9. A in Hyoliths and small shelly fossils from the Lower Cambrian of North-East Greenland
Fig. 9. A. Gracilitheca sp. MGUH 27108. From GGU sample 314908; A1, cross−section viewed from apical region with dorsum above; A2, venter; A3, dorsum. B, C. Orthothecid? sp. B. MGUH 27109; B1, oblique view of dorsum; B2, venter; B3, cross−section. C. MGUH 27110; C1, cross−section; C2, oblique view of dorsum; C3, venter. D. Contitheca? sp. MGUH 27111; D1, oblique view with venter to right. D2, cross−section viewed from apical region with dorsum on top. All except A from GGU sample 314809. Scale bars 0.2 mm.
Data from: Late Ordovician and Early Silurian virgianid and stricklandioid brachiopods from North Greenland: Implications for a warm-water faunal province
<p>An unusually rich and diverse suite of virgianid brachiopods, hitherto poorly known, are systematically described here for the first time from the Ordovician–Silurian boundary interval (late Katian–Aeronian) of North Greenland. The Late Ordovician virgianids comprise typical taxa of the warm-water <em>Tcherskidium</em> fauna (e.g. <em>Tcherskidium tenuicostatum</em>, <em>Proconchidium schleyi</em>, <em>Holorhynchus giganteus</em>, and <em>Deloprosopus dawesi</em> sp. nov.). Among the early Silurian taxa, <em>Virgiana hursti </em>sp. nov. occurs as abundant shell beds, similar to other congeneric species in Laurentia, but has somewhat larger internal skeletal structures, albeit not as extravagantly developed as in the late Katian virgianids; <em>Boraeloides balderi</em> gen. et sp. nov. shows extreme thickening of shell wall and internal structures, approaching the extravagant calcification of Katian virgianids. The highly distinct mid-Aeronian stricklandioid brachiopod genus, <em>Kulumbella</em>, characterized by a shell with criss-cross (divaricate) ribbing, also occurs in North Greenland, represented by <em>K. heimdalli</em> sp. nov., which has the largest and most strongly biconvex shells for the genus. Palaeogeographically, the Late Ordovician virgianid fauna of Laurentia was highly distinct, confined to the low–mid tropical latitudes north of the palaeoequator. In comparison, the early Silurian (Rhuddanian) <em>Virgiana</em> and some related taxa in Laurentia spanned the tropics of both hemispheres, forming extensive shell beds in carbonate basins, although <em>Borealis</em> and <em>Borealoides </em>gen. nov. remained confined largely to the northern hemisphere, suggesting a certain level of provincialism extending into the earliest Silurian. The unusual abundance and richness of the virgianid faunas in North Greenland is likely explained by a palaeoecological preference for warm-water carbonate settings.</p>
Data from: Morphometric analysis of Skiagia-plexus acritarchs from the early Cambrian of North Greenland
<p>The Cambrian evolutionary radiations are marked by spectacular biotic turnovers and the establishment of increasingly tiered food chains. At their base are primary producers, which in the Cambrian fossil record are chiefly represented among organic-walled microfossils. The majority of these microfossil remains have traditionally been attributed to an informal category of <em>incertae sedis</em> called "acritarchs", based entirely on form taxonomy. Acritarch form-taxa have been intensely used for biostratigraphy, and in large-scale studies of phytoplankton diversity. However, both prospects have been challenged by cases of taxonomic inconsistencies and over-splitting arising from the large phenotypic plasticity seen among these microfossils. The acritarch form-genus <em>Skiagia</em> stands as an ideal case-study to explore these taxonomic challenges, since it encompasses a number of form-species widely used in lower Cambrian biostratigraphy. Moreover, subtle morphological differences among <em>Skiagia</em> species were suggested to underlie key evolutionary innovations towards complex reproduction strategies. Here we apply a multivariate morphometric approach to investigate the morphological variation of <em>Skiagia</em>-plexus acritarchs using an assemblage sourced from the Buen Formation (Cambrian Series 2, Stage 3–4) of North Greenland. Our analysis showed that the specific-level classification of <em>Skiagia</em> discretizes a continuous spectrum of morphologies. While these findings bring important taxonomic and biostratigraphic hurdles to light, the unequal frequency distribution of life cycle stages among <em>Skiagia</em> species suggests that certain elements of phytoplankton paleobiology are nonetheless captured by <em>Skiagia</em> form-taxonomy. These results demonstrate the value of using morphometric tools to explore acritarch phenotypic plasticity and its potential ontogenetic and paleoecological drivers in Cambrian ecosystems.</p>
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These curated guides explain access requirements, typical timelines, costs, and reuse considerations for widely used research datasets.
Allen Brain Atlas
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DANDI Archive for NWB datasets
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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.