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65 results for “North Greenland”
FESOM model data used in a study on simulated signatures of Greenland melting in the North Atlantic
<p>FESOM (v1.4) model data used in the paper 'Simulated signatures of Greenland melting in the North Atlantic: a model comparison with Argo floats, satellite observations, and ocean reanalysis’ (submitted to JGR Oceans for review) by Stolzenberger et al.</p> <p>The data set consists of monthly simulated potential temperature, salinity and sea surface elevation fields for high and low resolution, including (GF) and excluding (NGF) Greenland freshwater forcing, for the North Atlantic (NA, 50°N-86°N), and for the time period 1993-2016.</p> <p>Furthermore, steric height changes from the inversion output is available as time series for the time period 2002-2016.</p>
Accelerating ice loss from peripheral glaciers in North Greenland
<p class="MsoNormal"><span>In recent decades, Greenland's peripheral glaciers have experienced large-scale mass loss</span><span>, resulting in a substantia</span><span>l contribution to sea-level rise. Only 4% of Greenland's ice cover are small peripheral glaciers that are distinct from the ice sheet proper. Despite comprising this relatively small area, these small peripheral glaciers are responsible for 11% of the ice loss associated with Greenland's recent sea-level rise contribution. Using the satellite laser platforms ICESat and ICESat-2, we estimate that ice loss from these Greenland glaciers increased from 27±6 Gt/yr (2003–2009) to 42±6 Gt/yr (2018–2021).</span></p> <p class="MsoNormal"><span>Here, we provide the laser altimetry assessment of </span><span>changing</span> <span>ice loss rates from Greenland peripheral glaciers that bridges both the ICESat and ICESat-2 periods of Feb 2003 – Dec 2021. We provide peripheral glaciers elevation changes including correction for firn compaction, elastic uplift rates from present-day mass changes, and long-term past ice changes (Glacial Isostatic Adjustment- GIA).</span></p> <p class="MsoNormal"><span>We provide:</span></p> <p class="MsoNormal"><span>(1) Mean elevation change rates of the Greenland peripheral glaciers during, Feb 2003 - Oct 2009, Oct 2008 - Apr 2019, and Oct 2018 – Dec 2021 obtained from ICESat and ICESat-2 data. The grid resolution is 500x500 meters.</span></p> <p class="MsoNormal"><span>(2) Mean elastic uplift rates of the bedrock (in mm/yr) due to ice loss during, Feb 2003 - Oct 2009, Oct 2008 - Apr 2019, and Oct 2018 – Dec 2021.</span></p> <p class="MsoNormal"><span>(3) Mean firn compaction rates in m/yr during, Feb 2003 - Oct 2009, Oct 2008 - Apr 2019, and Oct 2018 – Dec 2021.</span></p> <p class="MsoNormal"><span>(4) Glacial Isostatic Adjustment- GIA rates in mm/yr from the GNET-GIA empirical model of Khan et al. (2016).</span></p> <p class="MsoNormal"><span>(5) Time series of mean surface air temperature in degrees Celcius during May-September in north, northwest, southeast, southwest, and northwest Greenland from RACMO2.3p2.</span></p> <p class="MsoNormal"><span> </span></p> <p class="MsoNormal"><span> </span></p>
Data from: Lake sediment multi-taxon DNA from North Greenland records early post-glacial appearance of vascular plants and accurately tracks environmental changes
High Arctic environments are particularly sensitive to climate changes, but retrieval of paleoecological data is challenging due to low productivity and biomass. At the same time, Arctic soils and sediments have proven exceptional for long-term DNA preservation due to their constantly low temperatures. Lake sediments contain DNA paleorecords of the surrounding ecosystems and can be used to retrieve a variety of organismal groups from a single sample. In this study, we analyzed vascular plant, bryophyte, algal (in particular diatom) and copepod DNA retrieved from a sediment core spanning the Holocene, taken from Bliss Lake on the northernmost coast of Greenland. A previous multi-proxy study including microscopic diatom analyses showed that this lake experienced changes between marine and lacustrine conditions. We inferred the same environmental changes from algal DNA preserved in the sediment core. Our DNA record was stratigraphically coherent, with no indication of leaching between layers, and our cross-taxon comparisons were in accordance with previously inferred local ecosystem changes. Authentic ancient plant DNA was retrieved from nearly all layers, both from the marine and the limnic phases, and distinct temporal changes in plant presence were recovered. The plant DNA was mostly in agreement with expected vegetation history, but very early occurrences of vascular plants, including the woody Empetrum nigrum, document terrestrial vegetation very shortly after glacial retreat. Our study shows that multi-taxon metabarcoding of sedimentary ancient DNA from lake cores is a valuable tool both for terrestrial and aquatic paleoecology, even in low-productivity ecosystems such as the High Arctic.
Lophozia svalbardensis (Lophoziaceae) in continental North America, Greenland and Siberia, its identity, variation, and differentiation
<p>Lophozia excisa var. succulenta (≡ Lophoziopsis excisa var. succulenta) is a synonym of Lophozia svalbardensis. This conclusion is based on morphological investigation and a subsequent molecular-genetic study which revealed an absence of variability amon nucleotide sequences of ITS1-2 nrDNA and trnL-F cpDNA in specimens from Arctic Alaska, west Siberian Arctic and Svalbard. Lophozia svalbardensis is reported for the first time for continental North America, Greenland and Siberia based on revised data on the distribution of Lophozia excisa var. succulenta. An expanded description of Lophozia svalbardensis, its variation, differentiation and photomicrographs of specimens from the Seward and Gydanskiy peninsulas are provided. The variability of pigmentation pattern, cell walls, perianth structure and gemmae is described.</p>
Data from: Lake sediment multi-taxon DNA from North Greenland records early post-glacial appearance of vascular plants and accurately tracks environmental changes
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Data from: Small Carbonaceous Fossils (SCFs) from North Greenland: new light on metazoan diversity in early Cambrian shelf environments
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Lophozia svalbardensis (Lophoziaceae) in continental North America, Greenland and Siberia, its identity, variation, and differentiation
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Accelerating ice loss from peripheral glaciers in North Greenland
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Retreat of Humboldt Gletscher, North Greenland, driven by undercutting from a warmer ocean
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The Yarlung Zangbo River valley in the Tibetan Plateau as the dust source to Greenland and the North Pacific
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Fig. 17 in Hyoliths and small shelly fossils from the Lower Cambrian of North-East Greenland
Fig. 17. Map of the Early Cambrian world showing distribution of taxa documented herein (modified after C.R. Scotese, University of California)
Fig. 15 in Hyoliths and small shelly fossils from the Lower Cambrian of North-East Greenland
Fig. 15. Cassitella baculata sp. nov. A. MGUH 27130, holotype; scale bars 0.2 mm; A1, view from above; A2, lateral view; A3, oblique lateral view showing ridges; A4, view showing fold and ridges. B. MGUH 27131, exterior view from above; scale bar 0.5 mm. C. MGUH 27132; scale bars 0.2 mm except C4 which is 0.1 mm; C1, oblique lateral view showing ridges; C2, view showing fold and ridges; C3, view from above; C4, enlarged view of "protoconch". D. MGUH 27133, from GGU sample 314807; scale bars 1 mm; D1, oblique lateral view; D2, oblique view of exterior. E. MGUH 27134; scale bars 0.5 mm; E1, lateral view of interior showing diverging ridges; E2, view from above of interior showing diverging ridges. F. MGUH 27135, from GGU sample 314807; scale bars 1 mm except F3 which is 0.2 mm; F1, lateral view of interior showing diverging ridges; F2, view from above of interior showing diverging ridges; F3, enlarged view of termination of ridge. All specimens, except D and F, from GGU sample 314835.
Fig. 16 in Hyoliths and small shelly fossils from the Lower Cambrian of North-East Greenland
Fig. 16. Table showing distribution outside North−East Greenland of taxa documented herein. Forms endemic to Greenland are included for completeness.
Fig. 12 in Hyoliths and small shelly fossils from the Lower Cambrian of North-East Greenland
Fig. 12. Cupitheca holocyclata (Bengtson, 1990b). A. MGUH 27114; A1, apical view showing septum; A2, lateral view showing shell with ornamentation. B. MGUH 27115; B1, B2, oblique views of apical septum with structure of shell wall visible in B2. C. MGUH 27116. From GGU sample 314809. Lateral view showing apical septum. D. MGUH 27117; D1, lateral view showing apical septum; note oblique angle of constriction; D2, enlarged view of apical septum and constriction. E. MGUH 27118, lateral view showing apical septum. All specimens except C from GGU sample 314807. Scale bars 0.2 mm except B2 which is 0.1 mm.
Fig. 11 in Hyoliths and small shelly fossils from the Lower Cambrian of North-East Greenland
Fig. 11. Cupitheca hemicyclata (Bengtson, 1990b). A. MGUH 27112. B. MGUH 27113. Both specimens from GGU sample 314835. Scale bars 0.2 mm.
Fig. 7. Operculum B. A. MGUH 27106 in Hyoliths and small shelly fossils from the Lower Cambrian of North-East Greenland
Fig. 7. Operculum B. A. MGUH 27106; exterior view of operculum from above. B. MGUH 27107; B1, interior view from above; B2, lateral view; B3, interior view showing distal edges of clavicles. Both from GGU sample 314933. Scale bars 0.2 mm.
Fig. 5 in Hyoliths and small shelly fossils from the Lower Cambrian of North-East Greenland
Fig. 5. Exterior view of operculum of Parkula bounites Bengtson, 1990, MGUH 27101, showing possible borehole. From GGU sample 314807. Scale bar 0.2 mm.
Fig. 6. A, B. Hyptiotheca karraculum Bengtson, 1990a. A. MGUH 3522 in Hyoliths and small shelly fossils from the Lower Cambrian of North-East Greenland
Fig. 6. A, B. Hyptiotheca karraculum Bengtson, 1990a. A. MGUH 3522, exterior view of operculum from above. B. MGUH 27102; B1, interior view with ridges emanating from central raised region and terminating at edge of raised region; B2, lateral view; B3, lateral view showing edge of ridge. C–E. Operculum A. C. MGUH 27103; C1, internal mould of interior of operculum showing semi−circular cardinal processes and elongate clavicles; C2, lateral view with conical shield to right. D. MGUH 27104; D1, interior of operculum with clavicles in foreground; D2, interior of operculum with cardinal processes at right edge of photograph. E. MGUH 27105; E1, exterior view of operculum from above; E2, oblique view from dorsal edge showing cardinal processes; E3, oblique exterior view. A, from the collections of C. Poulsen; B–D, from GGU sample 314835; E from GGU sample 314807. Scale bars 0.2 mm, except A which is 1 mm and B1–B3 which are 0.5 mm.
Fig. 8. A–D in Hyoliths and small shelly fossils from the Lower Cambrian of North-East Greenland
Fig. 8. A–D. "Hyolithus (Hyolithus) americanus Billings, 1872". A. MGUH 3531, venter. B. MGUH 3530, venter. C. MGUH 3532; C1, left lateral edge; C2, oblique view of left lateral edge with venter on left; C3, venter. D. MGUH 3529, venter, with apex of smaller hyolith protruding from conch. E. "Hyolithus (Hyolithus) mutatus Poulsen, 1932", MGUH 3534; E1, cross−section; E2, venter in apertural region; E3, magnified view of shell on right flank of dorsum; E4, dorsum; E5, left flank of dorsum; E6, right flank of dorsum. F. "Hyolithus (Hyolithus) sp." MGUH 3536; F1, dorsum; F2, venter. All from the collections of C. Poulsen. Scale bars 5 mm, except E3 which is 1 mm.
Fig. 3. A, B. Microcornus eximius Duan, 1984. A. MGUH 27085 in Hyoliths and small shelly fossils from the Lower Cambrian of North-East Greenland
Fig. 3. A, B. Microcornus eximius Duan, 1984. A. MGUH 27085; A1, dorsum; A2, right flank of dorsum; A3, venter; A4, cross−section and view of dorsum from aperture. B. MGUH 27086; B1, dorsum; B2, cross−section and view of dorsum from aperture. C, D. Microcornus petilus Bengtson, 1990a. C. MGUH 27087, venter. D. MGUH 27088; D1, dorsum; D2, venter. E, F. Paracornus poulseni gen. et sp. nov. E. MGUH 27089, holotype; E1, dorsum; E2, venter; E3, enlarged view of ornament at right lateral edge (venter to right). F. MGUH 27090, dorsum. G. Parkula bounites Bengtson, 1990a, MGUH 27091; G1, exterior of operculum from above; G2, exterior of operculum from conical shield; G3, lateral view of operculum with conical shield to right; G4, exterior of operculum with cardinal shield in foreground. A, D–G, from 314835; B, from GGU sample 314906; C, from GGU sample 314904. Scale bars 0.2 mm, except E3 which is 50 µm.
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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)
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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.