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  • 2020-2024  (8)
  • 2023  (8)
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  • 2020-2024  (8)
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  • 1
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    Biomarker Records of Environmental Shifts on the Labrador Shelf During the Holocene (2023)
    Details
    Publication Date: 2024-02-28
    Description: 〈title xmlns:mml="http://www.w3.org/1998/Math/MathML"〉Abstract〈/title〉〈p xmlns:mml="http://www.w3.org/1998/Math/MathML" xml:lang="en"〉The ultimate demise of the Laurentide Ice Sheet (LIS) and the preceding and succeeding oceanographic changes along the western Labrador Sea offer insights critically important to improve climate predictions of expected future climate warming and further melting of the Greenland ice cap. However, while the final disappearance of the LIS during the Holocene is rather well constrained, the response of sea ice during the resulting meltwater events is not fully understood. Here, we present reconstructions of paleoceanographic changes over the past 9.3 Kyr BP on the northwestern Labrador Shelf, with a special focus on the interaction between the final meltwater event around 8.2 Kyr BP and sea ice and phytoplankton productivity (e.g., IP〈sub〉25〈/sub〉, HBI III (Z), brassicasterol, dinosterol, biogenic opal, total organic carbon). Our records indicate low sea‐ice cover and high phytoplankton productivity on the Labrador Shelf prior to 8.9 Kyr BP, sea‐ice formation was favored by decreased surface salinities due to the meltwater events from Lake Agassiz‐Ojibway and the Hudson Bay Ice Saddle from 8.55 Kyr BP onwards. For the past ca. 7.5 Kyr BP sea ice is mainly transported to the study area by local ocean currents such as the inner Labrador and Baffin Current. Our findings provide new insights into the response of sea ice to increased meltwater discharge as well as shifts in atmospheric and oceanic circulation.〈/p〉
    Description: Key Points: 〈list list-type="bullet"〉 〈list-item〉 〈p xml:lang="en"〉Sea ice on the Labrador Shelf mainly follows the solar insolation and meltwater input from the decaying Laurentide Ice Sheet〈/p〉〈/list-item〉 〈list-item〉 〈p xml:lang="en"〉Sea ice increased following the Lake Agassiz outburst and Hudson Bay Ice Saddle Collapse between 8.5 and 8.2 Kyr BP〈/p〉〈/list-item〉 〈list-item〉 〈p xml:lang="en"〉Low sea ice conditions during the Holocene Thermal Maximum were replaced by an increase following the Neoglacial cooling trend〈/p〉〈/list-item〉 〈/list〉 〈/p〉
    Description: Ocean Frontier Institute
    Description: NSERC
    Description: https://doi.org/10.4095/221564
    Description: https://doi.org/10.1594/PANGAEA.949244
    Description: https://doi.org/10.5281/zenodo.8247131
    Description: https://doi.org/10.1594/PANGAEA.949065
    Description: https://doi.org/10.1594/PANGAEA.949056
    Keywords: ddc:551.7 ; sea ice ; Atlantic Ocean ; IP25 ; 8.2 event
    Language: English
    Type: doc-type:article
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    CITATION GEO-LEO
  • 2
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    Last Interglacial biomarker, dinoflagellate cyst, and stable oxygen isotope data from sediment core GS16-204-22CC-B (2023)
    PANGAEA
    Details
    Publication Date: 2023-10-16
    Description: The dataset contains measurements of organic biomarkers and sterols, dinoflagellate cyst census counts, and benthic and planktonic stable oxygen isotope data from core GS16-204-22CC-B on the Eirik Drift (58°02.83′N, 47°02.36′W; 3160 m water depth) for Marine Isotope Stage 6, 5e and 5d. Total Organic Carbon (TOC), the Highly Branched Isoprenoids (HBIs) IP25, HBI II, HBI III (Z), and HBI III (E), and the sterols brassicasterol, dinosterol, campesterol and sitosterol were measured in the organic geochemistry lab at the Alfred Wegener Institute, Bremerhaven, Germany. Biomarker values are presented as biomarker/g dry sediment and biomarker/g TOC. Dinoflagellate cysts were counted along non overlapping traverses at x40 magnification using a transmitted light microscope and classified to species level as much as possible. The dataset consists of raw counts, relative abundances and dinocyst concentrations (cysts/g dry sediment). Stable oxygen isotopes (δ18O) were measured on the planktic foraminifera Neogloboquadrina pachyderma (sinistral) and benthic foraminifera Cibicidoides wuellestorfi. Values are reported relative to Vienna Pee Dee Belemnite. The measurements were carried out at FARLAB, University of Bergen, Norway. The age model for core GS16-204-22CC-B was obtained by correlation of benthic and planktic δ18O measured in this core with previously published isotope records in Irvali et al. (2012; 2016) and a 14C age from Griem et al. (2019).
    Keywords: Biomarkers; Dinoflagellate cysts; Eirik Drift; IP25; isotopes; MIS 5
    Type: Dataset
    Format: application/zip, 5 datasets
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    DATA PANGAEA
  • 3
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    Multibeam bathymetry processed data (Atlas Hydrosweep DS 3 echo sounder entire dataset) of RV POLARSTERN during cruise PS115/2, Southern Lomonosov Ridge, Arctic Ocean (2023)
    PANGAEA
    Details
    Publication Date: 2024-04-20
    Description: Multibeam data were collected during RV Polarstern cruise PS115/2 (2018-09-05 to 2018-10-16). Multibeam sonar system was Atlas Hydrographic Hydrosweep DS 3 multibeam echo sounder. Data are processed with Caris HIPS, including sound velocity correction with SV data from SVPs and World Ocean Atlas 13 (https://doi.org/10.7289/v5f769gt), tidal correction with TPXO9_atlas_v5 (https://www.tpxo.net/global/tpxo9-atlas), and manual cleaning. The soundings are combined in daily files, the format is XYZ ASCII (〈Lon〉 〈Lat〉 〈Depth in meters, positive up, relative to mean sea level〉). Additional blockmedian grids have been computed with depth dependent cell size to visualize the data. These grids are not meant for scientific analysis or navigation, but for overview purposes only.
    Keywords: Arctic Ocean; Area; Bathymetry; Binary Object; Binary Object (File Size); Binary Object (Media Type); DS3; Elevation, maximum; Elevation, minimum; File content; Horizontal datum; Horizontal datum, projection stored in file; Hydrosweep DS3; Latitude, northbound; Latitude, southbound; Longitude, eastbound; Longitude, westbound; Multibeam; Number of depth soundings; Polarstern; PS115/2; PS115/2_0_Underway-1; Raster cell size; Southern Lomonosov Ridge; Swath-mapping system Atlas Hydrosweep DS-3; Vertical datum
    Type: Dataset
    Format: text/tab-separated-values, 525 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 4
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    Last Interglacial grouped dinoflagellate cyst data from sediment core GS16-204-22CC-B (2023)
    PANGAEA
    Details
    Publication Date: 2024-06-12
    Keywords: AGE; Batch; Biomarkers; Bitectatodinium tepikiense; CALYPSO; Calypso Corer; Coefficient of variation; DEPTH, sediment/rock; Depth, sediment/rock, bottom/maximum; Depth, sediment/rock, top/minimum; Dinoflagellate cyst; Dinoflagellate cysts; Dinoflagellates, other; Dry mass; Eirik Drift; G. O. Sars (2003); GS16-204-22CC-B; GS2016-204; Impagidinium pallidum; Impagidinium spp.; IP25; Islandinium minutum; isotopes; Laboratory code/label; Lycopodium clavatum (added); Lycopodium clavatum (added), standard deviation; Lycopodium clavatum markers counted; MIS 5; Nematosphaeropsis labyrinthus; Operculodinium centrocarpum sensu Wall and Dale (1966); Pentapharsodinium dalei cyst; Spiniferites elongatus; Spiniferites mirabilis; Spiniferites spp.; Tablets
    Type: Dataset
    Format: text/tab-separated-values, 1870 data points
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    DATA PANGAEA
  • 5
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    Last Interglacial dinoflagellate cyst data from sediment core GS16-204-22CC-B (2023)
    PANGAEA
    Details
    Publication Date: 2024-06-12
    Keywords: AGE; Ataxiodinium cf. zevenboomii; Ataxiodinium choane; Batch; Biomarkers; Bitectatodinium tepikiense; Brigantedinium cariacoense; Brigantedinium simplex; Brigantedinium spp.; CALYPSO; Calypso Corer; Coefficient of variation; Dalella chathamensis; DEPTH, sediment/rock; Depth, sediment/rock, bottom/maximum; Depth, sediment/rock, top/minimum; Dinoflagellate cyst; Dinoflagellate cyst, error; Dinoflagellate cyst per unit mass; Dinoflagellate cysts; Dry mass; Eirik Drift; G. O. Sars (2003); GS16-204-22CC-B; GS2016-204; Impagidinium aculeatum; Impagidinium pallidum; Impagidinium paradoxum; Impagidinium patulum; Impagidinium plicatum; Impagidinium sphaericum; Impagidinium spp.; IP25; Islandinium brevispinosum; Islandinium minutum; Islandinium spp.; isotopes; Laboratory code/label; Lingulodinium machaerophorum; Lycopodium clavatum (added); Lycopodium clavatum (added), standard deviation; Lycopodium clavatum markers counted; MIS 5; Nematosphaeropsis labyrinthus; Nematosphaeropsis rigida; Nematosphaeropsis spp.; Operculodinium centrocarpum sensu Wall and Dale (1966); Operculodinium israelianum; Operculodinium janduchenei; Pentapharsodinium dalei cyst; Polarella glacialis; Polykrikos spp.; Pyxidinopsis reticulata; Scrippsiella trifida cyst; Selenopemphix quanta; Spiniferites elongatus; Spiniferites lazus; Spiniferites mirabilis; Spiniferites ramosus; Spiniferites spp.; Tablets; Trinovantedinium variabile
    Type: Dataset
    Format: text/tab-separated-values, 4248 data points
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    DATA PANGAEA
  • 6
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    Last Interglacial stable oxygen isotope data from sediment core GS16-204-22CC-B (2023)
    PANGAEA
    Details
    Publication Date: 2024-06-12
    Keywords: AGE; Biomarkers; CALYPSO; Calypso Corer; Cibicidoides wuellerstorfi, δ18O; DEPTH, sediment/rock; Depth, sediment/rock, bottom/maximum; Depth, sediment/rock, top/minimum; Dinoflagellate cysts; Eirik Drift; G. O. Sars (2003); GS16-204-22CC-B; GS2016-204; IP25; isotopes; MIS 5; Neogloboquadrina pachyderma sinistral, δ18O
    Type: Dataset
    Format: text/tab-separated-values, 496 data points
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    DATA PANGAEA
  • 7
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    Last Interglacial age model tie points from sediment core GS16-204-22CC-B (2023)
    PANGAEA
    Details
    Publication Date: 2024-06-12
    Keywords: Age model; Biomarkers; CALYPSO; Calypso Corer; DEPTH, sediment/rock; Dinoflagellate cysts; Eirik Drift; G. O. Sars (2003); GS16-204-22CC-B; GS2016-204; IP25; isotopes; MIS 5
    Type: Dataset
    Format: text/tab-separated-values, 10 data points
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    DATA PANGAEA
  • 8
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    Last Interglacial biomarker data from sediment core GS16-204-22CC-B (2023)
    PANGAEA
    Details
    Publication Date: 2024-06-12
    Keywords: (9E)-2,6,10,14-Tetramethyl-7-(3-methylpent-4-enyliden)pentadeca-9-ene; (9E)-2,6,10,14-Tetramethyl-7-(3-methylpent-4-enyliden)pentadeca-9-ene, per unit mass total organic carbon; (9Z)-2,6,10,14-Tetramethyl-7-(3-methylpent-4-enyliden)pentadeca-9-ene; (9Z)-2,6,10,14-Tetramethyl-7-(3-methylpent-4-enyliden)pentadeca-9-ene, per unit mass total organic carbon; 2,6,10,14-Tetramethyl-7-(3-methylpent-4-enyl)pentadecane, per unit mass total organic carbon; 2,6,10,14-Tetramethyl-7-(3-methylpent-4-enyl)pentadecane per volume; 24-ethylcholest-5-en-3beta-ol, per unit mass total organic carbon; 24-Ethylcholest-5-en-3beta-ol per unit sediment mass; 24-Methylcholest-5-en-3beta-ol, per unit mass total organic carbon; 24-Methylcholest-5-en-3beta-ol per unit sediment mass; 24-Methylcholesta-5,22E-dien-3beta-ol, per unit mass total organic carbon; 24-Methylcholesta-5,22E-dien-3beta-ol per unit sediment mass; 4alpha,23,24-Trimethyl-5alpha-cholest-22E-en-3beta-ol, per unit mass total organic carbon; 4alpha,23,24-Trimethyl-5alpha-cholest-22E-en-3beta-ol per unit sediment mass; AGE; Biomarkers; CALYPSO; Calypso Corer; Carbon, organic, total; DEPTH, sediment/rock; Depth, sediment/rock, bottom/maximum; Depth, sediment/rock, top/minimum; Diene highly branched isoprenoids; Diene highly branched isoprenoids, per unit mass total organic carbon; Dinoflagellate cysts; Dry mass; Eirik Drift; G. O. Sars (2003); GS16-204-22CC-B; GS2016-204; IP25; isotopes; MIS 5
    Type: Dataset
    Format: text/tab-separated-values, 3735 data points
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    DATA PANGAEA
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