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  • Data  (18)
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  • 1
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    Effects and forcings on sea ice index for marine sediment core MD01-2414 from the central Okhotsk Sea (2018)
    PANGAEA
    Details
    Publication Date: 2024-03-23
    Keywords: AGE; Giant piston corer; GPC; IMAGES VII - WEPAMA; Marion Dufresne (1995); MD012414; MD01-2414; MD122; Number; Sea of Ochotsk
    Type: Dataset
    Format: text/tab-separated-values, 520 data points
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    DATA PANGAEA
  • 2
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    Summer sea surface temperatures for marine sediment core MD01-2414 from the central Okhotsk Sea (2018)
    PANGAEA
    Details
    Publication Date: 2024-03-23
    Keywords: AGE; DEPTH, sediment/rock; Giant piston corer; GPC; IMAGES VII - WEPAMA; Marion Dufresne (1995); MD012414; MD01-2414; MD122; Sea of Ochotsk; Sea surface temperature, summer
    Type: Dataset
    Format: text/tab-separated-values, 63 data points
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    DATA PANGAEA
  • 3
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    HBI concentrations and classification tree model predictions of sea ice conditions for surface sediments and downcore records in the Barents Sea (2017)
    PANGAEA
    In:  Supplement to: Köseoğlu, Denizcan; Belt, Simon T; Smik, Lukas; Yao, Haoyi; Panieri, Giuliana; Knies, Jochen (2018): Complementary biomarker-based methods for characterising Arctic sea ice conditions: A case study comparison between multivariate analysis and the PIP25 index. Geochimica et Cosmochimica Acta, 222, 406-420, https://doi.org/10.1016/j.gca.2017.11.001
    Details
    Publication Date: 2024-03-18
    Description: We investigated the potential for classification tree (CT) models to provide a further approach to paleo Arctic sea ice reconstruction through analysis of a suite of six highly branched isoprenoid (HBI) biomarkers in 198 surface sediments from the Barents Sea. The four CT models representing modern sea ice conditions were then applied to four downcore records within the study area (cores BASICC 1, 8, 43, and core MSM5/5-712-1) in order to reconstruct sea ice conditions over the last 300 years. The current dataset includes the absolute HBI concentrations in all sediment samples (ng/g dry sed.), as well as CT model outcomes for all samples, which were classified as having experienced marginal, intermediate, or extensive overlying sea ice cover (further details are available in the manuscript associated with these data).
    Type: Dataset
    Format: application/zip, 2 datasets
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  • 4
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    Concentrations of IPSO25 in surface sediments from coastal and near-coastal Antarctic locations (2016)
    PANGAEA
    In:  Supplement to: Belt, Simon T; Smik, Lukas; Brown, Thomas A; Kim, Jung-Hyun; Rowland, Steve J; Allen, Claire Susannah; Gal, Jong-Ku; Shin, Kyung-Hoon; Lee, Jae Il; Taylor, Kyle W R (2016): Source identification and distribution reveals the potential of the geochemical Antarctic sea ice proxy IPSO25. Nature Communications, 7, 12655, https://doi.org/10.1038/ncomms12655
    Details
    Publication Date: 2024-03-18
    Description: The presence of a di-unsaturated highly branched isoprenoid (HBI) lipid biomarker (diene II) in Southern Ocean sediments has previously been proposed as a proxy measure of palaeo Antarctic sea ice. Here we show that a source of diene II is the sympagic diatom Berkeleya adeliensis Medlin. Furthermore, the propensity for B. adeliensis to flourish in platelet ice is reflected by an offshore downward gradient in diene II concentration in 〉100 surface sediments from Antarctic coastal and near-coastal environments. Since platelet ice formation is strongly associated with super-cooled freshwater inflow, we further hypothesize that sedimentary diene II provides a potentially sensitive proxy indicator of landfast sea ice influenced by meltwater discharge from nearby glaciers and ice shelves, and re-examination of some previous diene II downcore records supports this hypothesis. The term IPSO25-Ice Proxy for the Southern Ocean with 25 carbon atoms-is proposed as a proxy name for diene II.
    Keywords: Antarctic Peninsula; ANT-II/3; ANT-III/3; ANT-IV/2; ANT-IV/3; ANT-IV/4; ANT-IX/3; ANT-VI/2; ANT-VI/3; ANT-VIII/5; ANT-VIII/6; Atka Bay; Bransfield Strait; Campaign of event; Camp Norway; Cape Fiske; Date/Time of event; DEPTH, sediment/rock; Drake Passage; Elevation of event; Event label; Filchner Shelf; Filchner Trough; Fram Strait; Gas chromatography - Mass spectrometry (GC-MS); Giant box corer; GKG; Gould Bay; Greenland Slope; Halley Bay; Ice Proxy for the Southern Ocean with 25 carbon atoms per unit sediment mass; Kapp Norvegia; King George Island, Antarctic Peninsula; Latitude of event; Lazarev Sea; Location of event; Longitude of event; Lyddan Island; Maud Rise; Optional event label; Polarstern; Polarstern Kuppe; PS04; PS04/225; PS06/289; PS06/303; PS06/313; PS06/329; PS06 SIBEX; PS08; PS08/294; PS08/324; PS08/327; PS08/333; PS08/338; PS08/340; PS08/344; PS08/345; PS08/346; PS08/347; PS08/350; PS08/353; PS08/354; PS08/355; PS08/356; PS08/364; PS08/366; PS08/368; PS08/374; PS08/375; PS08/379; PS08/380; PS08/381; PS08/382; PS08/386; PS08/396; PS08/402; PS08/445; PS08/601; PS1138-8; PS12; PS12/119; PS12/122; PS12/127; PS12/129; PS12/195; PS12/458; PS1273-1; PS1277-1; PS1282-1; PS1284-1; PS1345-8; PS1364-1; PS1366-2; PS1367-1; PS1370-1; PS1371-1; PS1372-2; PS1373-2; PS1374-2; PS1375-2; PS1376-2; PS1377-1; PS1378-1; PS1379-1; PS1380-1; PS1386-1; PS1388-1; PS1390-1; PS1394-1; PS1395-1; PS1396-1; PS1397-1; PS1398-2; PS1399-1; PS1402-2; PS1406-1; PS1412-1; PS1421-1; PS1453-1; PS1539-1; PS1540-1; PS1542-1; PS1544-1; PS1559-1; PS16; PS16/432; PS16/472; PS16/499; PS16/507; PS16/516; PS16/518; PS16/525; PS16/536; PS16/540; PS16/541; PS16/547; PS16/549; PS1635-2; PS1798-2; PS18; PS18/148; PS18/171; PS18/214; PS18/218; PS18/221; PS1802-2; PS1803-2; PS1805-5; PS1812-5; PS1813-5; PS1817-5; PS1822-1; PS1823-1; PS1824-2; PS1825-5; PS1826-2; PS2006-1; PS2024-3; PS2062-2; PS2065-1; PS2067-1; Weddell Sea
    Type: Dataset
    Format: text/tab-separated-values, 57 data points
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    DATA PANGAEA
  • 5
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    Sea-ice biomarkers, benthic and planktonic foraminiferal geochemistry, and benthic foraminiferal assemblage data from IODP Site U1343 between ~7 ka and 40 ka (2020)
    PANGAEA
    Details
    Publication Date: 2024-03-18
    Description: The dataset compiles sea-ice biomarkers (IP25, HBI II, HBI III, Triene E, Brassicasterol, Campesterol, Cholesterol, β- sitosterol) together with benthic and planktonic foraminiferal geochemistry (U/Ca, Mn/Ca, U/Mn, Mg/Ca) and benthic foraminiferal assemblage counts from Integrated Ocean Drilling Program Site U1343 in the eastern Bering Sea. The dataset covers the time range from 7.6-42 ka.
    Keywords: (9E)-2,6,10,14-Tetramethyl-7-(3-methylpent-4-enyliden)pentadeca-9-ene per unit sediment mass; (9Z)-2,6,10,14-Tetramethyl-7-(3-methylpent-4-enyliden)pentadeca-9-ene per unit sediment mass; 2,10,14-Trimethyl-6-enyl-7-(3-methylpent-1-enyl)pentadecene per unit sediment mass; 2,6,10,14-Tetramethyl-7-(3-methylpent-4-enyl)pentadecane per unit sediment mass; 24-Ethylcholest-5-en-3beta-ol, fraction; 24-Methylcholest-5-en-3beta-ol, fraction; 24-Methylcholesta-5,22E-dien-3beta-ol per unit sediment mass; 323-U1343; AGE; Bering Sea; Bering Sea Paleoceanography; Bulimina exilis; Cassidulinoides parkeriana; Cholesterol, fraction; Classification; COMPCORE; Composite Core; Counting; DEPTH, sediment/rock; Elphidium batialis; Epistominella pulchella; Exp323; Foraminifera, benthic, other; Foraminifera, benthic, total; Gas chromatography - Mass spectrometry (GC-MS); Globobulimina spp.; Integrated Ocean Drilling Program / International Ocean Discovery Program; IODP; Islandiella norcrossi; Joides Resolution; Magnesium/Calcium ratio; Manganese/Calcium ratio; Nonionella digitata; Nonionella labradorica; Phytoplankton biomarker Brassicasterol IP25 index; Phytoplankton biomarker C25 HBI (Z) triene IP25 index; Species; Uranium/Calcium ratio; Uranium/Manganese ratio; Uvigerina spp.; Valvulineria araucana
    Type: Dataset
    Format: text/tab-separated-values, 769 data points
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    DATA PANGAEA
  • 6
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    Ocean surface and bottom water conditions, iceberg drift and sediment transport on the North Iceland margin during MIS 3 and 2 (2021)
    PANGAEA
    Details
    Publication Date: 2024-03-18
    Description: Radiocarbon dates and marine tephra suggest that the upper 10 m of core MD99-2274 off North Iceland extends from ~0 to ~65 ka BP. A multi-proxy sediment and biomarker study at a ~0.5 ky resolution is used to derive a paleoclimate scenario for this area of the southwestern Nordic Seas, which during the Holocene had intermittent excursions of icebergs and a seasonal cover of drifting sea ice across the site. The sortable silt mean size (S̅S̅) suggests a bottom current (1000 m depth) flow speed maximum to minimum range of ~8 cm/s during Marine Isotope Stages 2 to 3, but the data are unreliable for the Holocene. Slow-down in flow speeds may be associated with massive ice and water discharges linked to the Hudson Strait ice stream (H-events) and to melt of icebergs from Greenland in the Nordic seas where convection would have been suppressed. Five pulses of sediment with a distinct felsic component are associated with iceberg transport from E/NE Greenland. Sea ice, open water and sea surface temperature (SST) biomarker proxies (i.e. IP25, brassicasterol and alkenones) all point towards near-perennial sea ice cover during MIS 3 and 2, rather than seasonal sea ice or open water conditions. Indeed, our biomarker and sediment data require that the seas north of Iceland have a thick, nearly continuous cover of sea-ice through which icebergs, calved from ice stream termini, drift slowly southward. The cross-correlation of the quartz % records between MD99-2274 and the well-dated core PS2644 in Blosseville Basin indicates significant coherence in the records at a multi-millennial (~8 ky) timescale. A transition to open ocean conditions is evident from the early Holocene onwards, albeit with the occurrence of some drift ice and icebergs.
    Keywords: 1553Is/Fr; Alkenones; CALYPSO; Calypso Corer; flow speeds; Iceland margin; IMAGES V; Marion Dufresne (1995); MD114; MD99-2274; Mineral compositions; North Iceland Shelf; sea ice biomarker
    Type: Dataset
    Format: application/zip, 4 datasets
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  • 7
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    Sea-ice biomarkers, benthic and planktonic foraminiferal geochemistry, and benthic foraminiferal assemblage data from IODP Site U1343 between ~7 ka and 40 ka (2020)
    PANGAEA
    Details
    Publication Date: 2024-03-18
    Description: The dataset compiles sea-ice biomarkers (IP25, HBI II, HBI III, Triene E, Brassicasterol, Campesterol, Cholesterol, β- sitosterol) together with benthic and planktonic foraminiferal geochemistry (U/Ca, Mn/Ca, U/Mn, Mg/Ca) and benthic foraminiferal assemblage counts from Integrated Ocean Drilling Program Site U1343 in the eastern Bering Sea. The dataset covers the time range from 7.6-42 ka.
    Keywords: (9E)-2,6,10,14-Tetramethyl-7-(3-methylpent-4-enyliden)pentadeca-9-ene per unit sediment mass; (9Z)-2,6,10,14-Tetramethyl-7-(3-methylpent-4-enyliden)pentadeca-9-ene per unit sediment mass; 2,10,14-Trimethyl-6-enyl-7-(3-methylpent-1-enyl)pentadecene per unit sediment mass; 2,6,10,14-Tetramethyl-7-(3-methylpent-4-enyl)pentadecane per unit sediment mass; 24-Ethylcholest-5-en-3beta-ol per unit sediment mass; 24-Methylcholest-5-en-3beta-ol per unit sediment mass; 24-Methylcholesta-5,22E-dien-3beta-ol per unit sediment mass; 323-U1343; AGE; Bering Sea; Bering Sea Paleoceanography; Bulimina exilis; Cassidulinoides parkeriana; Cholesterol per unit sediment mass; Classification; COMPCORE; Composite Core; Counting; DEPTH, sediment/rock; Elphidium batialis; Epistominella pulchella; Exp323; Foraminifera, benthic, other; Foraminifera, benthic, total; Gas chromatography - Mass spectrometry (GC-MS); Globobulimina spp.; Integrated Ocean Drilling Program / International Ocean Discovery Program; IODP; Islandiella norcrossi; Joides Resolution; Manganese/Calcium ratio; Nonionella digitata; Nonionella labradorica; Phytoplankton biomarker Brassicasterol IP25 index; Phytoplankton biomarker C25 HBI (Z) triene IP25 index; Species; Uranium/Calcium ratio; Uranium/Manganese ratio; Uvigerina spp.; Valvulineria araucana
    Type: Dataset
    Format: text/tab-separated-values, 762 data points
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    DATA PANGAEA
  • 8
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    Biomarker of sediment core MD99-2274 (2021)
    PANGAEA
    Details
    Publication Date: 2024-03-18
    Keywords: 1553Is/Fr; 2,6,10,14-Tetramethyl-7-(3-methylpent-4-enyl)pentadecane per unit sediment mass; 24-Methylcholesta-5,22E-dien-3beta-ol per unit sediment mass; Alkenone, C37:2 per unit sediment mass; Alkenone, C37:3, per unit sediment mass; Alkenone, C37:3+C37:2; Alkenone, C37:4; Alkenones; CALYPSO; Calypso Corer; Depth, bottom/max; DEPTH, sediment/rock; Depth, top/min; Diene highly branched isoprenoids per unit sediment mass; flow speeds; Iceland margin; IMAGES V; Marion Dufresne (1995); MD114; MD99-2274; Mineral compositions; North Iceland Shelf; sea ice biomarker; Sea surface temperature
    Type: Dataset
    Format: text/tab-separated-values, 657 data points
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  • 9
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    Age-depth record of sediment core MD99-2274 (2021)
    PANGAEA
    Details
    Publication Date: 2024-03-18
    Keywords: 1553Is/Fr; AGE; Age, maximum/old; Age, minimum/young; Alkenones; CALYPSO; Calypso Corer; DEPTH, sediment/rock; flow speeds; Iceland margin; IMAGES V; Marion Dufresne (1995); MD114; MD99-2274; Mineral compositions; North Iceland Shelf; sea ice biomarker
    Type: Dataset
    Format: text/tab-separated-values, 1492 data points
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  • 10
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    Grain size distribution of sediment core MD99-2274 (2021)
    PANGAEA
    Details
    Publication Date: 2024-03-18
    Keywords: 1553Is/Fr; Alkenones; CALYPSO; Calypso Corer; DEPTH, sediment/rock; flow speeds; Grain size, Mastersizer Micro, Malvern Instrument Inc.; Iceland margin; IMAGES V; Marion Dufresne (1995); MD114; MD99-2274; Median, grain size; Mineral compositions; North Iceland Shelf; Percentile 10; Percentile 90; Sample code/label; sea ice biomarker; Size fraction
    Type: Dataset
    Format: text/tab-separated-values, 3150 data points
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    DATA PANGAEA
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