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  • Center for Marine Environmental Sciences; MARUM  (2)
  • 250-355 µm fraction; 355-425 µm fraction; AGE; Center for Marine Environmental Sciences; DEPTH, sediment/rock; EISPAC/WESTWIND; GC; GeoB17426-3; Globigerinoides ruber, Magnesium/Calcium ratio; Globigerinoides ruber, δ18O; Gravity corer; MARUM; Pulleniatina obliquiloculata, Magnesium/Calcium ratio; Pulleniatina obliquiloculata, δ18O; SO228; Sonne  (1)
  • 8.2 event  (1)
Document type
Keywords
Publisher
Language
Years
  • 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
    Location Call Number Limitation Availability
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    CITATION GEO-LEO
  • 2
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    Documentation of sediment cores during SONNE Expedition SO228 from the western tropical Pacific (2013)
    PANGAEA
    In:  Supplement to: Mohtadi, Mahyar; Bergmann, Fenna; Blanquera, Ralph Vinzon; Buleka, Joe; Carag, John Warner; Carriére-Garwood, Jessica; Dassié, Emilie Pauline; Fernando, Allan Gil; Gernhardt, Fabian; Ghasemifard, Homa; Groeneveld, Jeroen; Hathorne, Ed C; Huang, C C; Huang, Enqing; Janßen, Christoph Gregor; Kerrigan, Elizabeth; Kienast, Markus; Kremer, Anne; Kwiatkowski, Cornelia; Lehnen, Christina; Lückge, Andreas; Mai, Anh Hoang; Martínez Méndez, Gema; Meyer-Schack, Birgit; Nishibayashi, Mark Hacker; Plaß, Anna; Quevedo, Jay Mar; Rincon, Miguel; Schwenk, Tilmann; Seeba, Hanno; Setiawan, Riza Yuliratno; Steinke, Stephan; Tevlone, Amanda; Wenau, Stefan; Yu, Pai-Sen (2013): Report and preliminary results of RV SONNE cruise SO-228, Kaohsiung-Townsville, 04.05.2013-23.06.2013, EISPAC-WESTWIND-SIODP. Berichte aus dem MARUM und dem Fachbereich Geowissenschaften der Universität Bremen, 295, 110 pp, urn:nbn:de:gbv:46-00103343-13
    Details
    Publication Date: 2023-03-03
    Description: The core descriptions (chapter 7) summarize the most important results of the analysis of each sediment core following procedures applied during ODP/IODP expeditions. All cores were opened, described, and color-scanned. In the core descriptions the first column displays the lithological data that are based on visual analysis of the core and are supplemented by information from binocular and smear slide analyses. The sediment classification largely follows ODP/IODP convention. Lithological names consist of a principal name based on composition, degree of lithification, and/or texture as determined from visual description and microscopic observations. In the structure column the intensity of bioturbation together with individual or special features (turbidites, volcanic ash layers, plant debris, shell fragments, etc.) is shown. The hue and chroma attributes of color were determined by comparison with the Munsell soil color charts and are given in the color column in the Munsell notation. A GretagMacbethTM Spectrolino spectrophotometer was used to measure percent reflectance values of sediment color at 36 wavelength channels over the visible light range (380-730 nm) on all of the cores. The digital reflectance data of the spectrophotometer readings were routinely obtained from the surface (measured in 1 cm steps) of the split cores (archive half). The Spectrolino is equipped with a measuring aperture with folding mechanism allowing an exact positioning on the split core and is connected to a portable computer. The data are directly displayed within the software package Excel and can be controlled simultaneously. From all the color measurements, for each core the red/blue ratio (700 nm/450 nm) and the lightness are shown together with the visual core description. The reflectance of individual wavelengths is often significantly affected by the presence of minor amounts of oxyhydroxides or sulphides. To eliminate these effects, we used the red/blue ratio and lightness.
    Keywords: Center for Marine Environmental Sciences; MARUM
    Type: Dataset
    Format: application/zip, 37 datasets
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 3
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    Planktic foraminiferal Mg/Ca and oxygen isotope data of sediment core GeoB17426-3 (2019)
    PANGAEA
    Details
    Publication Date: 2023-10-20
    Keywords: 250-355 µm fraction; 355-425 µm fraction; AGE; Center for Marine Environmental Sciences; DEPTH, sediment/rock; EISPAC/WESTWIND; GC; GeoB17426-3; Globigerinoides ruber, Magnesium/Calcium ratio; Globigerinoides ruber, δ18O; Gravity corer; MARUM; Pulleniatina obliquiloculata, Magnesium/Calcium ratio; Pulleniatina obliquiloculata, δ18O; SO228; Sonne
    Type: Dataset
    Format: text/tab-separated-values, 954 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 4
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    Planktic foraminiferal Mg/Ca and oxygen isotope data of sediment core GeoB17426-3 from the Western Pacific Warm Pool (2019)
    PANGAEA
    Details
    Publication Date: 2023-11-21
    Keywords: Center for Marine Environmental Sciences; MARUM
    Type: Dataset
    Format: application/zip, 2 datasets
    Location Call Number Limitation Availability
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    DATA PANGAEA
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