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  • 031-1; Alkenones; GC; Gravity corer; Labrador Sea; Maria S. Merian; Mg/Ca paleothermometry; MSM45; MSM45_431-1; Stable isotopes  (1)
  • 202-1240; COMPCORE; Composite Core; Equatorial East Pacific; Joides Resolution; Leg202; Ocean Drilling Program; ODP  (1)
  • 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)
Document type
Keywords
Publisher
Years
  • 1
    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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  • 2
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    PANGAEA
    In:  Supplement to: Yu, Pai-Sen; Kienast, Markus; Chen, Min-Te; Cacho, Isabel; Flores, José-Abel; Mohtadi, Mahyar; Mix, Alan C (2012): Influences of extratropical water masses on equatorial Pacific cold tongue variability during the past 160 ka as revealed by faunal evidence of planktic foraminifers. Journal of Quaternary Science, 27(9), 921-931, https://doi.org/10.1002/jqs.2582
    Publication Date: 2024-01-09
    Description: Glacial cooling (~1-5°C) in the eastern equatorial Pacific (EEP) cold tongue is often attributed to increased equatorial upwelling, stronger advection from the Peru-Chile Current (PCC), and to the more remote subpolar southeastern Pacific water mass. However, evidence is scarce for identifying unambiguously which process plays a more important role in driving the large glacial cooling in the EEP. To address this question, here we adopt a faunal calibration approach using planktic foraminifers with a new compilation of coretop data from the eastern Pacific, and present new downcore variation data of fauna assemblage and estimated sea surface temperatures (SSTs) for the past 160 ka (Marine Isotope Stage (MIS) 6) from ODP Site 1240 in the EEP. With significant improvement achieved by adding more coretop data from the eastern boundary current, our downcore calibration results indicate that most of the glacial cooling episodes over the past 160 ka in the EEP are attributable to increased influence from the subpolar water mass from high latitudes of the southern Pacific. By applying this new calibration of the fauna SST transfer function to a latitudinal transect of eastern Pacific (EP) cores, we find that the subpolar water mass has been a major dynamic contributor to EEP cold tongue cooling since MIS 6.
    Keywords: 202-1240; COMPCORE; Composite Core; Equatorial East Pacific; Joides Resolution; Leg202; Ocean Drilling Program; ODP
    Type: Dataset
    Format: application/zip, 2 datasets
    Location Call Number Limitation Availability
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  • 3
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    PANGAEA
    In:  Supplement to: Lochte, Annalena Antonia; Schneider, Ralph R; Kienast, Markus; Repschläger, Janne; Blanz, Thomas; Garbe-Schönberg, Dieter; Andersen, Nils (2020): Surface and subsurface Labrador Shelf water mass conditions during the last 6000 years. Climate of the Past, 16(4), 1127-1143, https://doi.org/10.5194/cp-16-1127-2020
    Publication Date: 2024-02-02
    Description: The Labrador Sea is important for the modern global thermohaline circulation system through the formation of intermediate Labrador Sea Water (LSW) that has been hypothesized to stabilize the modern mode of North Atlantic deep-water circulation. The rate of LSW formation is controlled by the amount of winter heat loss to the atmosphere, the expanse of freshwater in the convection region and the inflow of saline waters from the Atlantic. The Labrador Sea, today, receives freshwater through the East and West Greenland Currents (EGC, WGC) and the Labrador Current (LC). Several studies have suggested the WGC to be the main supplier of freshwater to the Labrador Sea, but the role of the southward flowing LC in Labrador Sea convection is still debated. At the same time, many paleoceanographic reconstructions from the Labrador Shelf focussed on late Deglacial to early Holocene meltwater run-off from the Laurentide Ice Sheet (LIS), whereas little information exists about LC variability since the final melting of the LIS about 7,000 years ago. In order to enable better assessment of the role of the LC in deep-water formation and its importance for Holocene climate variability in Atlantic Canada, this study presents high-resolution middle to late Holocene records of sea surface and bottom water temperatures, freshening and sea ice cover on the Labrador Shelf during the last 6,000 years. Our records reveal that the LC underwent three major oceanographic phases from the Mid- to Late Holocene. From 6.2 to 5.6 ka BP, the LC experienced a cold episode that was followed by warmer conditions between 5.6 and 2.1 ka BP, possibly associated with the late Holocene Thermal Maximum. Although surface waters on the Labrador Shelf cooled gradually after 3 ka BP in response to the Neoglaciation, Labrador Shelf subsurface/bottom waters show a shift to warmer temperatures after 2.1 ka BP. Although such an inverse stratification by cooling of surface and warming of subsurface waters on the Labrador Shelf would suggest a diminished convection during the last two millennia compared to the mid-Holocene, it remains difficult to assess whether hydrographic conditions in the LC have had a significant impact on Labrador Sea deep-water formation.
    Keywords: 031-1; Alkenones; GC; Gravity corer; Labrador Sea; Maria S. Merian; Mg/Ca paleothermometry; MSM45; MSM45_431-1; Stable isotopes
    Type: Dataset
    Format: application/zip, 3 datasets
    Location Call Number Limitation Availability
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