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  • AWI_Paleo; Paleoenvironmental Reconstructions from Marine Sediments @ AWI  (2)
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  • 1
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    Unknown
    Bulk properties and isotopic data of sediment cores from the Bounty Trough and Tasman Sea off New Zealand
    PANGAEA
    In:  Supplement to: Ronge, Thomas A; Steph, Silke; Tiedemann, Ralf; Prange, Matthias; Merkel, Ute; Nürnberg, Dirk; Kuhn, Gerhard (2015): Pushing the boundaries: Glacial/interglacial variability of intermediate and deep waters in the southwest Pacific over the last 350,000 years. Paleoceanography, 30(2), 23-38, https://doi.org/10.1002/2014PA002727
    Details
    Publication Date: 2023-05-12
    Description: Glacial/interglacial changes in Southern Ocean's air-sea gas exchange have been considered as important mechanisms contributing to the glacial/interglacial variability in atmospheric CO2. Hence, understanding past variability in Southern Ocean intermediate- to deep-water chemistry and circulation is fundamental to constrain the role of these processes on modulating glacial/interglacial changes in the global carbon cycle. Our study focused on the glacial/interglacial variability in the vertical extent of southwest Pacific Antarctic Intermediate Water (AAIW). We compared carbon and oxygen isotope records from epibenthic foraminifera of sediment cores bathed in modern AAIW and Upper Circumpolar Deep Water (UCDW; 943 - 2066 m water depth) to monitor changes in water mass circulation spanning the past 350,000 years. We propose that pronounced freshwater input by melting sea ice into the glacial AAIW significantly hampered the downward expansion of southwest Pacific AAIW, consistent with climate model results for the Last Glacial Maximum. This process led to a pronounced upward displacement of the AAIW-UCDW interface during colder climate conditions and therefore to an expansion of the glacial carbon pool.
    Keywords: AWI_Paleo; Paleoenvironmental Reconstructions from Marine Sediments @ AWI
    Type: Dataset
    Format: application/zip, 9 datasets
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    DATA PANGAEA
  • 2
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    Age determination of seven sediment cores from the South Pacific Ocean (2016)
    PANGAEA
    In:  Supplement to: Ronge, Thomas A; Tiedemann, Ralf; Lamy, Frank; Köhler, Peter; Alloway, Brent V; De Pol-Holz, Ricardo; Pahnke, Katharina; Southon, John; Wacker, Lukas (2016): Radiocarbon constraints on the extent and evolution of the South Pacific carbon pool. Nature Communications, 7, 12 pp, https://doi.org/10.1038/ncomms11487
    Details
    Publication Date: 2024-04-20
    Description: During the last deglaciation, the opposing patterns of atmospheric CO2 and radiocarbon activities (D14C) suggest the release of 14C-depleted CO2 from old carbon reservoirs. Although evidences point to the deep Pacific as a major reservoir of this 14C-depleted carbon, its extent and evolution still need to be constrained. Here we use sediment cores retrieved along a South Pacific transect to reconstruct the spatio-temporal evolution of D14C over the last 30,000 years. In ~2,500-3,600 m water depth, we find 14C-depleted deep waters with a maximum glacial offset to atmospheric 14C (DD14C = -1,000 per mil). Using a box model, we test the hypothesis that these low values might have been caused by an interaction of aging and hydrothermal CO2 influx. We observe a rejuvenation of circumpolar deep waters synchronous and potentially contributing to the initial deglacial rise in atmospheric CO2. These findings constrain parts of the glacial carbon pool to the deep South Pacific.
    Keywords: AWI_Paleo; Paleoenvironmental Reconstructions from Marine Sediments @ AWI
    Type: Dataset
    Format: application/zip, 25 datasets
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    DATA PANGAEA
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