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Waddell, Lindsey M; Hendy, Ingrid L; Moore, Theodore C; Lyle, Mitchell W (2009): Stable isotope record and sediment composition of the subantarctic Pacific [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.831703, Supplement to: Waddell, LM et al. (2009): Ventilation of the abyssal Southern Ocean during the late Neogene: A new perspective from the subantarctic Pacific. Paleoceanography, 24(3), PA3206, https://doi.org/10.1029/2008PA001661

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Published: 2009 (exact date unknown) • DOI registered: 2014-05-09

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Abstract:
Benthic foraminiferal stable carbon isotope records from the South Atlantic show significant declines toward more "Pacific-like" values at ~7 and ~2.7 Ma, and it has been posited that these shifts may mark steps toward increased CO2 sequestration in the deep Southern Ocean as climate cooled over the late Neogene. We generated new stable isotope records from abyssal subantarctic Pacific cores MV0502-4JC and ELT 25-11. The record from MV0502-4JC suggests that the Southern Ocean remained well mixed and free of vertical or interbasinal d13C gradients following the late Miocene carbon shift (LMCS). According to the records from MV0502-4JC and ELT 25-11, however, cold, low d13C bottom waters developed in the Southern Ocean in the late Pliocene and persisted until ~1.7 Ma. These new data suggest that while conditions in the abyssal Southern Ocean following the LMCS were comparable to the present day, sequestration of respired CO2 may have increased in the deepest parts of the Southern Ocean during the late Pliocene, a critical period for the growth and establishment of the Northern Hemisphere ice sheets.
Coverage:
Median Latitude: -50.183150 * Median Longitude: -169.691850 * South-bound Latitude: -50.333300 * West-bound Longitude: 148.133300 * North-bound Latitude: -50.033000 * East-bound Longitude: -127.517000
Date/Time Start: 1966-01-01T00:00:00 * Date/Time End: 1966-01-01T00:00:00
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
6 datasets

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Datasets listed in this publication series

  1. Waddell, LM; Hendy, IL; Moore, TC et al. (2009): (Table 3) Important age datums identified in sediment core ELT25.011-CP. https://doi.org/10.1594/PANGAEA.831702
  2. Waddell, LM; Hendy, IL; Moore, TC et al. (2009): (Table S4) CaCO3 content in sediment core ELT25.011-CP. https://doi.org/10.1594/PANGAEA.831700
  3. Waddell, LM; Hendy, IL; Moore, TC et al. (2009): (Table S3) Stable isotope ratios, and sand content in sediment core ELT25.011-CP. https://doi.org/10.1594/PANGAEA.831698
  4. Waddell, LM; Hendy, IL; Moore, TC et al. (2009): (Table 2) Important age datums identified in sediment core MV0502-4JC. https://doi.org/10.1594/PANGAEA.831701
  5. Waddell, LM; Hendy, IL; Moore, TC et al. (2009): (Table S2) CaCO3 content in sediment core MV0502-4JC. https://doi.org/10.1594/PANGAEA.831699
  6. Waddell, LM; Hendy, IL; Moore, TC et al. (2009): (Table S1) Stable isotope ratios, sand content, and IRD in sediment core MV0502-4JC. https://doi.org/10.1594/PANGAEA.831697