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Thomas, Deborah J; Bralower, Timothy J; Zachos, James C (1999): Geochemistry of Late Paleocene thermal maximum sediments [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.856650, Supplement to: Thomas, DJ et al. (1999): New evidence for subtropical warming during the Late Paleocene thermal maximum: Stable isotopes from Deep Sea Drilling Project Site 527, Walvis Ridge. Paleoceanography, 14(5), 561-570, https://doi.org/10.1029/1999PA900031

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Abstract:
The late Paleocene thermal maximum (LPTM) was a dramatic, short-term global warming event that occurred ~55 Ma. Warming of high-latitude surface waters and global deep waters during the LPTM has been well documented; however, current data suggest that subtropical and tropical sea surface temperatures (SSTs) did not change during the event. Conventional paradigms of global climate change, such as CO2-induced greenhouse warming, predict greater warming in the high latitudes than in the tropics or subtropics but, nonetheless, cannot account for the stable tropical/subtropical SSTs. We measured the stable isotope values of well-preserved late Paleocene to early Eocene planktonic foraminifera from South Atlantic Deep Sea Drilling Project (DSDP) Site 527 to evaluate the subtropical response to the climatic and environmental changes of the LPTM. Planktonic foraminiferal d18O values at Site 527 decrease by ~0.94 per mil from pre-LPTM to excursion values, providing the first evidence for subtropical warming during the LPTM. We estimate that subtropical South Atlantic SSTs warmed by at least ~1°-4°C, on the basis of possible changes in evaporation and precipitation. The new evidence for subtropical SST warming supports a greenhouse mechanism for global warming involving elevated atmospheric CO2 levels.
Project(s):
Deep Sea Drilling Project (DSDP)
Ocean Drilling Program (ODP)
Coverage:
Median Latitude: -30.132971 * Median Longitude: -41.318217 * South-bound Latitude: -65.161000 * West-bound Longitude: -179.555000 * North-bound Latitude: 18.440400 * East-bound Longitude: 1.763300
Date/Time Start: 1980-06-28T00:00:00 * Date/Time End: 1996-02-12T19:30:00
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
4 datasets

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Datasets listed in this publication series

  1. Thomas, DJ; Bralower, TJ; Zachos, JC (1999): (Table 2) Carbonate content and stable isotopic composition of planktonic foraminifera of DSDP Hole 74-527. https://doi.org/10.1594/PANGAEA.856646
  2. Thomas, DJ; Bralower, TJ; Zachos, JC (1999): (Table 4) CaCO3 content of LPTM sediments of ODP HOle 113-690B. https://doi.org/10.1594/PANGAEA.856649
  3. Thomas, DJ; Bralower, TJ; Zachos, JC (1999): (Table 3) Biostratigraphic and chemostratigraphic datums of LPTM sediments. https://doi.org/10.1594/PANGAEA.856647
  4. Thomas, DJ; Bralower, TJ; Zachos, JC (1999): (Table 4) Planktonic foraminiferal Sr/Ca ratios of LPTM sediments. https://doi.org/10.1594/PANGAEA.856648