Barnet, James S K (2020): Stable isotope and trace element ratios of bulk sediment and planktic foraminifera in ODP Hole 121-758A and IODP Hole 353-U1443A [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.910789
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Abstract:
The early Paleogene represents the most recent interval in Earth's history characterized by global greenhouse warmth on multi-million year timescales, yet our understanding of long-term climate and carbon cycle evolution in the low latitudes, and in particular the Indian Ocean, remains very poorly constrained. Here we present the first long-term sub-eccentricity-resolution stable isotope (δ13C and δ18O) and trace element (Mg/Ca and B/Ca) records spanning the late Paleocene–early Eocene (~58–53 Ma) from a surface–deep transect of the northern Indian Ocean, resolving late Paleocene 405-kyr paced cyclicity and a portion of the PETM recovery. Our new records reveal a long-term warming of ~4–5°C at all depths in the water column, with absolute surface ocean temperatures and magnitudes of warming comparable to the low latitude Atlantic and Pacific. As a result of warming, we observe a long-term increase in δ18Osw of the mixed layer, implying an increase in net evaporation. We also observe a collapse in the temperature gradient between mixed layer- and thermocline-dwelling species, potentially due to either the development of a more homogeneous water column with a thicker mixed layer, or depth migration of the Morozovella in response to warming. Synchronous warming at both low and high latitudes, along with decreasing B/Ca ratios in planktic foraminifera implying falling ocean pH and/or increasing dissolved inorganic carbon, suggest that global climate was forced by rising atmospheric CO2 concentrations during this time.
Supplement to:
Barnet, James S K; Harper, Dustin T; LeVay, Leah J; Edgar, Kirsty M; Henehan, Michael J; Babila, Tali L; Ullmann, Clemens V; Leng, Melanie J; Kroon, Dick; Zachos, James C; Littler, Kate (2020): Coupled evolution of temperature and carbonate chemistry during the Paleocene–Eocene; new trace element records from the low latitude Indian Ocean. Earth and Planetary Science Letters, 545, 116414, https://doi.org/10.1016/j.epsl.2020.116414
Project(s):
Coverage:
Median Latitude: 5.383845 * Median Longitude: 90.361515 * South-bound Latitude: 5.383490 * West-bound Longitude: 90.361200 * North-bound Latitude: 5.384200 * East-bound Longitude: 90.361830
Date/Time Start: 1988-06-15T23:50:00 * Date/Time End: 1988-06-24T13:30:00
License:
Creative Commons Attribution 4.0 International (CC-BY-4.0)
Size:
6 datasets
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Datasets listed in this publication series
- Barnet, JSK (2020): Bulk sediment stable carbon and oxygen isotope records of ODP Hole 121-758A. https://doi.org/10.1594/PANGAEA.910783
- Barnet, JSK (2020): Planktic foraminifera stable carbon and oxygen isotope records of ODP Hole 121-758A. https://doi.org/10.1594/PANGAEA.910785
- Barnet, JSK (2020): Planktic foraminifera trace element ratios of ODP Hole 121-758A. https://doi.org/10.1594/PANGAEA.910787
- Barnet, JSK (2020): Bulk sediment stable carbon and oxygen isotope records of IODP Hole 353-U1443A. https://doi.org/10.1594/PANGAEA.910784
- Barnet, JSK (2020): Planktic foraminifera stable carbon and oxygen isotope records of IODP Hole 353-U1443A. https://doi.org/10.1594/PANGAEA.910786
- Barnet, JSK (2020): Planktic foraminifera trace element ratios of IODP Hole 353-U1443A. https://doi.org/10.1594/PANGAEA.910788