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Lear, Caroline H; Rosenthal, Yair; Wright, James D (2020): Atlantic and Pacific benthic Mg/Ca temperatures 0-12 Ma [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.913906

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Abstract:
The Late Neogene witnessed various major paleoceanographic changes that culminated in intense Northern Hemisphere Glaciation (NHG). The cause and effects of these changes are still debated. We use a multiproxy approach to determine the relative timing of the closure of the Panama gateway, changes in Atlantic circulation, global cooling and ice sheet growth. Benthic foraminiferal Mg/Ca records from a Pacific and an Atlantic Site have been produced and are interpreted in terms of bottom water temperatures. These Mg-temperature records are combined with published benthic d13C, N18O and erosion records to reconstruct the flow of proto-North Atlantic Deep Water (proto-NADW) over the past 12 Ma. The results suggest that between 12.5and 10.5 Ma, and again between about 8.5 and 6 Ma, a nutrient-depleted water mass that was colder (by 1-2˚C) and fresher than the intervening deep water mass filled the Atlantic basin. This proto-NADW became warmer (by ~1˚C) and saltier between 6 and 5Ma, coincident with the restriction of surface water flow through the Central American Seaway. The Mg-temperature records define a subsequent global cooling trend of~3.5˚C between 5 Ma and today. Early NHG in the late Miocene was perhaps related to the formation of the relatively cold, fresh proto-NADW. The formation of the warmer and saltier proto-NADW in the early Pliocene may have initially limited Northern Hemisphere ice growth. However, the increased moisture released at high northern latitudes associated with formation of 'warm' proto-NADW, coupled with the global temperature decrease of deep (and hence polar surface) waters, likely helped initiate the intense NHG of the Plio-Pleistocene.
Keyword(s):
Benthic foraminifera; Mg/Ca; North Atlantic Deep Water; ocean drilling program; ocean gateway
Supplement to:
Lear, Caroline H; Rosenthal, Yair; Wright, James D (2003): The closing of a seaway: ocean water masses and global climate change. Earth and Planetary Science Letters, 210(3-4), 425-436, https://doi.org/10.1016/S0012-821X(03)00164-X
Related to:
Bickert, Torsten; Berger, Wolfgang H; Burke, S; Schmidt, Heike; Wefer, Gerold (1993): Late Quaternary stable isotope record of benthic foraminifers: Site 805 and 806, Ontong Java Plateau. In: Berger, WH; Kroenke, LW; Mayer, LA; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 130, 411-420, https://doi.org/10.2973/odp.proc.sr.130.025.1993
Shackleton, Nicholas J; Hall, Michael A (1997): The Late Miocene stable isotope record, Site 926. In: Shackleton, N.J., Curry, W.B., Richter, C., and Bralower, T.J. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 154, 367-373, https://doi.org/10.2973/odp.proc.sr.154.119.1997
Project(s):
Ocean Drilling Program (ODP)
Coverage:
Median Latitude: 2.018821 * Median Longitude: -121.773650 * South-bound Latitude: 0.318500 * West-bound Longitude: 159.361000 * North-bound Latitude: 3.719017 * East-bound Longitude: -42.908300
Date/Time Start: 1990-02-17T00:00:00 * Date/Time End: 1994-02-27T00:00:00
License:
Creative Commons Attribution 4.0 International (CC-BY-4.0)
Size:
8 datasets

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Datasets listed in this publication series

  1. Lear, CH; Rosenthal, Y; Wright, JD (2020): Compiled Bottom Water Temperatures of ODP Site 130-806. https://doi.org/10.1594/PANGAEA.913894
  2. Lear, CH; Rosenthal, Y; Wright, JD (2020): Smoothed Bottom Water Temperatures of ODP Site 130-806. https://doi.org/10.1594/PANGAEA.913895
  3. Lear, CH; Rosenthal, Y; Wright, JD (2020): Species-adjusted stable oxygen isotope record of ODP Site 130-806. https://doi.org/10.1594/PANGAEA.913900
  4. Lear, CH; Rosenthal, Y; Wright, JD (2020): Mg-Ca ratios of benthic foraminifera and BWT reconstruction for ODP Site 130-806B. https://doi.org/10.1594/PANGAEA.913903
  5. Lear, CH; Rosenthal, Y; Wright, JD (2020): Compiled Bottom Water Temperatures of ODP Site 154-926. https://doi.org/10.1594/PANGAEA.913896
  6. Lear, CH; Rosenthal, Y; Wright, JD (2020): Smoothed Bottom Water Temperatures of ODP Site 154-926. https://doi.org/10.1594/PANGAEA.913898
  7. Lear, CH; Rosenthal, Y; Wright, JD (2020): Species-adjusted stable oxygen isotope record of ODP Site 154-926. https://doi.org/10.1594/PANGAEA.913901
  8. Lear, CH; Rosenthal, Y; Wright, JD (2020): Mg-Ca ratios of benthic foraminifera and BWT reconstruction for ODP Site 154-926. https://doi.org/10.1594/PANGAEA.913905