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Title: Active Pacific meridional overturning circulation (PMOC) during the warm Pliocene

Journal Article · · Science Advances
ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [3]; ORCiD logo [4]; ORCiD logo [5];  [6]
  1. George Mason Univ., Fairfax, VA (United States). Center for Ocean-Land-Atmosphere Studies, Department of Atmospheric, Oceanic, and Earth Sciences; Yale Univ., New Haven, CT (United States). Department of Geology and Geophysics
  2. Yale Univ., New Haven, CT (United States). Department of Geology and Geophysics
  3. Princeton Univ., NJ (United States). Department of Geosciences
  4. University of Bern (Switzerland). Institute of Geological Sciences and Oeschger Center for Climate Change Research
  5. Alfred Wegener Institute, Bremerhaven (Germany)
  6. Max-Planck Institute for Chemistry, Mainz (Germany); ETH Zurich (Switzerland). Geological Institute, Department of Earth Science

An essential element of modern ocean circulation and climate is the Atlantic meridional overturning circulation (AMOC), which includes deep-water formation in the subarctic North Atlantic. However, a comparable overturning circulation is absent in the Pacific, theworld’s largest ocean,where relatively fresh surface waters inhibitNorth Pacific deep convection. We present complementary measurement and modeling evidence that the warm, ~400–ppmv (parts per million by volume) CO2 world of the Pliocene supported subarctic North Pacific deep-water formation and a Pacific meridional overturning circulation (PMOC) cell. In Pliocene subarctic North Pacific sediments, we report orbitally paced maxima in calcium carbonate accumulation rate, with accompanying pigment and total organic carbon measurements supporting deep-ocean ventilation-driven preservation as their cause. Together with high accumulation rates of biogenic opal, these findings require vigorous bidirectional communication between surface waters and interior waters down to ~3 km in the western subarctic North Pacific, implying deep convection. Redoxsensitive trace metal data provide further evidence of higher Pliocene deep-ocean ventilation before the 2.73-Ma (million years) transition. This observational analysis is supported by climate modeling results, demonstrating that atmospheric moisture transport changes, in response to the reduced meridional sea surface temperature gradients of the Pliocene, were capable of eroding the halocline, leading to deep-water formation in the western subarctic Pacific and a strong PMOC. This second Northern Hemisphere overturning cell has important implications for heat transport, the ocean/atmosphere cycle of carbon, and potentially the equilibrium response of the Pacific to global warming.

Research Organization:
George Mason Univ., Fairfax, VA (United States)
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
SC0016538
OSTI ID:
1429322
Journal Information:
Science Advances, Vol. 3, Issue 9; ISSN 2375-2548
Publisher:
AAASCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 45 works
Citation information provided by
Web of Science

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Cited By (9)

Theories for Past and Future Monsoon Rainfall Changes journal June 2019
Influence of Model Bias on Simulating North Atlantic Sea Surface Temperature During the Mid-Pliocene journal August 2018
Contributions of aerosol‐cloud interactions to mid‐Piacenzian seasonally sea ice‐free Arctic Ocean journal August 2019
Stability of the Atlantic Meridional Overturning Circulation: A Review and Synthesis journal August 2019
Multiproxy Reduced‐Dimension Reconstruction of Pliocene Equatorial Pacific Sea Surface Temperatures journal January 2020
Plio‐Pleistocene Variability of the East Pacific Thermocline and Atmospheric Systems journal January 2020
Pliocene integrated chronostratigraphy from the Anno Formation, Awa Group, Boso Peninsula, central Japan, and its paleoceanographic implications journal January 2019
The HadCM3 contribution to PlioMIP phase 2 journal January 2019
Modeling a modern-like pCO2 warm period (Marine Isotope Stage KM5c) with two versions of an Institut Pierre Simon Laplace atmosphere–ocean coupled general circulation model journal January 2020

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