English
 
User Manual Privacy Policy Disclaimer Contact us
  Advanced SearchBrowse

Item

ITEM ACTIONSEXPORT
 
 
DownloadE-Mail
  Active Pacific meridional overturning circulation (PMOC) during the warm Pliocene

Burls, N. J., Fedorov, A. V., Sigman, D. M., Jaccard, S. L., Tiedemann, R., & Haug, G. H. (2017). Active Pacific meridional overturning circulation (PMOC) during the warm Pliocene. Science Advances, 3(9): e1700156. doi:10.1126/sciadv.1700156.

Item is

Basic

show hide
Item Permalink: http://hdl.handle.net/11858/00-001M-0000-002E-0323-0 Version Permalink: http://hdl.handle.net/11858/00-001M-0000-002E-0324-E
Genre: Journal Article

Files

show Files

Locators

show

Creators

show
hide
 Creators:
Burls, Natalie J., Author
Fedorov, Alexey V., Author
Sigman, Daniel M., Author
Jaccard, Samuel L., Author
Tiedemann, Ralf, Author
Haug, Gerald H.1, Author              
Affiliations:
1Climate Geochemistry, Max Planck Institute for Chemistry, Max Planck Society, ou_2237635              

Content

show
hide
Free keywords: -
 Abstract: 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, the world’s largest ocean, where relatively fresh surface waters inhibit North 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. Redox-sensitive 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.

Details

show
hide
Language(s):
 Dates: 2017-09-13
 Publication Status: Published online
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Method: -
 Identifiers: DOI: 10.1126/sciadv.1700156
 Degree: -

Event

show

Legal Case

show

Project information

show

Source 1

show
hide
Title: Science Advances
  Other : Sci. Adv.
Source Genre: Journal
 Creator(s):
Affiliations:
Publ. Info: Washington : AAAS
Pages: - Volume / Issue: 3 (9) Sequence Number: e1700156 Start / End Page: - Identifier: Other: 2375-2548
CoNE: /journals/resource/2375-2548