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Title: The impacts of deglacial meltwater forcing on the South Atlantic Ocean deep circulation since the Last Glacial Maximum

Journal Article · · Climate of the Past (Online)
 [1];  [1];  [2];  [3]
  1. Univ. of Sao Paulo (Brazil). Inst. of Oceanography
  2. Federal Univ. of Rio Grande do Sul, Rio Grande (Brazil). Inst. of Oceanography
  3. Univ. of Wisconsin, Madison, WI (United States). Dept. of Atmospheric and Oceanic Sciences, Center for Climatic Research

A NCAR-CCSM3 (National Center for Atmospheric Research – Community Climate System Model version 3) state-of-the-art transient paleoclimate simulation with prescribed freshwater inflows is used to investigate the changes and evolution of the South Atlantic water mass structure from the Last Glacial Maximum (LGM) to the present day. Model results show that 21 000 yr ago the water column was substantially stratified due to the presence of a saltier-than-today Antarctic Bottom Water (AABW), forming a salinity barrier that prevented dense waters from the Northern Hemisphere from sinking. This salinity barrier started to erode after the termination of the Heinrich event 1, when its associated meltwater was transported southward, freshening the AABW. The removal of the barrier after 14 ka triggered the production of the North Atlantic Deep Water (NADW), which spread into the deeper layers of the South Atlantic at the onset of the Holocene. At this point, the NADW acquired its modern-day structure, establishing a deeper Atlantic meridional overturning circulation (AMOC).

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Oak Ridge Leadership Computing Facility (OLCF)
Sponsoring Organization:
USDOE Office of Science (SC)
OSTI ID:
1565250
Journal Information:
Climate of the Past (Online), Vol. 10, Issue 5; ISSN 1814-9332
Publisher:
European Geophysical Union - CopernicusCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 10 works
Citation information provided by
Web of Science

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Cited By (1)

Southwest Pacific Vertical Structure Influences on Oceanic Carbon Storage Since the Last Glacial Maximum journal May 2019

Figures / Tables (7)


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