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Title: Deglacial Tropical Atlantic subsurface warming links ocean circulation variability to the West African Monsoon

Abstract

Multiple lines of evidence show that cold stadials in the North Atlantic were accompanied by both reductions in Atlantic Meridional Overturning Circulation (AMOC) and collapses of the West African Monsoon (WAM). Although records of terrestrial change identify abrupt WAM variability across the deglaciation, few studies show how ocean temperatures evolved across the deglaciation. To identify the mechanism linking AMOC to the WAM, we generated a new record of subsurface temperature variability over the last 21 kyr based on Mg/Ca ratios in a sub-thermocline dwelling planktonic foraminifera in an Eastern Equatorial Atlantic (EEA) sediment core from the Niger Delta. Our subsurface temperature record shows abrupt subsurface warming during both the Younger Dryas (YD) and Heinrich Event 1. We also conducted a new transient coupled ocean-atmosphere model simulation across the YD that better resolves the western boundary current dynamics and find a strong negative correlation between AMOC strength and EEA subsurface temperatures caused by changes in ocean circulation and rainfall responses that are consistent with the observed WAM change. Our combined proxy and modeling results provide the first evidence that an oceanic teleconnection between AMOC strength and subsurface temperature in the EEA impacted the intensity of the WAM on millennial time scales.

Authors:
 [1];  [2];  [2];  [2];  [3]
  1. Old Dominion Univ., Norfolk, VA (United States)
  2. Texas A & M Univ., College Station, TX (United States)
  3. Univ. of Wisconsin, Madison, WI (United States); Oregon State Univ., Corvallis, OR (United States)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Oak Ridge Leadership Computing Facility (OLCF)
Sponsoring Org.:
USDOE Office of Science (SC); National Science Foundation (NSF)
OSTI Identifier:
1565678
Grant/Contract Number:  
[AC05-00OR22725]
Resource Type:
Accepted Manuscript
Journal Name:
Scientific Reports
Additional Journal Information:
[ Journal Volume: 7; Journal Issue: 1]; Journal ID: ISSN 2045-2322
Publisher:
Nature Publishing Group
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES

Citation Formats

Schmidt, Matthew W., Chang, Ping, Parker, Andrew O., Ji, Link, and He, Feng. Deglacial Tropical Atlantic subsurface warming links ocean circulation variability to the West African Monsoon. United States: N. p., 2017. Web. doi:10.1038/s41598-017-15637-6.
Schmidt, Matthew W., Chang, Ping, Parker, Andrew O., Ji, Link, & He, Feng. Deglacial Tropical Atlantic subsurface warming links ocean circulation variability to the West African Monsoon. United States. doi:10.1038/s41598-017-15637-6.
Schmidt, Matthew W., Chang, Ping, Parker, Andrew O., Ji, Link, and He, Feng. Mon . "Deglacial Tropical Atlantic subsurface warming links ocean circulation variability to the West African Monsoon". United States. doi:10.1038/s41598-017-15637-6. https://www.osti.gov/servlets/purl/1565678.
@article{osti_1565678,
title = {Deglacial Tropical Atlantic subsurface warming links ocean circulation variability to the West African Monsoon},
author = {Schmidt, Matthew W. and Chang, Ping and Parker, Andrew O. and Ji, Link and He, Feng},
abstractNote = {Multiple lines of evidence show that cold stadials in the North Atlantic were accompanied by both reductions in Atlantic Meridional Overturning Circulation (AMOC) and collapses of the West African Monsoon (WAM). Although records of terrestrial change identify abrupt WAM variability across the deglaciation, few studies show how ocean temperatures evolved across the deglaciation. To identify the mechanism linking AMOC to the WAM, we generated a new record of subsurface temperature variability over the last 21 kyr based on Mg/Ca ratios in a sub-thermocline dwelling planktonic foraminifera in an Eastern Equatorial Atlantic (EEA) sediment core from the Niger Delta. Our subsurface temperature record shows abrupt subsurface warming during both the Younger Dryas (YD) and Heinrich Event 1. We also conducted a new transient coupled ocean-atmosphere model simulation across the YD that better resolves the western boundary current dynamics and find a strong negative correlation between AMOC strength and EEA subsurface temperatures caused by changes in ocean circulation and rainfall responses that are consistent with the observed WAM change. Our combined proxy and modeling results provide the first evidence that an oceanic teleconnection between AMOC strength and subsurface temperature in the EEA impacted the intensity of the WAM on millennial time scales.},
doi = {10.1038/s41598-017-15637-6},
journal = {Scientific Reports},
number = [1],
volume = [7],
place = {United States},
year = {2017},
month = {11}
}

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Works referenced in this record:

Seasonal Evolution and Variability Associated with the West African Monsoon System
journal, September 2004


Evidence for calcification depth change of Globorotalia truncatulinoides between deglaciation and Holocene in the Western Atlantic Ocean
journal, October 2009


On the spreading of South Atlantic Water into the Northern Hemisphere
journal, January 2009

  • Kirchner, Kerstin; Rhein, Monika; Hüttl-Kabus, Sabine
  • Journal of Geophysical Research, Vol. 114, Issue C5
  • DOI: 10.1029/2008jc005165

Planktonic foraminiferal Mg/Ca as a proxy for past oceanic temperatures: a methodological overview and data compilation for the Last Glacial Maximum
journal, April 2005


Global dissolution effects on planktonic foraminiferal Mg/Ca ratios controlled by the calcite-saturation state of bottom waters
journal, March 2014

  • Regenberg, Marcus; Regenberg, Anke; Garbe-Schönberg, Dieter
  • Paleoceanography, Vol. 29, Issue 3
  • DOI: 10.1002/2013PA002492

The variation of discharge entering the Niger Delta system, 1951–2000, and estimates of change under global warming
journal, January 2008

  • Itiveh, Kingsley O.; Bigg, Grant R.
  • International Journal of Climatology, Vol. 28, Issue 5
  • DOI: 10.1002/Joc.1568

Geochemical proxies of North American freshwater routing during the Younger Dryas cold event
journal, April 2007

  • Carlson, A. E.; Clark, P. U.; Haley, B. A.
  • Proceedings of the National Academy of Sciences, Vol. 104, Issue 16
  • DOI: 10.1073/pnas.0611313104

Oceanic link between abrupt changes in the North Atlantic Ocean and the African monsoon
journal, May 2008

  • Chang, Ping; Zhang, Rong; Hazeleger, Wilco
  • Nature Geoscience, Vol. 1, Issue 7
  • DOI: 10.1038/ngeo218

Planktic foraminifers and hydrography of the eastern and northern Caribbean Sea
journal, November 2002


A new perspective on West African hydroclimate during the last deglaciation
journal, September 2016

  • Parker, Andrew O.; Schmidt, Matthew W.; Jobe, Zane R.
  • Earth and Planetary Science Letters, Vol. 449
  • DOI: 10.1016/j.epsl.2016.05.038

Reevaluation of the oxygen isotopic composition of planktonic foraminifera: Experimental results and revised paleotemperature equations
journal, April 1998

  • Bemis, Bryan E.; Spero, Howard J.; Bijma, Jelle
  • Paleoceanography, Vol. 13, Issue 2
  • DOI: 10.1029/98PA00070

The time-transgressive termination of the African Humid Period
journal, January 2015

  • Shanahan, Timothy M.; McKay, Nicholas P.; Hughen, Konrad A.
  • Nature Geoscience, Vol. 8, Issue 2
  • DOI: 10.1038/ngeo2329

Oceanic Forcing of Sahel Rainfall on Interannual to Interdecadal Time Scales
journal, November 2003


Solar forcing of Florida Straits surface salinity during the early Holocene: HOLOCENE TROPICAL HYDROLOGIC CYCLE
journal, July 2012

  • Schmidt, Matthew W.; Weinlein, William A.; Marcantonio, Franco
  • Paleoceanography, Vol. 27, Issue 3
  • DOI: 10.1029/2012pa002284

Atlantic Forcing of Persistent Drought in West Africa
journal, April 2009


Climate and atmospheric history of the past 420,000 years from the Vostok ice core, Antarctica
journal, June 1999

  • Petit, J. R.; Jouzel, J.; Raynaud, D.
  • Nature, Vol. 399, Issue 6735
  • DOI: 10.1038/20859

The magnitude, timing and abruptness of changes in North African dust deposition over the last 20,000yr
journal, June 2013


North Atlantic simulations in Coordinated Ocean-ice Reference Experiments phase II (CORE-II). Part I: Mean states
journal, January 2014


Subtropical cells and meridional overturning circulation pathways in the tropical Atlantic
journal, January 2006

  • Hazeleger, Wilco; Drijfhout, Sybren
  • Journal of Geophysical Research, Vol. 111, Issue C3
  • DOI: 10.1029/2005jc002942

Influence of the Meridional Overturning Circulation on Tropical–Subtropical Pathways
journal, May 2001


Core top calibration of Mg/Ca in tropical foraminifera: Refining paleotemperature estimation: CORE TOP CALIBRATION
journal, April 2002

  • Dekens, Petra S.; Lea, David W.; Pak, Dorothy K.
  • Geochemistry, Geophysics, Geosystems, Vol. 3, Issue 4
  • DOI: 10.1029/2001GC000200

Deep-dwelling foraminifera as thermocline temperature recorders: TEMPERATURE FROM FORAMINIFERA
journal, April 2007

  • Cléroux, Caroline; Cortijo, Elsa; Duplessy, Jean-Claude
  • Geochemistry, Geophysics, Geosystems, Vol. 8, Issue 4
  • DOI: 10.1029/2006gc001474

The influence of salinity on Mg/Ca in planktic foraminifers – Evidence from cultures, core-top sediments and complementary δ18O
journal, November 2013

  • Hönisch, Bärbel; Allen, Katherine A.; Lea, David W.
  • Geochimica et Cosmochimica Acta, Vol. 121
  • DOI: 10.1016/j.gca.2013.07.028

Impact of abrupt deglacial climate change on tropical Atlantic subsurface temperatures
journal, August 2012

  • Schmidt, M. W.; Chang, P.; Hertzberg, J. E.
  • Proceedings of the National Academy of Sciences, Vol. 109, Issue 36
  • DOI: 10.1073/pnas.1207806109

Calibration of Mg/Ca thermometry in planktonic foraminifera from a sediment trap time series: CALIBRATION OF Mg/Ca THERMOMETRY IN PLANKTONIC FORAMINIFERA
journal, June 2003

  • Anand, Pallavi; Elderfield, Henry; Conte, Maureen H.
  • Paleoceanography, Vol. 18, Issue 2
  • DOI: 10.1029/2002PA000846

Refining Globigerinoides ruber Mg/Ca paleothermometry in the Atlantic Ocean
journal, December 2013


Abrupt onset and termination of the African Humid Period:
journal, January 2000


Effects of the Bering Strait closure on AMOC and global climate under different background climates
journal, March 2015


155,000 Years of West African Monsoon and Ocean Thermal Evolution
journal, June 2007


On the fidelity of shell-derived δ18Oseawater estimates
journal, December 2010

  • Arbuszewski, Jennifer; deMenocal, Peter; Kaplan, Alexey
  • Earth and Planetary Science Letters, Vol. 300, Issue 3-4
  • DOI: 10.1016/j.epsl.2010.10.035

The sensitivity of the climate response to the magnitude and location of freshwater forcing: last glacial maximum experiments
journal, January 2010


Evidence from the Florida Straits for Younger Dryas ocean circulation changes
journal, January 2011

  • Lynch-Stieglitz, Jean; Schmidt, Matthew W.; Curry, William B.
  • Paleoceanography, Vol. 26, Issue 1
  • DOI: 10.1029/2010PA002032

Stable isotopes of planktonic foraminifera from tropical Atlantic/Caribbean core-tops: Implications for reconstructing upper ocean stratification
journal, April 2009


Transient Simulation of Last Deglaciation with a New Mechanism for Bolling-Allerod Warming
journal, July 2009


Establishment of Deep Ocean Circulation Driven by Deep-Water Production
journal, December 1987


Orbital and millennial-scale features of atmospheric CH4 over the past 800,000 years
journal, May 2008

  • Loulergue, Laetitia; Schilt, Adrian; Spahni, Renato
  • Nature, Vol. 453, Issue 7193
  • DOI: 10.1038/nature06950

Collapse and rapid resumption of Atlantic meridional circulation linked to deglacial climate changes
journal, April 2004

  • McManus, J. F.; Francois, R.; Gherardi, J. -M.
  • Nature, Vol. 428, Issue 6985
  • DOI: 10.1038/nature02494

Low-Latitude Circulation and Mass Transport Pathways in a Model of the Tropical Atlantic Ocean*
journal, August 2000


    Works referencing / citing this record:

    Deglacial Heat Uptake by the Southern Ocean and Rapid Northward Redistribution Via Antarctic Intermediate Water
    journal, November 2018

    • Poggemann, D. ‐W.; Nürnberg, D.; Hathorne, E. C.
    • Paleoceanography and Paleoclimatology, Vol. 33, Issue 11
    • DOI: 10.1029/2017pa003284

    Southward Displacement of the North Atlantic Subtropical Gyre Circulation System During North Atlantic Cold Spells
    journal, May 2019

    • Reißig, S.; Nürnberg, D.; Bahr, A.
    • Paleoceanography and Paleoclimatology
    • DOI: 10.1029/2018pa003376