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Geophysical Monograph Series

 

Keywords

  • Atlantic meridional overturning circulation
  • recovery
  • last deglaciation
  • two stages
  • overshoot

Index Terms

  • 4901 Paleoceanography: Abrupt/rapid climate change
  • 4962 Paleoceanography: Thermohaline
  • 4255 Oceanography: General: Numerical modeling
  • 0910 Exploration Geophysics: Data processing

Article

GEOPHYSICAL MONOGRAPH SERIES, VOL. 193, PP. 75-92, 2011

Simulated Two-Stage Recovery of Atlantic Meridional Overturning Circulation During the Last Deglaciation

Jun Cheng

Key Laboratory of Meteorological Disaster of Ministry of Education and College of Atmospheric Sciences, Nanjing University of Information Science and Technology, Nanjing, China


Zhengyu Liu


Feng He

Center for Climatic Research and Department of Atmospheric and Oceanic Sciences, University of Wisconsin-Madison, Madison, Wisconsin, USA


Bette L. Otto-Bliesner

Climate and Global Dynamics Division, National Center for Atmospheric Research, Boulder, Colorado, USA


Esther C. Brady

Climate and Global Dynamics Division, National Center for Atmospheric Research, Boulder, Colorado, USA


Mark Wehrenberg

Center for Climatic Research and Department of Atmospheric and Oceanic Sciences, University of Wisconsin-Madison, Madison, Wisconsin, USA


A two-stage recovery of Atlantic meridional overturning circulation (AMOC) during Bølling Allerød (BA) is revealed in the first transient simulation of last deglaciation in a fully coupled general circulation model (Transient Simulation of Climate Evolution over the Last 21,000 Years (TraCE-21000)). After being suppressed during the Heinrich 1 event, North Atlantic Deep Water (NADW) formation first reinitiates in the Labrador Sea in stage 1 and then reinitiates in the Greenland-Iceland-Norwegian (GIN) seas in stage 2. This feature is derived from the investigation of NADW formation in its two origins with a newly developed method and is confirmed by the comprehensive analysis of relative variables. A new mechanism is proposed to interpret the northward asynchronous reinitiation of NADW during BA. In addition, our work also points out that the generation of the AMOC overshoot is associated with the reinitiation of NADW in GIN seas.

Citation: Cheng, J., Z. Liu, F. He, B. L. Otto-Bliesner, E. C. Brady, and M. Wehrenberg (2011), Simulated two-stage recovery of Atlantic meridional overturning circulation during the last deglaciation, in Abrupt Climate Change: Mechanisms, Patterns, and Impacts, Geophys. Monogr. Ser., vol. 193, edited by H. Rashid, L. Polyak and E. Mosley-Thompson, pp. 75–92, AGU, Washington, D. C., doi:10.1029/2010GM001014.

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