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Generated using V3.0 of the official AMS LATEX templatejournal page layout FOR AUTHOR USE ONLY, NOT FOR SUBMISSION!
 

Summary: Generated using V3.0 of the official AMS LATEX template­journal page layout FOR AUTHOR USE ONLY, NOT FOR
SUBMISSION!
Abrupt millennial variability and interdecadal-interstadial oscillations in a global coupled
model: sensitivity to the background climate state
Olivier Arzel 1
and Matthew H. England
The University of New South Wales, Climate Change Research Centre (CCRC), Sydney, Australia.
Alain Colin de Verdi`ere and Thierry Huck
Universit´e de Bretagne Occidentale, Laboratoire de Physique des Oc´eans (LPO), Brest, France.
Abstract
The origin and bifurcation structure of abrupt millennial-scale climate transitions under
steady external solar forcing and in the absence of atmospheric synoptic variability is
studied by means of a global coupled model of intermediate complexity. We show that
the origin of Dansgaard-Oeschger (DO) type oscillations in the model is caused by the
weaker northward oceanic heat transport in the Atlantic basin. This is in agreement with
previous studies realized with much simpler models, based on highly idealized geometries
and simplified physics. The existence of abrupt millennial-scale climate transitions during
glacial times can therefore be interpreted as a consequence of the weakening of the
negative temperature-advection feedback. This is confirmed through a series of numerical
experiments designed to explore the sensitivity of the bifurcation structure of the Atlantic

  

Source: Arzel, Olivier - Climate Change Research Centre, University of New South Wales

 

Collections: Geosciences