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Freshwater pulse experiments The experiments in Fig. 4a simulate deglacial meltwater discharge to the Atlantic Ocean
 

Summary: Freshwater pulse experiments
The experiments in Fig. 4a simulate deglacial meltwater discharge to the Atlantic Ocean
between 208N and 508N. Experiment LGM_CTRL_H500 and LGM_SH_H500 display the
model response to a 500-year freshwater-pulse of 0.15 Sv. The starting point of experiment
LGM_SH_Hperm, representing the THC `off-mode', results from a permanent freshwater
flow of 0.15 Sv to the glacial equilibrium state. The freshwater flow persists during this
experiment. In LGM_SH_H500 and LGM_SH_Hperm, Southern Hemisphere warming is
executed as in LGM_100, while the glacial background conditions in experiment
LGM_CTRL_H500 remain unaltered.
Stability analysis
We apply a slowly varying freshwater anomaly with a rate of 5 £ 1025
Sv yr21
(1 £ 1026
Sv yr21
at the transition of the hysteresis curve that starts from LGM_100)
uniformly between 208 N and 508 N to the Atlantic Ocean. Integration starts at the upper
branches with zero freshwater forcing, which is then increased up to 0.2 Sv and 0.32 Sv for
LGM_CTRL and LGM_100, respectively. The integration proceeds on the lower branch
with freshwater input decreasing until 20.12 Sv. Then the freshwater increases again to
close the loops. Owing to the slowly varying nature of the surface forcing the model is in

  

Source: Alfè, Dario - Departments of Earth Sciences & Physics and Astronomy, University College London

 

Collections: Physics; Geosciences