Amplification of Holocene multicentennial climate forcing by mode transitions in North Atlantic overturning circulation

Details Amplification of Holocene multicentennial climate forcing by mode transitions in North Atlantic overturning circulation Amplification of Holocene multicentennial climate forcing by mode transitions in North Atlantic overturning circulation

Aug 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007georl..3415706j&link_type=abstract

Geophysical Research Letters, Volume 34, Issue 15, CiteID L15706

Physics

10

Global Change: Abrupt/Rapid Climate Change (4901, 8408), Global Change: Climate Variability (1635, 3305, 3309, 4215, 4513), Global Change: Climate Dynamics (0429, 3309), Global Change: Global Climate Models (3337, 4928), Global Change: Solar Variability (7537)

Scientific paper

Using a three-dimensional global climate model, we show that mode-transitions in North Atlantic deep-water production can provide an amplifying mechanism of relatively weak climate perturbations during the Holocene. Under pre-industrial boundary conditions, a freshwater forcing in the Labrador Sea pushes the North Atlantic overturning circulation into a deterministically bistable regime, characterized by stochastic ``on'' and ``off'' switches in Labrador Sea convection. On a multicentennial time-scale these stochastic mode-transitions can be phase-locked by a small (subthreshold) periodic freshwater forcing. The local small periodic forcing is effectively amplified with the assistance of noise, to have a large-scale impact on North Atlantic overturning circulation and climate. These results suggest a stochastic resonance mechanism that can operate under Holocene boundary conditions and indicate that changes in the three-dimensional configuration of North Atlantic deep-water formation can be an important component of multicentennial climate variability during interglacials.

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