Geophysikalisches Kolloquium: North Atlantic Multidecadal Variability: a synthesis view

A dynamical systems framework, in many ways similar to that for El Nino/Southern Oscillation, is presented to unterstand the multidecadal varability in the North Atlantic. A so-called minimal primitive equation model is forst used to represent the multidecadal variability in the North Atlantic climate system. Within this minimal model, we identify a normal mode of multidecadas variability tha can destabilize the background climate state throught a so-called Hopf bifurcation. Next, it is argued that noise is setting the amplitude of the sea surface temperature variability associated with this normal mode. Finally, it will  argued that the machanism found in the minimal model is responsible for the multidecadal variability in GCMs and in available observations. 

Date

02.02.2012

Time

15:15 h

Place

Bundesstr. 53, room 022/023
Seminar Room 022/023, Ground Floor, Bundesstrasse 53, 20146 Hamburg, Hamburg

Speaker

Henk Dijkstra, Institute for Marine and Atmospheric Research Utrecht (IMAU), Department of Physics and Astronomy, Utrecht University

Organizers

Martin Claussen
Victor Brovkin

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