Physics – Geophysics
Scientific paper
2008-03-31
Geophys. Res. Lett., 35, L06703, 2008
Physics
Geophysics
Scientific paper
10.1029/2008GL033414
North Atlantic climate during glacial times was characterized by large-amplitude switchings, the Dansgaard-Oeschger (DO) events, with an apparent tendency to recur preferably in multiples of about 1470 years. Recent work interpreted these intervals as resulting from a subharmonic response of a highly nonlinear system to quasi-periodic solar forcing plus noise. This hypothesis was challenged as inconsistent with the observed variability in the phase relation between proxies of solar activity and Greenland climate. Here we reject the claim of inconsistency by showing that this phase variability is a robust, generic feature of the nonlinear dynamics of DO events, as described by a model. This variability is expected from the fact that the events are threshold crossing events, resulting from a cooperative process between the periodic forcing and the noise. This process produces a fluctuating phase relation with the periodic forcing, consistent with proxies of solar activity and Greenland climate.
Braun Harald
Chialvo Dante R.
Ditlevsen Peter
No associations
LandOfFree
Solar forced Dansgaard-Oeschger events and their phase relation with solar proxies does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Solar forced Dansgaard-Oeschger events and their phase relation with solar proxies, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Solar forced Dansgaard-Oeschger events and their phase relation with solar proxies will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-197471