http://en.wikipedia.org/wiki/Dansgaard-Oeschger_event
——————————————————This post is Reblogged from JUDITH CURRY
Explaining? abrupt climate change
http://judithcurry.com/2014/06/04/explaining-abrupt-climate-change
and
Tallbloke has a lively forum going on this as well
http://tallbloke.wordpress.com/2014/06/06/explaining-abrupt-climate-change/The focus is mainly discussion on
Dansgaard-Oeschger events that occurred every 1–2kyr.
(cycles around the 1400-2000 yr) but there is also discussion of other cycle lengths
by Judith Curry
. . . suggesting that Dansgaard-Oeschger events resulted from a combination of the effects of sea ice and ice shelves—structures that help define the margins of ice sheets—to account for both the rapid and the slower parts of the cycle.
View original post 1,221 more words
Ian Wilson has some contribution here from his research blog
http://astroclimateconnection.blogspot.com.au/2014/01/do-events-cause-rapid-warming-events-in.html
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http://astroclimateconnection.blogspot.com.au/2013/06/are-dansgaard-oeschger-d-o-warm-events.html
D-O warm events are abrupt increases in temperature to near-inter-glacial conditions that occurred during the last Ice-Age. These temperature increases occurred in a matter of decades and they were quickly followed by a period of gradual cooling.
The D-O events are discrete events paced by a regular cycle of 1470 years.
§ The five most recent events, arguably the best dated, have a standard deviation of only 32 years (2 %) about a 1470 year spacing.
§ This level of precision points to the orbital cycle explanation.
§ The 1,832 Lunar tidal cycle proposed by Keeling and Whorf (1998) cannot be reconciled with the 1,470 year spacing found in the Greenland ice-core data.
Bond Events and the next D-O/Bond Event should begin about 2150 A.D.!
Ian Wilson
the 1470 yr Lunar cycle
http://astroclimateconnection.blogspot.com.au/2013/06/are-dansgaard-oeschger-d-o-warm-events.html
zoom in here
https://picasaweb.google.com/110600540172511797362/MOON#6023232044408073250
Discussions here on Tallbloke
http://tallbloke.wordpress.com/2013/01/09/tim-cullen-solar-system-holocene-lawler-events/comment-page-1/#comment-46820
A thousand year cycle
identified by Salvatore Del Prete
“Using the identity, cos(u)*cos(v)=(cos(u-v)+cos(u+v))/2
The Leif Svalgaard model can be changed into an interacting additive model.
The frequencies 10.92533 and 10.69707 reproduce the results of the Leif Svalgaard model exactly because of the identity relationship.”
Salvatore’s photobucket
http://s1311.photobucket.com/user/aequitas45/media/Synthetic%20solar%20model/Multipliedmodel_zpsaf214d97.png.html
discussion here
http://tallbloke.wordpress.com/2014/07/28/nicola-scafetta-global-temperatures-and-sunspot-numbers-are-they-related-yes-but-non-linearly/comment-page-1/#comment-84859
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“But now change one of these fundamental frequencies slightly and the model produces a completely different pattern. If 10.69707 is changed by just 1 % to 10.80405 the model morphs into a completely different shape. The planets drive these basic frequencies through modulation.”
“To maintain the manifestation of the longer frequencies with the summation model requires certainty “