New Paper On Younger Dryas Cold Event

Wednesday, April 21, 2010 9:15 PM

Dear Friends,

New paper about the Younger Dryas cold event has been
published in:

Broecker, W. S., G. H. Denton, R. L. Edwards, H. Cheng,
R. B. Alley, and A. E. Putnam, 2010, Putting the Younger
Dryas cold event into context Quaternary Science Reviews.
vol. 29, no. 9-10, pp. 1078-1081.

Abstract at:
http://dx.doi.org/10.1016/j.quascirev.2010.02.019

This paper argues that “rather than being a freak occurrence,
the Younger Dryas is an integral part of the deglacial
sequence of events that produced the last termination on a
global scale.”

The abstract also states:

“The recent suggestion that the Younger Dryas was triggered
by the impact of a comet has not gained traction.”

The paper also disputes the hypothesis that the Younger
Dryas was triggered by a flood of water stored in proglacial
Lake Agassiz.

The paper concludes that “when viewed in the context of
the last four terminations, cold reversals equivalent to
the YD seem to be integral parts of global switches from
glacial to interglacial climate. No one-time catastrophe is
required.”

and

“Based on these observations of the climate signatures
during several terminations, we conclude that there is no
need to call upon a one-time catastrophic event to explain
the YD. More likely, the YD was a necessary part of the
last termination.”

A related paper by Dr. Broecker is “Was the Younger Dryas
Triggered by a Flood?” at:

http://www.ldeo.columbia.edu/res/div/ocp/gs/pubs/broecker_science.pdf

Yours,

Paul H.

Corrected URLs for "Mini ice age took hold of Europe in months" Post

oxytropidoceras at cox.net oxytropidoceras at cox.net
Fri Nov 13 13:52:05 EST 2009

The correct URLs for the papers mentioned in "Mini ice age
took hold of Europe in months" post are:

Wiersma, A. P., and H. Renssen, 2006, Model-data
comparison for the 8.2 ka BP event: confirmation of
a forcing mechanism by catastrophic drainage of
Laurentide Lakes. Quaternary Science Reviews.
vol. 25, no. 1-2, pp. 63-88.
http://dx.doi.org/10.1016/j.quascirev.2005.07.009

Another paper is:

Alleya, R. A., and A. M. Agustsdottira, 2005, The 8k
event: cause and consequences of a major Holocene
abrupt climate change. Quaternary Science Reviews.
vol. 24, no. 10-11, pp. 1123-1149.
http://dx.doi.org/10.1016/j.quascirev.2004.12.004

Mini ice age took hold of Europe in months

oxytropidoceras at cox.net oxytropidoceras at cox.net
Fri Nov 13 13:48:48 EST 2009

Mini ice age took hold of Europe in months
by Kate Ravilious, Nov. 11, 2009, New Scientist
Magazine no. 2734, http://tiny.cc/YoungerDryas
http://www.newscientist.com/article/mg20427344.800-mini-ice-age-took-hold-of-europe-in-months.html?full=true&print=true
http://www.newscientist.com/issue/2734

Dr. William Patterson’s Publications can be found at:
http://geochemistry.usask.ca/publications.html

The above article stated:

“Two studies published in 2006 show that the same
thing happened again 8200 years ago, when the
Northern hemisphere went through another cold spell”

The New Scientist article about these two studies is:

Broken ice dam blamed for 300-year chill by Kurt
Kleiner, January 10, 2006, New Scientist Magazine.
http://tiny.cc/8200BP
http://www.newscientist.com/article/dn8558-broken-ice-dam-blamed-for-300year-chill.html

“In the new papers, one in the Proceedings of the
National Academy of Sciences and the other in the
current Quaternary Science Reviews, two teams of
researchers using different computer models say
that both models show that such a freshwater flood
could shut down ocean circulation in a way that is
consistent with temperature data from the time.”

These papers demonstrate that processes other than
extraterrestrial impacts can cause events very similar
to the Youmnger Dryas interval. They are:

LeGrande, A. N., G. A. Schmidt, D. T. Shindell, C. V.
Field, R. L. Miller, D. M. Koch, G. Faluvegi, and G.
Hoffmann, 2006, Consistent simulations of multiple
proxy responses to an abrupt climate change event.
Proceedings of the National Academy of Sciences of
the United States, vol. 103 no. 4, pp. 837-842
http://www.pnas.org/content/103/4/837.abstract

Wiersma, A. P., and H. Renssen, 2006, Model-data
comparison for the 8.2 ka BP event: confirmation of
a forcing mechanism by catastrophic drainage of
Laurentide Lakes. Quaternary Science Reviews.
vol. 25, no. 1-2, pp. 63-88.
http://dx.doi.org/10.1016/j.quascirev.2005.07.009"

Another paper is:

Alleya, R. A., and A. M. Agustsdottira, 2005, The 8k
event: cause and consequences of a major Holocene
abrupt climate change. Quaternary Science Reviews.
vol. 24, no. 10-11, pp. 1123-1149.
http://dx.doi.org/10.1016/j.quascirev.2004.12.004"

Yours,

Paul H.