Saturday, August 15, 2015

We live in an era of unusual climate STABILITY

That's what the article below says in its academic way.  I have been saying it for years

Unstable AMOC during glacial intervals and millennial variability: The role of mean sea ice extent

Florian Sévellec & Alexey V. Fedorov


A striking feature of paleoclimate records is the greater stability of the Holocene epoch relative to the preceding glacial interval, especially apparent in the North Atlantic region. In particular, strong irregular variability with an approximately 1500 yr period, known as the Dansgaard–Oeschger (D–O) events, punctuates the last glaciation, but is absent during the interglacial. Prevailing theories, modeling and data suggest that these events, seen as abrupt warming episodes in Greenland ice cores and sea surface temperature records in the North Atlantic, are linked to reorganizations of the Atlantic Meridional Overturning Circulation (AMOC). In this study, using a new low-order ocean model that reproduces a realistic power spectrum of millennial variability, we explore differences in the AMOC stability between glacial and interglacial intervals of the 100 kyr glacial cycle of the Late Pleistocene (1 kyr=1000 yr). Previous modeling studies show that the edge of sea ice in the North Atlantic shifts southward during glacial intervals, moving the region of the North Atlantic Deep Water formation and the AMOC also southward. Here we demonstrate that, by shifting the AMOC with respect to the mean atmospheric precipitation field, such a displacement makes the system unstable, which explains chaotic millennial variability during the glacials and the persistence of stable ocean conditions during the interglacials.

Earth and Planetary Science Letters, Volume 429, 1 November 2015, Pages 60–68


Wireless.Phil said...

Every frigg'en news agency is reporting this, but Ginger on ABC is my favorite. Yes, she's pregnant, and married. Seems like all ABC and sister stations have someone pregnant now. Must be the water?

"Experts Warn of 'Godzilla El Nino' Storm That Could Rock West Coast" on YouTube

Wireless.Phil said...

Oh, I live in Ohio, it's always cold in winter here and Godzilla will have no effect on us out of the ordinary.


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