multidecadal

RE: #25 – Assuming that the decline in sea ice at late summer extent minima that seems to have been measured since the late 1970s is partially or wholly due to AGW as yet unproven and technically indistinguishable from other possibilities such as multidecadal cycles I would be open to a scenario whereby the extent at the minimum is reduced enough to allow NW Passage navigation most years.

Ayles Ice Shelf, Ellesmere Island « Climate Audit 2007

We also know of a number of multidecadal ocean current cycles that, like the present one, are likely to bring warmer waters into the arctic at times, reducing ice extent as they have over the last seven years.

Matthew Yglesias » Wednesday Arctic Ice Blogging 2009

The historical multidecadal-scale variability in Atlantic hurricane activity is much greater than what would be "expected" from a gradual temperature increase attributed to global warming 5.

Evidence of adverse editorial selection by the CRU Email theives EliRabett 2010

Because these changes exhibit a multidecadal time scale, the present high level of hurricane activity is likely to persist for an additional ~10 to 40 years.

Evidence of adverse editorial selection by the CRU Email theives EliRabett 2010

Changes have been made to alter the historical record to mask cyclical changes that could be readily explained by natural factors like multidecadal ocean and solar changes.

It's a slow week EliRabett 2010

The paper clearly states that natural multidecadal variability in Atlantic is greater than any possible anthropogenic signal so far.

Evidence of adverse editorial selection by the CRU Email theives EliRabett 2010

The multidecadal trend .. showed no warming in the mid-19th century and is ≈0.008°C per year currently.

Too bad to be believed EliRabett 2010

However, this dataset and longer versions spanning the past several centuries indicate large variations in trends over multidecadal periods.

Sea ice in the Arctic 2009

(A multidecadal period of cooling had preceded the last coupling, which happened in 1976/77.)

Jeremy Jacquot: Hot or Not? Making Sense of Climate Variability 2009

Comparing two multidecadal periods in the second half of the 20th century, Frich et al. [81] reported an increase in most indicators of heavy precipitation events over western Russia, eastern Canada, and northern Europe, while Siberia showed a decrease in the frequency and/or duration of heavy precipitation events.

Arctic climate variability in the twentieth century 2009