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. ❋ Unknown (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. ❋ Unknown (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. ❋ 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. ❋ 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. ❋ EliRabett (2010)
The paper clearly states that natural multidecadal variability in Atlantic is greater than any possible anthropogenic signal so far. ❋ EliRabett (2010)
The multidecadal trend .. showed no warming in the mid-19th century and is ≈0.008°C per year currently. ❋ EliRabett (2010)
However, this dataset and longer versions spanning the past several centuries indicate large variations in trends over multidecadal periods. ❋ Unknown (2009)
(A multidecadal period of cooling had preceded the last coupling, which happened in 1976/77.) ❋ Unknown (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. ❋ Unknown (2009)
I myself have published scientific work that has been considered by some as representing a skeptical point of view on matters relating to climate change (for example, my work demonstrating the importance of natural oscillations of the climate on multidecadal timescales). ❋ Unknown (2009)
Pielke Sr et al; Unresolved issues with the assessment of multidecadal global land surface temperature trends. ❋ EliRabett (2008)
Soon, “Variable solar irradiance as a plausible agent for multidecadal variations in the Arctic-wide surface air temperature record of the past 130 years”, Geophysical Research Letters, 32, doi.10.1029/2005GL023429 2005. ❋ EliRabett (2008)
Hurricanes, too, vary on multidecadal time scales; sea-surface temperature is likely to be an important factor. ❋ Unknown (2006)
This temperature, itself, varies on multidecadal time scales. ❋ Unknown (2006)
Pielke: Global and regional climate models have not demonstrated themselves to be skillful predictors of regional and local climate change and variability over multidecadal time scales. ❋ GayandRight (2007)
The enhanced upwelling is an oscillation, but it still affects global temperature on multidecadal scales. ❋ Unknown (2007)
