Apropos the recent spate of commenting about the hacked CRU emails, Kevin Trenberth has an article at The Daily Camera.
He makes this remark about his constantly mischaracterized “travesty” quote (“The fact is that we can’t account for the lack of warming at the moment and it is a travesty that we can’t.”):
The quote has been taken out of context. It relates to our ability to track energy flow through the climate system. We can do this very well from 1992 to 2003, when large warming occurred, but not from 2004 to 2008. The quote refers to our observation system which is inadequate to observe Earth’s energy flows at the accuracy needed to understand small fluctuations in climate; it does not mean there is no global warming, as is often interpreted by the likes of Danaher. What is does mean is that our observing system is not adequate to fully track the energy in ways that allow us to understand and make best statements about the effects of natural climate variability: the La NiÃ±a of 2007-2008, and the current El NiÃ±o, for instance.
Many have already said that is what it probably means, he is here saying it himself. That should put an end to the mischaracterizations, right? Rriiiight….
global warming does not stop weather from happening, and cold outbreaks continue and are fully expected. It does not stop winter. And it does not stop La NiÃ±a from happening and setting up unusually cold regional patterns of weather across the United States and other parts of the world that last a year or two.
To misunderstand the role of weather and natural climate variability the way it is being done is to undermine much-needed actions in limiting carbon dioxide emissions. Global warming is happening. It will continue to happen and the way we are going it will jeopardize the very nature of climate on planet Earth some decades from now. Because of the long lifetime of carbon dioxide, by the time it is so obvious to everyone, it will be far too late to do anything about it.
It is a constantly, and often intentionally, misunderstood fact that the large variability of weather will often overshadow the slow and constant march of CO2 driven warming. The weather can change tens of degrees from day to day in one location. In fact, the record change is 57oC, 105oF for our American readers, in a single 24hr period! (I leave it as an excercise for the reader to extrapolate that to a 100 year trend.) Globally averaged annual temperatures are about 2 orders of magnituded more stable but that still leaves room for one or two tenths of a degree each year.
IPCC projections for Anthropogenic warming range around .2 or .3oC per decade, (less now, increasing over time) and before you can assess a rate per decade you need a few. So 10 years, or even 20 years where the 5 year mean does not move much does not say anything about the trajectory of climate change.
I think if we wanted to use a mountain and molehill analogy here with Trenberth’s actual meaning and the misinterpretation that he is admitting global warming has stopped we couldn’t. As with all of the CRU email content, forget the mountain, even the molehill is absent.
(I saw this article via In It For the Gold)