Wired reports Trenberth’s response to leaked email: “**loggers are missing the point he’s making in the e-mail by not reading the article cited in it.” Wired’s Threat Level blog reported on Trenberth’s response to the leaked email:
But Trenberth, who acknowledged the e-mail is genuine, says bloggers are missing the point he's making in the e-mail by not reading the article cited in it. That article - An Imperative for Climate Change Planning (.pdf) - actually says that global warming is continuing, despite random temperature variations that would seem to suggest otherwise.
"It says we don't have an observing system adequate to track it, but there are all other kinds of signs aside from global mean temperatures - including melting of Arctic sea ice and rising sea levels and a lot of other indicators - that global warming is continuing," he says.
RealClimate.org on Trenberth’s email: “You need to read his recent paper” for context. A November 23 blog post on RealClimate.org, purporting to “shed some light on some of the context which is missing in some of the discussion of various emails”, said of Trenberth’s email:
You need to read his recent paper on quantifying the current changes in the Earth's energy budget to realise why he is concerned about our inability currently to track small year-to-year variations in the radiative fluxes.
Trenberth email cited “my own article on where the heck is global warming?” in stating that “Our observing system is adequate” to identify current warming. Trenberth’s October 12, 2009, email, which Beck quoted, reads:
Hi all
Well I have my own article on where the heck is global warming ? We are asking that here in Boulder where we have broken records the past two days for the coldest days on record. We had 4 inches of snow. The high the last 2 days was below 30F and the normal is 69F, and it smashed the previous records for these days by 10F. The low was about 18F and also a record low, well below the previous record low.
This is January weather (see the Rockies baseball playoff game was canceled on saturday and then played last night in below freezing weather).
Trenberth, K. E., 2009: An imperative for climate change planning: tracking Earth's global energy. Current Opinion in Environmental Sustainability, 1, 19-27, doi:10.1016/j.cosust.2009.06.001. [1][PDF] (A PDF of the published version can be obtained from the author.)
***
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 CERES data published in the August BAMS 09 supplement on 2008 shows there should be even more warming: but the data are surely wrong. Our observing system is inadequate.***
Trenberth article indeed referred to what he called an “incomplete explanation” of short-term climate variations, and maintained that “global warming is unequivocally happening.” In the article to which Trenberth referred in Wired, “An imperative for climate change planning: tracking Earth’s global energy,” he wrote:
The global mean temperature in 2008 was the lowest since about 2000 (Fig. 1). Given that there is continual heating of the planet, referred to as radiative forcing, by accelerating increases of carbon dioxide (Fig. 1) and other greenhouses due to human activities, why isn't the temperature continuing to go up? The stock answer is that natural variability plays a key role and there was a major La Niña event early in 2008 that led to the month of January having the lowest anomaly in global temperature since 2000. While this is true, it is an incomplete explanation.
[...]
Given that global warming is unequivocally happening and there has so far been a failure to outline, let alone implement, global plans to mitigate the warming, then adapting to the climate change is an imperative. We will of course adapt to climate change. The question is the extent to which the adaptation is planned and orderly with minimal disruption and loss of life, or whether it is unplanned? To plan for and cope with effects of climate change requires information on what is happening and why, whether observed changes are likely to continue or are a transient, how they affect regional climates and the possible impacts. Further, to the extent that the global community is able to reduce greenhouse gas emissions and mitigate the climate change, then information is required on how effective it is. This article addresses vital information needs to help understand climate change.
It is not a sufficient explanation to say that a cool year is due to natural variability. Similarly, common arguments of skeptics that the late 20th century warming is a recovery from the Little Ice Age or has other natural origins are inadequate as they do not provide the physical mechanisms involved. There must be a physical explanation, whether natural or anthropogenic. If surface warming occurs while the deep ocean becomes cooler, then we should be able to see the evidence. It may be that there is insufficient data to prove one way or the other, as is often the case in the deep past. However, since 1979 there have been instruments in space tracking the total solar irradiance (TSI)3,4, and so we know it is not the sun that has brought about warming in the past 30 years5. Hence a key issue is the extent to which we can track energy in the climate system.