maxparrish
Veteran Member
- Joined
- Aug 30, 2005
- Messages
- 2,262
- Location
- SF Bay Area
- Basic Beliefs
- Libertarian-Conservative, Agnostic.
While the climate-nestas have been relentlessly preaching ever more lurid images of imminent climate catastrophe, and praising the administrations efforts to end cheap power from fossil fuels, the politicians have not noticed that the science has moved on. It seems the "put up" or shut up day for climate change models is now approaching. After 18 years of increasingly non-predictive model failure and stable temperatures, time is running out for the alarmists - they have almost run out of excuses.
http://judithcurry.com/2014/10/09/my-op-ed-in-the-wall-street-journal-is-now-online/
Judith Curry, a long-time 'global warmer' climatologist has slowly evolved her views. More than a decade ago she started carefully reading skeptic blogs, in particular climate audit, and kept an open mind. At this point she, like many others, are no longer supporting the alarmist meme and believe warming is occurring, but at a rate below that of most model predictions.
And remember the old alarmist excuse that the temperature increases are hidden in the deep ocean currents?
http://www.jpl.nasa.gov/news/news.php?feature=4321
http://judithcurry.com/2014/10/09/my-op-ed-in-the-wall-street-journal-is-now-online/
Judith Curry, a long-time 'global warmer' climatologist has slowly evolved her views. More than a decade ago she started carefully reading skeptic blogs, in particular climate audit, and kept an open mind. At this point she, like many others, are no longer supporting the alarmist meme and believe warming is occurring, but at a rate below that of most model predictions.
The Global Warming Statistical Meltdown
At the recent United Nations Climate Summit, Secretary-General Ban Ki-moon warned that “Without significant cuts in emissions by all countries, and in key sectors, the window of opportunity to stay within less than 2 degrees [of warming] will soon close forever.” Actually, this window of opportunity may remain open for quite some time. A growing body of evidence suggests that the climate is less sensitive to increases in carbon-dioxide emissions than policy makers generally assume—and that the need for reductions in such emissions is less urgent....
In its most optimistic projections, which assume a substantial decline in emissions, the Intergovernmental Panel on Climate Change (IPCC) projects that the “dangerous” level might never be reached. In its most extreme, pessimistic projections, which assume heavy use of coal and rapid population growth, the threshold could be exceeded as early as 2040. But these projections reflect the effects of rising emissions on temperatures simulated by climate models, which are being challenged by recent observations.
Human-caused warming depends not only on increases in greenhouse gases but also on how “sensitive” the climate is to these increases. Climate sensitivity is defined as the global surface warming that occurs when the concentration of carbon dioxide in the atmosphere doubles. If climate sensitivity is high, then we can expect substantial warming in the coming century as emissions continue to increase. If climate sensitivity is low, then future warming will be substantially lower, and it may be several generations before we reach what the U.N. considers a dangerous level, even with high emissions.
The IPCC’s latest report (published in 2013) concluded that the actual change in 70 years if carbon-dioxide concentrations double, called the transient climate response, is likely in the range of 1 to 2.5 degrees Celsius. Most climate models have transient climate response values exceeding 1.8 degrees Celsius. But the IPCC report notes the substantial discrepancy between recent observation-based estimates of climate sensitivity and estimates from climate models.
Nicholas Lewis and I have just published a study in Climate Dynamics that shows the best estimate for transient climate response is 1.33 degrees Celsius with a likely range of 1.05-1.80 degrees Celsius. Using an observation-based energy-balance approach, our calculations used the same data for the effects on the Earth’s energy balance of changes in greenhouse gases, aerosols and other drivers of climate change given by the IPCC’s latest report.
We also estimated what the long-term warming from a doubling of carbon-dioxide concentrations would be, once the deep ocean had warmed up. Our estimates of sensitivity, both over a 70-year time-frame and long term, are far lower than the average values of sensitivity determined from global climate models that are used for warming projections. Also our ranges are narrower, with far lower upper limits than reported by the IPCC’s latest report. Even our upper limits lie below the average values of climate models.
Our paper is not an outlier. More than a dozen other observation-based studies have found climate sensitivity values lower than those determined using global climate models, including recent papers published in Environmentrics (2012), Nature Geoscience (2013) and Earth Systems Dynamics (2014). These new climate sensitivity estimates add to the growing evidence that climate models are running “too hot.” Moreover, the estimates in these empirical studies are being borne out by the much-discussed “pause” or “hiatus” in global warming—the period since 1998 during which global average surface temperatures have not significantly increased.
This pause in warming is at odds with the 2007 IPCC report, which expected warming to increase at a rate of 0.2 degrees Celsius per decade in the early 21st century. The warming hiatus, combined with assessments that the climate-model sensitivities are too high, raises serious questions as to whether the climate-model projections of 21st century temperatures are fit for making public policy decisions....
And remember the old alarmist excuse that the temperature increases are hidden in the deep ocean currents?
http://www.jpl.nasa.gov/news/news.php?feature=4321
NASA Study Finds Earth’s Ocean Abyss Has Not Warmed
The cold waters of Earth’s deep ocean have not warmed measurably since 2005, according to a new NASA study, leaving unsolved the mystery of why global warming appears to have slowed in recent years.
Scientists at NASA’s Jet Propulsion Laboratory in Pasadena, California, analyzed satellite and direct ocean temperature data from 2005 to 2013 and found the ocean abyss below 1.24 miles (1,995 meters) has not warmed measurably. Study coauthor Josh Willis of JPL said these findings do not throw suspicion on climate change itself.
“The sea level is still rising,” Willis noted. “We’re just trying to understand the nitty-gritty details.”
In the 21st century, greenhouse gases have continued to accumulate in the atmosphere, just as they did in the 20th century, but global average surface air temperatures have stopped rising in tandem with the gases. The temperature of the top half of the world’s ocean — above the 1.24-mile mark — is still climbing, but not fast enough to account for the stalled air temperatures. (Emphasis added.)