“They find that tropospheric temperature records must be at least 17 years long to discriminate between internal climate noise and the signal of human-caused changes.”…
11/16/2011, “Separating signal and noise in climate warming,” Lawrence Livermore Labs press release, Anne M. Stark
“In order to separate human-caused global warming from the “noise” of purely natural climate fluctuations,
temperature records must be at least 17 years long, according to climate scientists.
To address criticism of the reliability of thermometer records of surface warming, Lawrence Livermore National Laboratory scientists analyzed satellite measurements of the temperature of the lower troposphere (the region of the atmosphere from the surface to roughly five miles above) and saw a clear signal of human-induced warming of the planet.
Satellite measurements of atmospheric temperature are made with microwave radiometers, and are completely independent of surface thermometer measurements. The satellite data indicate that the lower troposphere has warmed by roughly 0.9 degrees Fahrenheit since the beginning of satellite temperature records in 1979. This increase is entirely consistent with the warming of Earth’s surface estimated from thermometer records.
Recently, a number of global warming critics have focused attention on the behavior of Earth’s temperature since 1998. They have argued that there has been little or no warming
over the last 10 to 12 years, and that computer models of the climate
system are not capable of simulating such short “hiatus periods” when
models are run with human-caused changes in greenhouse gases.
“Looking at a single, noisy 10-year period is cherry picking, and does not provide reliable information about the presence or absence of human effects on climate,” said Benjamin Santer, a climate scientist and lead author on an article in the Nov. 17 online edition of the Journal of Geophysical Research (Atmospheres)….
“In fingerprinting, we analyze longer, multi-decadal temperature
records, and we beat down the large year-to-year temperature variability
caused by purely natural phenomena (like El NiÃ’Â±os and La NiÃ’Â±as).
This makes it easier to identify a slowly-emerging signal arising from
gradual, human-caused changes in atmospheric levels of greenhouse
gases,” Santer said.
The LLNL-led research shows
that climate models can and do simulate short, 10- to 12-year “hiatus
periods” with minimal warming, even when the models are run with
historical increases in greenhouse gases and sulfate aerosol particles. They find that tropospheric temperature records must be at least 17 years long to discriminate between internal climate noise and the signal of human-caused changes in the chemical composition of the atmosphere.
“One individual short-term trend doesn’t tell you much about long-term climate change,” Santer said. “A single decade of observational temperature data is inadequate
for identifying a slowly evolving human-caused warming signal. In both
the satellite observations and in computer models, short, 10-year
tropospheric temperature trends are strongly influenced by the large
noise of year-to-year climate variability.”
The research team is made up of Santer and Livermore colleagues
Charles Doutriaux, Peter Caldwell, Peter Gleckler, Detelina Ivanova,
and Karl Taylor, and includes collaborators from Remote Sensing Systems,
the National Center for Atmospheric Research, the University of Colorado, the Canadian Centre for Climate Modeling and Analysis, the National Oceanic and Atmospheric Administration, the U.K. Meteorology Office Hadley Centre, and Lawrence Berkeley National Laboratory.”
11/22/13, “Price of Electricity Hit Record for October; Up 42% in Decade,“ CNS News, BLS data, record for month of October
10/30/13, “Climate Scientist: 73 UN Climate Models Wrong, No Global Warming in 17 Years,” CNS News, Barbara Hollingsworth
temperatures collected in five official databases confirm that there
has been no statistically significant global warming for the past 17
years, according to Dr. John Christy, professor of
atmospheric science and director of the Earth System Science Center at
the University of Alabama Huntsville (UAH)….
Christy told CNSNews that he analyzed all 73 models used in the 5AR and not one accurately predicted that the Earth’s temperature would remain flat since Oct. 1, 1996. (See Temperatures v Predictions 1976-2013.pdf)…
Using datasets of actual temperatures recorded by the NASA Goddard Institute for Space Studies (NASA GISS), the United Kingdom’s Hadley Centre for Climate Prediction and Research at the University of East Anglia (Hadley-CRU), the National Oceanic and Atmospheric Administration (NOAA), satellites measuring atmospheric and deep oceanic temperatures, and a remote sensor system in California, Christy found that “all show a lack of warming over the past 17 years.”
“All 73 models’ predictions were on average three to four times what occurred in the real world,” Christy pointed out. “The closest was a Russian model that predicted a one-degree increase.”
“October 1st marks the 17th year of no global warming significantly different than zero,” agreed Dr. Patrick Michaels, director of the Cato Institute’s Center for the Study of Science. “And those 17 years correspond to the largest period of CO2 emissions by far over any other 17-year period in history.”…
Reaching the 17-year mark with no significant warming is a milestone because a climate change research team at the Lawrence Livermore National Laboratory defined it as the minimum length of time necessary to “separate human-caused global warming from the ‘noise’ of purely natural climate fluctuations,” according to a 2011 press release….
Seventeen years without a temperature increase is also at odds with a report by the United Kingdom’s Met Office
that said “global mean surface temperatures rose rapidly from the
1970s, but have been relatively flat over the most recent 15 years to
2013.” (See Met Office July 2013.PDF)
“The Met Office simply didn’t go back 17 years,” Christy said to explain the two-year discrepancy….
When asked how useful the just-released IPCC report will be in predicting future global temperatures, he said: “Not very. When 73 out of 73 [climate models] miss the point and predict temperatures that are significantly above the real world, they cannot be used as scientific tools, and definitely not for public policy decision-making.”
In 2012, Christy testified before the Senate Committee on Environment and Public Works, telling senators that “the recent anomalous weather can’t be blamed on carbon dioxide.”
“We’ve had 17 years of no global warming,
yet we have an energy policy right now that continues to harm American
communities and will lead to much higher electricity prices
all based on the ‘fact’ that the world is warming,” Daniel Kish,
vice-president of the Institute for Energy Research, told CNSNews.com.
“Yet they cannot explain why all their projections are wrong.”…
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