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To: Sam who wrote (5046)2/16/2009 5:11:34 PM
From: Brumar89  Respond to of 86356
 
Re. arctic sea ice, tpm is looking at 2/15 data. This (arctic sea ice) has been in the news periodically since 2007, notably back in August 2007, then last month January 2008. If you listen to the right alarmist (say, Al Gore) its gonna be gone for good soon and the polar bears are endangered. Every time the comparison is down, it makes news. The long term trend since 1979 (all we have) in arctic sea ice is downward but pretty small. Is this a catastrophe in the making, is it just normal variation? You can pick dates that show the bigger differences if you want to make things look as alarmsit as possible. Pick your date that shows the most alarmist result. Thats what old Josh is doing. Meanwhile antarctic ice has trended up.

Re. Will's other claim:

"[A]ccording to the World Meteorological Organization, there has been no recorded global warming for more than a decade."

That was true as even Josh Marshall admitted. BUT he says, you have to look at it in context. you need to look at data over a broad period to get a realistic assessment of what's going on. And if you pick the right period .... blah blah blah ... Yes, its all a matter of what beginning and ending period you pick and Josh Marshall would rather pick some other date. But not too early - like say from the MWP.

Sure the earth has been warming since the end of the little ice age. And its not been warming since 1998 as Will correctly said.

The important thing is whether our CO2 increases are driving global temperature in a catatrophic direction or not.



To: Sam who wrote (5046)2/16/2009 5:20:18 PM
From: Brumar89  Read Replies (1) | Respond to of 86356
 
MEanwhile the fingerprint of greenhouse gas caused global warming that the UN identified (a hot spot in the tropical troposphere) has not shown up casting doubt on the entire AGW theory. For some reason, its my observation alarmists don't like to talk about this.


There is no one piece of evidence for AGW, and never has been.

Actually there is, or rather there is supposed to be. I'm surprised you don't know about it.

1)
heliogenic.blogspot.com

2)
The UN, in its 2007 climate assessment report, displays a series of plots of predicted rates of temperature change over the decades at altitudes from the Earth’s surface to 30 km, at latitudes from the South Pole via the Equator to the North Pole. Colors are used to illustrate the rates of change in temperature which the UN’s climate models predict, measured in degrees Celsius per decade. Each distinct cause of warming produces a visibly-distinct plot.

Six causes of atmospheric warming are considered. First, plots of natural warming caused by changes in total incoming solar radiation and changes in volcanic activity are shown, followed by plots of anthropogenic warming caused by emissions of greenhouse gases, changes in tropospheric and stratospheric ozone concentration, and the radiative forcing caused by sulphate aerosol particles (which actually cause cooling). Finally, the five plots of predicted warming are combined to create a single, sixth plot.

It is at once visible that the predicted warming caused by greenhouse-gas concentrations produces a pattern strongly distinct from other causes of warming. A “hot spot” appears between 8km and 12km of altitude in or near the tropics. At this computer-predicted “hot spot” high above the Earth, the UN’s models project that greenhouse warming will cause temperature to rise over the decades at a rate up to three times faster than at the surface.
.....
This instantly-recognizable “hot-spot” on the altitude-versus-latitude plot of predicted rates of temperature change is the unmistakable signature or characteristic fingerprint of greenhouse warming which we have been looking for.
....
Real-world temperatures in the upper atmosphere have been measured with balloons since at least the 1960's and with microwave satellite sensors since 1979. However, the Hadley Centre’s plot of real-world radiosonde observations does not demonstrate the “global warming hot-spot” at all. The predicted phenomenon is startlingly and entirely absent from the observational record –

The contrast between the five computer models’ predicted signature of greenhouse warming and the Hadley Centre’s plot of observed decadal rates of change in temperature could not be starker. This astonishing result is explicitly confirmed by the UN’s 2007 assessment report, which describes the near-total absence of its own predicted “hot-spot” signature of anthropogenic greenhouse warming in the observed temperature record, but apparently without appreciating its significance


“9.4.4.1 Observed Changes

“... All data sets show that the global mean and tropical troposphere has warmed from 1958 to the present, with the warming trend in the troposphere slightly greater than at the surface. Since 1979, it is likely that there is slightly greater warming in the troposphere than at the surface, although uncertainties remain in observed tropospheric warming trends and whether these are greater or less than the surface trend. The range (due to different data sets) of the global mean tropospheric temperature trend since 1979 is 0.12°C to 0.19°C per decade based on satellite-based estimates (Chapter 3) compared to a range of 0.16°C to 0.18°C per decade for the global surface warming.”
....
Applying Occam’s Razor, the simplest explanation for the discrepancy between theoretical modeling and real-world observation is that the models on which the case for alarm about climate change are based are very substantially overestimating the effect of anthropogenic greenhouse warming on global temperatures.
The Climate Change Science Program, however, prefers to assume that it is observation, rather than theory, that is deficient.
.....
Can the discrepancy between prediction and observation be explained, as the CCSP suggests, by uncertainties in the observed data? The very close correlation between anomalies in tropical outgoing long-wave radiation and anomalies in global lower-troposphere temperatures, taken with the near-total absence of correlation between monotonic increases in CO2 concentration and chaotic temperature anomalies, suggests that it is the computer models, not real-world observations that are likely to be at fault. Ultimately this question can only be resolved by collecting further data: but the CCSP’s predisposition in favor of theoretical modeling and against the results of direct observation is commonplace among official climate-science bodies. Or does the discrepancy arise because the predictions are carried through to equilibrium climate response, while the observations are perforce carried only to a transient response? Professor Lindzen comments that this failure of observation to match prediction cannot be so easily explained, since the transient response would be likely to exceed the equilibrium response. He concludes that no more than about a third of the observed trend at the surface is likely to be due to greenhouse warming, and adds: “This is about as close as one ever gets to proof in climate physics.”

On this analysis, “global warming” is unlikely to be dangerous and extremely unlikely to be catastrophic.
scienceandpublicpolicy.org

3) See the summary:
scribd.com

4)
Can you have a consensus if no one agrees what the consensus is?
January 5, 2009, 10:12 am
Over at the Blackboard, Lucia has a post with a growing set of comments about anthropogenic warming and the tropical, mid-tropospheric hotspot. Unlike many who are commenting on the topic, I have actually read most of the IPCC AR4 (painful as that was), and came to the same conclusion as Lucia: that the IPCC said the climate models predicted a hot spot in the mid-troposphere, and that this hot spot was a unique fingerprint of global warming (”fingerprint” being a particularly popular word among climate scientists).
....
OK, pretty straight-forward. The problem is that this hot spot has not really appeared. In fact, the pattern of warming by altitude and latitude over the last thirty years looks nothing like the circled prediction graphs.
....
The scientists at RealClimate (lead defenders of the climate orthodoxy) are not unaware that the hot spot is not appearing. They responded about a year ago that 1) The hot spot is not an anthropogentic-specific fingerprint at all, but will result from all new forcings

the pattern really has nothing to do with greenhouse gas changes, but is a more fundamental response to warming (however caused). Indeed, there is a clear physical reason why this is the case - the increase in water vapour as surface air temperature rises causes a change in the moist-adiabatic lapse rate (the decrease of temperature with height) such that the surface to mid-tropospheric gradient decreases with increasing temperature (i.e. it warms faster aloft). This is something seen in many observations and over many timescales, and is not something unique to climate models.

and they argued 2) that we have not had enough time for the hot spot to appear and they argued 3) all that satellite data really has a lot of error in it anyway.
....
But here is what makes me crazy: It is quite normal in science for scientists to have a theory, make a prediction based on this theory, and then go back and tweak the theory when data from real physical processes does not match the predictions. There is certainly no shame in being wrong. The whole history of science is about lurching from failed hypothesis to the next, hopefully improving understanding with each iteration.

But the weird thing about climate science is the sort of Soviet-era need to rewrite history. Commenters on both Lucia’s site and at Climate Audit argue that the IPCC never said the hot spot was a unique fingerprint. The fingerprint has become an un-person.

Why would folks want to do this? After all, science is all about hypothesis - experimentation - new hypothesis. Well, most science. The problem is that climate science has been declared to be 1) A Consensus and 2) Settled. But settled consensus can’t, by definition, have disagreements and falsified forecasts. So history has to be rewritten to protect the infallibility of the Pope the Presidium the climate consensus. It’s a weird way to conduct science, but a logical outcome when phrases like “the science is settled” and “consensus” are used as clubs to silence criticism.
climate-skeptic.com



To: Sam who wrote (5046)2/19/2009 12:34:36 PM
From: Brumar892 Recommendations  Respond to of 86356
 
NSIDC: satellite sea ice sensor has “catastrophic failure” - data faulty for the last 45 or more days
18 02 2009

The DMSP satellite is still operating, but the SSM/I sensor is not

Regular readers will recall that on Feb 16th I blogged about this graph of arctic sea ice posted on the National Snow and Ice Data Center sea ice news page. The downward jump in the blue line was abrupt and puzzling.

Click for larger image

Today NSIDC announced they had discovered the reason why. The sensor on the Defense Meteorological Satellite Program (DMSP) satellite they use had degraded and now apparently failed to the point of being unusable. Compounding the bad news they discovered it had been in slow decline for almost two months, which caused a bias in the arctic sea ice data that underestimated the total sea ice by 500,000 square kilometers. This will likely affect the January NSIDC sea ice totals.

Figure 1. High-resolution image Daily Arctic sea ice extent map for February 15, 2009, showed areas of open water which should have appeared as sea ice. Sea Ice Index data. About the data. Please note that our daily sea ice images, derived from microwave measurements, may show spurious pixels in areas where sea ice may not be present. These artifacts are generally caused by coastline effects, or less commonly by severe weather. Scientists use masks to minimize the number of “noise” pixels, based on long-term extent patterns. Noise is largely eliminated in the process of generating monthly averages, our standard measurement for analyzing interannual trends. Data derived from Sea Ice Index data set.

—Credit: National Snow and Ice Data Center

Figure 2. High-resolution image
Daily total Arctic sea ice extent between 1 December 2008 and 12 February 2009 for Special Sensor Microwave/Imager SSM/I compared to the similar NASA Earth Observing System Advanced Microwave Scanning Radiometer (EOS AMSR-E) sensor. —Credit: National Snow and Ice Data Center

Dr. Walt Meier of NSIDC had planned to do a guest post here on WUWT, but this evening, with the magnitude of the problem looming, he’s asked to defer that post until later. I certainly can’t fault him for that. He’s got his hands full. Hopefully they have a contingency plan in place for loss of the sensor/space platform. I applaud NSIDC for recognizing the problem and posting a complete and detailed summary today. I’ve resposted it below in its entirety. Note that this won’t affect other ice monitoring programs that use the Advanced Microwave Scanning Radiometer (EOS AMSR-E) sensor, which is on an entirely different platform, the AQUA satellite. - Anthony

From NSIDC Sea Ice News:
As some of our readers have already noticed, there was a significant problem with the daily sea ice data images on February 16. The problem arose from a malfunction of the satellite sensor we use for our daily sea ice products. Upon further investigation, we discovered that starting around early January, an error known as sensor drift caused a slowly growing underestimation of Arctic sea ice extent. The underestimation reached approximately 500,000 square kilometers (193,000 square miles) by mid-February. Sensor drift, although infrequent, does occasionally occur and it is one of the things that we account for during quality control measures prior to archiving the data. See below for more details.

We have removed the most recent data and are investigating alternative data sources that will provide correct results. It is not clear when we will have data back online, but we are working to resolve the issue as quickly as possible.

Where does NSIDC get its data?
NSIDC gets sea ice information by applying algorithms to data from a series of Special Sensor Microwave/Imager (SSM/I) sensors on Defense Meteorological Satellite Program (DMSP) satellites. These satellites are operated by the U.S. Department of Defense. Their primary mission is support of U.S. military operations; the data weren’t originally intended for general science use.

The daily updates in Arctic Sea Ice News & Analysis rely on rapid acquisition and processing of the SSM/I data. Because the acquisition and processing are done in near-real time, we publish the daily data essentially as is. The data are then archived and later subjected to very strict quality control. We perform quality control measures in coordination with scientists at the NASA Goddard Space Flight Center, which can take up to a year. High-quality archives from SSM/I, combined with data from the earlier Scanning Multi-channel Microwave Radiometer (SMMR) data stream (1979–1987) provide a consistent record of sea ice conditions now spanning 30 years.

Data error sources
As discussed above, near-real-time products do not undergo the same level of quality control as the final archived products, which are used in scientific research published in peer-reviewed journals. However, the SSM/I sensors have proven themselves to be generally quite stable. Thus, it is reasonable to use the near-real-time products for displaying evolving ice conditions, with the caveat that errors may nevertheless occur. Sometimes errors are dramatic and obvious. Other errors, such as the recent sensor drift, may be subtler and not immediately apparent. We caution users of the near-real-time products that any conclusions from such data must be preliminary. We believe that the potential problems are outweighed by the scientific value of providing timely assessments of current Arctic sea ice conditions, as long as they are presented with appropriate caveats, which we try to do.

For several years, we used the SSM/I sensor on the DMSP F13 satellite. Last year, F13 started showing large amounts of missing data. The sensor was almost 13 years old, and no longer provided complete daily data to allow us to track total daily sea ice extent. As a result, we switched to the DMSP F15 sensor for our near-real-time analysis. For more information on the switch, see “Note on satellite update and intercalibration,” in our June 3, 2008 post.

On February 16, 2009, as emails came in from puzzled readers, it became clear that there was a significant problem—sea-ice-covered regions were showing up as open ocean. The problem stemmed from a failure of the sea ice algorithm caused by degradation of one of the DMSP F15 sensor channels. Upon further investigation, we found that data quality had begun to degrade over the month preceding the catastrophic failure. As a result, our processes underestimated total sea ice extent for the affected period. Based on comparisons with sea ice extent derived from the NASA Earth Observing System Advanced Microwave Scanning Radiometer (EOS AMSR-E) sensor, this underestimation grew from a negligible amount in early January to about 500,000 square kilometers (193,000 square miles) by mid-February (Figure 2). While dramatic, the underestimated values were not outside of expected variability until Monday, February 16. Although we believe that data prior to early January are reliable, we will conduct a full quality check in the coming days.

Sensor drift is a perfect but unfortunate example of the problems encountered in near-real-time analysis. We stress, however, that this error in no way changes the scientific conclusions about the long-term decline of Arctic sea ice, which is based on the the consistent, quality-controlled data archive discussed above.

We are actively investigating how to address the problem. Since we are not receiving good DMSP SSM/I data at the present time, we have temporarily discontinued daily updates. We will restart the data stream as soon as possible.

Some people might ask why we don’t simply switch to the EOS AMSR-E sensor. AMSR-E is a newer and more accurate passive microwave sensor. However, we do not use AMSR-E data in our analysis because it is not consistent with our historical data. Thus, while AMSR-E gives us greater accuracy and more confidence on current sea ice conditions, it actually provides less accuracy on the long-term changes over the past thirty years. There is a balance between being as accurate as possible at any given moment and being as consistent as possible through long time periods. Our main scientific focus is on the long-term changes in Arctic sea ice. With that in mind, we have chosen to continue using the SSM/I sensor, which provides the longest record of Arctic sea ice extent.

56 responses to “NSIDC: satellite sea ice sensor has “catastrophic failure” - data faulty for the last 45 or more days”

18 02 2009
John Egan (22:29:11) :
Will NSIDC issue a correction to the media?
“Arctic sea ice coverage was at its sixth lowest January extent since satellite records began in 1979, according to the National Snow and Ice Data Center. Average ice extent during January was 5.43 million square miles.”
This was released in a number of news outlets -

examiner.com
And was also part of the larger NOAA January report -
noaanews.noaa.gov
18 02 2009
VG (23:14:32) :
Re Previous it is however a bit of a worry that cryosphere today puts this on top of their web page (see below in parenthesis) It shows a bias towards any mention that ice may be close to normal especially in light of recent NSIDC problems. This is one site which I would have trouble with just becaue of this. They should just put the data up and not put comments like this. It actually does a disservice to their “global warming” cause.. but on the light side, being a skeptic I applaud it! LOL
“February 15, 2009
In an opinion piece by George Will published on February 15, 2009 in the Washington Post, George Will states “According to the University of Illinois’ Arctic Climate Research Center, global sea ice levels now equal those of 1979.”
We do not know where George Will is getting his information, but our data shows that on February 15, 1979, global sea ice area was 16.79 million sq. km and on February 15, 2009, global sea ice area was 15.45 million sq. km. Therefore, global sea ice levels are 1.34 million sq. km less in February 2009 than in February 1979. This decrease in sea ice area is roughly equal to the area of Texas, California, and Oklahoma combined.
It is disturbing that the Washington Post would publish such information without first checking the facts.
19 02 2009
Mike D. (00:49:41) :
On February 16, 2009, as emails came in from puzzled readers, it became clear that there was a significant problem
Kudos to ICECAP and WUWT. Citizen scientist bloggers discovered and reported the erroneous readings. That is pretty cool. Thanks to the Internet, science is becoming a more public undertaking, a less esoteric and hidden away in laboratories process. That’s the trend, anyway, and it’s a very healthy one, IMHO.
Thank you, Anthony, for being a leader in this new wave, this new gestalt of science.
wattsupwiththat.com



To: Sam who wrote (5046)2/25/2009 1:56:50 PM
From: Brumar89  Read Replies (2) | Respond to of 86356
 
George Will: climate criminal or brave but sloppy iconoclast?

— Fabius Maximus @ 12:01 am

Summary: Pundit George Will published a sloppily researched and composed column about global warming in the Washington Post. The response was a deafening call for his execution (i.e., of his career). Through a stroke of luck so great it must be intervention of the Blue Fairy, he may have accidentally stated the situation correctly. This episode, esp the reaction of his critics, illustrates important aspects of decision-making in 21 century America.

The subtitle for this post: Tonight’s prayer is ”let me be so lucky as George Will.”

Contents

About “Dark Green Doomsayers“, George F. Will, Washington Post, 15 February 2009
“Off with his head” scream the green defenders of the faith
The Blue Fairy intervenes, and the National Snow and Ice Data Center confesses
About Will’s other errors
What have we learned from this?
This post is a follow-up to The media doing what it does best these days, feeding us disinformation (18 February), about Michael Asher’s article which kicked off this debate.

(1) George Will, the sloppy pundit

The critics focused on this paragraph:

As global levels of sea ice declined last year, many experts said this was evidence of man-made global warming. Since September, however, the increase in sea ice has been the fastest change, either up or down, since 1979, when satellite record-keeping began. According to the University of Illinois’ Arctic Climate Research Center, global sea ice levels now equal those of 1979.

There are several things wrong with this text. First and worst, he is using without attribution the work of another: “Sea Ice Ends Year at Same Level as 1979“, Michael Asher, Daily Tech, 9 January 2009 (per the WaPo ombudsman here). Second, Will inaccurately repeats Asher’s conclusion.

Asher’s says “now” in an article published 1 January — meaning December data. A relevant authority confirmed this: Cryosphere Today, published by the Dept of Atmospheric Sciences at the U of IL (see here for an analysis of this article). Will says “now” in an article published 15 February, without determining if the data has changed. It had. Cryosphere today posted a rebuttal on the same day (it was here, but since has been erased).

In an opinion piece by George Will published on February 15, 2009, in the Washington Post, George Will states, “According to the University of Illinois’ Arctic Climate Research Center, global sea ice levels now equal those of 1979.”

We do not know where George Will is getting his information, but our data show that on February 15, 1979, global sea ice area was 16.79 million sq. km and on February 15, 2009, global sea ice area was 15.45 million sq. km. Therefore, global sea ice levels are 1.34 million sq. km less in February 2009 than in February 1979. This decrease in sea ice area is roughly equal to the area of Texas, California, and Oklahoma combined.

It is disturbing that the Washington Post would publish such information without first checking the facts.

(2) “Off with his head” scream the green defenders of the faith

Retribution was swift.

(a) From hilzoy (described as a ”philosophy professor who specializes in ethics”), posted at Obsidian Wings:

“All those people who supposedly fact-checked Will’s article as part of the Post’s “multi-layer editing process” — “people [George Will] personally employs, as well as two editors at the Washington Post Writers Group, which syndicates Will; our op-ed page editor; and two copy editors” — should be fired, either for not doing their job or for doing it utterly incompetently.”

From Brad Delong (Professor of Economics at Berkeley), “Washington Post Crashed-and-Burned Watch“, at his website Grasping Reality with Both Hand, 20 February 2009 — About the WaPo’s ombudsman, who dared to provide evidence supporting George Will:

“Can you provide me with any reason why Mr. Alexander should not be immediately fired from the Washington Post for not doing his job to speak truth to editors, reporters, and readers?”

In case anyone missed his message, later that day he posted “Fire Washington Post Ombudsman Andy Alexander This Morning“

“The latest Washington Post employee to show that he has no business at all in journalism is ‘ombudsman’ Andy Alexander–who should be run out of town this morning, if not sooner.”

This is vintage Delong. Like a medieval religious fanatic yelling for heretics to be burnt, he urges punishment of heterodox thoughts or deeds. That same day he writes another post saying that Berkeley should be “Firing John Yoo” (Professor of Law, worked in the Dept of Justice 2001-2003; see Wikipedia).

(3) The Blue Fairy intervenes; the National Snow and Ice Data Center confesses

Right as George Will was stepping into the furnace, non-credentialed scientists noticed oddities in the National Snow and Ice Data Center’s (NSIDC) daily record of arctic sea ice.

NSIDC makes a big sea ice extent jump - but why?, Anthony Watts, at Watts Up with That, 16 February 2009
Once told about the problem the NSIDC quickly acted. Walt Meier (Research Scientist at NSIDC) courteously replied to Anthony Watt.

“We’re looking into it. For the moment, we’ve removed the data from the time series plot. … I’m not sure why you think things like this are worth blogging about. Data is not perfect, especially near real-time data. That’s not news.”

Watt thought that this was important, as described in Errors in publicly presented data - Worth blogging about?, 16 February. He was rapidly proven correct.

Satellite sensor errors cause data outage, NSIDC, 18 February 2009 — Excerpt:
“As some of our readers have already noticed, there was a significant problem with the daily sea ice data images on February 16.
The problem arose from a malfunction of the satellite sensor we use for our daily sea ice products. Upon further investigation, we discovered that starting around early January, an error known as sensor drift caused a slowly growing underestimation of Arctic sea ice extent. The underestimation reached approximately 500,000 square kilometers (193,000 square miles) by mid-February.”

This refers to one channel of the F13 Special Sensor Microwave/Imager (SSM/I) of the Defense Meteorological Satellite Program (DMSP), one of the two satellites used to track polar sea ice. Astonishingly, even the mainstream media picked up the story.

“Arctic Sea Ice Underestimated for Weeks Due to Faulty Sensor“, Bloomberg, 20 February 2009 — The media picks up the story.
On 17 February The Cryosphere Today posted an enigmatic acknowledgement of the problem.

“The SSMIsensor seems to be acting up and dropping data swaths from time to time in recent days. Missing swaths will appear on these images as a missing data in the southern latitudes. If this persists for more than a few weeks, we will start to fill in these missing data swaths with the ice concentration from the previous day. Note - these missing swaths do not affect the timeseries or any other plots on the Cryosphere Today as they are comprised of moving averages of at least 3 days.”

Eventually they will provide more specific information. They have, however, removed from their home page the notes about the Michael Asher and George Will articles.

As yet we do not know the end of the story. The Cryosphere Today rebuttal to Will’s column specifically used the February 15 data on sea ice extent. It seems likely that this estimate will be revised downward, perhaps sufficiently to make Will’s statement (accidentally) close. Using the NSIDC est error of 500,000 kilometers, Feb 2009 is aprox 5% less than Feb 1979 (an annual decrease of 0.16% point to point, statistically zero).

If so, will all these people apologize for their their harsh words? More importantly, will they tell their readers that in fact global sea ice was unchanged as George Will said?

(4) About Will’s other errors: sloppy writing attacked by sloppy critics

As usual when attacking global warming heretics, the critics give vicious rebuttals to Will’s errors, both real and imagined. Some of them are just made up, attributing to him things he never said. Sloppy, just like George Will. Look at Delong’s comment:

Will claimed the note (here, from Cryosphere Today} said that sea ice changes since 1979 do not provide evidence of global warming. The note says the opposite: that the shrinkage of arctic and (smaller) expansion of antarctic sea ice is evidence of global warming.

That’s incorrect on two levels. Will said that “global sea ice levels now equal those of 1979.” The Cryosphere Today note says:

“Observed global sea ice area, defined here as a sum of N. Hemisphere and S. Hemisphere sea ice areas, is near or slightly lower than those observed in late 1979?.
“Recent decreases of N. Hemisphere summer sea ice extent are consistent with” global climate model projections.
The first is discussed above. Delong’s re-statement of the second is bizarre: that a model accurately match the past (aka back tests) “proves” nothing (unlike Delong, Cryophere Today carefully avoids saying “prove”, or comparing current sea ice data with model projections made 10 or more years ago).

Moving on, most of this (like Delong’s agitprop) is too tedious to rebut (another example here). But IMO one is worth discussion. Pundits write short articles (750 words in this case) about big things. That’s more difficult than the usual drill on this site, long articles (1000 - 2000 words) with a tight focus. So he compresses things, which allows critics to deliberately misinterpret him — and makes sloppy mistakes too easy. Here Will does both.

In the 1970s, “a major cooling of the planet” was “widely considered inevitable” because it was “well established” that the Northern Hemisphere’s climate “has been getting cooler since about 1950? (New York Times, May 21, 1975). Although some disputed that the “cooling trend” could result in “a return to another ice age” (the Times, Sept. 14, 1975), others anticipated “a full-blown 10,000-year ice age” involving “extensive Northern Hemisphere glaciation” (Science News, March 1, 1975, and Science magazine, Dec. 10, 1976, respectively).

The first part is a simple statement of fact, that there was considerable debate about climate change trends in the 1970’s (as there is today), as shown by his quotes from major media. Critics misread this (like here; ask in the comments if you would like additional discussion). The second, “others anticipated a full-blown 10,000 year ice age’”, is a gross error about a classic Science article “Variations in the Earth’s Orbit: Pacemaker of the Ice Ages” J. D. Hays, John Imbrie, N. J. Shackleton, 10 December 1976.

(5) What have we learned from this?

(a) Science data, esp real-time data, is subject to big revisions.

We this that here with the recent global sea ice data. At some point IMO the surface temperature records will be “audited” and substantially revised on all levels. The sampling, adjustments for changes in sites and the urban heat island effect, and data quality. The result might look very different than it does today. For more about this see “United States and Global Data Integrity Issues“, Joseph D’Aleo, Science and Public Policy Institute, 29 January 2009 (28 pages).

(b) Be careful when criticizing the green religion

Saying terrible things about Jesus is OK (”Piss Christ” was in part funded by us), but be careful when questioning green orthodoxy. The true believers will not only mis-represent what you say in their rebuttals, but also try and get you fired. They have no respect for truth or logic. That’s how the game is played in 21st Century America.

(c) The public climate change debate is mostly dueling hacks

It would take only a few hours for a competent statistician to determine the trend(s) - if any - in the global sea ice record, with an estimate of statistical significance. Given the number of long cycles in the Earth’s climate (e.g., the Pacific decadal oscillation), the 30 years of satellite data tell us little. But a competent statistical analysis would tell us more than anything seen in the current debate about sea ice.

There is probably some relevant analysis in the climate science literature. If so, it would be nice to see that cited rather than the nonsense described above that clogs the mainstream media and Internet.

fabiusmaximus.wordpress.com