Global Temperature Report: December 2013

2013 was 4th warmest year in the satellite era

From University of Alabama, Hunstville.

Dec2013graph (1)

Global climate trend since Nov. 16, 1978: +0.14 C per decade

December temperatures (preliminary)

Global composite temp.: +0.27 C (about 0.49 degrees Fahrenheit) above 30-year average for December.

Northern Hemisphere: +0.27 C (about 0.49 degrees Fahrenheit) above 30-year average for December.

Southern Hemisphere: +0.26 C (about 0.47 degrees Fahrenheit) above 30-year average for December.

Tropics: +0.06 C (about 0.11 degrees Fahrenheit) above 30-year average for December.

November temperatures (revised):

Global Composite: +0.19 C above 30-year average

Northern Hemisphere: +0.16 C above 30-year average

Southern Hemisphere: +0.23 C above 30-year average

Tropics: +0.02 C above 30-year average

(All temperature anomalies are based on a 30-year average (1981-2010) for the month reported.)

Global map for December:

Dec2013map

For the year:

2013map

Notes on data released Jan. 3, 2014:

2013 was the fourth warmest year in the satellite era, trailing only 1998, 2010 and 2005, according to Dr. John Christy, a professor of atmospheric science and director of the Earth System Science Center at the University of Alabama in Huntsville. The warmest areas during the year were over the North Pacific and the Antarctic, where temperatures for the year averaged more than 1.4 C (more than 2.5 degrees Fahrenheit) warmer than normal. There were small areas of cooler than normal temperatures scattered about the globe, including one area over central Canada where temperatures were 0.6 C (about 1.1 degrees Fahrenheit) cooler than the 30-year norm.

Global average temperature

(Departures from 30-year norm, degrees C)

1. 1998   0.419

2. 2010   0.398

3. 2005   0.260

4. 2013  0.236

5. 2002   0.218

6. 2009   0.209

7. 2007   0.204

8. 2003   0.187

9. 2006   0.186

10. 2012   0.170

11. 2011   0.130

12. 2004   0.108

13. 2001   0.107

14. 1991   0.020

15. 1987   0.013

16. 1995   0.013

17. 1988   0.012

18. 1980  -0.008

19. 2008  -0.009

20. 1990  -0.022

21. 1981  -0.045

22. 1997  -0.049

23. 1999  -0.056

24. 1983  -0.061

25. 2000  -0.061

26. 1996  -0.076

27. 1994  -0.108

28. 1979  -0.170

29. 1989  -0.207

30. 1986  -0.244

31. 1993  -0.245

32. 1982  -0.250

33. 1992  -0.289

34. 1985  -0.309

35. 1984  -0.353

Compared to seasonal norms, in December the warmest area on the globe was the northeastern Pacific Ocean, where the average temperature for the month was 4.91 C (about 8.8 degrees F) warmer than seasonal norms. The coolest area was in central Manitoba, near Lake Winnipeg, where temperatures in the troposphere were 5.37 C (almost 9.7 degrees F) cooler than seasonal norms.

Archived color maps of local temperature anomalies are available on-line at:

http://nsstc.uah.edu/climate/

As part of an ongoing joint project between UA Huntsville, NOAA and NASA, Christy and Dr. Roy Spencer, an ESSC principal scientist, use data gathered by advanced microwave sounding units on NOAA and NASA satellites to get accurate temperature readings for almost all regions of the Earth. This includes remote desert, ocean and rain forest areas where reliable climate data are not otherwise available.

The satellite-based instruments measure the temperature of the atmosphere from the surface up to an altitude of about eight kilometers above sea level. Once the monthly temperature data is collected and processed, it is placed in a “public” computer file for immediate access by atmospheric scientists in the U.S. and abroad.

Neither Christy nor Spencer receives any research support or funding from oil, coal or industrial companies or organizations, or from any private or special interest groups. All of their climate research funding comes from federal and state grants or contracts.

— 30 —

Dr. Roy Spencer’s report:

The Version 5.6 global average lower tropospheric temperature (LT) anomaly for December, 2013 is +0.27 deg. C, up from +0.19 deg. C in November (click for full size version):

UAH_LT_1979_thru_December_2013_v5.6

The global, hemispheric, and tropical LT anomalies from the 30-year (1981-2010) average for the last 12 months are:

YR MON GLOBAL NH SH TROPICS

2013 01 +0.496 +0.512 +0.481 +0.387

2013 02 +0.203 +0.372 +0.033 +0.195

2013 03 +0.200 +0.333 +0.067 +0.243

2013 04 +0.114 +0.128 +0.101 +0.165

2013 05 +0.082 +0.180 -0.015 +0.112

2013 06 +0.295 +0.335 +0.255 +0.220

2013 07 +0.173 +0.134 +0.211 +0.074

2013 08 +0.158 +0.111 +0.206 +0.009

2013 09 +0.365 +0.339 +0.390 +0.189

2013 10 +0.290 +0.331 +0.250 +0.031

2013 11 +0.193 +0.160 +0.226 +0.020

2013 12 +0.265 +0.273 +0.257 +0.057

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MattN
January 3, 2014 8:34 pm

Why is the trend still .14C? There’s been very little warming for well over a decade now. It was .14C years ago, we’ve had virtually no warming, and its still .14C. I don’t understand.

January 3, 2014 8:41 pm

No doubt the work from UAH, Dr. John Christy and Dr. Roy Spencer is opposed by global warming proponents!
I take a look at the UAH – Global lower tropospheric temperature anomalies, 1979 thru December 2013, relative to 1981 thru 2010 [The red curve is the running, centered 13-month average] and all I see is that after 1998 the global temperature anomaly rose some to 0.2°C.
and has stayed around there since 2002. Then I think most probably the big 1998 El Niño did that.
If this temperature pause by whatever name gives way to warming or to cooling, I think is to be resolved by ENSO. This is because ENSO is a mechanism for regulating the planet’s energy input from the Sun. The clouds associated with it are the throttle, so to speak.
Mostly water vapor and much less so CO2 play their warming and cooling roles in the chaotic planetary weather system. This weather system includes some features that work as internal regulators for the heat engine that takes heat from the tropics to the poles and out to space.
One thing that is not clear is how much CO2 is caused by human activities, how much by volcanic remnants and many other natural sources.
Another unclear factor is how much warming would come from a duplication of the present CO2 mix in the atmosphere (the “climate sensitivity”), ask the the IPPC? They don’t know. Many well-known climate scientists (Dr, Spencer among them) think this is a figure near 1°C. Many other think higher figures due to a net positive feedback in the climate system.
One thing is very clear though; without CO2 we, or the plants and animals we eat would not be here to spin this tale.

richardscourtney
January 3, 2014 8:51 pm

Joe:
Your post at January 3, 2014 at 7:54 pm says in total

“Please, James. You confuse the IPCC’s narrative with real science. Maybe the IPCC tried to be scientific in AR-1, but like Snow White, they drifted.”

Dbstealey, who exactly are you? What have you published? Why should your opinion have more weight than that of the many actual scientists that contributed to the IPCC?

Dbstealey is a person who puts his name to his posts whereas you post anonymously while demanding to know who he is. Talk about brass-neck!
And who he is, what he has done and/or what he has written is not relevant.
Only the truth of what he has said is worthy of assessment.
And what he has said is stated – indeed, it is defined – in the IPCC’s own documents.
It is the custom and practice of the IPCC for all of its Reports to be amended to agree with the political summaries. The facts are as follows.
The Summary for Policymakers (SPM) is agreed “line by line” by politicians and/or representatives of politicians, and it is then published. After that the so-called ‘scientific’ Reports are amended to agree with the SPM. This became IPCC custom and practice of the IPCC when prior to its Second Report the then IPCC Chairman, John Houghton, decreed,

We can rely on the Authors to ensure the Report agrees with the Summary.

This was done and has been the normal IPCC procedure since then.
So, as Db stealey says,

Maybe the IPCC tried to be scientific in AR-1

But it has not been since the practice of the IPCC has been for its so-called ‘science’ to be adjusted to agree with the views of politicians.
This custom and practice enabled the infamous ‘Chapter 8′ scandal so perhaps it should – at long last – be changed. However, it has been adopted as official IPCC procedure for all subsequent IPCC Reports.
Appendix A of the present Report (the AR5) states this where it says.

4.6 Reports Approved and Adopted by the Panel
Reports approved and adopted by the Panel will be the Synthesis Report of the Assessment Reports and other Reports as decided by the Panel whereby Section 4.4 applies mutatis mutandis.

This is completely in accord with the official purpose of the IPCC.
The IPCC does NOT exist to summarise climate science and it does not.
The IPCC is only permitted to say AGW is a significant problem because they are tasked to accept that there is a “risk of human-induced climate change” which requires “options for adaptation and mitigation” that can be selected as political polices and the IPCC is tasked to provide those “options”.
This is clearly stated in the “Principles” which govern the work of the IPCC. These are stated at
http://www.ipcc.ch/pdf/ipcc-principles/ipcc-principles.pdf
Near its beginning that document says

ROLE
2. The role of the IPCC is to assess on a comprehensive, objective, open and transparent basis the scientific, technical and socio-economic information relevant to understanding the scientific basis of risk of human-induced climate change, its potential impacts and options for adaptation and mitigation. IPCC reports should be neutral with respect to policy, although they may need to deal objectively with scientific, technical and socio-economic factors relevant to the application of particular policies.

This says the IPCC exists to provide
(a) “information relevant to understanding the scientific basis of risk of human-induced climate change”
and
(b) “options for adaptation and mitigation” which pertain to “the application of particular policies”.
Hence, its “Role” demands that the IPCC accepts as a given that there is a “risk of human-induced climate change” which requires “options for adaptation and mitigation” which pertain to “the application of particular policies”. Any ‘science’ which fails to support that political purpose is ‘amended’ in furtherance of the IPCC’s Role.
This is achieved by amendment of the IPCC’s so-called ‘scientific’ Reports to fulfil the IPCC’s political purpose by politicians approving the SPM then the IPCC lead Authors amending the so-called ‘scientific’ Reports to agree with the SPM.
All IPCC Reports including the IPCC AR5 are pure pseudoscience intended to provide information to justify political actions; i.e.Lysenkoism. And – as Dbstealey says – this has been true for every IPCC so-called ‘scientific’ Report following its First Report.
Or perhaps you want to dispute that the IPCC Reports are in accord with the IPCC’s own stated customs and practices as defined in the IPCC’s own documents?
Richard

January 3, 2014 8:55 pm

7:54, seeing as how you asked.
You are?
Your “credentials”?
Arguing the authority of your experts is greater than his experts is religion and circular noise.
How about that old tool called the scientific method?
Define your theory?
Is it CAGW (due to CO2)?
If so, how about you lay out empirical data that appears to support your theory.
Demonstrate how you used it to test your idea.Full methodology please.
Explain what measurements might falsify this theory.
And of course: how does your theory contradict the null hypothesis?
Is there any measured “global” warming that is unusual compared to past cycles? Feel free to use the IPCC version.. Oh wait, they have never been able to do that…
So if you would be so kind…. you will find the UN eternally grateful, a Nobel prize thrust upon you, and the academic gravy train for life.

Rob aka flatlander
January 3, 2014 9:25 pm

Nice one John Robertson, and please Joe please point out scientifically how this data means anything. With respect to the 30 trend line it appears to have a jump of .3 deg C in 2002. It’s was fluctuating at -0.1 till then and then moves up to +0.2 deg and hovers there from 2002 to 2013
Wondering if there was one of thier normally upward data “corrections” in 2002

juan slayton
January 3, 2014 9:27 pm

RockyRoad: I’ve seen estimates that the rise in CO2 over the past 50 years has been responsible for a 15% increase in foodstuff production worldwide.
I’ve been looking for something to back up these numbers. Can you throw us a link?

Rob aka flatlander
January 3, 2014 9:43 pm

Joe says:
Why should your opinion have more weight than that of the many actual scientists that contributed to the IPCC?
Joe
I have a question for you? Have you actually researched the expertise and the credentials of those “scientists” that contributed to the IPCC data analysis and reports? You might be surprised if you did.
A phd stuck to the end of your name neither makes you an expert or not an expert. Usually a phd means you know more and more of less and less
Your field tightens with smaller and smaller focus.
Read read read my friend and trust neither side of this debate, trust in the info and data that you can gather. If you don’t then you as the mass of people accept blindly what is sold to them.
Anyone who blindly accepts what a group that is heavily funded to say one thing is setting themselves up for twisted info. What is the difference between “big oil” info and “big government” info that bureaucrats need to ride thier gravy train.
I question ALL of it.

richardscourtney
January 3, 2014 9:53 pm

Rob aka flatlander:
re your post at January 3, 2014 at 9:43 pm.
Please inform on how to obtain some of the “big oil” funding which you imply exists.
I want some.
Roy Spencer (who provides the above global temperature data) wants some.
Anth0ny W@tts has said he wants some.
And Bob Tisdale needs some.
Thanking you in anticipation.
Richard

January 3, 2014 10:12 pm

Richard M says:
January 3, 2014 at 7:39 pm
1) Has anyone determined what caused the huge January 2013 anomaly?
I certainly do not have the complete answer, but take a look at the following where sea surface temperatures are plotted along with RSS since July 2012. More often than not, the trends are in opposite directions. It seems logical that when sea surface temperatures drop, there is a lot of evaporation going on which takes a lot of heat. And what happens to this heat? The water vapor combines in the atmosphere to form liquid water and the troposphere warms as recorded by RSS.
http://www.woodfortrees.org/plot/hadsst3gl/from:2012.5/plot/rss/from:2012.5

juan slayton
January 3, 2014 10:24 pm

richardscourtney: Please inform on how to obtain some of the “big oil” funding which you imply exists.
Glad you asked. Here’s how: Retire with almost any of the major government retirement plans. My own (CALSTRS), as of last June 30, held $1,150,537,000 worth of Exxon-Mobile securities, along with $72,213,000 worth of Valero.
The point: while many (not all) of the alarmists are painting fossil fuel industries as destructive producers of ill-gotten profits, they at the same time continuously benefit from the industry’s products, and large numbers of them share in those profits. (And for those who do not have such plans, be informed that in California, should the CALSTRS investments fail to finance the system’s obligations, it will be the responsibility of the general taxpayer to make up the difference.)

January 3, 2014 10:40 pm

Although not a perfect analogy, when someone starts ranking warm years as proof of CAGW, I point out that for the last 17 years of my life, my height is ranked the highest in 55 years, but that doesn’t mean I suffer from gigantism. If I go back 45 years to the present, I can show a linear trend showing growth, even though I stopped growing when I hit 18. Do I need to start buying longer suits? I don’t think so…
You know the CAGW scam is over when Warmunists are relegated to ranking years and trying to scare people about ocean pH and Arctic’s seasonal ice melt.
The majority of climate models will soon or already are exceeding 2 standard deviations from observations for sufficiently long enough time periods to scientifically disconfirm the CAGW hypothesis.
With the complete collapse of the EU Carbon Exchange and the total collapse of the wind/solar industry, the market has already decided CAGW is dead. The only things keeping this charade going are leftist MSM and leftist politician propaganda.
Once these last two bastions of BS stop propagandizing CAGW, the CAGW grants will end and then the “scientific” community will lose interest and move on to the next crisis to extort (back to manmade cooling??).
The beginning of the end of CAGW is near.

January 3, 2014 10:48 pm

MattN says:
January 3, 2014 at 8:34 pm
Why is the trend still .14C? There’s been very little warming for well over a decade now. It was .14C years ago, we’ve had virtually no warming, and its still .14C. I don’t understand.
There are three reasons that I can think of.
1. Up to the end of 2010, which was a very hot year, the slope was 0.01475/year according to version 5.5. But the most recent value is 0.0135975/year, which is lower, but rounds up to 0.14/decade.
2. When a hot year nudges the slope up, it takes a few average years to get it back down again, and 3 years in about 34 years is less than 10%.
3. The earlier slope was based on version 5.5. The new version is 5.6 which shows a higher slope. For example, the time for no warming on version 5.6 is since August 2008, but the time for no warming on version 5.5 is from January 2005.

January 3, 2014 10:53 pm

Jim Roth says:
January 3, 2014 at 3:29 pm
Can someone please tell me how this squares with the idea that there’s been no global warming for the last 17 yr’s?
On RSS there is no warming for 17 years and 4 months. As to why there is such a big difference between RSS and UAH is a huge mystery. Perhaps UAH is measuring the Antarctic too high.

tobias smit
January 3, 2014 10:54 pm

rivhardcourtney; Rob aka flatlander:
re your post at January 3, 2014 at 9:43 pm., I want some too! (that is those wicket oil $$$, I have given them enough of my own as has James as he pounds away on his plastic key board)
Pamela grey , oh yes ours (in the veggie patch) had a bad go of it . But our grapes (on the Farm ) thankfully recovered after a really bad wet spring, Oh and BTW I am (almost) starting to feel sorry for some of the warmists . Your and others WUWT are educating a lot of us non climatologists ( ok in other fields) and I thank you all for that, Sorry to hear BT has to curtail his work.

dp
January 3, 2014 10:56 pm

Mosher – are you willing to predict and put money up that observed temperatures will soon begin to match at least 51% of the models that are currently fueling the climate warming scare machine?

Paul Pierett
January 4, 2014 12:02 am

If man were warming up the EARTH, should not this year be the warmest?
If the Earth was warming up because of man, should not the hurricane seasons be getting stronger?
If man was warming up the Earth, should not Glaciers have melted away by now?
If man was warming up the Earth there should not be a debate.

Paul Pierett
January 4, 2014 12:19 am

Just took a look at last winter’s numbers 2012 was the 8th warmest on Earth. I wouldn’t take the report to the bank yet.

Bob Grise
January 4, 2014 12:25 am

You look at all this massive ice at the poles and all that mass of water in the oceans and then do some math. The population of man per square mile of Earth is only 35, or one person per 18 acres. How the heck did that influence climate, or the amount of ice at the poles in any given year? It can’t be possible. This is nature at work. Natural variation. We have very little to no control.

Gareth Phillips
January 4, 2014 1:15 am

Txomin says:
January 3, 2014 at 6:06 pm
Phillips
I thought the point was that CO2 is responsible for accelerated warming and that it must be reduced because its causing catastrophic climate change. Please point at the catastrophic climate change in the graph.
@TXOMIN Thanks for that. The idea is that a continued increase in temperature will cause serious problems in our environment. What the nature of those problems is and the extent are of course open to debate. The interpretation of data is a lot more subjective than most people realise. If you look at the temperature record you may be reassured because of your background beliefs in how science works, but change the name of the data from temperature to unemployment figures. If that had been your countries record on employment would you be concerned or re-assured that the upward trend had flattened off?

Billmelater
January 4, 2014 1:32 am

Good explanation to explain the increase in the Earth’s temperature. Sixty year cycle. Who ever dreamt that one up should get a Nobel prize for creativity. Still the evidence is getting harder to refute and greater creativity will be needed to explain it away.

Eliza
January 4, 2014 1:37 am

The satellite record is meaningless as far a global trends are concerned. The time span is ridicously short 30 years.

Ronald
January 4, 2014 2:35 am

J Abbott,
Classic AGW, and thus showing no competence to the matter.
99% of the skeptics know that CO2 is a greenhouse gas and is warming the planet. But the important question is by how much. And we skeptics know that’s very little. In fact you could know it yourself by a test, you probably know, to scare the crap out of students. You know the experiment with the 2 closed boxes and the light bulbs? Yes you know and you love it because it proves you’re right; wrong. In 1 box there is 100% CO2 and in the other 100% air with 0,4% CO2. If the result for 100% CO2 is 6 you can calculate what 0,4% CO2 does. Thats 0,004%, wrong again. CO2 radiates only 8% of the warming back and 5% of that goes back to earth. So the number is even lower.
Now I talk about CO2 as a total, humans do only 4% of all CO2 so we humans do only 0,00012 degrees C warming. This is all sciences and can be found on line so look for it your self.
Then your question. What would happen if CO2 was 0. You have the answerer from above, even with CO2 at 400 PPM the effect is almost 0.
But to go along with your twisted thinking. You would never find the answer to that because you assume CO2 is the big driver. And even if I tell you the truth, you could not find it because of your problems.
You see you and your colleges made sciences rotten to the bone. You work with models which give you GIGO results because of the garbage in garbage out problem. And the fact that you focus on just one outcome, namely CO2, is to blame.
If you want the answer you must work with real non-adjusted raw data. Work with a clear model and overall look at real life and not your fantasia bogus AGW world.
You would see that there is an relation an domino effect so to speak in which there are parts of the system we now as climate you must have but there is one we can get without.
This is the main reason why it won’t work for you.
Sun, Ocean, humidity, temperature.
This is how climate works.
The sun warms the planet, 75% off the planet is ocean so a warming ocean means more moisture. The main greenhouse gas is water vapor with 95% so more water vapor makes a warmer planet, bit tricky because water vapor has also a cooling effect. To see what impact water vapor has on the temperature you can go to the tropics. There you can learn how it works and there you see the climate optimum in full spin. And you can go to any desert to see how less water vapor works and what effect that has.
After water vapor comes temperature. The more water vapor the higher the temperature and also less water vapor means lower temperature. I left out CO2 because it doesn’t have a place in the climate. CO2 comes after the temperature and in fact is only the result of temperature but that also is not the whole truth. CO2 comes (among other ways but this is the big way) in the atmosphere by out gassing from the ocean. See the sun warms the ocean surface and thus CO2 is re least because warm water can hold less CO2 then cold water.
By the IPCC I know there is less water vapor in the atmosphere then say 15 years ago. So what could that be?
Sun, ocean, humidity, temperature.
We know that the sun is in SC 24 and that a weak one. So the sun warms the planet less then say 30 year before. Less warmth from the sun makes a colder surface makes less humidity makes lower temperatures.
In this case again CO2 has no effect what so ever. After the temperature drops we will see CO2 drop because of the colder oceans absorbing more CO2. The fun fact is that is will take some time. 10, 20, 100 years we don’t really know that.
So Abbott you could know this if you worked science in fact you would know if you worked real data instead of adjusted data. You commit a fraud and are stuck in the fraud so you never find the answer.
The only way to go is back to real life. But be prepared of the shock.

RichardLH
January 4, 2014 2:46 am

Billmelater says:
January 4, 2014 at 1:32 am
“Good explanation to explain the increase in the Earth’s temperature. Sixty year cycle. Who ever dreamt that one up should get a Nobel prize for creativity. Still the evidence is getting harder to refute and greater creativity will be needed to explain it away.”
There are many 60 year calendars in history and it has often been speculated that there may be some relevance in that to climate and weather. Our ancestors were very good at observations, explanations often rather less so.
In my case it was not that I looked for a 60 year cycle but rather, when using a common methodology to determine what cycles may or may not be present in a time series data set (i.e. a simple low pass filter) that the 60 year cycle popped out of the HadCrut4 data.
http://www.woodfortrees.org/plot/hadcrut4gl/plot/hadcrut4gl/mean:220/mean:174/mean:144/plot/hadcrut4gl/mean:720
Starting to be visible in the UAH (and RSS) data as well now but the series are not quite long enough yet to be sure.
http://www.woodfortrees.org/plot/uah/plot/uah/mean:84/mean:70/mean:58
Using data projections (in the same way that is done for the CET series) so that you get some idea of likely futures you then get this
http://snag.gy/iychw.jpg
The simple facts are that there is not enough data yet to make a determination. But it is starting to look as though there will be enough soon.
Based on the above data analysis I have suggested that next years temperatures will be lower (on average) than this years. Should be confirmable (or not) in only a years time 🙂
It all comes down to how you believe that the series extends given its history to date.

William Astley
January 4, 2014 2:51 am

In support to Badger’s comment:
Badger says:
January 3, 2014 at 7:29 pm
For the life of me, I don’t understand how climate scientists and their religious supporters can spout the CO2 nonsense. My doctoral thesis in 1989 (in Engineering Mechanics) involved the use of an infrared camera, so I had to become acutely aware of the IR absorption characteristics of atmospheric gases. …
William: Your comment is correct. The warming affect of CO2 in the lower troposphere is greatly reduced due to the overlap of the absorption of frequencies of H20 and CO2. The following paper provides an overview of the theory.
http://www.warwickhughes.com/papers/barrett_ee05.pdf
Higher in the troposphere there is less water so theoretically if all conditions/atmospheric processes were/are modelled correctly there should be the most warming due the increase in atmospheric CO2.
The anomaly or paradox is that there is 100% to 300% less warming than expected in the upper troposphere which obviously indicates there are multiple fundamental errors or emissions in the general circulation models (GCM) used by the IPCC. The GCM predict that the most amount of warming in the planet due to the increase in atmospheric CO2 should have occurred in the tropics (where there is the most amount of long wave radiation emitted to space) at 8km above the surface of the planet. There is slight cooling observed at that altitude rather than warming.
http://icecap.us/images/uploads/DOUGLASPAPER.pdf
A comparison of tropical temperature trends with model predictions
We examine tropospheric temperature trends of 67 runs from 22 ‘Climate of the 20th Century’ model simulations and try to reconcile them with the best available updated observations (in the tropics during the satellite era). Model results and observed temperature trends are in disagreement in most of the tropical troposphere, being separated by more than twice the uncertainty of the model mean. In layers near 5 km, the modelled trend is 100 to 300% higher than observed, and, above 8 km, modelled and observed trends have opposite signs. These conclusions contrast strongly with those of recent publications based on essentially the same data.

Billmelater
January 4, 2014 2:59 am

RichardLH, what do you think is driving the cycle?

1 5 6 7 8 9 17