This is some nice amateur climatology, is it your work or from else where?
Unfortunately you seem to have fallen for several common pitfalls. Firstly you will have to revise your analysis as HadCRUT3 was recently adjusted to correct for an error in data processing and the "nose dive" you speak of has all but vanished: http://hadobs.metoffice.com/hadcrut3/diagnostics/global/nh+sh/
Also if you look at any other metric, such as GISTEMP form NASA, the cooling you claim is essentially non-existant.
Secondly you need to work on your statistics - fitting a 4th order polynomial would be fine if there was some evidence that the climate was a 4th order polynomial system - which there isn't. I am guessing the intent of the 4th order fit is to exaggerate your alleged "cooling trend".
You also completely overlooked any sort of uncertainty estimates. If you look at the actual data from the Hadley center you will notice two things. The first is that the "cooling trend" (ie the last 2 years being cooler than the two before those) is about 0.02C. However the 2 sigma error bars in the data set are about +/- 0.1C. A "trend" that is 5 times smaller than the uncertainty is not a trend, it is statistically meaningless. You also forgot to put error bars in your model comparison - if you did you would notice that the error bars include almost ALL the model projections. Finally a 0.02C cooling over a period of 2 years is WELL within the natural variability of the climate system.
I have a quick question for you:
Based on your Schwabe solar cycle hypothisis, what is the lag time between solar cycle and climate response?
Also what is the mechanism you propose that links variations in solar cycle length with the climate? Correlation does not prove causation, so you really need to elaborate on your mechanism.
Unfortunately you seem to have fallen for several common pitfalls. Firstly you will have to revise your analysis as HadCRUT3 was recently adjusted to correct for an error in data processing and the "nose dive" you speak of has all but vanished: http://hadobs.metoffice.com/hadcrut3/diagnostics/global/nh+sh/
Also if you look at any other metric, such as GISTEMP form NASA, the cooling you claim is essentially non-existant.
Secondly you need to work on your statistics - fitting a 4th order polynomial would be fine if there was some evidence that the climate was a 4th order polynomial system - which there isn't. I am guessing the intent of the 4th order fit is to exaggerate your alleged "cooling trend".
You also completely overlooked any sort of uncertainty estimates. If you look at the actual data from the Hadley center you will notice two things. The first is that the "cooling trend" (ie the last 2 years being cooler than the two before those) is about 0.02C. However the 2 sigma error bars in the data set are about +/- 0.1C. A "trend" that is 5 times smaller than the uncertainty is not a trend, it is statistically meaningless. You also forgot to put error bars in your model comparison - if you did you would notice that the error bars include almost ALL the model projections. Finally a 0.02C cooling over a period of 2 years is WELL within the natural variability of the climate system.
I have a quick question for you:
Based on your Schwabe solar cycle hypothisis, what is the lag time between solar cycle and climate response?
Also what is the mechanism you propose that links variations in solar cycle length with the climate? Correlation does not prove causation, so you really need to elaborate on your mechanism.
Well, lets look at some other data.
In 1988 James Hansen published one of the most famous climate models. He generated three scenarios.
Scenario A envisioned little or no efforts to curb GHG emissions and very little volcanic activity.
Scenario C envisioned a very significant effort to curb GHGs and significant volcanic activity.
Scenario B was somewhere in between. Below is a copy of Hansens 1988 model with the HADCRUT3 temperature data (10 year moving average and 4th order polynomial) overlaid. As is shown by the data, the actual temperature changes were less than all of Hansens scenarios despite the fact that GHG emissions have continued to grow.
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Some will undoubtedly say that computer modeling methods and climate modelers understanding of climate dynamics have improved since Hansens 1988 model. Therefore, a more recent model:
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The actual temperature observations since 2000 must certainly fall well within the range of these models. Lets see if they did:
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These models are quite recent, but the actual temperatures just wont cooperate. The HADCRUT3 annual temperature anomaly tracked at the low end of the model range until a couple of years ago and then took a nose dive. None of the models predicted this.
If CO2 is still going up, and it is, then why on Earth did those temperatures start to decline? Could the Sun have anything to do with this? As I have argued before, it Sun plays more of a role in global temperatures than CO2.
Note how shortening Schwabe (11-year) Solar Cycles preceded the warming periods from 1908-1942 and 1978-2003. Furthermore, lengthening Schwabe Solar Cycles preceded the cooling period from 1942-1978. With the end of Solar Cycle 23 in January 2008, it is now clear that the Schwabe has gone long again.
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NOTE: SOLAR CYCLE LENGTH IS PLOTTED WITH INCREASES MOVING TOWARD THE X-AXIS AND DECREASES AWAY FROM THE X-AXIS
Since the end of the Little Ice Age, the Earth has oscillated between warming and cooling spells of 0.2C to 0.5C every 30 (+/- 5) years:
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If Gore is only the messenger, how did he miss all of this from those delivering the message? Oh yeah, it isn't the message he wants the poor peons who have no say in how much of their money which they worked for is taken from them in the name of Science and wasted on trying to alter nature.
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