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Divergence Between GISS and UAH since 1980 January 17, 2009

Posted by honestclimate in Temperature.
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Divergence Between GISS and UAH since 1980

From Watts Up with That, January 17, 2009

Guest post by Steven Goddard

The GISS website shows the graph below, which indicates a steady, steep warming trend over the last 30 years.  The monthly average anomaly for 2008 (0.44) is 0.26 degrees warmer than the monthly average anomaly for 1980 (0.18.)  Data obtained from here: http://www.woodfortrees.org/data/gistemp/from:1980/plot/uah/from:1980

By contrast, the UAH monthly average anomaly for 2008 (0.05) is 0.04 degrees cooler than the UAH monthly average anomaly for 1980 (0.09.)  Again, data obtained from here: http://www.woodfortrees.org/data/uah/from:1980

This 1980-2008 discrepancy between GISS and UAH is important, as it is nearly equal to the claimed warming trend since 1980.

Taking this one step further, I made a graph of the difference between the GISS and UAH monthly anomalies since 1980.
As you can see below, the discrepancy has increased over time.  Using Google’s linest() function, the divergence between GISS and UAH is increasing at a rate of 0.32C/century.  (GISS uses a different baseline than UAH, but the slope of the difference should be zero, if the data sets correlated properly.)  The slope is not zero, which indicates an inconsistency between the data sets.

Read the rest, click here

Comments»

1. Michelle - January 17, 2009

Maybe the climate change gurus have deliberately created different measuring strategies so that they can pick and chose from data sources? IPCC’s graphs certainly have changed from one report to another.

2. Tuukka Simonen - January 18, 2009

If you draw a linear trend you’ll see that UAH also shows warming.

RSS which uses the same satellite data as UAH is consistent with GISTEMP and HADCRUT. The only dataset that is inconsistent with the others is UAH which is made by “skeptics” (1 out of 2 of them also supports intelligent design and doesn’t keep it unscientific which casts heavy doubts that the guy is not thinking clearly).

But hey, what if you stop talking about WEATHER and start talking about CLIMATE (which is all about averages of longer periods of times) and check if this decade has been warmer than the previous one? Use UAH if you want, since all datasets show significant warming.

3. honestclimate - January 18, 2009

Dear Tuukka Simonen

“But hey, what if you stop talking about WEATHER and start talking about CLIMATE”
-No I understand perfectly the difference between WEATHER and CLIMATE. It’s all explained here:

https://anhonestclimatedebate.wordpress.com/2008/12/05/understanding-man-made-climate-change/


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