Yesterday I pointed out that Muller’s graph did not match HadCRUT global temperatures. This was due to the fact that Muller was using only land based thermometer readings and did not include ocean temperatures – which comprise 70% of the Earth’s surface – have risen more slowly.
So let’s assume that Muller has proven that land temperatures are consistent between HadCRU, GISS and Berkeley. They all show a rise of about 0.3C per decade since the start of the satellite record in 1978. Satellite data from UAH shows a much smaller rise over land of 0.18C per decade during that same time period.
Satellite data is measured at 14,000 feet, and would exaggerate the warming if it was due to “global warming.” However, we see the exact opposite. The only plausible explanation is that the surface record is biased by UHI effects, because thermometers are located where humans live, build roads, remove snow, heat their homes, build buildings, etc.
I have a thermometer on my bicycle, and frequently see a 2-5C temperature difference between a large road and an open-space bicycle trail two blocks away. I have also seen a 5-10C difference between Tempe, Az. and the open desert 20 miles to the south.
I’m sending this to Dr. Muller for comment.