The problem with satellite measurements is that they don’t actually measure the temperature. Instead, they measure radiances (amount of energy reflected by the surface) which must then be converted in some way to calculate the temperature. Depending on the methods and equations applied, different results can be obtained – hence there is a wide range of values between research results, including those those that are cooler than they should be. In addition, satellites use a lot of different instruments with different accuracy that degrades over time. To add to that, the satellite record is very short, so depending on which period of time you look at, emerging trends can look quite different.
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