Until recently, scientists called the remote zones of the upper atmosphere the “ignorosphere,” because they knew so little about them. So now that they know more, what are we learning, and should it reassure or alarm us?
The story of changing temperatures in the atmosphere at all levels is largely the story of CO. We know all too well that our emissions of more than 40 billion tons of the gas annually are warming the troposphere. This happens because the gas absorbs and re-emits solar radiation, heating other molecules in the dense air and raising temperatures overall.
Satellite data have recently revealed that between 2002 and 2019, the mesosphere and lower thermosphere cooled by 3.1 degrees F . Mlynczaklevels thought likely by later this century will cause a cooling in these zones of around 13.5 degrees F , which is between two and three times faster than the average warming expected at ground level.
Much of the research analyzing changes aloft has been done by scientists employed by NASA. The space agency has the satellites to measure what is happening, but it also has a particular interest in the implications for the safety of the satellites themselves.
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