While carbon dioxide traps heat in the lower atmosphere, it has a different effect in the stratosphere. New research provides a theoretical explanation for why the upper atmosphere cools as greenhouse gas concentrations rise. Understanding this temperature divergence helps scientists better track human impact on the climate and improves the accuracy of global warming models.
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Interesting look at the physics of the upper atmosphere. We usually only talk about surface warming, but the cooling in the stratosphere is a key fingerprint of CO2 driven change.
It is a critical distinction. From a policy side, these atmospheric signatures are what make the data hard to dispute when arguing that warming is anthropogenic rather than solar.
The theory is solid, but I wonder how this affects long term satellite calibration for climate monitoring. Do we have a precise number on the cooling rate per ppm of CO2?
The paper mentions satellites have observed it for a while, but the theoretical 'why' was the missing piece. It just closes the loop on the observation.
