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CO2 Drives Stratospheric Cooling
Coverage from Earth.com, Yale E360, and others
A Columbia University study develops a quantitative explanation for the long-observed cooling of the stratosphere as atmospheric carbon dioxide rises.
The mechanism centers on changes in infrared radiation: in the thin upper atmosphere, additional CO2 increases heat loss to space, while the resulting cooler stratosphere reduces total outgoing energy and reinforces warming below. The work could improve climate modeling and inform research on related effects involving ozone, satellites, and other planetary atmospheres.
The story is modestly expanded to emphasize downstream implications of the stratospheric-cooling mechanism, especially possible effects on ozone recovery, satellites, and other planetary atmospheres. It also adds a separate, loosely related challenge to CO2-linked ocean radiative-flux interpretations, though that does not directly alter the stratospheric-cooling finding.