A researcher whose team compared satellite infrared spectra separated by twenty-seven years. The study links changes in outgoing longwave radiation to the wavelength-dependent absorption by each greenhouse gas, making the atmosphere’s changing radiative behavior an observable spectral signal.[ref]
Increases in greenhouse forcing inferred from the outgoing longwave radiation spectra of the Earth in 1970 and 1997 by John E. Harries and others. Author list and abstract: 1970–1997 spectral comparison and greenhouse-gas interpretation
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