Add time:08/28/2019         Source:sciencedirect.com

Croconic acid, a polymer of carbon monoxide, exhibits very strong absorption in the blue and near ultraviolet. We propose that this material, as a minor contaminant of the sulfuric acid cloud droplets, may represent the absorber responsible for the ultraviolet cloud features and the pale yellow color of the Venus clouds. The results of measurements of the absorption coefficients for a dilute solution of croconic acid in sulfuric acid are presented and used in models of the scattering by the clouds to show that the observed behavior of the planetary albedo in the blue and near ultraviolet can be qualitatively reproduced. We also propose a possible mechanism for the production of croconic acid in the cloudtop region on Venus.

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