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. In this study, we compare measured and simulated O4absorptions for conditions of extremely low aerosol optical depth (between0.034 to 0.056 at 360 nm) on one day during a ship cruise in the tropicalAtlantic. For such conditions, the uncertainties related to imperfectknowledge of aerosol properties do not significantly affect the comparisonresults. We find that the simulations underestimate the measurements by15 % to 20 %. Even for simulations without any aerosols, the measuredO4 absorptions are still systematically higher than the simulationresults. The observed discrepancies cannot be explained by uncertainties ofthe measurements and simulations and thus indicate a fundamentalinconsistency between simulations and measurements.

atmospheric measurement techniques

Quantitative comparison of measured and simulated O&amp;lt;sub&amp;gt;4&amp;lt;/sub&amp;gt; absorptions for one day with extremely low aerosol load over the tropical Atlantic