Abstract
Abstract The recent rapid increase in ethanol use as a biofuel and emission to the atmosphere may impact air quality and oxidizing capacity in the atmosphere. However, the global models show large uncertainties on sources of atmospheric ethanol. Concentrations and compound-specific stable carbon isotope ratios of ethanol (δ13Cethanol) in rainwater were measured in samples collected in six countries and 16 different locations over a two-year period (n = 270 for concentration; n = 111 for δ13Cethanol). Ethanol concentrations ranged from below the limit of detection ( 0.15), indicating that biofuel ethanol in rainwater is locally supplied during rain droplet formation. The results of this study are significant because they shed new insight into the role of anthropogenic emission of ethanol to the atmosphere. This study is particularly relevant as ethanol production and usage as a biofuel continues to increase globally.
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