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. Atmospheric fluxes of dissolved organic matter (DOM) were studiedfor the first time on the island of Lampedusa, a remote site in the centralMediterranean Sea (Med Sea), between 19 March 2015 and 1 April 2017. The main goals of this study were to quantify total atmosphericdeposition of DOM in this area and to evaluate the impact of Saharan dustdeposition on DOM dynamics in the surface waters of the Mediterranean Sea.Our data show high variability in DOM deposition rates without a clearseasonality and a dissolved organic carbon (DOC) input from the atmosphereof 120.7 mmol DOC m−2 yr−1. Over the entire time series, theaverage dissolved organic phosphorus (DOP) and dissolved organic nitrogen(DON) contributions to the total dissolved pools were 40 % and 26 %,respectively. The data on atmospheric elemental ratios also show that eachdeposition event is characterized by a specific elemental ratio, suggestinga high variability in DOM composition and the presence of multiple sources.This study indicates that the organic substances transported by Saharandust on Lampedusa mainly come from a natural sea spray and that Saharandust can be an important carrier of organic substances even though the loadof DOC associated with dust is highly variable. Our estimates suggest thatatmospheric input has a larger impact on the Med Sea than on the globalocean. Further, DOC fluxes from the atmosphere to the Med Sea can be up to6 times larger than total river input. Longer time series combined withmodeling would greatly improve our understanding of the response of DOMdynamics in the Med Sea to the change in aerosol deposition pattern due tothe effect of climate change.

Atmospheric deposition of organic matter at a remote site in the central Mediterranean Sea: implications for the marine ecosystem