%0 Journal Article %T A Global Assessment of Dissolved Organic Carbon in Precipitation %+ MIT Department of Civil and Environmental Engineering (CEE) %A Safieddine, Sarah %A Heald, Colette %< avec comité de lecture %@ 0094-8276 %J Geophysical Research Letters %I American Geophysical Union %V 44 %N 22 %P 11,672-11,681 %8 2017-11-27 %D 2017 %R 10.1002/2017GL075270 %Z Environmental SciencesJournal articles %X Precipitation is the largest physical removal pathway of atmospheric reactive organic carbon in the form of dissolved organic carbon (DOC). We present the first global DOC distribution simulated with a global model. A total of 85 and 188 Tg C yr À1 are deposited to the ocean and the land, respectively, with DOC ranging between 0.1 and 10 mg C L À1 in this GEOS-Chem simulation. We compare the 2010 simulated DOC to a 30 year synthesis of measurements. Despite limited measurements and imperfect temporal matching, the model is able to reproduce much of the spatial variability of DOC (r = 0.63), with a low bias of 35%. We present the global average carbon oxidation state (OS c) as a simple metric for describing the chemical composition. In the atmosphere, À1:8≤OS c ≤ À 0:6, and the increase in solubility upon oxidation leads to a global increase in OS c in precipitation with À0:6≤OS c DOC ≤0. %G English %2 https://insu.hal.science/insu-03003712/document %2 https://insu.hal.science/insu-03003712/file/2017GL075270.pdf %L insu-03003712 %U https://insu.hal.science/insu-03003712 %~ SDE %~ INSU %~ GIP-BE