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A Global Assessment of Dissolved Organic Carbon in Precipitation

Abstract : 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.
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Sarah Safieddine, Colette Heald. A Global Assessment of Dissolved Organic Carbon in Precipitation. Geophysical Research Letters, American Geophysical Union, 2017, 44 (22), pp.11,672-11,681. ⟨10.1002/2017GL075270⟩. ⟨insu-03003712⟩



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