Quantification and molecular characterization of dissolved organic sulfur in water samples obtained during POLARSTERN cruise ANT-XXV (PS73) to the East Atlantic and the Southern Ocean ...

• Main Authors: Ksionzek, Kerstin B, Lechtenfeld, Oliver J, McCallister, S Leigh, Schmitt-Kopplin, Philippe, Geuer, Jana K, Geibert, Walter, Koch, Boris P
• Format: Article in Journal/Newspaper
• Language: English
• Published: PANGAEA 2016
• Subjects: Center for Marine Environmental Sciences MARUM; Ecological Chemistry @ AWI AWI_EcolChem; Marine Geochemistry @ AWI AWI_MarGeoChem; Southern Ocean
• Online Access: https://dx.doi.org/10.1594/pangaea.858568; https://doi.pangaea.de/10.1594/PANGAEA.858568

Although sulfur is an essential element for marine primary production and critical for climate processes, little is known about the oceanic pool of non-volatile dissolved organic sulfur (DOS). We present a basin-scale distribution of solid phase extractable DOS in the East Atlantic Ocean and the Atlantic sector of the Southern Ocean. While molar DOS versus dissolved organic nitrogen (DON) ratios of 0.11 ± 0.024 in Atlantic surface water resembled phytoplankton stoichiometry (S/N ~ 0.08), increasing dissolved organic carbon (DOC) versus DOS ratios and decreasing methionine-S yield demonstrated selective DOS removal and active involvement in marine biogeochemical cycles. Based on stoichiometric estimates, the minimum global inventory of marine DOS is 6.7 Pg S, exceeding all other marine organic sulfur reservoirs by an order of magnitude. ... : Supplement to: Ksionzek, Kerstin B; Lechtenfeld, Oliver J; McCallister, S Leigh; Schmitt-Kopplin, Philippe; Geuer, Jana K; Geibert, Walter; Koch, Boris P (2016): Dissolved organic sulfur in the ocean: Biogeochemistry of a petagram inventory. Science, 354(6311), 456-459 ...