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Information Center for Mathematical Science

세미나

Information Center for Mathematical Science

세미나

서울대학교 지구환경과학부 세미나
Title Origin and deposition of the dissolved sulfate from Deception Island, Antarctic Peninsula
Date 2018-12-07
Speaker 김영민(SNU)
Sponsors 2018-12-07
Host SNU
Place 24동 103호
Abstract Oxygen (16O, 17O and 18O) and sulfur (32S, 33S, 34S and 36S) isotope ratios of and major ion (Na+, Ca2+, Cl-, NO3- and SO42-) concentrations in lakes, ponds and creeks from Deception Island, Antarctic Peninsula were analyzed to study the sources of sulfate, its oxidation, and the surficial processes of the dissolved sulfate. The positive relationship between the δ34Ssulfate (8.1 ‰ to 17.3 ‰) and the Cl-/SO42- molar ratio suggests mixing of sulfate from atmospheric deposition and from oxidation of sulfide minerals. The average sea salt fraction (28 %) and δ34Snss values (from 5.6 ‰ to 15.9 ‰) indicate that a combination of sea salt and marine biogenic sulfide provide the high δ34S end-member of the dissolved sulfates. The relatively low δ18Osulfate (from -4.6 ‰ to 0.7 ‰) of Deception Island water suggests a role of local water in the formation of sulfate. Slightly negative but mass-dependent Δ17Osulfate values imply that atmospheric oxidation by O3 and H2O2 are negligible, while these values might suggest a significant role of oxidation by molecular oxygen and •OH. The distinctly low δ34Ssulfate value of two samples suggests the input of sulfate from sulfide oxidation. Slight elevation of δ34Ssulfate values up to 17.3 ‰ compared to a typical atmospheric value indicates a minimal role for dissimilatory microbial sulfate reduction of Deception Island water and sediments. Both Δ33Ssulfate and Δ36Ssulfate values are homogeneous and near zero, implying that the dominant atmospheric oxidation process is tropospheric and that there are minimal to no contributions of stratospheric sulfate to Deception Island water.