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Shaheen R, Abaunza M M, Jackson T L, McCabe J, Savarino J, Thiemens M H, |
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Title |
Large sulfur-isotope anomaly in nonvolcanic sulfate aerosol and its implications for the Archean atmosphere
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Journal Article |
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2014 |
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Proceedings of the National Academy of Sciences |
Abbreviated Journal |
0027-8424 |
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111 |
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33 |
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11979-11983 |
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Sulfur-isotopic anomalies have been used to trace the evolution of oxygen in the Precambrian atmosphere and to document past volcanic eruptions. High-precision sulfur quadruple isotope measurements of sulfate aerosols extracted from a snow pit at the South Pole (1984-2001) showed the highest S-isotopic anomalies ({Delta}33S = +1.66{per thousand} and {Delta}36S = +2{per thousand}) in a nonvolcanic (1998-1999) period, similar in magnitude to Pinatubo and Agung, the largest volcanic eruptions of the 20th century. The highest isotopic anomaly may be produced from a combination of different stratospheric sources (sulfur dioxide and carbonyl sulfide) via SOx photochemistry, including photoexcitation and photodissociation. The source of anomaly is linked to super El Nino Southern Oscillation (ENSO) (1997-1998)-induced changes in troposphere-stratosphere chemistry and dynamics. The data possess recurring negative S-isotope anomalies ({Delta}36S = -0.6 {+/-} 0.2{per thousand}) in nonvolcanic and non-ENSO years, thus requiring a second source that may be tropospheric. The generation of nonvolcanic S-isotopic anomalies in an oxidizing atmosphere has implications for interpreting Archean sulfur deposits used to determine the redox state of the paleoatmosphere.
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5972 |
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Legrand M, Preunkert S, Frey M, Bartels-Rausch Th, Kukui A, King M D, Savarino J, Kerbrat M, Jourdain B, |
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Large mixing ratios of atmospheric nitrous acid (HONO) at Concordia (East Antarctic Plateau) in summer: a strong source from surface snow?
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2014 |
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Atmospheric Chemistry and Physics |
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1680-7316 |
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14 |
Issue |
18 |
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9963-9976 |
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1011 |
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Copernicus GmbH |
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5968 |
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Spatial ecotoxicology: How do nonbreeding distribution of migratory Arctic seabirds affect their Hg seasonal contamination? |
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Conference - International - Communication |
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2014 |
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Invited talk
Arctic Change 2014 International Conference, Ottawa, Dec. 2014 |
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388 |
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5966 |
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Bost, C.A., Scheffer, A., Perron, C., Barbraud, C., Jenouvrier, S., Terray, P., Cotte, C. |
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Conference - International - Communication |
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2014 |
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394 |
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5965 |
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Scheffer, A. Bost, C.A., Lascelles B., Trathan, P., Ratcliffe, N. |
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Foraging areas of macaroni penguins in the south atlantic and south Indian ocean. 5th International Bio-Logging Science Symposium, 22-27 Septembre 2014, Strasbourg. |
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Conference - National - Communication |
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2014 |
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yes |
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5964 |
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M. Sacchettini and E. Le Meur
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2014 |
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1053 |
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5962 |
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COLLIGNON B. |
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2014 |
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5961 |
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COLLIGNON B. |
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2014 |
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5960 |
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COLLIGNON B. |
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5959 |
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COLLIGNON B. |
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