Search Results - "Thiemens, M. H."

Nitrogen and oxygen isotopic constraints on the origin of atmospheric nitrate in coastal Antarctica by Savarino, J., Kaiser, J., Morin, S., Sigman, D. M., Thiemens, M. H.

“…Throughout the year 2001, aerosol samples were collected continuously for 10 to 15 days at the French Antarctic Station Dumont d'Urville (DDU) (66°40' S,…”
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Sulfate formation in sea-salt aerosols: Constraints from oxygen isotopes by Alexander, B., Park, R. J., Jacob, D. J., Li, Q. B., Yantosca, R. M., Savarino, J., Lee, C. C. W., Thiemens, M. H.

“…We use observations of the mass‐independent oxygen isotopic composition (Δ17O) of sulfate in the marine boundary layer (MBL) to quantify the sulfate source…”
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Mass-Independent Sulfur of Inclusions in Diamond and Sulfur Recycling on Early Earth by Farquhar, J., Wing, B. A., McKeegan, K. D., Harris, J. W., Cartigny, P., Thiemens, M. H.

“…Populations of sulfide inclusions in diamonds from the Orapa kimberlite pipe in the Kaapvaal-Zimbabwe craton, Botswana, preserve mass-independent sulfur…”
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UV induced mass-independent sulfur isotope fractionation in stratospheric volcanic sulfate by Savarino, J., Romero, A., Cole-Dai, J., Bekki, S., Thiemens, M. H.

“…Sulfuric acid aerosols produced in the stratosphere following massive volcanic eruptions possess a mass‐independent sulfur isotopic signature, acquired when…”
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WAIS Divide ice core suggests sustained changes in the atmospheric formation pathways of sulfate and nitrate since the 19th century in the extratropical Southern Hemisphere by Sofen, E. D, Alexander, B, Steig, E. J, Thiemens, M. H, Kunasek, S. A, Amos, H. M, Schauer, A. J, Hastings, M. G, Bautista, J, Jackson, T. L, Vogel, L. E, McConnell, J. R, Pasteris, D. R, Saltzman, E. S

“…The 17O excess (Δ17O = δ17O−0.52 × δ18O) of sulfate and nitrate reflects the relative importance of their different production pathways in the atmosphere. A…”
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Sulfate sources and oxidation chemistry over the past 230 years from sulfur and oxygen isotopes of sulfate in a West Antarctic ice core by Kunasek, S. A., Alexander, B., Steig, E. J., Sofen, E. D., Jackson, T. L., Thiemens, M. H., McConnell, J. R., Gleason, D. J., Amos, H. M.

“…The sulfur and oxygen isotopic composition of sulfate in polar ice cores provides information about atmospheric sulfate sources and formation pathways, which…”
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Isotopic analysis of aerosol sulfate and nitrate during ITCT-2k2: Determination of different formation pathways as a function of particle size by Patris, N., Cliff, S. S., Quinn, P. K., Kasem, M., Thiemens, M. H.

“…The triple isotopic composition of oxygen in sulfate and nitrate, and the sulfur isotopic composition of the sulfate fine fraction, have been measured on…”
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Impact of preindustrial biomass-burning emissions on the oxidation pathways of tropospheric sulfur and nitrogen by Alexander, B., Savarino, J., Kreutz, K. J., Thiemens, M. H.

“…Ice core measurements (H2O2 and CH4/HCHO) and modeling studies indicate a change in the oxidation capacity of the atmosphere since the onset of the Industrial…”
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Oxygen and sulfur isotopic composition of volcanic sulfate aerosol at the point of emission by Mather, T. A., McCabe, J. R., Rai, V. K., Thiemens, M. H., Pyle, D. M., Heaton, T. H. E., Sloane, H. J., Fern, G. R.

“…Volcanic sulfate aerosol is emitted from the vents of many active volcanoes, but its origin has not yet been explained. We report the first measurements of the…”
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East Antarctic ice core sulfur isotope measurements over a complete glacial-interglacial cycle by Alexander, B., Thiemens, M. H., Farquhar, J., Kaufman, A. J., Savarino, J., Delmas, R. J.

“…Both sulfur and oxygen isotopes of sulfate preserved in ice cores from Greenland and Antarctica have provided information on the relative sources of sulfate in…”
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Climate driven changes in the oxidation pathways of atmospheric sulfur by Alexander, B., Savarino, J., Barkov, N. I., Delmas, R. J., Thiemens, M. H.

“…Ice cores have provided a wealth of information about past atmospheric composition and climate variability. However, relatively little is known about how the…”
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Oxygen isotopic fractionation in the photochemistry of nitrate in water and ice by McCabe, J. R., Boxe, C. S., Colussi, A. J., Hoffmann, M. R., Thiemens, M. H.

“…We recently reported the first multiple oxygen isotope composition of nitrate (NO3−) in ice cores (Alexander et al., 2004). Postdepositional photolysis and…”
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Carbonates in CM2 chondrites: constraints on alteration conditions from oxygen isotopic compositions and petrographic observations by Benedix, G.K, Leshin, L.A, Farquhar, J, Jackson, T, Thiemens, M.H

“…High-precision measurements of the oxygen isotopic compositions of carbonates (calcite and dolomite) from five CM2 chondrites are presented and put into…”
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Atmospheric science. The mass-independent ozone isotope effect by Thiemens, M H

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Planetesimal sulfate and aqueous alteration in CM and CI carbonaceous chondrites by Airieau, S.A., Farquhar, J., Thiemens, M.H., Leshin, L.A., Bao, H., Young, E.

“…Water-soluble sulfate salts extracted from six CM chondrites have oxygen isotope compositions that are consistent with an extraterrestrial origin. The Δ 17O of…”
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Mass-Independent Isotope Effects in Planetary Atmospheres and the Early Solar System by Thiemens, Mark H.

“…A class of isotope effects that alters isotope ratios on a mass-independent basis provides a tool for studying a wide range of processes in atmospheres of…”
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Sulfur and Oxygen Isotope Analysis of Sulfate at Micromole Levels Using a Pyrolysis Technique in a Continuous Flow System by Savarino, Joel, Alexander, Becky, Darmohusodo, Vincent, Thiemens, Mark H

“…The discovery of a mass-independent isotopic composition (Δ17O = (δ17O − 0.512 * δ18O) ≠ 0) in aerosol sulfate and the identification of its origin…”
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Contributions of an ancient evaporitic-type reservoir to subglacial Lake Vostok chemistry by De Angelis, M, Petit, J.-R, Savarino, J, Souchez, R, Thiemens, M.H

“…We present here the first comprehensive study of the chemical composition of accretion ice from Lake Vostok. Ion chromatographic analyses were performed on…”
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Mass-Independent Isotopic Compositions in Terrestrial and Extraterrestrial Solids and Their Applications by Thiemens, Mark H, Savarino, Joel, Farquhar, James, Bao, Huiming

“…In 1983, Thiemens and Heidenreich reported the first chemically produced mass-independent isotope effect. This work has been shown to have a wide range of…”
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Stratospheric CO2 isotopic anomalies and SF6 and CFC Tracer Concentrations in the Arctic Polar Vortex by Alexander, B., Vollmer, M. K., Jackson, T., Weiss, R. F., Thiemens, M. H.

“…Isotopic measurements (δ17O and δ18O) of CO2 along with concentration measurements of SF6, CCl3F (CFC‐11), CCl2F2 (CFC‐12) and CCl2FCClF2 (CFC‐113) in…”
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