Physics
Scientific paper
Jul 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002georl..29n..30a&link_type=abstract
Geophysical Research Letters, Volume 29, Issue 14, pp. 30-1, CiteID 1685, DOI 10.1029/2002GL014879
Physics
14
Atmospheric Composition And Structure: Aerosols And Particles (0345, 4801), Atmospheric Composition And Structure: Troposphere-Composition And Chemistry, Geochemistry: Isotopic Composition/Chemistry, Global Change: Atmosphere (0315, 0325), Meteorology And Atmospheric Dynamics: Paleoclimatology
Scientific paper
Ice cores have provided a wealth of information about past atmospheric composition and climate variability. However, relatively little is known about how the chemistry of the atmosphere has responded to natural climate change and anthropogenic influences. The oxygen isotopes (δ17O and δ18O) of sulfate serve as a recorder of the relative amounts of gas and aqueous-phase oxidation pathways in the atmosphere. This quality, along with its stability, renders sulfate an ideal proxy to investigate changes in oxidation pathways of S(IV) species in present and ancient atmospheres. The oxygen isotopic composition of sulfate in eight samples from the Vostok, Antarctica ice core, covering one full climate cycle, is presented. Assuming tropospheric-derived sulfate only, isotope data reveal that the ratio of gas-phase over aqueous-phase oxidation of S(IV) species was greater during the last glacial than the surrounding interglacial periods.
Alexander Becky
Barkov Nartsiss I.
Delmas R. J.
Savarino Joël
Thiemens Mark H.
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