Climate driven changes in the oxidation pathways of atmospheric sulfur

被引：58

作者：

Alexander, B

Savarino, J

Barkov, NI

Delmas, RJ

Thiemens, MH

机构：

[1] Univ Calif San Diego, Dept Chem & Biochem, La Jolla, CA 92093 USA

[2] Arctic & Antarctic Res Inst, St Petersburg 199226, Russia

[3] CNRS UJF Lab Glaciol & Geophys Environm, F-38402 St Martin Dheres, France

来源：

GEOPHYSICAL RESEARCH LETTERS | 2002年 / 29卷 / 14期

关键词：

D O I：

10.1029/2002GL014879

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

[1] 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 (delta(17)O and delta(18)O) 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.

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页码：30 / 1

页数：4

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