TY  - JOUR
AU  - Savarino, J.
AU  - Bekki, S.
AU  - Cole-Dai, J.
AU  - Thiemens, M. H.
PY  - 2003//
TI  - Evidence from sulfate mass independent oxygen isotopic compositions of dramatic changes in atmospheric oxidation following massive volcanic eruptions
T2  - J. Geophys. Res.
JO  - Journal of geophysical research-atmospheres
VL  - 108
PB  - American Geophysical Union
KW  - 0340 Atmospheric Composition and Structure: Middle atmosphere—composition and chemistry
KW  - 0365 Atmospheric Composition and Structure: Troposphere—composition and chemistry
KW  - 0370 Atmospheric Composition and Structure: Volcanic effects
KW  - 1040 Geochemistry: Isotopic composition/chemistry
KW  - 1863 Hydrology: Snow and ice
N2  - Oxygen isotopic ratio measurements (?17O and ?18O) of background and volcanic sulfate preserved in South Pole snow and ice were used to investigate the impact on the oxidation state of the atmosphere by explosive volcanic eruptions. By comparing different paleovolcanic events, we observe a difference in the SO2 oxidation pathway between moderate (tens of teragrams (Tg) of SO2) and massive (hundreds of Tg) eruptions. Both isotopic data and numerical simulations suggest the shutdown of stratospheric OH chemistry and the opening of unaccounted oxidation channels for SO2, such as the reaction with O(3P) atoms when hundreds of Tg of SO2 are injected into the stratosphere. It is very likely that oxidation rates and pathways and concentrations of most traces gases are also dramatically affected, with potentially important implications for climate forcing.
SN  - 0148-0227
UR  - http://dx.doi.org/10.1029/2003JD003737
N1  - exported from refbase (http://publi.ipev.fr/polar_references/show.php?record=5589), last updated on Mon, 27 Apr 2009 13:37:44 +0200
ID  - Savarino_etal2003
ER  -