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UV induced mass independent sulfur isotope fractionation in stratospheric volcanic sulfate J. Savarino, A. Romero, J. Cole-Dai, S. Bekki, and M.H. Thiemens.

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Presentation on theme: "UV induced mass independent sulfur isotope fractionation in stratospheric volcanic sulfate J. Savarino, A. Romero, J. Cole-Dai, S. Bekki, and M.H. Thiemens."— Presentation transcript:

1 UV induced mass independent sulfur isotope fractionation in stratospheric volcanic sulfate J. Savarino, A. Romero, J. Cole-Dai, S. Bekki, and M.H. Thiemens Universität Heidelberg Institut für Umweltphysik

2 Content Some explanations/definitions Sulphur-Cycle Summary of the paper Questions Discussion Universität Heidelberg Institut für Umweltphysik

3 What means and = ( R sample /R standard – 1) x 1000 R = [ 33 S]/[ 32 S] 33 S = 33 S – 1000 x [(1 + 34 S/1000) 0.515 – 1 ] 0 36 S = 36 S – 1000 x [(1 + 34 S/1000) 1.90 –1 ] 0 Universität Heidelberg Institut für Umweltphysik

4 Mass-dependent and mass- independent fraction Mass dependent: only the different mass is the cause of different fraction of the isotopes Mass independent: fractionation caused by something else as mass (example Photolyse in the case of SO 2 ) Universität Heidelberg Institut für Umweltphysik

5 Depth of penetration of solar radiation through the atmosphere Universität Heidelberg Institut für Umweltphysik

6 Sulphur-Cycle Universität Heidelberg Institut für Umweltphysik

7 The sense behind it ? 1. determination of the degree of UV light affected S oxidation in the atmosphere Universität Heidelberg Institut für Umweltphysik 2. Determination of the stratospheric and tropospheric nature of volcanic eruptions -> reassess the climatic impact of past volcanic eruptions (?) sulfur isotopic analysis of ice core volcanic sulfate can be independent method to identify climatically significant eruptions in the investigation of the climate volcanic connection

8 Observation Analysis of antarctic snow blocks, ice cores and aerosol filter For volcanic sulfate, the S - isotopes demonstrate a significant range of variations values 34 S, 33 S, 36 S of aerosol and background sulfate are all within small isotopic ranges mass-independent sulfur isotopes anomalies in the stratosphere appear to depend on the exposure of SO 2 to UV radiation (experiments in the laboratory) Universität Heidelberg Institut für Umweltphysik

9 Plot of 33 S and 36 S sulfur isotope anomalies of different sulfate sources Universität Heidelberg Institut für Umweltphysik ?

10 Plot of 33 S versus 34 S and Plot of 36 S and 33 S Universität Heidelberg Institut für Umweltphysik

11 My Questions to the authors Did you inspect carefully into the graphics? C.f., why Cerro Hudson eruption is not included in the 36 S plot? Why they show only this two examples of volcanic eruption, at least Tambora should have been a better examble than Cerro Hudson?.....?

12 Thanks for your attention and tell me - what do you think...!!!

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14 Plot of 33 S values versus sample age Universität Heidelberg Institut für Umweltphysik Farquar, 2000


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