3:30 PM - 3:45 PM
[BPT05-07] High-resolution 32/33/34/36SO2 absorption cross-section measurements for revealing Archean atmospheric composition
Keywords:Archean atmosphere, Sulfur isotope, Photochemistry
Our group's new 1-D model which focuses on UV spectra because reactions and fractionation factor (such as self-shielding) change delicately as a function of irradiative photon flux. Fractionation factor of photodissociation can be calculated by isotopologue cross-section and irradiative photon flux. Then in order to develop 1-D atmospheric model including sulfur isotopes, SO2 isotopologue cross-sections (32/33/34/36SO2) are necessary. Although SO2 isotopologue cross-section have been measured, they are too low-resolution to estimate self-shielding (Danielache et al. 2008, Endo et al. 2015). Here, we report preliminary results of high resolution (~1cm-1) 32/33/34/36SO2 absorption cross-sections and estimation of fractionation factor including self-shielding effect.
Referces: Endo et al. (2016), EPSL, Danielache et al. (2008), JGR Atmospheres, Endo et al. (2015), JGR Atmospheres