Vertical profile of the carbon isotopic ratio of stratospheric methane over Japan

Details Vertical profile of the carbon isotopic ratio of stratospheric methane over Japan Vertical profile of the carbon isotopic ratio of stratospheric methane over Japan

Dec 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997georl..24.2989s&link_type=abstract

Geophysical Research Letters, Volume 24, Issue 23, p. 2989-2992

Physics

17

Atmospheric Composition And Structure: Middle Atmosphere-Composition And Chemistry

Scientific paper

Stratospheric air samples were collected over Japan on August 31, 1994 using a balloon-borne cryogenic sampler and then analyzed for the CH4 concentration and δ13C in CH4. The δ13C value increased from about -47.5‰ at the tropopause to about -38.9‰ at 34.7 km, accompanied by a rapid decrease of the CH4 concentration with height. From the measured values of the CH4 concentration and δ13C, the apparent carbon isotopic fractionation factor was estimated to be 1.0131+/-0.0006. The contributions of the chemical CH4 reactions with OH, O(1D) and Cl were also examined by using an one-dimensional photochemical-diffusion model. It is suggested from this examination that the reaction of CH4 with Cl is especially important for δ13C in the stratosphere.

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