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

Sugawara S. | Zendy; Nakazawa T. | Zendy; Shirakawa Y. | Zendy; Kawamura K. | Zendy; Aoki S. | Zendy; Machida T. | Zendy; Honda H. | Zendy

AI Assistant Blog Pricing

Home ZAIA Blog

Premium

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

Author(s) -

Sugawara S.,

Nakazawa T.,

Shirakawa Y.,

Kawamura K.,

Aoki S.,

Machida T.,

Honda H.

Publication year - 1997

Publication title -

geophysical research letters

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.007

H-Index - 273

eISSN - 1944-8007

pISSN - 0094-8276

DOI - 10.1029/97gl03044

Subject(s) - stratosphere , methane , tropopause , isotopes of carbon , fractionation , carbon fibers , isotopic ratio , analytical chemistry (journal) , diffusion , atmospheric sciences , chemistry , environmental science , environmental chemistry , isotope , total organic carbon , materials science , geology , physics , thermodynamics , nuclear physics , organic chemistry , composite number , composite material

Stratospheric air samples were collected over Japan on August 31, 1994 using a balloon‐borne cryogenic sampler and then analyzed for the CH 4 concentration and δ 13 C in CH 4 . The δ 13 C value increased from about −47.5‰ at the tropopause to about −38.9‰ at 34.7 km, accompanied by a rapid decrease of the CH 4 concentration with height. From the measured values of the CH 4 concentration and δ 13 C, the apparent carbon isotopic fractionation factor was estimated to be 1.0131±0.0006. The contributions of the chemical CH 4 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 CH 4 with Cl is especially important for δ 13 C in the stratosphere.

This content is not available in your region!

Continue researching here.

Having issues? You can contact us here

Accelerating Research