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

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

doi:10.1029/97GL03044

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

S. Sugawara, T. Nakazawa, Y. Shirakawa, K. Kawamura, S. Aoki, T. Machida, H. Honda

SCI - Center for Atmospheric and Oceanic Studies

Research output: Contribution to journal › Article › peer-review

37 Citations (Scopus)

Abstract

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.

Original language	English
Article number	97GL03044
Pages (from-to)	2989-2992
Number of pages	4
Journal	Geophysical Research Letters
Volume	24
Issue number	23
DOIs	https://doi.org/10.1029/97GL03044
Publication status	Published - 1997

ASJC Scopus subject areas

Geophysics
Earth and Planetary Sciences(all)

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title = "Vertical profile of the carbon isotopic ratio of stratospheric methane over Japan",

abstract = "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.",

author = "S. Sugawara and T. Nakazawa and Y. Shirakawa and K. Kawamura and S. Aoki and T. Machida and H. Honda",

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T1 - Vertical profile of the carbon isotopic ratio of stratospheric methane over Japan

AU - Sugawara, S.

AU - Nakazawa, T.

AU - Shirakawa, Y.

AU - Kawamura, K.

AU - Aoki, S.

AU - Machida, T.

AU - Honda, H.

PY - 1997

Y1 - 1997

N2 - 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.

AB - 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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