Isotopically labeled CO{sub 2} from stratosphere: A tracer of carbon biogeochemistry

Technical Report · Mon Nov 01 04:00:00 EST 1993

DOI:https://doi.org/10.2172/10104790· OSTI ID:10104790

Yung, Yuk L ^[1]; Thiemens, M H ^[2]

---

1. California Inst. of Tech., Pasadena, CA (United States). Div. of Geological and Planetary Sciences
2. California Univ., San Diego, CA (United States)

It has been recently discovered that it the stratosphere is a source of isotopically enriched CO{sub 2}: CO{sup 18}O and CO{sub 17}O. The cause of this isotopic enrichment is exchange between heavy O{sub 3} and CO{sub 2} via the excited radical O({sup 1D}). The research effort consists of a coordinated laboratory and model surfaces of isotopomers of CO{sub 2}. The laboratory study yields data on the chemical kinetics of oxygen exchange between CO{sub 2} and O{sub 3}. The modeling study uses the laboratory results as well as atmospheric measurements to model the source and sinks of CO{sub 2} isotopomers in the stratosphere and troposphere. It is expected that this combined study will bring new insights on the exchange of CO{sub 2} between the atmosphere and the biosphere. The goals of this study are to study the kinetic pathways for isotopic exchange between O{sub 2} and CO{sub 2} and to study O{sub 3}: the exchange rate of isotopically labelled CO{sub 2} between the stratosphere and the troposphere.

• Research Organization: California Univ., San Diego, CA (United States)
• Sponsoring Organization: USDOE, Washington, DC (United States)
• DOE Contract Number: FC03-90ER61010
• OSTI ID: 10104790
• Report Number(s): DOE/ER/61010--T14; ON: DE94002777; BR: KP0500000
• Country of Publication: United States
• Language: English

Related Subjects

54 ENVIRONMENTAL SCIENCES
540120
ATMOSPHERIC CHEMISTRY
CARBON DIOXIDE
CHEMICALS MONITORING AND TRANSPORT
ISOTOPIC EXCHANGE
STRATOSPHERE