Isotopically labeled CO(sub 2) from stratosphere: A tracer of carbon biogeochemistry.

摘要

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.