Observations of the anomalous oxygen isotopic composition of carbon dioxide in the lower stratosphere and the flux of the anomaly to the troposphere

Details Observations of the anomalous oxygen isotopic composition of carbon dioxide in the lower stratosphere and the flux of the anomaly to the troposphere Observations of the anomalous oxygen isotopic composition of carbon dioxide in the lower stratosphere and the flux of the anomaly to the troposphere

Feb 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004georl..3103109b&link_type=abstract

Geophysical Research Letters, Volume 31, Issue 3, CiteID L03109

Physics

12

Atmospheric Composition And Structure: Biosphere/Atmosphere Interactions, Atmospheric Composition And Structure: Middle Atmosphere-Composition And Chemistry, Geochemistry: Isotopic Composition/Chemistry, Global Change: Atmosphere (0315, 0325), Meteorology And Atmospheric Dynamics: Stratosphere/Troposphere Interactions

Scientific paper

Measurements of the triple oxygen isotopic composition of stratospheric CO2 in whole air samples from the NASA ER-2 aircraft show anomalous enrichments in 17O and 18O. The compact correlation of the isotope anomaly (defined as Δ17O = δ17O - 0.516 × δ18O) with simultaneous N2O measurements demonstrates that Δ17OCO2 is a long-lived tracer with a stratospheric source. These characteristics, and an isotopic link to O3 production, make Δ17OCO2 potentially useful as a tracer of integrated stratospheric chemistry and transport. The Δ17OCO2:N2O correlation is also used to estimate a net Δ17OCO2 flux to the troposphere of 3.6 +/- 0.9 × 1015‰ mol CO2 yr-1. This flux is required to predict and understand the CO2 and O2 isotope anomalies in the troposphere and their use as tracers of gross carbon exchanges between the atmosphere and biosphere on interannual to glacial-interglacial time scales.

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