Increased concentration and vertical distribution of carbon dioxide in the stratosphere

Details Increased concentration and vertical distribution of carbon dioxide in the stratosphere Increased concentration and vertical distribution of carbon dioxide in the stratosphere

Aug 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985natur.316..708b&link_type=abstract

Nature (ISSN 0028-0836), vol. 316, Aug. 22, 1985, p. 708-710. Research supported by the Naturvetenskapliga Forskningsradet.

Computer Science

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50

Air Sampling, Atmospheric Composition, Carbon Dioxide Concentration, Man Environment Interactions, Midlatitude Atmosphere, Stratosphere, Balloon-Borne Instruments, Cryogenic Equipment, Troposphere, Vertical Distribution

Scientific paper

Experiments measuring the abundance of CO2 in the stratosphere are reviewed. Midlatitude vertical profiles of CO2 up to 35 km are reported which were measured in 1979, 1982, and 1984 by analyzing cryogenically collected balloon samples supplemented by air samples taken aboard aircraft. The profiles showed the existence of decreasing CO2 mixing ratios (7 ppmv from the tropopause to the mid-stratosphere) with elevation and an increasing CO2 stratospheric concentration with time. The decrease begins at approximately 5 km above the tropopause and is confined between 15 and 20-22 km. Above 20 km, the CO2 mixing ratio is almost constant with altitude. A growth rate between 1.0 and 1.5 ppmv/year (same as ground level) is observed at all stratospheric heights up to 35 km. In addition, the shape of the profiles suggested that excess CO2 above 20 km enters the stratosphere through tropical upwelling. Finally, it is shown that the time lag of this height region with respect to the tropospheric CO2 level is approximately 5 yr. This research may be helpful in satellite sounders.

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