A stratospheric excess of CO2-due to tropical deep convection?

Details A stratospheric excess of CO2-due to tropical deep convection? A stratospheric excess of CO2-due to tropical deep convection?

Jan 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998georl..25...63h&link_type=abstract

Geophysical Research Letters, Volume 25, Issue 1, p. 63-66

Physics

14

Atmospheric Composition And Structure: Middle Atmosphere-Composition And Chemistry, Atmospheric Composition And Structure: Troposphere-Composition And Chemistry, Meteorology And Atmospheric Dynamics: Convective Processes, Meteorology And Atmospheric Dynamics: General Circulation

Scientific paper

The `age' of stratospheric air is a measure that characterizes the time scales of stratospheric transport. In this work we present and compare age-values as determined from measurements of CO2 and SF6 on air-samples obtained between 1987 and 1995 on six flights of our balloon-borne cryo-sampler. In the middle stratosphere for five out of six flights we find age-values that are up to three years lower for CO2 than for SF6. This CO2-age anomaly corresponds to an excess of 4-5 ppm CO2. Evidence is presented that this excess-CO2 originates from rapid convective transport of near surface air. Additionally, we show that globally no compact relationship exists between the age of air and mixing-ratios of N2O.

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