Extended positive ion composition measurements in the stratosphere - Implications for neutral trace gases

Details Extended positive ion composition measurements in the stratosphere - Implications for neutral trace gases Extended positive ion composition measurements in the stratosphere - Implications for neutral trace gases

Sep 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981georl...8..999h&link_type=abstract

Geophysical Research Letters, vol. 8, Sept. 1981, p. 999-1001. Bundesministerium für Forschung und Technologie

Computer Science

Sound

22

Atmospheric Composition, Neutral Gases, Positive Ions, Stratosphere, Abundance, Acetonitrile, Balloon Sounding, Hydrates, Mass Spectroscopy, Vertical Distribution

Scientific paper

Results of measurements of positive ion compositions over a wide range of stratospheric heights are reported and implications for the trace gas composition of the stratosphere are discussed. The measurements were made by a balloon-borne ion mass spectrometer at altitudes between 24 and 42 km during five balloon flights from southwestern France. Proton hydrate and nonproton hydrate ions are found to coexist throughout the height range, with the total measured fractional abundances of nonproton hydrates decreasing with altitude from about 0.8 at 24 km to about 0.45 at 42 km. Consideration of the kinetics of the conversion of proton hydrates to nonproton hydrates by the stratospheric trace gases, which have been identified with CH3CN, implies that the total volume mixing ratio of the trace gas is constant below 30 km, and that the trace gas originates from heights below about 30 km to be photochemically destroyed while it is mixed into the upper stratosphere. Results point up the need for investigations of the photochemistry and sources of CH3CN, and of stratospheric ion compositions at lower heights.

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