P4.5
The tropical tape recorder observed in satellite measurements of HCN
Hugh C. Pumphrey, University of Edinburgh, Edinburgh, Scotland, United Kingdom; and K. A. Walker, P. Bernath, and N. J. Livesey
The tropical tape recorder is a well-known effect in which a seasonal cycle in the mixing ratio of a gas is imposed on air entering the stratosphere and is then transported upwards by the upwelling branch of the Brewer-Dobson circulation. We report the observation of this effect in the mixing ratio of HCN, as observed by two satellite instruments: MLS on Aura and ACE-FTS. The cycle does not repeat every year; the data so far suggest that the dominant period is about two years. The reason for this periodicity is not yet understood.
Poster Session 4, General Middle Atmosphere (Poster)
Wednesday, 22 August 2007, 1:30 PM-3:30 PM, Holladay
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