Tropical tape recorder observed in HCN

被引:24
作者
Pumphrey, H. C. [1 ]
Boone, C. [2 ]
Walker, K. A. [2 ]
Bernath, P. [2 ]
Livesey, N. J. [3 ]
机构
[1] Univ Edinburgh, Sch Geosci, Edinburgh, Midlothian, Scotland
[2] Univ Waterloo, Dept Chem, Waterloo, ON N2L 3G1, Canada
[3] NASA, Jet Propuls Lab, Pasadena, CA USA
基金
英国自然环境研究理事会;
关键词
D O I
10.1029/2007GL032137
中图分类号
P [天文学、地球科学];
学科分类号
07 ;
摘要
The tropical tape recorder is an 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 Brewer-Dobson circulation. We report the observation of this effect in the mixing ratio of HCN, as measured by two satellite instruments: MLS on Aura and ACE-FTS on SCISAT-1. 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 fully understood. Comparisons with MODIS fire-count data suggest that it may be connected to inter-annual variations in biomass burning in Indonesia and the surrounding region.
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页数:6
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