Physics
Scientific paper
Mar 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987jatp...49..299g&link_type=abstract
Journal of Atmospheric and Terrestrial Physics (ISSN 0021-9169), vol. 49, March 1987, p. 299-302.
Physics
1
Air Sampling, Atmospheric Composition, Bromine, Inorganic Compounds, Particulate Sampling, Stratosphere, Air Filters, Balloon Flight, Chlorine Compounds
Scientific paper
Inorganic bromine content in the lower stratosphere was determined from a series of three balloon flights conducted in 1981 and 1982 from Holloman AFB, New Mexico. A Direct Flow Sampler sampled large quantities of stratospheric air through a 35 cm diameter filter mounted upstream of a blower. Filters were prepared with an inert organic oil and a strong organic base in order to capture both acidic and particulate species. Following flight, the filters underwent an extraction process. Then, aliquots of the solution were subjected to neutron activation analysis. The methodology involved a radiochemical procedure which was developed and tested to measure, simultaneously, both chlorine and bromine content. High-resolution gamma spectrometry was used and bromine content was determined by counting Br-80 activity. The resulting values for volume mixing ratios of bromine increased from a low of 2.6 pptv at 15 km to a high of 15.6 pptv for the 25-30 km band. The results are shown to be in agreement with earlier measurements by Sedlacek et al. (1984) and with one-dimensional photochemical model predictions by Yung et al. (1980).
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