Physics
Scientific paper
Oct 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990georl..17.1905s&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 17, Oct. 1990, p. 1905-1908.
Physics
32
Atmospheric Composition, Hydroxyl Radicals, Laser Induced Fluorescence, Metal Vapor Lasers, Stratosphere, Copper, Dye Lasers, Free Radicals, Nitrogen Oxides
Scientific paper
Stratospheric OH and HO2 radical densities have been measured between 36 and 23 km using a balloon-borne, in situ instrument launched from Palestine, Texas on August 25, 1989. OH is detected using the laser-induced fluorescence technique (LIF) employing a Cu-vapor-laser pumped dye laser coupled with an enclosed-flow detection chamber. HO2 is detected nearly simultaneously by adding NO to the sample flow to convert ambient HO2 to OH. Observed OH and HO2 densities ranged from 8.0 + or - 2.8 x 10 to the 6th and 1.4 + or - 0.5 x 10 to the 7th molec/cu cm, respectively, at 36 km, to 1.4 + or - 0.5 x 10 to the 6th and 3.0 + or - 1.0 x 10 to the 6th at 23 km, where the uncertainty is + or - sigma. The HO2 density exhibits a maximum in the 34-30 km region of 1.7 + or - 0.6 x 10 to the 7th. The data were obtained over a solar zenith angle variation of 51 deg at 36 km to 61 deg at 23 km. O3 and H2O densitites also were measured simultaneously with separate instruments.
Anderson James G.
Lapson L. B.
Stimpfle R. M.
Wennberg Paul O.
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