Physics
Scientific paper
Oct 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992georl..19.1923p&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 19, no. 19, p. 1923-1926.
Physics
23
Abundance, Aerosols, Atmospheric Composition, Nitrogen Dioxide, Volcanoes, Nitric Acid, Optical Paths, Philippines, Radiative Transfer
Scientific paper
Following the massive eruption of Mt. Pinatubo during June of 1991, twilight slant column abundances of NO2 were observed to decrease by 30-40 percent at Lauder, New Zealand. In this study, it is shown that nearly all of the observed decrease in twilight NO2 slant column abundance is likely to be due to heterogeneous chemistry. Airmass factors calculated with a spherical Monte Carlo radiative transfer model are shown to be relatively insensitive to the presence of the Pinatubo volcanic aerosols above about 20 km, although some significant differences are obtained below this altitude. Changes in photolysis rates due to increased scattering are also shown to have only a small effect on the total twilight NO2 column abundances.
Perliski Lori M.
Solomon Susan
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