Observations of the loss of stratospheric NO2 following volcanic eruptions

Details Observations of the loss of stratospheric NO2 following volcanic eruptions Observations of the loss of stratospheric NO2 following volcanic eruptions

Dec 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993georl..20.2873c&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 20, no. 24, p. 2873-2876

Physics

16

Aerosols, Atmospheric Composition, Nitrogen Dioxide, Stratosphere, Volcanoes, Absorption Spectroscopy, Abundance, Infrared Spectroscopy, Ozone Depletion, Photolysis

Scientific paper

Observations of stratospheric column amounts of nitrogen dioxide (NO2), nitric oxide (NO) and nitric acid (HNO3) have been made following major eruptions of the El Chichon and Mt. Pintatubo volcanoes. Midlatitude abundances of NO2 and NO were reduced by as much as 70% in the months following the appearance of the volcanic aerosols as compared to volcanically quite periods. There are heterogeneous reactions which could occur on the volcanic aerosols to convert NO2 into HNO3 but no commensurate increase in HNO3 column amounts was observed at the times of NO2 decrease.

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