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Observations of nitric acid perturbations in the winter Arctic stratosphere: Evidence for PSC sedimentation |
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| Authors: | Frank Arnold Veit Bürger Klaus Gollinger Michael Roncossek Johannes Schneider Stefan Spreng |
| Institution: | (1) Max-Planck-Institut für Kernphysik, Postfach 10 39 80, D-69029 Heidelberg |
| Abstract: | Gaseous nitric acid (HNO3) and hydrogene fluoride (HF) have been measured in the winter Arctic stratosphere using balloon- and aircraft-based Ion Molecule Reaction Mass Spectrometry (IMRMS) instruments. Strong HNO3 perturbations were found in 1993 and 1995 which may indicate nitrification around 11-13 km and denitrification around 20 km altitude. Most likely these perturbations were caused by sedimentation of HNO3 containing aerosols followed by aerosol evaporation at lower altitudes. |
| Keywords: | Ozone destruction nitric acid polar stratospheric clouds sedimentation denitrification/nitrification |
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