Stratospheric ClONO 2 and HNO 3 profiles inside the Arctic vortex from MIPAS‐B limb emission spectra obtained during EASOE
1994; American Geophysical Union; Volume: 21; Issue: 13 Linguagem: Inglês
10.1029/93gl01303
ISSN1944-8007
AutoresH. Oelhaf, T. von Clarmann, H. Fischer, Felix Friedl-Vallon, Ch. Fritzsche, A. Linden, C. Piesch, Meinhard Seefeldner, W. Völker,
Tópico(s)Atmospheric and Environmental Gas Dynamics
ResumoVertical profiles of ClONO 2 and HNO 3 inside the Arctic vortex have been retrieved from infrared limb emission spectra recorded during balloon flights on January 13 and in the night of March 14/15, 1992 from Esrange, Sweden (68°N) as part of the European Arctic Stratospheric Ozone Experiment (EASOE). The instrumentation used was the cryogenic M ichelson I nterferometer for P assive A tmospheric S ounding, B alloon‐borne version (MIPAS‐B). Low ClONO 2 abundances in mid‐January indicate that a significant portion of ClONO 2 had already been converted at that time. An unexpectedly high ClONO 2 amount (1.8 to 3.1 ppbv between 16.1 and 21.5 km altitude) has been inferred from the March flight data. This implies that obviously most of the total available chlorine (ClO y ) in the lower stratosphere was then in this reservoir molecule. The measured HNO 3 profiles give no hint of any significant layered removal of gaseous HNO 3 by condensation on particles or/and sedimentation.
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