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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Volume 17, issue 10
Ann. Geophys., 17, 1352–1360, 1999
https://doi.org/10.1007/s00585-999-1352-2
© European Geosciences Union 1999
Ann. Geophys., 17, 1352–1360, 1999
https://doi.org/10.1007/s00585-999-1352-2
© European Geosciences Union 1999

  31 Oct 1999

31 Oct 1999

Stratospheric background aerosol and polar cloud observations by laser backscattersonde within the framework of the European project "Stratospheric Regular Sounding"

A. Adriani1, F. Cairo1, L. Pulvirenti1, F. Cardillo1, M. Viterbini1, G. Di Donfrancesco2, and J. P. Pommereau3 A. Adriani et al.
  • 1CNR − Istituto di Fisica dell'Atmosfera, Via del Fosso del Cavaliere 100, 00133 − Roma, Italy
  • E-mail: adriani@atmos.fa.rm.cnr.it
  • 2ENEA Casaccia, Dip. Ambiente, Via Anguillarese 301, 00060 − S. Maria di Galeria, RM, Italy
  • 3CNRS − Service d'Aeronomie − BP 3, 91371 Verrieres le Buisson CEDEX, France

Abstract. The Stratospheric Regular Sounding project was planned to measure regularly the vertical profiles of several tracers like ozone, water vapor, NOx, ClOx and BrOx radicals, aerosol, pressure and temperature, at three latitudes, to discriminate between the transport and photochemical terms which control their distribution. As part of this project, the "Istituto di Fisica dell'Atmosfera" launched nine laser backscattersondes (LABS) on board stratospheric balloons to make observations of background aerosol and PSCs. LABS was launched with an optical particle counter operated by the University of Wyoming. Observations have been performed in the arctic, mid-latitudes and tropical regions in different seasons. Polar stratospheric clouds have been observed in areas inside and outside the polar vortex edge. A background aerosol was observed both in mid-latitudes and in arctic regions with a backscattering ratio of 1.2 at 692 nm. Very stratified aerosol layers, possibly transported into the lower stratosphere by deep convective systems, have been observed in the lower stratosphere between 20 and 29 km in the tropics in the Southern Hemisphere.

Key words. Atmospheric composition and structure (aerosols and particles; middle atmosphere – composition and chemistry; instruments and techniques)

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