Changes in the character of polar stratospheric clouds over Antarctica in 1992 due to the Pinatubo volcanic aerosol

Details Changes in the character of polar stratospheric clouds over Antarctica in 1992 due to the Pinatubo volcanic aerosol Changes in the character of polar stratospheric clouds over Antarctica in 1992 due to the Pinatubo volcanic aerosol

Feb 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994georl..21..273d&link_type=abstract

Geophysical Research Letters, Volume 21, Issue 4, p. 273-276

Physics

23

Atmospheric Composition And Structure: Aerosols And Particles, Atmospheric Composition And Structure: Volcanic Effects, Atmospheric Composition And Structure: Middle Atmosphere-Composition And Chemistry, Atmospheric Composition And Structure: Cloud Physics And Chemistry

Scientific paper

Vertical profiles of aerosol concentration were measured on 8 occasions from McMurdo Station, Antarctica (78°S), between late August and early October 1992. Polar stratospheric clouds (PSCs) were observed on 6 of these soundings. The characteristics of PSCs, and ozone, were quite different above and below about 16 km. Above 16 km PSCs were variable in time, with particles >1.0 μm radius contributing significantly to the surface area, generally <8 μm2cm-3. Below 16 km PSCs were much more stable and were dominated by high concentrations of smaller particles, <1.0 μm, with surface areas of 20-30 μm2cm-3. This lower layer coincided with the altitude of the primary Pinatubo volcanic aerosol as measured in mid September and October, and with the 4 km region of the atmosphere where ozone was virtually completely destroyed over Antarctica in 1992.

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