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- W1499971949 abstract "Soon after the discovery of the Antarctic ozone hole it became clear that particles in the polar stratosphere hadan infl uence on the destruction of the ozone layer. Two major types of particles, sulphate aerosols and PolarStratospheric Clouds (PSCs), provide the surfaces where fast heterogeneous chemical reactions convert inactivehalogen reservoir species into potentially ozone-destroying radicals. Lidar measurements have been used to classifythe PSCs. Following the Mt. Pinatubo eruption in June 1991 it was found that the Arctic stratosphere was loadedwith aerosols, and that aerosols observed with lidar and ozone observed with ozone sondes displayed a layeredstructure, and that the aerosol and ozone contents in the layers frequently appeared to be negatively correlated.The layered structure was probably due to modulation induced by the dynamics at the edge of the polar vortex.Lidar observations of the Mt. Pinatubo aerosols were in several cases accompanied by balloon-borne backscattersoundings, whereby backscatter measurements in three different wavelengths made it possible to obtain informationabout the particle sizes. An investigation of the infl uence of synoptic temperature histories on the physical propertiesof PSC particles has shown that most of the liquid type 1b particles were observed in the process of an ongoing,relatively fast, and continuous cooling from temperatures clearly above the nitric acid trihydrate condensationtemperature (TNAT). On the other hand, it appeared that a relatively long period, with a duration of at least 1-2 days,at temperatures below TNAT provide the conditions which may lead to the production of solid type 1a PSCs." @default.
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- W1499971949 date "2009-12-18" @default.
- W1499971949 modified "2023-09-28" @default.
- W1499971949 title "On particles in the Arctic stratosphere" @default.
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- W1499971949 doi "https://doi.org/10.4401/ag-3407" @default.
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