Increased chlorine dioxide over Antarctica caused by volcanic aerosols from Mount Pinatubo
Article Abstract:
Record volumes of sulphur compounds accumulated in the stratosphere as a result of the eruption of Mount Pinatubo in Jun 1991. This phenomenon is believed to have promoted atmospheric processes that contribute to ozone layer depletion. A comparison of Antarctic chlorine dioxide abundances during the autumn and winter of 1991 and 1992 revealed that in the latter year, dramatic increases in chlorine dioxide levels occurred during the autumn. Model calculations point to chlorine nitrate activation on aerosol surfaces as the cause of this sudden depletion. These indicate that aerosols from Mount Pinatubo might have promoted the unprecedented magnitude of ozone depletion during 1992.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1993
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Observation and possible causes of new ozone depletion in Antarctica in 1991
Article Abstract:
The 50% decline in stratospheric ozone levels over Antarctica at the 11-13 and 25-30 kilometer regions in the spring of 1991 may have been brought on by the release of aerosol particles from the volcanic eruption of Mount Hudson in Aug 1991. The 50% loss, measured over the South Pole and McMurdo Stations, produced a total ozone column that was 10 to 15% less than in earlier years. Mount Hudson's eruption just before this sudden dip in ozone levels strongly suggests that volcanic activity contributed to the decline.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1992
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Increase in lower-stratospheric water vapour at a mid-latitude Northern Hemisphere site from 1981 to 1994
Article Abstract:
An analysis of watervapour profiles for atmospheric altitude ranging from 9 to 27 kilometers obtained during the period 1981 to 1994 in Boulder, CO, reveals that there is an increase in the lower stratospheric water-vapour concentration. The increase in concentration is very large in the altitude range from 20 to 25 kilometers. This increase in water vapor concentration is attributed to global temperature rise and the greenhouse effect.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1995
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