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UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS Guest
2024-11-22 1:40 |
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Conference: Bucharest University Faculty of Physics 2005 Meeting
Section: Atmosphere and Earth Science; Environment Protection
Title:
Ground based measurements of stratospheric ozone in Antarctica
Authors:
Anca V. Nemuc
Affiliation:
Bucharest University, Faculty of Physics
E-mail
nemuc1@yahoo.com
Keywords:
ozone, Antarctica, stratosphere, measurements
Abstract:
The measurements of ozone data from the Amundsen-Scott South Pole Station, during 1999, will be presented and compared with 1993 and 1995 ozone data observations made in Antarctica with the same ground-based millimeter-wave spectrometer (GBMS).
Until a series of ground-based observations were begun with the GBMS during 1993, no extended ozone profiles were available in the heart of the Antarctic vortex on a continuing, regular basis through the polar winter. The GBMS has given a unique picture of ozone evaluation over the pole through the mid to upper stratosphere, using data taken as frequently as every 3 days, in 1993, but on a less frequent basis in 1995 and 1999, and has revealed behavior not previously seen.
High-resolution spectral observations of pressure-broadened emission line shapes from the molecular rotational transition at 277 GHz (close to 1 mm wavelength) have been obtained and were deconvolved against locally measured pressure and temperature profiles to retrieve ozone mixing ratio profiles with good accuracy over the altitude range 16 to 50 km. The present retrievals show upper and middle stratospheric vertical descent rates during the first half of the polar winter which are in general agreement with my earlier analyses of 1993 and 1995 data, while showing faster descent during the second half of winter. All years show apparent upper altitude descent rates which are slower than indicated by modeled diabatic descent rates over the Pole and by other measurements
Other features common to all three annual cycles for ozone are noted and discussed, including a pronounced summer-fall decline in mid-to-upper stratospheric ozone followed by an early winter recovery and a dramatic increase of stratospheric ozone during and following the vortex breakup. A double-peaked structure in southern polar stratospheric ozone is also noted in all three years of observations.
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