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Title: Stratospheric ozone variations in the equatorial region as seen in Stratospheric Aerosol and Gas Experiment data
Authors: Shiotani, Masato  kyouindb  KAKEN_id
Hasebe, Fumio
Author's alias: 塩谷, 雅人
Issue Date: 20-Jul-1994
Publisher: American Geophysical Union (AGU)
Journal title: Journal of Geophysical Research: Atmospheres
Volume: 99
Issue: D7
Start page: 14575
End page: 14584
Abstract: An analysis is made of equatorial ozone variations for 5 years, 1984–1989, using the ozone profile data derived from the Stratospheric Aerosol and Gas Experiment II (SAGE II) instrument. Attention is focused on the annual cycle and also on interannual variability, particularly the quasi-biennial oscillation (QBO) and El Niño-Southern Oscillation (ENSO) variations in the lower stratosphere, where the largest contribution to total column ozone takes place. The annual variation in zonal mean total ozone around the equator is composed of symmetric and asymmetric modes with respect to the equator, with maximum contributions being around 19 km for the symmetric mode and around 25 km for the asymmetric mode. The persistent zonal wavenumber 1 structure observed by the total ozone mapping spectrometer over the equator is almost missing in the SAGE-derived column amounts integrated in the stratosphere, suggesting a significant contribution from tropospheric ozone. Interannual variations in the equatorial ozone are dominated by the QBO above 20 km and the ENSO-related variation below 20 km. The ozone QBO is characterized by zonally uniform phase changes in association with the zonal wind QBO in the equatorial lower stratosphere. The ENSO-related ozone variation consists of both the east-west vacillation and the zonally uniform phase variation. During the El Niño event, the east-west contrast with positive (negative) deviations in the eastern (western) hemisphere is conspicuous, while the decreasing tendency of the zonal mean values is maximum at the same time.
Rights: © 1994 American Geophysical Union. Further reproduction or electronic distribution is not permitted.
DOI(Published Version): 10.1029/94JD00741
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