February 28, 2007
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A Guide to Information on Greenhouse Gases and Ozone Depletion
Published July 1988 through June 1999
FROM VOLUME 9, NUMBER 9, SEPTEMBER 1996
OZONE DEPLETION: OZONE DISTRIBUTION & TRENDS
"Record Low Ozone
at Mauna Loa Observatory During Winter 1994-1995: A Consequence of Chemical and
Dynamical Synergism?" D.J. Hofmann (CMDL, NOAA, 325 Broadway, Boulder CO
80303), S.J. Oltmans et al., Geophys. Res. Lett., 23(12),
1533-1536, June 1, 1996.
During two days in late December 1994, total ozone over Mauna Loa dropped
below 200 Dobson Units for the first time since these measurements began over 30
years ago. Except for rare occasions in southern Argentina, total ozone values
this low have not been recorded over populated areas. Although chemical ozone
depletion could have contributed, the minimum appears to be related to ozone
transport from the tropics and the timing of the phase transition of the
Quasi-Biennual Oscillation in stratospheric winds. This analysis provides an
accurate method of forecasting low-ozone, high-UV winters in Hawaii.
Evolution of the Antarctic Ozone Hole," Y. Jiang (Div. Geol. &
Planetary Sci., California Inst. Technol., Pasadena CA 91125), Y.L. Yung, R.W.
Zurek, J. Geophys. Res., 101(D4), 8985-8999, Apr. 20, 1996.
Ozone column amounts are analyzed during late austral winter and spring for
1980-1991 using area-mapping techniques and area-weighted vortex averages. A
significant decline is evident in the earlier part of the decade, apparently due
to the rise anthropogenic chlorine. A slower decline at the end of the decade
indicates saturation of ozone depletion in the vortex interior, where chlorine
amounts were already high enough to deplete most of the ozone.
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