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Global Climate Change Digest

A Guide to Information on Greenhouse Gases and Ozone Depletion
Published July 1988 through June 1999



Item #d93sep12

"Record Low Total Ozone During Northern Winters of 1992 and 1993," R.D. Bojkov (World Meteor. Org., POB 5, CH-1211 Geneva 20, Switz.), C.S. Zerefos et al., Geophys. Res. Lett., 20(13), 1351-1354, July 9, 1993.

The last two winter-spring seasons had the lowest ever total ozone over the regions of North America, Europe and Siberia between 45·N and 65·N. Ozone was 11-13% below the long-term average, bringing the cumulative ozone decline in that latitude belt since the winter/spring of 1969/70 to about 14%. Possible chemical and dynamical contributions to the low levels are discussed.

Item #d93sep13

"What-Ifs for a Northern Ozone Hole," A. Newman, Environ. Sci. Technol., 27(8), 1488-1491, Aug. 1993.

A summary of several intriguing possibilities that could lead to further significant ozone losses, particularly in a greenhouse-warmed world, from a feature lecture by J.D. Mahlman at the latest American Geophysical Union meeting.

Item #d93sep14

"Solar Ultraviolet Irradiance Observed from Southern Argentina: September 1990 to March 1991," J.E. Frederick (Dept. Geophys. Sci., Univ. Chicago, Chicago IL 60637), P.F. Soulen et al., J. Geophys. Res., 98(D5), 8891-8897, May 20, 1993.

Observations at a populated region (latitude 55·S) extended through a season of prolonged depletion in column ozone over Antarctica. After removing the effect of clouds, irradiance at wavelengths between 300 and 310 nm was enhanced up to 45% at noon during December relative to clear sky calculations based on ozone climatology. (See research News.)

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