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

FROM VOLUME 10, NUMBER 7, JULY 1997

NEWS...
RESEARCH NEWS

Item #d97jul81

Particles cause warming? Aircraft measurements presented by Peter Hobbs and colleagues at the AGU Spring Meeting show that large carbon particles, which absorb radiation, far outnumbered the more reflective sulfate particles in pollution plumes of the northeastern U.S. (See Eos, p. 260, June 24, 1997.) Theoretically, such a particle mixture would increase global warming, opposite to the conventional understanding of the impact of anthropogenic particles on climate.

Item #d97jul82

UV trend? A new analysis of surface-based UV data in the U.S. produces inconclusive results on any trend since 1974, concluding only that the existing data (from the Robertson-Berger meter network) are unsuitable for determining trends. (See Weatherhead paper, PROF. PUBS./OZONE DEPLETION/UV MEASUREMENTS, this Global Climate Change Digest issue--July 1997.

Item #d97jul83

Methyl bromide is found to be removed by biological processes in the ocean, reducing its estimated atmospheric lifetime to less than a year. (See Yvon-Lewis paper in PROF. PUBS./OZONE DEPLETION/METHYL BROMIDE, this Global Climate Change Digest issue--July 1997.)

Item #d97jul84

Ozone hole recovery: By watching changes in the vertical profile of ozone, it may be possible to detect recovery of the Antarctic ozone hole as early as the year 2008. (See Hofmann paper, PROF. PUBS./OZONE DEPLETION/DISTRIBUTION AND TRENDS, this Global Climate Change Digest issue--July 1997.)

Item #d97jul85

Aircraft exhaust particles that can destroy stratospheric ozone and alter the Earth's radiation balance can be minimized by reducing exhaust emissions of SO3, new research shows. For the past 20 years, aircraft engine designers have only been concerned with minimizing nitrogen oxides to protect ozone. (See Kärcher paper, PROF. PUBS./OZONE DEPLETION/AIRCRAFT IMPACTS, this Global Climate Change Digest issue--July 1997, and New Scientist, p. 18, Feb. 15.)