February 28, 2007
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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 8, NUMBER 10, OCTOBER 1995
OF GENERAL INTEREST: TREND ANALYSES
"Trends in High-Frequency Climate Variability in the Twentieth
Century," T.R. Karl (NCDC, NOAA, 151 Patton Ave., Asheville NC 28801), R.W.
Knight, N. Plummer, Nature, 377(6546), 217-220, Sep. 21, 1995.
Climate simulations incorporating increased greenhouse-gas concentrations
indicate that a warmer climate could result in a decrease in high-frequency
temperature variability and an increase in the proportion of precipitation
occurring in extreme events. This study analyzed temperature and precipitation
data over the past 30 to 80 years from hundreds of sites in Australia, China,
the former Soviet Union and the U.S. Day-to-day temperature variability is seen
to have decreased in the Northern Hemisphere, and (at least in the U.S.) the
proportion of precipitation contributed by extreme, one-day events has
"Decline in Atmospheric Carbon Monoxide Raises Questions About Its
Cause," M.A.K. Khalil (Global Change Res. Ctr., Oregon Graduate Inst.,
Beaverton OR 97006), Eos, 76(36), 353-354, Sep. 5, 1995.
Following a sharp increase in the 1980s, probably due to a rise in
anthropogenic sources, atmospheric concentrations of carbon monoxide (CO) are
now declining. This recent trend is also probably a result of human activities,
and may reflect a slowdown in biomass burning. Theories explaining trends in CO
are briefly summarized. Should CO increase, atmospheric levels of the hydroxyl
radical could be reduced, compromising the ability of the atmosphere to remove
pollutants such as CFCs.
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