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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 9, NUMBER 9, SEPTEMBER 1996PROFESSIONAL PUBLICATIONS...
TREND ANALYSIS: ATMOSPHERIC CHEMISTRY
Item #d96sep69
 "Ice Core Data of
Atmospheric Carbon Monoxide over Antarctica and Greenland During the Last 200
Years," D. Haan (Lab. Glaciol. & Geophys., BP 96, 38402 St. Martin d'Hères
Cedex, France; e-mail: denis@glaciog.grenet.fr), P. Martinerie, D. Raynaud, Geophys.
Res. Lett.,
23(17), 2235-2238, Aug. 15, 1996.
Reports the first polar ice core CO measurements that are compatible with
atmospheric data, made in Greenland and Antarctica. Around 1850, the CO
concentration over Greenland started to increase; by contrast, the high southern
latitude concentrations were fairly constant from 1860 to 1916. The Greenland
results suggest that simulations of preindustrial CO distribution could have
underestimated CO concentrations mainly in the Northern Hemisphere, leading to
an overestimate of the change since preindustrial times, and to an underestimate
of the past interhemispheric CO gradient.
Item #d96sep70
"The Regime of
Decreased OH Vertical Column Abundances at Fritz Peak Observatory, CO:
1991-1995," C.R. Burnett (Fritz Peak Observ., POB 59, Rollinsville CO
80474; e-mail: burnett@al.noaa.gov), E.B. Burnett, Geophys. Res. Lett.,
23(15), 1925-1927, July 15, 1996.
These data exhibit a relatively abrupt change in seasonal behavior from 1991
through 1995. Late summer-early fall abundances then are significantly below the
comparable 1980-1990 seasonal average. Continuing observations will clarify the
temporary or long-term nature of this recent regime.
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