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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 #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:, 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:, 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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