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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 7, NUMBERS 11-12, NOVEMBER-DECEMBER 1994

PROFESSIONAL PUBLICATIONS... OF GENERAL INTEREST: SCIENCE

Item #d94nov7

"Global Climate Change and Tropical Cyclones," J. Lighthill (Dept. Mathematics, Univ. College, Gower St., London WC1E 6BT, UK), G. Holland et al., Bull. Amer. Meteor. Soc., 75(11), 2147-2157, Nov. 1994.

Used two methodologies to assesss the consequences of doubled CO2 over the next 60-70 years on the frequency and intensity of tropical cyclones. Neither method showed any significant changes; and although minor, indirect effects cannot be excluded, they would be swamped by large natural variability.

Item #d94nov8

"Role of the Thermohaline Circulation in the Abrupt Warming after Heinrich Events," D. Paillard (Lab. Modél. Clim. & Environ., CEA-DSM, Ctr. d'études de Saclay, Orme des merisiers, Gif-sur-Yvette, F-91191, France), L. Labeyrie, Nature, 372(6502), 162-164, Nov. 10, 1994.

Bond has proposed a mechanism involving the thermohaline ocean circulation to explain the climatic warmings that typically followed Heinrich events--recurrent depositions of ice-rafted mineral debris apparently related to massive discharges of icebergs. The authors test this idea with a simple ocean model coupled to a model of a periodically surging ice sheet, and reproduce the qualitative features of climate oscillations seen in ice core and ocean records.

Item #d94nov9

"New Evidence for Ozone Depletion in the Upper Atmosphere," H. Claude (Meteor. Observatory, A. Schwaiger Weg 10, D 82383 Hohenpeissenberg, Ger.), F. Schönenborn et al., Geophys. Res. Lett., 21(22), 2409-2412, Nov. 1, 1994.

Differential absorption lidar measurements made from 1987 to 1993 at Hohenpeissenberg show an ozone decrease between 32 and 42 km that peaked at -1.7% at 39 km altitude. This depletion is higher than reported by SAGE II or SBUV, but agrees well with results from Umkehr measurements. The agreement with photochemical models indicates the depletion is most likely caused by catalytic ozone destruction through anthropogenic chlorine.

Item #d94nov10

"The One Hundredth Year of Rudolf Wolf's Death: Do We Have the Correct Reconstruction of Solar Activity?" D.V. Hoyt (Res. & Data Sys. Corp., 7855 Walker Dr., S. 460, Greenbelt MD 20770), K.H. Schatten, E. Nesmes-Ribes, ibid., 21(18), 2067-2070, Sep. 1, 1994.

Assembles observations made by more than 350 observers between 1610 and 1993 into a homogeneous record of sunspot activity, revising the sunspot number reconstruction of Wolf in the 19th century. Some trends differ significantly from Wolf's record.