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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 5, NUMBER 11, NOVEMBER 1992

PROFESSIONAL PUBLICATIONS...
TREND ANALYSIS: SOLAR RADIATION AND UV


Item #d92nov36

"Estimating the Sun's Radiative Output during the Maunder Minimum," J. Lean (Code 4165L, Naval Res. Lab., Washington DC 20375), Geophys. Res. Lett., 19(15), 1591-1594, Aug. 3, 1992.

Based on understanding of the variations in total solar irradiance and in Ca II emission from the Sun and stars, estimates that solar irradiance was 24% below present during the Maunder Minimum in solar magnetic activity (1645-1715 A.D.). This would have caused a global cooling of 0.2-0.6 C, which compares with the roughly 1 C cooling of the Little Ice Age.


Item #d92nov37

"Influence of Clouds on the Detectability of Trends in the UV-B Irradiance Caused by Reduction of the Total Ozone Content," A.V. Belyavskii (Central Aerol. Observ., Dolgoprudnyi Ukrainian Regional Sci. Res. Hydrometeor. Inst. (USRHI), Kiev, Ukraine), Atmos. Opt., 4(9), 692-696, Sep. 1991.

Detectability of trends in UV-B irradiance and their significance for biological systems are estimated from synchronous measurements of the total ozone content and UV-B irradiance. Concludes that the predicted catastrophic consequences of ozone depletion are at least disputable.

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