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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: UPPER ATMOSPHERE

Item #d92nov29

"Long-Term Variation of Stratospheric Temperature at the North Pole," R.P. Kane (Inst. Nacl. Pesquisas Especiasis, Caixa Postal 515, BR-12201 Sao José Campos, Brazil), J. Atmos. Terr. Phys., 54(9), 1139-1148, Sep. 1992.

Examination of 30 mb temperatures shows quasi-biennial oscillations, but also decreased temperatures since 1978, likely associated with greenhouse gases.

Item #d92nov30

"Possible Radioindications of Anthropogenic Influences on the Mesosphere and Lower Thermosphere," K. Serafimov (Dept. Astron., Bulgarian Acad. Sci., 72 Lenin Blvd., Sofia 1784, Bulgaria), M. Serafimova, J. Atmos. Terr. Phys., 54(7-8), 847-850, July-Aug. 1992.

Analyzes global anthropogenic influences on several ionospheric characteristics, showing that the collision frequency is the parameter that changes most when the ratio between CO₂ plus CH₄ and other components is changed. Hence ionospheric absorption may be the most sensitive ground-based indicator of global cooling of near-Earth space. Recommends a frequency range of 400 to 800 kHz.

Item #d92nov31

"Mesospheric Clouds and the Physics of the Mesopause Region," G.E. Thomas (Lab. Atmos. Phys., Univ. Colorado, Boulder CO 80309), Rev. Geophys., 29(4), 553-575, Nov. 1991.

A review of the topic, which discusses the implications of apparent secular changes in cloud brightness for global change of the entire atmosphere, and suggests needed research. (A news article in Science (p. 1488, Sep. 27, 1991) mentions this paper in relation to the possibility that increasing levels of methane are producing water vapor, leading to the increasing frequency of noctilucent clouds.)