As globe warms, atmosphere may shrink
The height of the upper atmosphere has dropped over the last 40 years, possibly because of greenhouse warming.
References:
Jarvis, M.J., B. Jenkins, and G.A. Rodgers. 1998. Southern hemisphere observations of a long-term decrease in F region altitude and thermospheric wind providing possible evidence for global thermospheric cooling. Journal of Geophysical Research 103(Sept. 1):20,774.
Further Readings:
Ulich, T., and E. Turunen. 1997. Evidence for long-term cooling of the upper atmosphere in ionosonde data. Geophysical Research Letters 24(May 1):1103.
Upadhyay, H.O., and K.K. Mahajan. 1998. Atmospheric greenhouse effect and ionospheric trends. Geophysical Research Letters 25(Sept. 1):3375.
Sources:
Guy P. Brasseur
National Center for Atmospheric Research
Atmospheric Chemistry Division
P.O. Box 3000
Boulder, CO 80307-3000Martin J. Jarvis
British Antarctic Survey
Natural Environment Research Council
High Cross, Madingley Road
Cambridge CB3 0ET
EnglandThomas Ulich
Geophysical Observatory
FIN-99600 Sodankylä
Finland
From Science News, Vol. 154, No. 13, September 26,
1998, p. 199.
Copyright Ó 1998 by Science Service.
9/26/98
copyright 1998 ScienceService