Computer Science – Sound
Scientific paper
Aug 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987esasp.270..113j&link_type=abstract
In ESA, Proceedings of the 8th ESA Symposium on European Rocket and Balloon Programs and Related Research p 113-117 (SEE N88-162
Computer Science
Sound
Atmospheric Chemistry, Atmospheric Composition, Calcium, Optical Radar, Radar Measurement, Sodium, Upper Atmosphere, Abundance, Atmospheric Models, Atmospheric Sounding
Scientific paper
Lidar measurements of Ca, Ca(+), and Na from Dec 1986 to Nov 1986 in the south of France (44N, 6E) are discussed. The Na and Ca layers are compared, emphasizing seasonal changes and mean abundances. The very small mean total Ca abundance, 27 million/sq cm, a factor 100 inferior to the Na total abundance is noted. Simultaneous detection of Ca(+) allows the determination of two major parameters: the ratio of abundances (Ca)/(Ca(+)) related to ion chemistry, and the sum (Ca) + (Ca(+)) directly related to metal source and sink processes above 86 km. The very different values for these parameters measured on Na and Ca impose high constraints on metal modeling which are not easy to meet.
Granier Claire
Jegou J. P.
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