Transport of air in the stratosphere as revealed by radioactive tracers

Bhandari, Narendra (1970) Transport of air in the stratosphere as revealed by radioactive tracers Journal of Geophysical Research: Oceans, 75 (15). pp. 2927-2930. ISSN 0148-0227

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The available measurements on cosmogenic 7Be and artificial tracers 109Cd and 238Pu in the atmosphere are discussed in terms of plausible circulation patterns in the stratosphere and across the stratopause. The 7Be data in the northern hemisphere between 24 and 37 km, when integrated with the aircraft data from lower altitudes, suggest an equatorward transport of polar air above 25 km during the winter of 1965. Such a motion does not seem to be operative below 24 km. There are cyclic variations in the concentration of 109Cd and 238Pu in both hemispheres which are out of phase by about six months; in early spring through summer, the concentrations are repeatedly higher than in the fall and winter during 1962-1965 at 34°S and 31°N. These data indicate that the transport across the stratopause is strongly seasonal and probably takes place during an extended spring period. A detailed analysis of tracers injected in the mesosphere further suggests that the dispersion history of the debris injected in the mesosphere strongly depends on the time of injection.

Item Type:Article
Source:Copyright of this article belongs to American Geophysical Union.
ID Code:18440
Deposited On:17 Nov 2010 09:08
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