The radon cycle and its daughters - an application to the study of troposphere-stratosphere exchanges

Details The radon cycle and its daughters - an application to the study of troposphere-stratosphere exchanges The radon cycle and its daughters - an application to the study of troposphere-stratosphere exchanges

Dec 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982ang....38..497l&link_type=abstract

Annales de Geophysique (ISSN 0003-4029), vol. 38, Oct.-Dec. 1982, p. 497-531. In French.

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Atmospheric Composition, Bismuth Isotopes, Gas Exchange, Lead Isotopes, Polonium 210, Radon, Stratosphere, Troposphere, Aerosols, Atmospheric Models, Northern Hemisphere, Oceans, Southern Hemisphere, Vertical Distribution

Scientific paper

The global activities of the natural radioactive nuclides Rn-222, Pb-210, Bi-210, and Po-210 in the whole atmosphere are studied. A two-box model which assumes the existence of a steady state for the whole atmosphere is employed since the residence times of the aerosols and air masses are different in the troposphere and in the stratosphere. In each reservoir, the production of a nuclide by radioactive decay of its precursor is balanced simultaneously by its own radioactivity, by the flux of atoms transferred to or from the other reservoir, and in the case of the troposphere, by scavenging. The model is used to consider an unknown emanation of Rn-222 from the soil of the continents and also the existence of possible volcanic sources for each nuclide. Among other results, it is found that the Rn-222 emanation rate from the surface of the continents is 0.72 atom/sq cm-sec, and about 2 percent of this flux is able to reach the stratosphere. The scavenging constant of the submicronic aerosols in the troposphere is determined to be 0.00011/min, which corresponds to a mean residence time of 6.5 days in the global troposphere. The flux of air exchanged across the tropopause is determined to be between 4.2-9 x 10 to the 12th kg/min, which corresponds to a mean residence time in the stratosphere between 0.23-0.50 year.

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