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| Titel |
The diurnal evolution of ²²²Rn and its progeny in the atmospheric boundary layer during the Wangara experiment |
| VerfasserIn |
J.-F. Vinuesa, S. Basu, S. Galmarini |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7316
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 7, no. 18 ; Nr. 7, no. 18 (2007-09-28), S.5003-5019 |
| Datensatznummer |
250005207
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| Publikation (Nr.) |
 copernicus.org/acp-7-5003-2007.pdf |
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| Zusammenfassung |
| The diurnal atmospheric boundary layer evolution of the 222Rn decaying
family is studied using a state-of-the-art large-eddy simulation model. In
particular, a diurnal cycle observed during the Wangara experiment is
successfully simulated together with the effect of diurnal varying turbulent
characteristics on radioactive compounds initially in a secular equilibrium.
This study allows us to clearly analyze and identify the boundary layer
processes driving the behaviour of 222Rn and its progeny concentrations.
An activity disequilibrium is observed in the nocturnal boundary layer due to
the proximity of the radon source and the trapping of fresh 222Rn close
to the surface induced by the weak vertical transport. During the morning
transition, the secular equilibrium is fast restored by the vigorous
turbulent mixing. The evolution of 222Rn and its progeny concentrations
in the unsteady growing convective boundary layer depends on the strength of
entrainment events. |
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