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|Title:||The Diurnal Evolution of 222-Rn and its Progeny in the Atmospheric Boundary Layer during the Wangara Experiment|
|Authors:||VINUESA JEAN; BASU SUKANTA; GALMARINI STEFANO|
|Citation:||ATMOS. CHEM. PHYS. (DISCUSS.) vol. 7 p. 8895-8931|
|Publisher:||EUROPEAN GEOSCIENCES UNION|
|Type:||Articles in periodicals and books|
|Abstract:||The diurnal atmospheric boundary layer evolution of the 222-Rn decaying family is studied by 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 in a secular equilibrium. This study allows us to clearly analyze and identify the boundary layer processes driving the 222-Rn and its progeny concentration behaviors. The activity disequilibrium observed in the nocturnal boundary layer is due to the proximity of the radon source and the trapping of fresh 222-Rn 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 222-Rn and its progeny concentration in the unsteady growing convective boundary layer depends on the strength of entrainment events.|
|JRC Directorate:||Sustainable Resources|
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