Mathematics – Logic
Scientific paper
Mar 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999georl..26..607l&link_type=abstract
Geophysical Research Letters, Volume 26, Issue 5, p. 607-610
Mathematics
Logic
10
Atmospheric Composition And Structure: Troposphere-Constituent Transport And Chemistry, Atmospheric Composition And Structure: Instruments And Techniques, Atmospheric Composition And Structure: Biosphere/Atmosphere Interactions
Scientific paper
Activity concentration profiles of the short-lived radon isotope 220Rn (half-life 56 seconds) in the lowest 50 cm above the soil are used to study near-surface gas transport processes. The experimental data are compared to profiles calculated by solving the one-dimensional diffusion equation for radioactive atoms with a linear increase of the eddy diffusion coefficient K with altitude according to K(z)=K0+Kzz. The slope Kz in this model and the radon flux from the surface are continuously calculated from the activity measurements in time steps of one hour. Transport times for Rn atoms from an altitude z1=5cm to an altitude z2=20cm are typically between one and two minutes in stable meteorological conditions when the friction velocity u* is below 0.1 m/s.
Gut Andreas
Lehmann Bernhard E.
Lehmann Martin
Neftel Albrecht
Tarakanov Sergei V.
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