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Estimation of nocturnal 222Rn soil fluxes over Russia from TROICA measurements

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Brenninkmeijer,  C. A. M.
Atmospheric Chemistry, Max Planck Institute for Chemistry, Max Planck Society;

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Citation

Berezina, E. V., Elansky, N. F., Moiseenko, K. B., Belikov, I. B., Shumsky, R. A., Safronov, A. N., et al. (2013). Estimation of nocturnal 222Rn soil fluxes over Russia from TROICA measurements. Atmospheric Chemistry and Physics, 13(23), 11695-11708.


Cite as: http://hdl.handle.net/11858/00-001M-0000-0015-8909-7
Abstract
In TROICA (TRanscontinental Observations Into the Chemistry of the Atmosphere) campaigns (1999-2008), the simultaneous observations of near surface Rn-222 concentrations and atmospheric boundary layer thermal structure were performed along the Trans-Siberian Railway across northern Eurasia from Moscow to Vladivostok, including central, southern and far eastern parts of Russia. The data on Rn-222 and temperature vertical distribution are used to estimate Rn-222 regional scale soil fluxes based on calculations of nocturnal Rn-222 accumulation rates in the surface layer under inversion conditions. An effect of seasonal soil thawing on 2-4 times surface Rn-222 concentration increase from summer 1999 to autumn 2005 is observed. The estimated Rn-222 regional averaged fluxes vary over Russia from 29 +/- 8 mBq m(-2) s(-1) in its so-called European territory to 95 +/- 51 mBq m(-2) s(-1) in the southern area of Siberia. The highest Rn-222 fluxes are derived in the regions of high tectonic activity and orogenic belts of central and eastern Siberia and in far eastern Russia. The observed high Rn-222 flux variations in specific events show a strong effect of both soil and atmospheric conditions on Rn-222 near-surface abundance and the derived seasonal patterns over the continent.