Szczegóły publikacji
Opis bibliograficzny
Factors controlling temporal variability of near-ground atmospheric $^{222}Rn$ concentration over central Europe / M. ZIMNOCH, P. WACH, Ł. CHMURA, Z. GORCZYCA, K. RÓŻAŃSKI, J. Godlowska, J. Mazur, K. Kozak, A. Jeričević // Atmospheric Chemistry and Physics ; ISSN 1680-7316. — 2014 — vol. 14 iss. 18, s. 9567–9581. — Bibliogr. s. 9580–9581, Abstr. — Ł. Chmura – dod. afiliacja: Institute of Meteorology and Water Management, National Research Institute
Autorzy (9)
- AGHZimnoch Mirosław
- AGHWach-Jankowska Paulina
- AGHChmura Łukasz
- AGHGorczyca Zbigniew
- AGHRóżański Kazimierz
- Godlowska J.
- Mazur J.
- Kozak K.
- Jeričević A.
Dane bibliometryczne
| ID BaDAP | 87129 |
|---|---|
| Data dodania do BaDAP | 2015-02-13 |
| Tekst źródłowy | URL |
| DOI | 10.5194/acp-14-9567-2014 |
| Rok publikacji | 2014 |
| Typ publikacji | artykuł w czasopiśmie |
| Otwarty dostęp |  |
| Czasopismo/seria | Atmospheric Chemistry and Physics |
Abstract
Concentration of radon (Rn-222) in the near-ground atmosphere has been measured quasi-continuously from January 2005 to December 2009 at two continental sites in Europe: Heidelberg (south-west Germany) and Krakow (southern Poland). The atmosphere was sampled at ca. 30 and 20m above the local ground. Both stations were equipped with identical instruments. Regular observations of Rn-222 were supplemented by measurements of surface fluxes of this gas in the Krakow urban area, using two different approaches. The measured concentrations of Rn-222 varied at both sites in a wide range, from less than 2.0 Bqm(-3) to approximately 40 Bqm(-3) in Krakow and 35 Bqm(-3) in Heidelberg. The mean Rn-222 content in Krakow, when averaged over the entire observation period, was 30% higher than in Heidelberg (5.86 +/- 0.09 and 4.50 +/- 0.07 Bqm(-3), respectively). Distinct seasonality of Rn-222 signal is visible in the obtained time series of Rn-222 concentration, with higher values recorded generally during late summer and autumn. The surface Rn-222 fluxes measured in Krakow also revealed a distinct seasonality, with broad maximum observed during summer and early autumn and minimum during the winter. When averaged over a 5-year observation period, the night-time surface Rn-222 flux was equal to 46.8 +/- 2.4 Bqm(-2) h(-1). Although the atmospheric Rn-222 levels at Heidelberg and Krakow appeared to be controlled primarily by local factors, it was possible to evaluate the "continental effect" in atmospheric Rn-222 content between both sites, related to gradual build-up of Rn-222 concentration in the air masses travelling between Heidelberg and Krakow. The mean value of this build-up was equal to 0.78 +/- 0.12 Bqm(-3). The measured minimum Rn-222 concentrations at both sites and the difference between them was interpreted in the framework of a simple box model coupled with HYSPLIT (Hybrid Single Particle Lagrangian Integrated Trajectory) analysis of air mass trajectories. The best fit of experimental data was obtained for the mean Rn-222 flux over the European continent equal to 52 Bqm(-2) h(-1), the mean transport velocity of the air masses within the convective mixed layer of the planetary boundary layer (PBL) on their route from the Atlantic coast to Heidelberg and Krakow equal to 3.5ms(-1), the mean rate constant of Rn-222 removal across the top of the PBL equal to the Rn-222 decay constant and the mean height of the convective mixed layer equal to 1600 m.
