Deposition velocities and washout ratios on a coastal site (southeastern Spain) calculated from 7Be and 210Pb measurements

Comparative trends and seasonal variation of 7Be, 210Pb and 137Cs at two altitude sites in the central part of France

“…A similar, but less pronounced seasonal variation was also measured at Opme. Similar seasonal variation was observed in Europe (Dueñas et al, 2004(Dueñas et al, , 2005Daish et al, 2005;Todorovic et al, 2005). However, the majority of studies reported a maximum in the winter and a minimum in the summer: in Germany (Winkler et al, 1998), Estonia (Realo et al, 2007), Finland (Paatero et al, 1998), the Ivory Coast (Nho et al, 1996), and in Italy (Vecchi et al, 2005).…”

Po-210 and Pb-210 as atmospheric tracers and global atmospheric Pb-210 fallout: a Review

“…A large variations in the deposition velocity based on 210 Pb, between 0.1 cm s À1 to 5.0 cm s À1 have been reported, although the average values agree within a factor of w3 (0.6 to 1.9 cm s À1 ; Turekian et al, 1983;Graustein and Turekian, 1986;Todd et al, 1989;Anand and Rengarajan, 1990;Beks et al, 1998;Hussain et al, 1998;Winkler and Rosner, 2000;McNeary andBaskaran, 2003, 2007;Dueñas et al, 2005). There was no significant correlation between the total deposition velocities derived from either 210 Pb or 210 Po and the total particulate matter collected onto the filter which suggests that the aerosol mass does not control the amount of 210 Pb scavenged by aerosols (McNeary and Baskaran, 2003;Dueñas et al, 2005). McNeary and Baskaran (2003) proposed that only a small portion of the aerosols scavenges effectively 210 Pb from the atmosphere and a major portion of the aerosols do not actively Table 1.…”

“…Based on 30-year (1967e1996) long series of daily 210 Pb measurements in Finland, Paatero et al (1998) observed that daily variations are due to synoptic-scale weather situations while the seasonal variations are attributed to the efficiency of vertical mixing of the lower atmosphere. However, there are sites where higher 210 Pb in the summer months have also been reported (e.g., in Spain, Garcia-Talavera et al, 2001;Azahra et al, 2004a;Dueñas et al, 2005Dueñas et al, , 2009). …”

“…High 210 Pb activities have been reported in Milan, Italy when prolonged anti-cyclonic conditions with high air temperature existed (Vecchi et al, 2005). A significant correlation between the maximum temperature and pressure and 210 Pb concentration in air has been reported (Dueñas et al, 2005). 210 Pb concentrations at Svalbard varied between 0.011 and 0.62 mBq m À3 during 2001 and are lower than stations in the northern Finland.…”

Scavenging and fractionation of particle-reactive radioisotopes 7Be, 210Pb and 210Po in the atmosphere

“…Validation of this assumption remains a difficult task since the existing knowledge on the speciation of these radioisotopes in the atmosphere is mainly based on the aerosol samples (e.g., Marley et al, 2000;Gaffney et al, 2004;Dueñ as et al, 2005;Lozano et al, 2011). There are reports that these radioisotopes occur mainly in fine aerosols of the particle sizes ranging from 0.1 to 1 lm (e.g., Gaffney et al, 2004).…”