Influence of rainfall on atmospheric deposition fluxes of 7Be and 210Pb in Mangaluru (Mangalore) at the Southwest Coast of India

An innovative technique of harvesting soil gas as a highly efficient source of 222Rn for calibration applications in a walk-in type chamber: part-1

“…The mean values of surface exhalation rates were 39.0 ± 4.2 mBq m −2 s −1 and 130.0 ± 40.0 mBq m −2 s −1 for 222 Rn and 220 Rn respectively. These values are in agreement with the previously reported literature values for the location [31][32][33] . Also, physical properties of soil (such as 222 Rn emanation power, the porosity of the soil, moisture content etc.)…”

A global dataset of atmospheric <sup>7</sup>Be and <sup>210</sup>Pb measurements: annual air concentration and depositional flux

“…Earlier studies suggested that at continental sites V d of 7 Be will be higher than V d of 210 Pb using the ground level as the reference, which is an artifact in the manner in which the calculation is made (Turekian et al, 1983;Todd et al, 1989;McNeary and Baskaran, 2003). However, later works observed opposite results (Dueñas et al, 2005(Dueñas et al, , 2017Lozano et al, 2011;Mohan et al, 2019). The independent t test analysis indicates that at the 0.05 level the V d calculated by 7 Be and 210 Pb are not significantly different in the global dataset, which suggests that 7 Be and 210 Pb attach onto the aerosols by similar mechanisms (Winkler et al, 1998;Papastefanou, 2006) and are affected by similar deposition processes (Lozano et al, 2013).…”

“…Owing to their distinctly different source terms but wellknown source distributions and similar tropospheric physicochemical behavior, 7 Be and 210 Pb have been widely utilized as powerful atmospheric tracers for studying the origin of air masses (e.g., Graustein and Turekian, 1996;Zheng et al, 2005;Likuku et al, 2006;Dueñas et al, 2011;Lozano et al, 2012), vertical exchange and horizontal transport processes (e.g., Arimoto et al, 1999;Lee et al, 2007;Rastogi and Sarin, 2008;Tositti et al, 2014), deposition velocities and washout ratios of aerosols (e.g., Todd et al, 1989;McNeary and Baskaran, 2003;Dueñas et al, 2005;Lozano et al, 2011;Mohan et al, 2019), and the behavior and fate of analog species (e.g., Crecelius, 1981;Mattsson, 1988;Prospero et al, 1995;Lamborg et al, 2013). Following their deposition on the Earth's surface, both 7 Be and 210 Pb are strongly attached to soils, which make them useful for assessing soil erosion rates from episodic to multi-decadal timescales (e.g., Wallbrink and Murry, 1993;Blake et al, 1999;Wilson et al, 2003;Mabit et al, 2008Mabit et al, , 2014.…”

Aerosol Populations, Processes, and Ages in Bulk Deposition: Insights From a 9‐Year Study of 7Be, 210Pb, Sulfate, and Major/Trace Elements

“…Some preliminary insights can be drawn from surveys of deposition that have proliferated over recent decades (reviews in Du et al [2015], Mohan et al [2019], and F. Zhang et al [2021]). Compiled global data reveal systematic variations in 7 Be: 210 Pb depositional ratios by latitude, longitude, under different meteorological conditions, airmass sources, and changing seasons (Du et al, 2015;Dueñas et al, 2017;Huh et al, 2006; H. N. Lee et al, 2007;Lozano et al, 2011;McNeary & Baskaran, 2003;Mohan et al, 2019;Olsen et al, 1985;Renfro et al, 2013). To the first order, variations in 7 Be: 210 Pb ratios reflect vertical and lateral mixing of different airmasses and the relative strengths of 7 Be and 210 Pb sources: 7 Be activity is highest at high latitudes and high altitudes (Delaygue et al, 2015;Feely et al, 1989), 210 Pb activity is highest at continental longitudes and low altitudes (Baskaran, 2011;Preiss et al, 1996).…”