Journal
JOURNAL OF ENVIRONMENTAL RADIOACTIVITY
Volume 144, Issue -, Pages 140-151Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.jenvrad.2015.03.014
Keywords
CTBTO global monitoring system; Atmospheric aerosols; Beryllium-7; Wet deposition; Scavenging coefficient; Latitudinal distribution
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Data collected by the International Monitoring System (IMS) during 2009-2012 were used to study influence of precipitation and relative humidity on changes in Be-7 concentrations in atmosphere. The significant decrease in Be-7 concentrations, corresponding to measurements collected by stations located within Intertropical Convergence Zone (ITCZ) is demonstrated. This effect can be attributed to the process of enhanced wet deposition within the ITCZ. To quantify this effect data collected by IMS stations within ITCZ were thoroughly analyzed. It was found that the atmospheric content of Be-7 strongly decreases under the rain conditions. The rain mediated depletion of Be-7 to half of its before rain value, needs about 62 h in case of light precipitation, while in the case of moderate precipitation about 38 h is needed. In addition the evaluated impact of humidity showed that increase in relative humidity by 20%, for example from 70% +/- 5% to 90% +/- 5% causes almost a double decrease in beryllium concentration in surface air. (C) 2015 Elsevier Ltd. All rights reserved.
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