European 222Rn inventory for applied atmospheric studies

The radioactive noble gas Rn-222, naturally emitted from land surfaces, is widely used as a tracer in characterising atmospheric transport and mixing processes. A constant and homogenous Rn-222 source of 1 atom cm(-2) s(-1) is generally assumed, sometimes less in northern latitudes. It is well known that Rn-222 flux varies in space and time but a robust description of it on a continental scale has not been possible before. Here, we present for the first time a spatially and temporally resolved Rn-222 source map for the European Continent (European Union. Norway. former Yugoslavia and Switzerland). It is based on the correlation between the Rn-222 flux and terrestrial gamma-dose rate. Total gamma-dose rate is monitored in this area at nearly 3600 stations continuously and the terrestrial component can be extracted from these measurements. On a resulting 0.5 degrees x 0.5 degrees map, mean annual values of Rn-222 flux ranged from 0.03 to 1.76 atom cm(-2) s(-1), half of the values being between 0.40 and 0.70 atom cm(-2) s(-1). The source strength was patchy but exhibited a decreasing trend with increasing latitude. Large values were mainly found on the Iberian Peninsula, small values along coasts and in northern and eastern parts of Europe. The seasonal amplitude in Rn-222 flux south of 55 degrees N was small in 2006 with weekly averages deviating less than +/- 15% from the annual mean. Between 65 degrees N and 70 degrees N, weekly means are 2.5 times larger in summer than in winter. (C) 2008 Elsevier Ltd. All rights reserved.