Deposition patterns of atmospheric ⁷Be and ²¹⁰Pb in coast of East China Sea, Shanghai, China

In complied data of atmospheric deposition of ²¹⁰Pb and ⁷Be in the world, the data from China is of lack. In the present paper, atmospheric depositional fluxes of ⁷Be and ²¹⁰Pb were simultaneously measured in semimonthly interval for 1 year (from November 2005 to October 2006) at Shanghai (31°13′39″N, 121°23′56″E), China, 50 km from the coastal of East China Sea. The annual average flux of ²¹⁰Pb and ⁷Be in 2006 is 4.79×10² and 2.07×10³ Bq m^-2 year^-1, respectively. Compared with the published data, the highest flux of ²¹⁰Pb in 2006 at Shanghai was clearly observed during studying periods. The possible reason for such high flux of ²¹⁰Pb is discussed. Furthermore, deposition fluxes of both ²¹⁰Pb and ⁷Be show varieties in seasons: highest flux of ²¹⁰Pb in winter (November-August) and that of ⁷Be in spring (March-May). Moreover, the correlation between activity fluxes and precipitation are weak both for ⁷Be and ²¹⁰Pb in whole of 2006; however, the high correlation are observed in autumn and spring for ⁷Be and that only in autumn for ²¹⁰Pb.