Table 1. Annual Average Global Budgets of 210Pb and 7Be in the Troposphere+Stratosphere for 2013 210Pb 7Be Burden, g 271.835 20.2551 Sources, g d-1 32.1967 0.403346 stratosphere 0.130619 0.270660 troposphere 32.0661 0.132687 Sinks, g d-1 32.2894 0.403731 dry deposition 3.93661 0.0103364 wet deposition stratiform 19.8931 0.103796 convective 8.43679 0.0260605 radioactive decay 0.0228691 0.263539 Accumulation Term Initial mass, g 239.088 20.4548 Final mass, g 238.075 20.4544 Difference, g -1.01302 -0.000404358