2025-08-12 RADIOCARBON 2025 null(卷), null(期), (null页)
Cosmogenic Be-7 and Be-10 are effective tracers for studying atmospheric dynamics and Earth's surface processes, with over 90% of these isotopes reaching the surface via wet deposition. However, the characteristics and influencing factors of Be-7 and Be-10 wet deposition remain unclear in different regions, limiting the precision of these nuclides as tracers of environmental change. This study analyzes the annual variation of Be-7 and Be-10 wet deposition in Xi'an and examines the impact of precipitation on their deposition. Ultra-trace levels of Be-7 and Be-10 in precipitation were synchronously measured using state-of-the-art accelerator mass spectrometry. One-year (July 30, 2020 to September 3, 2021), high-frequency (individual rain events) and time-synchronized series of observations of Be-7 and Be-10 wet deposition data (n = 49) were analyzed. The total annual wet deposition fluxes of Be-7 and Be-10 in central China (34.22 degrees N, 109.01 degrees E) for 2020/21 were (218 +/- 24) x 10(8) atoms