Atmospheric deposition of ⁷Be, ²¹⁰Pb in Xining, a typical city on the Qinghai-Tibet Plateau, China

First continuous observations of ⁷Be and ²¹⁰Pb monthly total depositional fluxes were performed from December 2014 to November 2017 in Xining, a typical city on the Qinghai-Tibet Plateau, China. The depositional fluxes showed a clear seasonal variation, with peak depositional fluxes in summer for ⁷Be and in summer or fall for ²¹⁰Pb, and minimum values in winter for both ⁷Be and ²¹⁰Pb. These are ascribed to the seasonal variability in precipitation and the stratosphere-troposphere exchange of atmosphere. The annual depositional fluxes were 1555 Bq m⁻² year⁻¹ for ⁷Be and 284 Bq m⁻² year⁻¹ for ²¹⁰Pb. The annual volume-weighted activities and depositional fluxes of ⁷Be increased with altitude.