Resumen:
10-years records of monthly bulk atmospheric fluxes of Be-7 and Pb-210 (wet + dry, n = 119 samples) at a coastal station in Cienfuegos (Cuba) between 2010 and 2019 were reported and assessed in function of their temporal variability and meteorological influence. Fluxes of Be-7 and Pb-210 ranged from 120 to 15617 and from 29 to 911 mBq m(- 2) day(-1), respectively. Both radionuclides exhibited a similar seasonal trend with highest values during wet months and minimum values during dry months. The removal of Be-7 and Pb-210 from the atmosphere was mainly controlled by wet depositions, while dry deposition was estimated to be more important for Pb-210 (29% of the total bulk deposition) than for Be-7 (12%). The Pb-210/Be-7 ratios (average of 0.10) showed low variability during wet months with abrupt peaks in the driest months with low temperatures and the highest wind speed and pressure, which was mainly attributed to contributions from soil resuspension. The calculated total deposition velocity of aerosols derived from Be-7 (average of 0.48 cm s(- 1)) and Pb-210 (average of 0.47 cm s(- 1)) was in agreement with values reported in the literature. Multiple linear regression models for the monthly fluxes of Be-7 and Pb-210 based on precipitation, temperature and pressure and explaining about 60% of their variances were derived, highlighting the preponderant role of the local and regional conditions on the variability of these radionuclides. The annual fluxes of Be-7 (209-1901 Bq m(- 2) y(-1)) and Pb-210 (35-123 Bq m(- 2) y(-1)) were in the range of variations observed in other coastal stations worldwide, showing fluctuations affected by changes in the amount of precipitation during the wet periods. Be-7 annual variability also evidenced a significant modulation with the solar activity.
