Distribution of beryllium-7 ( 7 Be) in the Black Sea in the summer of 2016

Abstract

The spatial distribution of ⁷Be activity in the surface layer of the Black Sea was studied using the data of field observations made during the 87th cruise of R/V Professor Vodyanitskii. Activity of ⁷Be varied spatially from 4.6 to 9.5 Bq m⁻³ (mean 7.5 ± 1.3 Bq m⁻³) where about 9% was found on suspended matter. The minimum values of activity were typical for samples taken in the shelf waters and the maximum—offshore. The influence of different factors on ⁷Be activity was analyzed. It was revealed that variation of both ⁷Be wet deposition on the sea surface and concentration of suspended matter were the most significant for spatiotemporal variability of ⁷Be activity in seawater during the study period. The estimates of ⁷Be distribution coefficient between dissolved and particulate forms were obtained. This coefficient varied from 1.5·10⁵ to 2.4·10⁵ L kg⁻¹, averaged (1.9 ± 0.3)·10⁵ L kg⁻¹.

https://ift.tt/2NyQFju