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. Vertical distributions of total and particulate polonium-210( 210Po ) and lead-210 ( 210Pb ) activities in the watercolumn were measured at 11 stations in the North Atlantic during theGEOTRACES GA01 transect: GEOVIDE cruise in May–June 2014.Total 210Po activity was on average 24 % lower than 210Pb activity in the upper 100 m, and it was closer to unity inthe mesopelagic (100–1000 m). The partitioning coefficients( Kd ) along the transect suggest the preferential association of 210Po relative to 210Pb onto particles. The prominentrole of small particles in sorption was confirmed by the observation thatover 80 % of the particulate radionuclide activity was on smallparticles. To account for the observed surface water 210Po ∕ 210Pb disequilibria, particulate radionuclideactivities and export of both small (1–53  µ m) and large ( >53 µ m) particles must be considered. A comparison between theGEOVIDE total particulate 210Po ∕ 210Pb activityratios (ARs) and the ratios in previous studies revealed a distinctgeographic distribution, with lower particulate ARs in the high-latitudeNorth Atlantic (including this study) and Arctic in relation to all othersamples. For the samples where apparent oxygen utilization (AOU) wascalculated at the same depth and time as the 210Po ∕ 210Pb AR (40 stations including this study),there was a two-phase correlation between the total particulate AR and AOU,likely reflecting the nature of the particles and demonstrating the forces ofremineralization and radionuclide decay from particles as they age.

biogeosciences

Distributions of total and size-fractionated particulate &amp;lt;sup&amp;gt;210&amp;lt;/sup&amp;gt;Po and &amp;lt;sup&amp;gt;210&amp;lt;/sup&amp;gt;Pb activities along the North Atlantic GEOTRACES GA01 transect: GEOVIDE cruise