FN Archimer Export Format
PT J
TI Distributions of total and size-fractionated particulate 210Po and 210Pb activities along the North Atlantic GEOTRACES GA01 transect: GEOVIDE cruise
BT 
AF Tang, Yi
   Castrillejo, Maxi
   Roca-Martí, Montserrat
   Masqué, Pere
   Lemaitre, Nolwenn
   Stewart, Gillian
AS 1:1,2;2:3,4;3:3;4:3,5;5:6;6:1,2;
FF 1:;2:;3:;4:;5:;6:;
C1 Earth and Environmental Sciences, the Graduate Center, City University of New York, New York, USA
   School of Earth and Environmental Sciences, Queens College, City University of New York, Flushing, USA
   Institut de Ciència i Tecnologia Ambientals & Departament de Física, Universitat Autònoma de Barcelona, Bellaterra, 08193, Spain
   Laboratory of Ion Beam Physics, ETH Zurich, Otto-Stern-Weg 5, Zürich, 8093, Switzerland
   School of Science and Centre for Marine Ecosystems Research, Edith Cowan University, Joondalup, Western Australia, Australia
   Department of Earth Sciences, Institute of Geochemistry and Petrology, ETH Zurich, Zürich, Switzerland
C2 CITY UNIV NEW YORK, USA
   CITY UNIV NEW YORK, USA
   UNIV AUTONOMA BARCELONA, SPAIN
   ETH ZURICH, SWITZERLAND
   UNIV EDITH COWAN, AUSTRALIA
   ETH ZURICH, SWITZERLAND
IF 3.951
TC 11
UR https://archimer.ifremer.fr/doc/00485/59671/62736.pdf
   https://archimer.ifremer.fr/doc/00485/59671/62737.pdf
   https://archimer.ifremer.fr/doc/00485/59671/62739.xlsx
   https://archimer.ifremer.fr/doc/00485/59671/62740.pdf
   https://archimer.ifremer.fr/doc/00485/59671/62741.pdf
LA English
DT Article
CR GEOVIDE
BO Pourquoi pas ?
AB Vertical distributions of total and particulate polonium-210 (210Po) and lead-210 (210Pb) activities in the water column were measured at 11 stations in the North Atlantic during the GEOTRACES 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 in the mesopelagic (100–1000 m). The partitioning coefficients (Kd) along the transect suggest the preferential association of 210Po relative to 210Pb onto particles. The prominent role of small particles in sorption was confirmed by the observation that over 80 % of the particulate radionuclide activity was on small particles. To account for the observed surface water 210Po ∕ 210Pb disequilibria, particulate radionuclide activities and export of both small (1–53 µm) and large (>53 µm) particles must be considered. A comparison between the GEOVIDE total particulate 210Po ∕ 210Pb activity ratios (ARs) and the ratios in previous studies revealed a distinct geographic distribution, with lower particulate ARs in the high-latitude North Atlantic (including this study) and Arctic in relation to all other samples. For the samples where apparent oxygen utilization (AOU) was calculated 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 of remineralization and radionuclide decay from particles as they age. 
PY 2018
PD SEP
SO Biogeosciences
SN 1726-4170
PU Copernicus GmbH
VL 15
IS 17
UT 000444619000001
BP 5437
EP 5453
DI 10.5194/bg-15-5437-2018
ID 59671
ER

EF