FN Archimer Export Format PT J TI Inventory and distribution of tritium in the oceans in 2016 BT AF OMS, Pierre-Emmanuel BAILLY DU BOIS, Pascal DUMAS, Franck LAZURE, Pascal MORILLON, Mehdi VOISEUX, Claire LE CORRE, Cedric COSSONNET, Catherine SOLIER, Luc MORIN, Pascal AS 1:1,2;2:1;3:3;4:2;5:1;6:1;7:4;8:4;9:1;10:5; FF 1:;2:;3:;4:PDG-ODE-LOPS-OC;5:;6:;7:;8:;9:;10:PDG-DFO; C1 Inst Radioprotect & Surete Nucl, Lab Radioecol Cherbourg Octeville, IRSN PSE ENV SRTE LRC, Rue Max Pol Fouchet,BP 10, F-50130 Octeville, France. Inst Francais Rech Exploitat Mer, Lab Ocean Cotier, IFREMER PDG ODE LOPS OC, Ctr Bretagne ZI Pointe Diable, F-29280 Plouzane, France. Serv Hydrograph & Oceanog Maine, SHOM DOPS HOM REC, 13 Rue Chatellier, F-29200 Brest, France. Inst Radioprotect & Surete Nucl, Lab Metrol Radioact Environm, IRSN PSE ENV SAME LMRE, Bois Rames Batiment 501, F-91400 Orsay, France. Inst Francais Rech Exploitat Mer, Lab Ocean Cotier, IFREMER PDG DFO, Ctr Bretagne ZI Pointe Diable, F-29280 Plouzane, France. C2 IRSN, FRANCE IFREMER, FRANCE SHOM, FRANCE IRSN, FRANCE IFREMER, FRANCE SI BREST SE PDG-ODE-LOPS-OC PDG-DFO UM LOPS IN WOS Ifremer UPR WOS Ifremer UMR copubli-france IF 6.551 TC 18 UR https://archimer.ifremer.fr/doc/00470/58157/60653.pdf LA English DT Article CR ARCANE 2 ASPEX1 ASPEX3 ASPEX4 ATMARA DYNSEDIM 2016 IRMA OVIDE 1 PELGAS 2016 PLUME BO Thalassa Le Suroît L'Atalante Cote D'Aquitaine Côtes De La Manche DE ;Radionuclide;Tracer;Database;Background concentration AB Tritium concentrations in oceans were compiled from the literature, online databases and original measurements in order to determine the global distribution of tritium concentrations according to latitude and depth in all oceans. The total inventory of tritium decay corrected in 2016 has been estimated using evaluation of the natural and artificial contributions in 23 spatial subdivisions of the total ocean. It is determined equal to 26.8 ± 14 kg including 3.8 kg of cosmogenic tritium. That is in agreement with the total atmospheric input of tritium from nuclear bomb tests and the natural inventory at steady-state estimated from natural production rates in the literature (27.8–29.3 kg in the Earth). We confirm the global increase in tritium according to latitude observed in the Northern hemisphere since 1967 with a maximum in the Arctic Ocean. The minimum tritium concentrations observed in the Southern Ocean were close to steady-state with known natural tritium deposition. We focused on the temporal evolution of surface (0 to 500 m) tritium concentrations in a selected area of the North Atlantic Ocean (30°N–60°N) where we found the 2016 concentration to be 0.60 ± 0.10 TU (1σ). Results showed that in that area, between 1988 and 2013, tritium concentrations: i) decreased faster than the sole radioactive decay, due to a mixing with lower and lateral less concentrated waters, and ii) decreased towards an apparent steady state concentration. The half-time mixing rate of surface waters and the steady state concentration were respectively calculated to be 23 ± 5 years (1σ) and 0.38 ± 0.07 TU (1σ). This apparent steady-state concentration in the North Atlantic Ocean implies a mean tritium deposition of 1870 ± 345 Bq·m−2 (1σ), five folds higher than the known inputs (natural, nuclear tests fallout and industrial releases, ~367 Bq·m−2) in this area. PY 2019 PD MAR SO Science Of The Total Environment SN 0048-9697 PU Elsevier Science Bv VL 656 UT 000455039600123 BP 1289 EP 1303 DI 10.1016/j.scitotenv.2018.11.448 ID 58157 ER EF