Thorium isotopes in the Southeast Atlantic Ocean: Tracking scavenging during water mass mixing along neutral density surfaces

Matthieu Roy-Barman (1, 2) , François Thil (1, 3) , Louise Bordier (1, 2) , Arnaud Dapoigny (1, 3) , Lorna Foliot (1, 3) , Sophie Ayrault (1, 2) , François Lacan (4) , Catherine Jeandel (4) , Catherine Pradoux (4) , Ester Garcia-Solsona

1 LSCE - Laboratoire des Sciences du Climat et de l'Environnement [Gif-sur-Yvette]
2 GEDI - Géochimie Des Impacts
3 GEOTRAC - Géochrononologie Traceurs Archéométrie
4 LEGOS - Laboratoire d'études en Géophysique et océanographie spatiales

The distributions of dissolved and particulate thorium isotopes (230 Th and 232 Th) were established in samples from the BONUS GoodHope (BGH) IPY-GEOTRACES cruise in the SE Atlantic sector of the Southern Ocean (36°S-13°E to 57°S-0°, Feb.-Mar. 2008). The distribution of total (dissolved+particulate) 232 Th is dominated by the inputs from continental margins. The non-linear profiles of dissolved 230 Th are interpreted as due to the southward upwelling of the isopycnal surfaces. However, total 230 Th and 232 Th versus salinity plots illustrate departures from binary mixing and provides evidence for non-conservative behavior of both isotopes along the section. We propose a model for total 230 Th and 232 Th scavenging and mixing along isopycnal surfaces. We use this model to estimate particle settling speeds and isopycnal eddy diffusion coefficients along the BGH section. Data-model comparison suggests particle settling velocities in the range of 400-700 m/y and isopycnal eddy diffusivity of the order of 2000 m 2 /s.

Mots clés: thorium isotopes; Southern Ocean; Atlantic; marine particles; isopycnal mixing

Mots clés: PANOPLY

Domaines: Océan, Atmosphère; Géochimie

Matthieu Roy-Barman, François Thil, Louise Bordier, Arnaud Dapoigny, Lorna Foliot, et al.. Thorium isotopes in the Southeast Atlantic Ocean: Tracking scavenging during water mass mixing along neutral density surfaces. Deep Sea Research Part I: Oceanographic Research Papers, 2019, 149, pp.103042. ⟨10.1016/j.dsr.2019.05.002⟩. ⟨hal-02410096⟩