Radionuclides measured on 21 water bottle profiles during POLARSTERN cruise ANT-XXIV/3 ...

• Main Authors: Venchiarutti, Célia, Rutgers van der Loeff, Michiel M, Stimac, Ingrid
• Format: Article in Journal/Newspaper
• Language: English
• Published: PANGAEA 2010
• Subjects: CTD/Rosette, ultra clean; CTD/Rosette; Multiple investigations; ANT-XXIV/3; Polarstern; Global marine biogeochemical cycles of trace elements and their isotopes GEOTRACES; Marine Geochemistry @ AWI AWI_MarGeoChem; Priority Programme 1158 Antarctic Research with Comparable Investigations in Arctic Sea Ice Areas SPP1158; Antarctic; Arctic; Drake Passage; Antarc*; Sea ice
• Online Access: https://dx.doi.org/10.1594/pangaea.746773; https://doi.pangaea.de/10.1594/PANGAEA.746773

Drake Passage is a major route for many water masses from the strong Antarctic Circumpolar Current. During the ANTXXIV-3 expedition (in 2008) the vertical distributions of dissolved and size-fractionated particulate 231Pa and thorium isotopes (230Th, 232Th and 234Th) were investigated in order to better define the scavenging regimes and the effects of the oceanic circulation on the fate of particulate material and on the Pa-Th distributions in the water column. The reversible scavenging-model applied to both 230Th and 234Th, in the upper 1500 m depth, gives estimates of the particle dynamics (settling velocities S~ 500-1300 m/y, adsorption and desorption rate constants of 0.1-0.4 1/y and 1-6 1/y respectively). Particulate 234Th/230Th activity ratio shows a depth dependence, with decreasing ratio with increasing depth in agreement with previous studies, but no relationship with particle size was found. 231Pa and thorium isotope fractionation and partition coefficients were investigated with particle size vs ... : Supplement to: Venchiarutti, Célia; Rutgers van der Loeff, Michiel M; Stimac, Ingrid (2011): Scavenging of 231Pa and thorium isotopes based on dissolved and size-fractionated particulate distributions at Drake Passage (ANTXXIV-3). Deep Sea Research Part II: Topical Studies in Oceanography, 58(25-26), 2767-2784 ...