(Table 1) Cadmium and nutrient concentration of surface waters sampled during POLARSTERN cruise ANT-XXIV/III


The High Nutrient Low Chlorophyll (HNLC) Southern Ocean plays a key role in regulating the biological pump and the global carbon cycle. Here we examine the efficacy of stable cadmium (Cd) isotope fractionation for detecting differences in biological productivity between regions. Our results show strong meridional Cd isotope and concentration gradients modulated by the Antarctic Fronts, with a clear biogeochemical divide located near 56°S. The coincidence of the Cd isotope divide with the Southern Boundary of the Antarctic Circumpolar Current (ACC),together with evidence for northward advection of the Cd signal in the ACC, demonstrate that Cd isotopes trace surface ocean circulation regimes. The relationships between Cd isotope ratios and concentrations display two negative correlations, separating the ACC and Weddell Gyre into two distinct Cd isoscapes. These arrays are consistent with Rayleigh fractionation and imply a doubling of the isotope effect due to biological consumption of Cd during water transport from the Weddell Gyre into the ACC. The increase in magnitude of Cd isotope fractionation can be accounted for by differences in the phytoplankton biomass, community composition, and their physiological uptake mechanisms in the Weddell Gyre and ACC, thus linking Cd isotope fractionation to primary production and the global carbon cycle.

Data extracted in the frame of a joint ICSTI/PANGAEA IPY effort, see http://doi.pangaea.de/10.1594/PANGAEA.150150

Supplement to: Abouchami, Wafa; Galer, Stephen J G; de Baar, Hein J W; Alderkamp, Anne-Carlijn; Middag, Rob; Laan, Patrick; Feldmann, H; Andreae, Meinrat O (2011): Modulation of the Southern Ocean cadmium isotope signature by ocean circulation and primary productivity. Earth and Planetary Science Letters, 305(1-2), 83-91

DOI https://doi.org/10.1594/PANGAEA.805890
Related Identifier IsSupplementTo https://doi.org/10.1016/j.epsl.2011.02.044
Metadata Access https://ws.pangaea.de/oai/provider?verb=GetRecord&metadataPrefix=datacite4&identifier=oai:pangaea.de:doi:10.1594/PANGAEA.805890
Creator Abouchami, Wafa; Galer, Stephen J G; de Baar, Hein J W; Alderkamp, Anne-Carlijn; Middag, Rob (ORCID: 0000-0002-3326-530X); Laan, Patrick; Feldmann, H; Andreae, Meinrat O ORCID logo
Publisher PANGAEA
Publication Year 2011
Rights Creative Commons Attribution 3.0 Unported; https://creativecommons.org/licenses/by/3.0/
OpenAccess true
Resource Type Supplementary Dataset; Dataset
Format text/tab-separated-values
Size 412 data points
Discipline Earth System Research
Spatial Coverage (-1.399W, -67.001S, 8.993E, -42.339N); South Atlantic Ocean; Weddell Sea
Temporal Coverage Begin 2008-02-13T17:17:00Z
Temporal Coverage End 2008-03-09T15:25:00Z