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|234Th in surface waters: Distribution of particle export flux across the Antarctic Circumpolar Current and in the Weddell Sea during the GEOTRACES expedition ZERO and DRAKE|
Rutgers van der Loeff, M.; Cai, P.H.H.; Stimac, I.; Bracher, A.; Middag, R.; Klunder, M.B.; van Heuven, S.M.A.C. (2011). 234Th in surface waters: Distribution of particle export flux across the Antarctic Circumpolar Current and in the Weddell Sea during the GEOTRACES expedition ZERO and DRAKE. Deep-Sea Res., Part 2, Top. Stud. Oceanogr. 58(25-26): 2749-2766. dx.doi.org/10.1016/j.dsr2.2011.02.004
In: Deep-Sea Research, Part II. Topical Studies in Oceanography. Pergamon: Oxford. ISSN 0967-0645; e-ISSN 1879-0100
In a zone of very low algal abundance (54-58 degrees S at the zero meridian), confirmed by satellite Chl-a data, the lowest carbon export of the ACC was observed, allowing Fe and Mn to maintain their highest surface concentrations.
An ice-edge bloom that had developed in December/January in the zone 60-65 degrees S as studied during the previous leg had caused a high export flux at 64.5 degrees S when we visited the area 2 months later (February/March). The ice-edge bloom had then shifted south to 65-69 degrees S evident from uptake of CO2 and dissolved Fe, Mn and Th-234, without causing export yet. In this way, the parallel analysis of Th-234 can help to explain the scavenging behavior of other trace elements.
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