We describe the use of the 14 C-AMS technique to study the influence of upwelling waters to the local biological production, at Arraial do Cabo, Brazil. Results on ∆ 14 C from seaweed tissues incubated into three different types of water mass show the association of primary production with the upwelling waters. We also discuss the importance of high-precision 14 C -AMS measurements for this kind of study, and the properly application of isotopic fractionation corrections on radiocarbon results.
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