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Depth profiles for (A) phosphate and filterable concentrations of trace metal nutrients (B–D) (Fe, Zn, and Co) in the subarctic North Pacific Ocean (Ocean Station Papa, 50.0°N, 145.0°W, August 1987; Martin et al., 1989) and the Northeast Atlantic (40°N, 20°W, May 1989; Martin et al., 1993).
