For POP, aluminium and manganese, distinct temporal trends were also observed. For example,
Aclacinomycin A increase of POP concentration at 30 m was also observed as the bloom developed; POP concentrations increased from 43 nmol L− 1 on day 265 to 78 nmol L− 1 on day 268 and 62 nmol L− 1 on day 269 (Fig. 7 and Table 4). Like particulate iron, the inventory for POP decreased from 3.27 mmol m− 2 on day 265 to 1.95 mmol m− 2 on day 268 and 1.55 mmol m− 2 on day 269 μmol m− 2. This decline was consistent with the increased export of particulate phosphate from the mixed layer. Particulate organic phosphorus concentrations were also higher at 100 m on day 268, and at 100 m and 200 m on day 269 (Fig. 8 and Fig. 9). Unlike iron, and the other two trace metals, only 63% of POP in the mixed layer phytoplankton community resided within the > 20 μm size fraction (Fig. 9). This indicates that POP was more evenly distributed between the two size classes, indicating that the iron requirement of the > 20 μm size fraction was higher than the smaller size class compared to that of phosphorus. In other words, the large > 20 μm
cells had higher Fe
razz ratios than the small ones (2–20 μm) (Fig.
cool .
