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Fig. 31. Estimated uptake rates of silicic acid and nitrate integrated within the surface mixed layer (a) and the ratio of these estimated uptake rates (b) during SEEDS. The following assumptions were made for the estimation of these nutrients' uptake rate: (i) nitrate uptake rate is in proportion to the photosynthetic rate at a 106C:16N ratio; (ii) [Si(OH)4]:[NO3] uptake ratio in the surface water is 1.5; and (iii) silicic acid uptake by diatoms takes place within the whole surface mixed layer at a rate that is undiminished from that in the surface. The photosynthetic rates measured at 6 light depths (100, 35, 25, 10, 6, and 1% of the surface irradiance) during SEEDS were obtained from Kudo et al. (2005). The [Si(OH)4]:[NO3] drawdown ratio (1.5) observed during the early phase of the SEEDS bloom was used for estimating the uptake rate of silicic acid from that of nitrate in the surface water.

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