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Optical ratios inside (blue dots) and outside (green dots) coccolithophore blooms sampled by floats 6901583 and 6902738. The dashed lines are the b bp/c p and b bp/[Chl‐a] thresholds 0.011 and 0.007 m2 mg−1, respectively, that best discriminate coccolithophore blooms from non‐bloom cases.
