7/14 10 203040 50 40N 74W 72W 10 305070 90 0.5 135 7 135 7 Gradient Strength (au) Boundary Frequency (%) SeaWiFS Chl a (mg m -3 ) Ocean Sat Chl a (mg m.

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7/ N 74W 72W Gradient Strength (au) Boundary Frequency (%) SeaWiFS Chl a (mg m -3 ) Ocean Sat Chl a (mg m -3 )

Absorption (m -1 ) Attenuation (m -1 )

A) Salinity B) CDOM C) Phytoplankton D) CDOM slope CDOM absorption (m -1 ) CDOM slope (nm -1 ) Phytoplankton absorption (m -1 ) Salinity

Cell Division unitless

A) B) C) D)

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