Different diffusivities for different marine tracers?
kzoo>kphy
Zooplankton have greater swimming speeds than
phytoplankton.
Levin and Segel, 1976; Matthews and Brindley, 1997
kphy>knit
Different vertical profiles for nitrate and phytoplankton
in the presence of shear.
Okubo, 1974, 1978