_:b1218194 . _:b1218194 "The marine nutricline describes a sharp change in the nutrient content of seawater (in relation to the gradients of the water mass surrounding it) in the marine water column."^^ . _:b1218194 . _:b1218194 "Wikipedia:Mixed_layer"^^ . _:b1218194 "PLB:plb"^^ . _:b1218194 .