Samples from 2 l of sea water were filtered through polycarbonate Millipore. The filters were kept deep frozen and analyzed according to Holm-Hansen et al. (Holm-Hansen, O., Lorenzen, C.J., Holmes, R.
Photosynthetic productivity was measured according to the in situ 14C method. Fractionation was carried out by filtration through polycarbonate Millipore filters having porosities 0.2 (total stock), 1
Filter size-fractionated (>0.2-3 μm) particulate 14C-based rates of primary production were measured at six discrete depths (5, 25, 45, 75, 100, and 125 m) throughout the euphotic zone. Seawater sa
