Gradients 4 (TN397) Cruise Size Fractionated Primary Productivity Data (2021)

These Simons Collaboration on Ocean Processes and Ecology (SCOPE) data products were produced by the University of Hawaiʻi at Mānoa with support from the Simons Foundation. Size fractionated 14C-PP were incubated for 24 hours in 500 mL bottles and subsequently filtered onto glass fiber filters (100 mL) with the filtrate sequentially filtered through a >10 µm (400 mL), 2 mm (400 mL), and 0.2 mm (100 mL) polycarbonate membrane filters. Samples were processed as in Karl et al. (2021) to generate 14C-PP in the 0.2–2 µm, 2-10 µm, and >10 µm size fractions. Community 14C-PP measurements were obtained by filtering bulk seawater onto 25 mm Whatman glass fiber filters (GF/F; 0.7 µm pore size) (Karl et al. 1996), and rates were derived from 24-hour incubations.