Bottom depth permitting, the nets were towed obliquely from 210 m to the surface. The tow time for a standard tow was 21.5 minutes. Volumes filtered were determined from flowmeter readings and the mouth area of the net. Only one sample of each pair was retained and preserved. The origin of the samples is indicated by the cruise, station, depth and cast time in PST, and the local times of each analysis.
Analytical bias is indicated by the degree to which D differs from zero.
Precision is indicated by the standard deviation. The reproducibility of chlorophyll and phaeophytin is a function of the mean concentration. Weather conditions have been coded using WMO code 4501. Observed and interpolated standard depth data from hydrographic casts have been interspersed and are presented together sequentially by depth. The uptake values shown are the total for the incubation period.