Patricia Wheeler notes:

 1) These incubations were all run in parallel with Dick Barber's in situ
    14C measurements.
 2) The new production (nitrate uptake) estimates are based on the mean of
    duplicate incubations for each depth.
 3) Saturated ammonium uptake was measured at concentrations of about 5 uM
    and are single incubations for each depth.  These rates are "potential"
    uptake rates and need to be interpreted carefully.

 Analytical methods reported in:
 Wheeler, P.A. 1993. New production in the subarctic Pacific Ocean: Net
 changes in nitrate concentrations, rates of nitrate assimilation and
 accumulation of particulate nitrogen. Prog. Oceanogr. 32:137-161.