N biomass and N uptake by heterotrophic bacteria and phytoplankton were examined during the North Atlantic spring blooom (May 18-31, 1989) abaord the R/V Atlantis II in the vicinity of 47 N, 20 W . The ship followed drifting sediment trap arrays and samples were usually obtained in the morning from CTD/30 litre Niskin rosette casts.
For a complete description of methodology, please refer to:
Kirchman, DL, HW Ducklow, JJ McCarthy and C Garside, 1994. Biomass and nitrogen uptake by heterotrophic bacteria during the spring phytoplankton bloom in the North Atlantic Ocean. Deep-Sea Research I, Vol.41. No.5/6, pp.879-895