RRS Frederick Russell FR22/83 (C/4/83)
Cruise summary report
|Ship name (ship code)||RRS Frederick Russell (74GG)|
|Cruise identifier||FR22/83 (C/4/83)|
|Cruise period||1983-12-07 — 1983-12-13|
|Port of departure||Plymouth, United Kingdom|
|Port of return||Falmouth, United Kingdom|
|Objectives||1) To determine the presence or absence of a diapause condition in the two congeneric species of copepod (Calanus helgolandicus and C. finmarchicus) from the shelf area and open ocean during winter.
(a) To compare the vertical distribution and stage composition of the overwintering Calanus spp. in the shallow shelf-sea (100m) with those in the deep water (2000m) at the shelf-edge.
(b) To collect live material to determine whether or not the Calanus from the shelf are in a different chemical and physiological state from those of the deep ocean.
(c) To obtain living material for length (dry weight, gut content, carbon, nitrogen, ash, lipid and protein contents).
(d) To measure the assimilation rate and absorption efficiency by Calanus using radioactive tracer and gut enzyme analysis techniques.
2a) To measure in situ and on deck primary production and to partition production into different size classes of phytoplankton.
(b) To measure the abundance and vertical distribution of phytoplankton, bacteria and flagellates.
(c) To measure bacterial production throughout the water column.
3) To investigate size-related re-mineralization of NH4+ in relation to measurements of trace concentrations of NH4+.
4a) To investigate the variations in the natural abundance of 15N in suspended particulate matter at CS2 and CS4 sites.
(b) To investigate the variation in the natural abundance of 15N in operationally defined trophic levels.
5) To investigate the biotic conditions (chlorophyll, particulate carbon, organic matter particle size) and hydrography at each of the stations.
|Chief scientist||Bob Williams (Institute of Marine Environmental Research, Plymouth)|
|Cruise report||(0.16 MB)|
North East Atlantic Ocean (limit 40W)
|Specific||Celtic Sea and beyond|
|Phosphate||Quantity: number of profiles = 4|
|Total - P||Quantity: number of profiles = 4|
|Nitrate||Quantity: number of profiles = 4|
|Nitrite||Quantity: number of profiles = 4|
|Silicate||Quantity: number of profiles = 4|
|Other chemical oceanographic measurements||Quantity: number of profiles = 4|
|Biology and fisheries|
|Primary productivity||Quantity: number of experiments = 2|
|Phytoplankton pigs (eg chlorophyll, fluorescence)||Quantity: number of profiles = 7|
|Phytoplankton||Quantity: number of profiles = 2|
|Zooplankton||Quantity: number of samples = 97|
Description: Collected from three successful LHPR hauls and one RMT haul. Samples frozen, preserved in formalin, dried for chemical analysis or used in excretion experiments.
|Seston||Quantity: number of profiles = 7|
|Pelagic bacteria/micro-organisms||Quantity: number of profiles = 2|
|Other biological/fisheries measurement||Quantity: number of measurements = 4|
|Data held at BODC|
|9 General station with STD/bottles/additional instruments||Salinity of the water column|
Temperature of the water column