RRS Frederick Russell FR22/83 (C/4/83)

Cruise summary report

Cruise Info. 
Ship name (ship code)RRS Frederick Russell (74GG)
Cruise identifierFR22/83 (C/4/83)
Cruise period1983-12-07 — 1983-12-13
Port of departurePlymouth, United Kingdom
Port of returnFalmouth, United Kingdom
Objectives1) 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 scientistBob Williams (Institute of Marine Environmental Research, Plymouth)
Cruise reportRRS Frederick Russell FR22/83 (C/4/83) cruise report frederick_russell22_83.pdf (0.16 MB) 
Ocean/sea areas 
GeneralEnglish Channel
Celtic Sea
North East Atlantic Ocean (limit 40W)
SpecificCeltic Sea and beyond
Track chartsRRS Frederick Russell FR22/83 (C/4/83) cruise track — trk2931.html
Chemical oceanography 
PhosphateQuantity: number of profiles = 4
Total - PQuantity: number of profiles = 4
NitrateQuantity: number of profiles = 4
NitriteQuantity: number of profiles = 4
SilicateQuantity: number of profiles = 4
Other chemical oceanographic measurementsQuantity: number of profiles = 4
Biology and fisheries 
Primary productivityQuantity: number of experiments = 2
Phytoplankton pigs (eg chlorophyll, fluorescence)Quantity: number of profiles = 7
PhytoplanktonQuantity: number of profiles = 2
ZooplanktonQuantity: 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.
SestonQuantity: number of profiles = 7
Pelagic bacteria/micro-organismsQuantity: number of profiles = 2
Other biological/fisheries measurementQuantity: number of measurements = 4
Data held at BODC 
Discrete samples 
9  General station with STD/bottles/additional instrumentsSalinity of the water column
Temperature of the water column