RRS Charles Darwin CD5

Cruise summary report

Cruise Info. 
Ship name (ship code)RRS Charles Darwin (74AB)
Cruise identifierCD5
Cruise period1985-07-23 — 1985-08-02
Port of departureFalmouth, United Kingdom
Port of returnFalmouth, United Kingdom
ObjectivesTo investigate the biogeochemical cycling of Nitrogen in contrasting ocean waters along a SW section of the UK Continental Shelf.
To test the deployment, behaviour, structural integrity and recovery of an experimental mesocosm bag (MB) intended for capture of the microbial ecosystem and tracking the passage of N in the microbial loop.
To characterise the SW shelf section in terms of nutrient distribution, pigments, N cycling microbes. To measure fine scale vertical distribution of above parameters at thermocline region of CS-2.
To measure rates of size-fractionated assimilation and regeneration of N species in euphotic, thermocline and deep waters.
To measure the distribution, production and degradation of photosynthetic pigments in various size fractions using HPLC.
To measure the impact of microzooplankton grazing on bacterial and phytoplankton populations and its effect on N cycling.
To obtain shelf section of dissolved trace metals (Al, Mn, Cu, Cd, Ni, Zn, Pb) distribution and their biogeochemical associations with Nitrogen cycling.
Chief scientistR Fauzi C Mantoura (Institute of Marine Environmental Research, Plymouth)
ProjectMICRON 5
Cruise reportRRS Charles Darwin CD5 cruise report cd5.pdf (0.28 MB) 
Ocean/sea areas 
GeneralBristol Channel
Celtic Sea
SpecificWestern Approaches to the English and Bristol Channels
Track chartsRRS Charles Darwin CD5 cruise track — trk3101.html
Physical oceanography 
Water bottle stationsQuantity: number of stations = 2
Description: S surface only
CTD stationsQuantity: number of stations = 8
Chemical oceanography 
OxygenQuantity: number of stations = 8
PhosphateQuantity: number of stations = 8
NitrateQuantity: number of stations = 8
NitriteQuantity: number of stations = 8
SilicateQuantity: number of stations = 8
Trace elementsQuantity: number of stations = 8
Trace metalsQuantity: number of stations = 8
Biology and fisheries 
Primary productivityQuantity: number of stations = 3
Phytoplankton pigs (eg chlorophyll, fluorescence)Quantity: number of stations = 8
Particulate organic matter (inc POC, PON)Quantity: number of stations = 8
PhytoplanktonQuantity: number of stations = 3
ZooplanktonQuantity: number of stations = 3
SestonQuantity: number of stations = 8
Pelagic bacteria/micro-organismsQuantity: number of stations = 3