Cruise inventory

RRS Discovery D261

Cruise summary report

Cruise Info. 
Ship name (ship code)RRS Discovery (74E3)
Cruise identifierD261
Cruise period2002-04-01 — 2002-04-14
StatusCompleted
Port of departureSouthampton, United Kingdom
Port of returnSouthampton, United Kingdom
PurposeResearch
ObjectivesThe cruise focused on changes in the microbial community structure, dynamics and processes in key biogeomes from the English Channel to the area off the shelf break in the North East Atlantic. The cruise was part of the five year (2001 - 2006) NERC PML Core Strategic Research Project on Microbially Driven Biogeochemistry (MDB).
The cruise focused on the following aims (from MDB):
How does the composition of the autotrophic and heterotrophic community affect carbon cycling and ecosystem stability?
How does nutrient supply influence carbon flux and trace gas production?
What factors determine the air-sea flux of climate-active gases?
Integration of regional studies and extrapolation to larger space and time scales.
Chief scientistCarol Turley (Plymouth Marine Laboratory)
ProjectMicrobially Driven Biogeochemistry
Coordinating bodyPML (NERC)
Cruise reportRRS Discovery D261 cruise report d261.pdf — access key 'C' (1.54 MB) 
Ocean/sea areas 
GeneralEnglish Channel
Celtic Sea
North East Atlantic Ocean (limit 40W)
SpecificEnglish Channel; shelf edge off NE Atlantic (Celtic Sea)
Track chartsRRS Discovery D261 cruise track — d261trk.pdf (1.17 MB) 
Measurements 
Physical oceanography 
Surface measurements underway (T,S)Quantity: activity duration in days = 12
Description: Underway TSG
CTD stationsQuantity: number of profiles = 40
Description: CTD casts - press, temp, sal, fluorescence, OBS, attenuance, PAR, oxygen
Optics (eg underwater light levels)Quantity: number of profiles = 39
Description: Optics rig deployed - FRRF in profiling mode, AC-9, VSF, CTD, optical radiometers
Optics (eg underwater light levels)Quantity: number of profiles = 19
Description: Satlantic freefall optical profiler
Chemical oceanography 
OxygenQuantity: number of profiles = 10
Description: CTD bottle dissolved oxygen
NitrateDescription: Non-toxic nutrients
NitrateQuantity: number of profiles = 17
Description: CTD bottle nitrate
NitriteQuantity: number of profiles = 17
Description: CTD bottle nitrite
NitriteDescription: Non-toxic nutrients
AmmoniaQuantity: number of profiles = 10
Description: CTD bottle ammonia and urea (8 casts)
SilicateDescription: Non-toxic nutrients
SilicateQuantity: number of profiles = 16
Description: CTD bottle silicate
IsotopesQuantity: number of stations = 6
Description: Oxygen isotope, O2/Ar incubations
IsotopesQuantity: number of profiles = 7
Description: CTD bottle oxygen isotope measurements and dissolved O2/Ar
Other chemical oceanographic measurementsQuantity: number of samples = 200
Description: Halocarbons
Contamination 
Trace metalsQuantity: number of stations = 5
Description: Incubations for cycling of Cd, Mn and Zn by phytoplankton and bacterioplankton
Trace metalsQuantity: number of stations = 3
Description: Long-term zinc incubations, including measurements of total and labile dissolved Zn, tracemetal uptake, bacterial numbers, bacterial diversity, bacterial production and complexing capacity
Biology and fisheries 
Primary productivityQuantity: number of stations = 22
Description: CTD bottle photosynthesis-irradiance curves and absorption coefficients of particulates
Primary productivityQuantity: number of stations = 7
Description: 14C primary production incubations
Primary productivityQuantity: number of stations = 6
Description: Urea production incubations
Primary productivityQuantity: number of stations = 9
Description: Incubations for ETS, DCR, gross production, net community production.
Primary productivityQuantity: number of stations = 7
Description: Ammonium regeneration incubations
Primary productivityQuantity: number of samples = 4
Description: Non-toxic-electron transport system activity (ETS) and dark community respiration (DCR).
Primary productivityQuantity: number of stations = 7
Description: Size-fractionated 15N uptake incubations
Phytoplankton pigs (eg chlorophyll, fluorescence)Quantity: number of profiles = 8
Description: CTD bottle size-fractionated chlorophyll
Phytoplankton pigs (eg chlorophyll, fluorescence)Quantity: number of samples = 30
Description: Underway pump HPLC pigments
Phytoplankton pigs (eg chlorophyll, fluorescence)Quantity: number of stations = 19
Description: CTD bottle HPLC pigments
Phytoplankton pigs (eg chlorophyll, fluorescence)Quantity: activity duration in days = 12
Description: Underway fluorescence
Particulate organic matter (inc POC, PON)Quantity: number of stations = 22
Description: CTD bottle suspended particulate matter (SPM) and particulate organic carbon (POC) measurements
Dissolved organic matter (inc DOC)Quantity: number of stations = 22
Description: CTD bottle chromophoric dissolved organic material
PhytoplanktonQuantity: number of samples = 255
Description: Phytoplankton samples collected by underway deployment of CytoSub
PhytoplanktonQuantity: number of experiments = 1
Description: Phytoplankton degradation experiment - halocarbons, bacteria, pigments analysed.
PhytoplanktonQuantity: number of experiments = 1
Description: Production of halocarbons by diatom mat.
PhytoplanktonQuantity: number of stations = 11
Description: CTD bottles analysed for phytoplankton by flow cytometry and microscopic images
ZooplanktonQuantity: number of hauls = 43
Description: Vertical net samples for size-fractionated mesozooplankton biomass by microscopic and OPC analysis
ZooplanktonQuantity: number of stations = 8
Description: Incubation experiments to examine contribution of microzooplankton to copepod diet
ZooplanktonQuantity: number of stations = 8
Description: Microzooplankton grazing experiments and enzyme assay
ZooplanktonQuantity: activity duration in days = 5
Description: Optical plankton counter in continuous underway mode
ZooplanktonQuantity: number of profiles = 17
Description: Optical plankton counter in profiling mode
Pelagic bacteria/micro-organismsQuantity: number of profiles = 10
Description: CTD bottle (and non-toxic sample) bacterial production measurements
Pelagic bacteria/micro-organismsQuantity: number of stations = 7
Description: CTD bottle bacterial diversity measurements - DNA extraction, amplification of 16S rRNA gene, community profiles determined by DGGE
Other biological/fisheries measurementQuantity: number of hauls = 7
Description: Molecular analysis of embryonic gene expression in Calanus eggs.
Other biological/fisheries measurementQuantity: number of deployments = 4
Description: SAPs. Genetic control of diapause - pumping to collect Calanus but insufficient samples for analysis.
Meteorology 
Routine standard measurementsQuantity: activity duration in days = 12
Description: Meteorological package on ship making routine measurements
Moorings, landers, buoys 
Physical oceanography 
Surface drifters/drifting buoys49° 45' 0" N  10° 1' 59" W — Argos drifting buoy deployed - 15m-long drogue net used
Surface drifters/drifting buoys49° 45' 0" N  9° 16' 59" W — Argos drifting buoy recovered
Data held at BODC 
Discrete samples 
40  CTD frame plus rosette samplerDensity of the water column
Visible waveband radiance and irradiance measurements in the water column
Transmittance and attenuance of the water column
Chlorophyll pigment concentrations in water bodies
Salinity of the water column
Concentration of suspended particulate material in the water column
Temperature of the water column
Carotenoid and flavenoid pigment concentrations in water bodies
Dissolved oxygen parameters in the water column
24  Sample taken from ship's non-toxic supplyChlorophyll pigment concentrations in water bodies
Carotenoid and flavenoid pigment concentrations in water bodies