Resources

RRS James Clark Ross JR19960916 (AMT3, JR15)

Cruise summary report

Cruise Info. 
Ship name (ship code)RRS James Clark Ross (74JC)
Cruise identifierJR19960916 (AMT3, JR15)
Cruise period1996-09-16 — 1996-10-25
StatusCompleted
Port of departureGrimsby, United Kingdom
Port of returnStanley, Falkland Islands (Malvinas)
ObjectivesThe Atlantic Meridional Transects (AMTs) were conceived as a means of acquiring a time series of oceanographic, biological, chemical and optical data over large latitudinal ranges (50° N to 50° S) and through a number of contrasting oceanographic provinces. The core scientific objectives are to refine out understanding of the role of the ocean biota in the biogeochemical processes, carbon fluxes and ultimately global climate and to develop remotely-sensed measurements of global primary production.

The AMTs take advantage of the twice yearly passage of the NERC vessel, RRS James Clark Ross, operated by the British Antarctic Survey, during its passage to and from Antarctica each year. Since the only ship costs involved are to cover the additional time required for course deviations and station work, the AMT is a highly cost-effective project for fundamental marine science. AMT-3 is the third Atlantic transect in the current series.

Aims:
1. To improve our undestanding of the relationship between physical processes and biological production.
2. Identify, define and quantify latitudinal changes in biogeochemical provinces.
3. Determine phytoplankton characteristics and photosynthetic parameters.
4. Identify nutrient regimes and their role in biogeochemical cycles.
5. Characterise plankton community structure, including the accurate determination of carbon values
6. Relate the partial pressure of CO2 (pCO2) in surface waters with the biological production
7. Acquire data for the calibration of remotely sensed obersvations (primary validation).
Chief scientistTony Bale (Plymouth Marine Laboratory)
ProjectAMT
Cruise reportRRS James Clark Ross JR19960916 (AMT3, JR15) cruise report jr_amt3.pdf (3.46 MB) 
Ocean/sea areas 
GeneralNorth Atlantic Ocean
South Atlantic Ocean
Track chartsRRS James Clark Ross JR19960916 (AMT3, JR15) cruise track — jr_amt3track.pdf (0.02 MB) 
Measurements 
Physical oceanography 
BathythermographDescription: XBT's were deployed and temperatute profiles were obtained upto depths of 1830m. No. of deployments not noted.
Water bottle stationsQuantity: number of stations = 30
Description: A number of stations were sampled. CTD/rosette deployments were made. Water bottle samples were taken. Vericle hauls were taken for zooplankton samples. Sea and sky photographs were taken.
CTD stationsQuantity: number of stations = 30
Description: A number of stations were sampled. CTD/rosette deployments were made. Water bottle samples were taken. Vericle hauls were taken for zooplankton samples. Sea and sky photographs were taken.
Subsurface temperature and salinity measurementsDescription: Underway measurements were made. Salinity, temperature and fluroescence were recorded. Meteorological data was also logged. No. of measurements not noted.
Subsurface temperature and salinity measurementsDescription: Salinity and temperature calibrations recorded. No. of samples not noted.
Optics (eg underwater light levels)Description: Ocean colour optical data was gathered. No. of samples not noted.
Contamination 
Suspended matterQuantity: number of samples = 1
Description: Particulates and zooplankton samples were taken. No. of samples not taken.
Biology and fisheries 
Phytoplankton pigs (eg chlorophyll, fluorescence)Description: Chlorophyll samples were also taken. No. of samples not noted
ZooplanktonQuantity: number of stations = 30
Description: A number of stations were sampled. CTD/rosette deployments were made. Water bottle samples were taken. Vericle hauls were taken for zooplankton samples. Sea and sky photographs were taken.
ZooplanktonQuantity: number of samples = 1
Description: Particulates and zooplankton samples were taken. No. of samples not taken.
Data held at BODC Get data
Discrete samples 
50  CTD frame plus rosette samplerPhytoplankton taxonomic biomass in water bodies
Dissolved metal concentrations in the water column
Particulate total and organic carbon concentrations in the water column
Particulate total and organic nitrogen concentrations in the water column
Density of the water column
Bacteria non taxonomy-related biomass expressed as carbon per unit volume of the water column
Bacteria generic abundance in water bodies
Metadata parameters
Chlorophyll pigment concentrations in water bodies
Total metal concentrations in water bodies
Phytoplankton taxonomic abundance in water bodies
Primary production in the water column
Silicate concentration parameters in the water column
Raw fluorometer output
Salinity of the water column
Temperature of the water column
Carotenoid and flavenoid pigment concentrations in water bodies
Nitrate concentration parameters in the water column
Plankton abundance per unit volume of the water column
Reference numbers
Plankton biomass expressed as carbon per unit volume of the water column
Nitrite concentration parameters in the water column
Phosphate concentration parameters in the water column
Phaeopigment concentrations in the water column
117  Expendable BathythermographTemperature of the water column
333  Sample taken from ship's non-toxic supplyDissolved metal concentrations in the water column
Chlorophyll pigment concentrations in water bodies
Total metal concentrations in water bodies
Carotenoid and flavenoid pigment concentrations in water bodies
Phaeopigment concentrations in the water column
98  WP-2 zooplankton net
53  Wetlabs 9 channel transmissometer