Resources

RRS James Clark Ross JR19950921 (AMT1, JRXX1)

Cruise summary report

Cruise Info. 
Ship name (ship code)RRS James Clark Ross (74JC)
Cruise identifierJR19950921 (AMT1, JRXX1)
Cruise period1995-09-21 — 1995-10-24
StatusCompleted
Port of departureGrimsby, United Kingdom
Port of returnStanley, Falkland Islands (Malvinas)
PurposeResearch
ObjectivesAtlantic Meridional Transect (AMT)

The primary objective of the AMT programme is to investigate basic biological processes in the open Atlantic Ocean over very broad spatial scales. For AMT-1, the meridional range covered was approximately 50° N to 50° S or nearly 8000 nmi. The measurements to be taken during the AMT cruises are fundamental for the calibration, validation, and continuing understanding of remotely sensed observations of biological oceanography. They are also important for understanding plankton community structure over latitudinal scales and the role of the world ocean in global carbon cycles. During AMT-1 a variety of instruments were used to map the physical, chemical, and biological structure of the upper 200m of the water column. Ocean colour measurements, photosynthetic activity and primary productivity, samples and data for planktonic assemblages, pCO2 and light attenuation were also measured. The AMT programme is also attempting to meet the needs of international agencies in their implementation of Sensor Intercomparison and Merger for Biological and Interdisciplinary Ocean Studies (SIMBOS), a programme to develop a methodology and operational capability to combine data products from the various ocean colour satellite missions. The AMT programme also forms a significant component of two NERC Special Topic PRIME projects, P19 and P20.

Objectives:
1. Acquire data for the calibration of remotely sensed observations (primary validation)
2. Secondary validation of remotely sensed products (e.g., chlorophyll concentration)
3. Develop models that enable the interpretation of satellite imagery in terms of total water column properties
4. Interpret basin-scale remote sensing observations
5. Understand further the interaction between physica processes and biological production
6. Identify and quantify latitudinal changes in biogeochemical provinces
7. Determine phytoplankton characteristics and photosynthetic parameters
8. Relate the partial pressure of CO2 (pCO2) in surface waters with the biological production
9. Identify nutrient regimes
10. Characterise plankton community structure, including the accurate determination of carbon values in accordance with Joint Global Ocean Flux Study (JGOFS) protocols
Chief scientistDavid Robins (Plymouth Marine Laboratory)
ProjectAMT
Cruise reportRRS James Clark Ross JR19950921 (AMT1, JRXX1) cruise report jr_amt1.pdf (4.18 MB) 
Ocean/sea areas 
GeneralNorth Atlantic Ocean
South Atlantic Ocean
Track chartsRRS James Clark Ross JR19950921 (AMT1, JRXX1) cruise track — jr_amt1track.pdf (0.07 MB) 
Measurements 
Physical oceanography 
BathythermographQuantity: number of deployments = 87
Description: XBT were deployed at a number of locations.
Water bottle stationsQuantity: number of stations = 25
Description: CTD bottle rosette readings were recorded. Depth range 7-200m.
CTD stationsQuantity: number of stations = 25
Description: CTD bottle rosette readings were recorded. Depth range 7-200m.
Contamination 
Suspended matterQuantity: number of measurements = 25
Description: Particulate carbon log. Depth Range 7-160m.
Biology and fisheries 
ZooplanktonQuantity: number of measurements = 25
Description: Zooplankton carbon log. Depth range 98-205m.
Data held at BODC Get data
Discrete samples 
25  CTD frame plus rosette samplerBacteria taxonomic abundance in water bodies
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
Chlorophyll pigment concentrations in water bodies
Phytoplankton taxonomic abundance in water bodies
Primary production in the water column
Metadata parameters
Silicate concentration parameters in the water column
Salinity of the water column
Carotenoid and flavenoid pigment concentrations in water bodies
Nitrate concentration parameters in the water column
Temperature of the water column
Microzooplankton taxonomic abundance in water bodies
Nitrite concentration parameters in the water column
Phosphate concentration parameters in the water column
Phaeopigment concentrations in the water column
Phytoplankton generic abundance in water bodies
Reference numbers
86  Expendable BathythermographTemperature of the water column
421  Sample taken from ship's non-toxic supplyChlorophyll pigment concentrations in water bodies
Silicate concentration parameters in the water column
Nitrate concentration parameters in the water column
Nitrite concentration parameters in the water column
Phosphate concentration parameters in the water column
Phaeopigment concentrations in the water column
25  WP-2 zooplankton netZooplankton taxonomy-related abundance per unit volume of the water column
Fish abundance in water bodies
Zooplankton non taxonomy-related abundance per unit volume of the water column