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RRS James Clark Ross JR19970914 (AMT5, JR23)

Cruise summary report

Cruise Info. 
Ship name (ship code)RRS James Clark Ross (74JC)
Cruise identifierJR19970914 (AMT5, JR23)
Cruise period1997-09-14 — 1997-10-17
StatusCompleted
Port of departureGrimsby, United Kingdom
Port of returnStanley, Falkland Islands (Malvinas)
ObjectivesThe Atlantic Meridional Transect (AMT) Program exploits the passage of the Royal Research Ship (RRS) James Clark Ross (JCR) latitudinally through the Atlantic Ocean between the United Kingdom and the Falkland Islands (approximately 52° N to 52° S) in support of British Antarctic Survey (BAS) research activities in the Antarctic and its environs. In September, the JCR sails southward, sampling the boreal fall and the austral spring; the following April it returns to the UK sampling the austral fall and the boreal spring.

There are three objectives of the AMT Program. The first is to derive an improved understanding of the links between biogeochemical processes, biogenic gas exchange, air-sea interactions, and the effects on, and the responses of, oceanic ecosystems to climate change. The second is to investigate the functional roles of biological particles and processes that influence ocean colour in ecosystem dynamics. The Program relates directly to algorithm development and the validation of remotely-sensed observations of ocean colour. Because the Sea-viewing Wide-Field-of-view Sensor (SeaWiFS) instrument achieved operational status during the cruise (on 18th September). AMT-5 was designated the SeaWiFS data during the first 100 days of operations. This third objective involved in the near-real time reporting of in situ light and prigment obersvations to the Sea WiFS Project, so the performance of the satellite sensor could be determined.
Chief scientistJames Aiken (Plymouth Marine Laboratory)
ProjectAMT
Cruise reportRRS James Clark Ross JR19970914 (AMT5, JR23) cruise report jr_amt5.pdf (1.56 MB) 
Ocean/sea areas 
GeneralNorth Atlantic Ocean
South Atlantic Ocean
Measurements 
Physical oceanography 
Water bottle stationsDescription: Water bottle samples were collected. No. of samples not noted.
CTD stationsQuantity: number of measurements = 1
Description: CTD data was gathered from several stations. No. of stations sampled no noted.
Optics (eg underwater light levels)Description: Optical data was gathered from various stations. No. of samples not noted.
Biology and fisheries 
Phytoplankton pigs (eg chlorophyll, fluorescence)Description: Underway data samples were taken. Pigments and zooplankton samples were collected. No. of samples not noted.
ZooplanktonDescription: Underway data samples were taken. Pigments and zooplankton samples were collected. No. of samples not noted.
Data held at BODC Get data
Discrete samples 
35  CTD frame plus rosette samplerParticulate total and organic carbon concentrations in the water column
Particulate total and organic nitrogen concentrations in the water column
Visible waveband radiance and irradiance measurements in the water column
Transmittance and attenuance of the water column
Organosulphur and organoselenium species concentration parameters in water bodies
Density of the water column
Metadata parameters
Chlorophyll pigment concentrations in water bodies
Primary production in the water column
Raw fluorometer output
Silicate concentration parameters in the water column
Salinity of the water column
Temperature of the water column
Carotenoid and flavenoid pigment concentrations in water bodies
Raw light meter output
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
134  Expendable BathythermographTemperature of the water column
460  Sample taken from ship's non-toxic supplyParticulate total and organic carbon concentrations in the water column
Particulate total and organic nitrogen concentrations in the water column
Organosulphur and organoselenium species concentration parameters in water bodies
Chlorophyll pigment concentrations in water bodies
Carotenoid and flavenoid pigment concentrations in water bodies
Phaeopigment concentrations in the water column
42  WP-2 zooplankton net