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RRS James Clark Ross JR20000912 (AMT11, JR52 Leg1, JR53)

Cruise summary report

Cruise Info. 
Ship name (ship code)RRS James Clark Ross (74JC)
Cruise identifierJR20000912 (AMT11, JR52 Leg1, JR53)
Cruise period2000-09-12 — 2000-10-11
StatusCompleted
Port of departureGrimsby, United Kingdom
Port of returnMontevideo, Uruguay
PurposeResearch
ObjectivesThe AMT11 cruise sailed from Grimsby in the United Kingdom on 12th September 2000, and ended in Montevideo, Uruguay on October 11th.
The long-term objectives of the AMT programme are:
1. To better understand the links between biogeochemical processes, biogenic gas exchange, air-sea interactions and the effects on and the responses of oceanic ecosystems to climate change.
2. To investigate the functional roles of biological particles, and the processes that influence ocean colour in ecosystem dynamics.
3. To develop algorithms and the validation of remotely sensed observations of ocean colour.
As previously the cruise was centred close to 20 degrees West for the southern transect in the northern hemisphere, the track then deviated to the east to carry out the BAS swath bathymetry research survey (refer to cruise report JR53), which was essentially a cruise within the AMT whose main objective was to survey an 80 km section of the Mid-Atlantic Ridge. Following this work, the cruise transect headed south-westerly past Ascension Island across the south Atlantic gyre, and on to Montevideo, Uruguay.
During AMT11 and JR53, work was undertaken to test and develop the AutoFlux air-sea interaction system amd its assocaited prototype instrumentation. The system is intended to provide real-time air-sea fluxes of momentum, sensible heat, latent heat and CO2 in addition to meteorological parameters. Work on this system continued on the subsequent cruise from 11 Oct to 17 Oct 2000 between Montevideo, Uruguay and Stanley, Falkland Islands (JR52 Leg2, JR20001013).
Chief scientistE Malcolm S Woodward (Plymouth Marine Laboratory)
ProjectAtlantic Meridonal Transect (AMT)
Cruise reportRRS James Clark Ross JR20000912 (AMT11, JR52 Leg1, JR53) cruise report jr52.pdf (8.11 MB)  RRS James Clark Ross JR20000912 (AMT11, JR52 Leg1, JR53) cruise report jr53.pdf (4.75 MB)  RRS James Clark Ross JR20000912 (AMT11, JR52 Leg1, JR53) cruise report jr_amt11.pdf (2.44 MB) 
Ocean/sea areas 
GeneralNorth Atlantic Ocean
South Atlantic Ocean
Track chartsRRS James Clark Ross JR20000912 (AMT11, JR52 Leg1, JR53) cruise track — jr_amt11track.pdf (0.04 MB) 
Measurements 
Physical oceanography 
Water bottle stationsDescription: Regular sampling of non-toxic surface water. No. of smaples not noted.
CTD stationsDescription: CTD equipment and the Sound Velocity Profiler were tested, to insure they were both operational. No. of test not noted.
Chemical oceanography 
PhosphateDescription: Nutrient sampling took place. Nitrates, Nitrites, Silicate, Phosphate and Ammonia were all collected. No. of samples not noted.
NitrateDescription: Nutrient sampling took place. Nitrates, Nitrites, Silicate, Phosphate and Ammonia were all collected. No. of samples not noted.
NitriteDescription: Nutrient sampling took place. Nitrates, Nitrites, Silicate, Phosphate and Ammonia were all collected. No. of samples not noted.
AmmoniaDescription: Nutrient sampling took place. Nitrates, Nitrites, Silicate, Phosphate and Ammonia were all collected. No. of samples not noted.
SilicateDescription: Nutrient sampling took place. Nitrates, Nitrites, Silicate, Phosphate and Ammonia were all collected. No. of samples not noted.
Biology and fisheries 
PhytoplanktonDescription: Phytoplankton samples were collected. No. of samples not noted.
ZooplanktonDescription: Zooplankton samples were collected. No. of samples not noted.
Gear researchQuantity: number of deployments = 1
Description: At AMT11 station 03a, a sound velocity profiler was trialled
Geology and geophysics 
Multi-beam echosoundingQuantity: number of surveys = 1
Description: multibeam survey
Multi-beam echosoundingQuantity: activity duration in days = 28
Description: TOPAS and EM120 data was collected throughout the cruise
Data held at BODC Get data
Discrete samples 
46  CTD frame plus rosette samplerAmmonium and ammonia concentration parameters in water bodies
Bacteria taxonomic abundance in water bodies
Oxygen production and respiration in the water column
Light absorption in the water column
Visible waveband radiance and irradiance measurements in the water column
Density of the water column
Bacteria generic abundance in water bodies
Primary production in the water column
Bacterial production in the water column
Chlorophyll pigment concentrations in water bodies
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
Raw light meter output
Nitrate concentration parameters in the water column
Phosphate concentration parameters in the water column
Dissolved oxygen parameters in the water column
Nitrite concentration parameters in the water column
131  Sample taken from ship's non-toxic supplyChlorophyll pigment concentrations in water bodies