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RRS James Clark Ross JR19990315 (JR40)

Cruise summary report

Cruise Info. 
Ship name (ship code)RRS James Clark Ross (74JC)
Cruise identifierJR19990315 (JR40)
Cruise period1999-03-15 — 1999-04-22
StatusCompleted
Port of departureStanley, Falkland Islands (Malvinas)
Port of returnStanley, Falkland Islands (Malvinas)
ObjectivesALBATROSS - Antarctic Large-scale Box Analysis and The Role Of the Scotia Sea.

Narrative:
A test station (001) was completed - full depth, all bottles fired at 3200m for CFC bottle blanks and the XBT launched. Section across the Drake Passage (stations 2-46) began 18th March. Stations spaced on every 500m depth contour. Deep stations (4000m) included southwards repeating the stations occupied by the WOCE A21 cruise. Drake Passage section completed on 26th March. CTD cable had caused a lot of trouble so would be replaced at Rothera.

Arrived in Rothera 27th March and departed 28th. The intensive southern section of closely spaced stations to the South Orkneys was begun on 31st March and finished on 2nd April. A 12 hour echo sounder survey was made across the Orkney Passage to accurately locate the sill of the Passage and deduce the number of stations required. 3rd-4th April Orkney Passage sampled. Stations continued in the South Scotia Ridge. A POL BPR was recovered on 8th April. Stations began on the Maurice Ewing Bank section on 14th April. 17th April headed back to Stanley.

Results:
170 CTD rosette water bottle stations were occupied in depths 100 - 4700m with LADCP. Ship-mounted ADCP - primarily operated in water tracking mode but if water <500m then switched to bottom-tracking mode.

2) Salinity, dissolved oxygen, silicate, nitrate+nitrite and phosphate: 170 samples
3) Oxygen isotopes: 16 samples
4) CFC11, CFC12, CFC13 and CCl4: 69 samples
5) Tritium: 67 samples
6) Helium: 67 samples
7) SF6: 17 samples
Chief scientistKaren J Heywood (University of East Anglia School of Environmental Sciences)
ProjectALBATROSS
Cruise reportRRS James Clark Ross JR19990315 (JR40) cruise report jr40_99.pdf (2.55 MB) 
Ocean/sea areas 
GeneralSouth Atlantic Ocean
South Pacific Ocean
SpecificScotia Sea/Drake Passage
Track chartsRRS James Clark Ross JR19990315 (JR40) cruise track — jr40_99track.pdf (0.02 MB) 
Measurements 
Physical oceanography 
BathythermographDescription: XBT's were launched throughout the cruise. No. of deployments not noted.
Water bottle stationsQuantity: number of stations = 170
Description: (including 46 along the Drake Passage and 7 in calm weather) CTD with rosette sampler
CTD stationsQuantity: number of stations = 170
Description: (including 46 along the Drake Passage and 7 in calm weather) CTD with rosette sampler
Subsurface temperature and salinity measurementsQuantity: number of samples = 170
Description: obtained with rosette bottle sampler
Current profiler (eg ADCP)Description: shipborne ADCPs were used throughout the cruise. On day 84 the signal penetration greatly improved
Chemical oceanography 
OxygenQuantity: number of samples = 170
Description: obtained with rosette bottle sampler
Other dissolved gasesQuantity: number of samples = 67
Description: tritium and helium obtained with rosette bottle sampler
PhosphateQuantity: number of samples = 170
Description: obtained with rosette bottle sampler
NitrateQuantity: number of samples = 170
Description: obtained with rosette bottle sampler
NitriteQuantity: number of samples = 170
Description: obtained with rosette bottle sampler
SilicateQuantity: number of samples = 170
Description: obtained with rosette bottle sampler
IsotopesQuantity: number of samples = 16
Description: oxygen isotopes, obtained with rosette bottle sampler
Other chemical oceanographic measurementsQuantity: number of samples = 17
Description: SF6, obtained with rosette bottle sampler
Contamination 
Chlorinated hydrocarbonsQuantity: number of samples = 69
Description: CFC11, CFC12, CFC13 and CCl4, obtained with rosette bottle sampler