Cruise inventory

RRS James Clark Ross JR20121114 (JR280)

Cruise summary report

Cruise Info. 
Ship name (ship code)RRS James Clark Ross (74JC)
Cruise identifierJR20121114 (JR280)
Cruise period2012-11-14 — 2012-12-11
StatusCompleted
Port of departureStanley, Falkland Islands (Malvinas)
Port of returnStanley, Falkland Islands (Malvinas)
PurposeResearch
ObjectivesJR280 is a 16 day science cruise to the South Georgia region nested inside a combined logistic and science leg during voyage 22 of the RRS James Clark Ross. As part of the logistics element the ship undertook base reliefs at Bird Island and King Edward Point (South Georgia), and Signy (South Orkney Islands). During the science part of the cruise we undertook the Western Core Box survey to determine the distribution and biomass of krill northwest of South Georgia, refurbished the biological moorings in the South Georgia region and deployed a new biological mooring near Signy. In addition collaborators from the Max Planck Institute in Bremen investigated the N2O emission potential of the Antarctic krill Euphausia superba.

Since 1981 BAS have undertaken cruises to determine krill biomass as part of the ongoing assessment of the status of the marine ecosystem in the region of South Georgia. This unique time series, known as the Western Core Box, is part of the Ecosystem Programme contribution to BAS national capability. It comprises an acoustic grid survey of 8 transects each of 80 km in length, together with associated net and oceanographic sampling and the calibration of the acoustic instrumentation. Net sampling to catch live krill for experiments and observations was also undertaken at night.

In addition to the acoustic survey, which covers a wide area but has limited temporal coverage, there are three moorings (one in the Western Core Box, one southwest and one northwest of South Georgia) to provide a temporal context. These moorings are recovered during the cruise, refurbished and data downloaded, and then redeployed later in the cruise.
Chief scientistJonathan L Watkins (British Antarctic Survey)
ProjectEcosystems Programme: Western Core Box
Coordinating bodyNatural Environment Research Council (NERC)
Cruise reportRRS James Clark Ross JR20121114 (JR280) cruise report jr280.pdf — access key 'C' (7.36 MB) 
Ocean/sea areas 
GeneralSouth West Atlantic Ocean (limit 20W)
Southern Ocean
SpecificSouth Georgia
Track chartsRRS James Clark Ross JR20121114 (JR280) cruise track — jr280trk.pdf (0.29 MB) 
Measurements 
Physical oceanography 
Surface measurements underway (T,S)Quantity: track kilometres = 7200
Description: ADCP
BathythermographQuantity: number of profiles = 28
Description: XBT
Water bottle stationsQuantity: number of samples = 43
Description: CTD Water Samples
CTD stationsQuantity: number of profiles = 16
Description: CTD
CTD stationsQuantity: number of profiles = 6
Description: CTD
Subsurface temperature measurementsDescription: Oxygen microsensors, pH
Chemical oceanography 
OxygenDescription: Oxygen microsensors, pH
pHDescription: Oxygen microsensors, pH
Biology and fisheries 
Biochemical measurements (eg lipids, amino acids)Quantity: number of samples = 43
Description: Gas samples from krill incubation (recording 45N2O and 46N2O)
ZooplanktonQuantity: number of samples = 43
Description: Krill samples
ZooplanktonQuantity: number of specimens = 800
Description: RMT8 - krill length measurements and photography
ZooplanktonQuantity: number of specimens = 815
Description: RMT8 - Macrozooplankton samples
Acoustic reflection on marine organisms.Quantity: activity duration in days = 25
Description: EK60 Multi-frequency scientific echo-sounder
Meteorology 
Routine standard measurementsQuantity: track kilometres = 7200
Description: Onboard ships meteorological
Geology and geophysics 
Single-beam echosoundingQuantity: track kilometres = 7200
Description: EA600 Single Beam
Multi-beam echosoundingQuantity: number of surveys = 2
Description: EM122 Swath
Moorings, landers, buoys 
Physical oceanography 
CTD stations60° 34' 31" S  46° 31' 2" W — Site: Deployed - Signy Inaccessible Trench Water Depth: 700m Instrumentation: CTD, ADCP
CTD stations55° 12' 19" S  41° 6' 25" W — Site: Recovered - P2 Water Depth: 3200m Instrumentation: Aquadoop current meter (1500m), Sediment Trap (1500m), Main Buoy - SBE CTD, RDI ADCP (near surface)
CTD stations55° 14' 6" S  41° 13' 47" W — Site: Deployed - P2 Water Depth: 3383m Instrumentation: Aquadoop current meter (1500m), Sediment Trap (1500m), Main Buoy - SBE CTD, RDI ADCP (near surface)
CTD stations53° 48' 7" S  37° 56' 37" W — Site: Recovered - Western Core Box Shallow Mooring Water Depth: 300m Instrumentation: Sonar bell (10m above release), Main buoy - (~240m) - ASL WCP, SBE CTD, RDI ADCP
CTD stations53° 47' 52" S  37° 55' 31" W — Site: Deployed - Western Core Box Shallow Mooring Water Depth: 300m Instrumentation: Main buoy - (~240m) - ASL WCP, SBE CTD, RDI ADCP
CTD stations52° 48' 37" S  40° 5' 46" W — Site: Recovered - P3 Water Depth: 3700m Instrumentation: Aquadoop current meter (2000m), Sediment Trap (2000m), Main Buoy - SBE CTD, RDI ADCP (near surface)
Current meters55° 14' 6" S  41° 13' 47" W — Site: Deployed - P2 Water Depth: 3383m Instrumentation: Aquadoop current meter (1500m), Sediment Trap (1500m), Main Buoy - SBE CTD, RDI ADCP (near surface)
Current meters52° 48' 37" S  40° 5' 46" W — Site: Recovered - P3 Water Depth: 3700m Instrumentation: Aquadoop current meter (2000m), Sediment Trap (2000m), Main Buoy - SBE CTD, RDI ADCP (near surface)
Current meters55° 12' 19" S  41° 6' 25" W — Site: Recovered - P2 Water Depth: 3200m Instrumentation: Aquadoop current meter (1500m), Sediment Trap (1500m), Main Buoy - SBE CTD, RDI ADCP (near surface)
Current profiler (eg ADCP)53° 48' 7" S  37° 56' 37" W — Site: Recovered - Western Core Box Shallow Mooring Water Depth: 300m Instrumentation: Sonar bell (10m above release), Main buoy - (~240m) - ASL WCP, SBE CTD, RDI ADCP
Current profiler (eg ADCP)52° 48' 37" S  40° 5' 46" W — Site: Recovered - P3 Water Depth: 3700m Instrumentation: Aquadoop current meter (2000m), Sediment Trap (2000m), Main Buoy - SBE CTD, RDI ADCP (near surface)
Current profiler (eg ADCP)55° 12' 19" S  41° 6' 25" W — Site: Recovered - P2 Water Depth: 3200m Instrumentation: Aquadoop current meter (1500m), Sediment Trap (1500m), Main Buoy - SBE CTD, RDI ADCP (near surface)
Current profiler (eg ADCP)60° 34' 31" S  46° 31' 2" W — Site: Deployed - Signy Inaccessible Trench Water Depth: 700m Instrumentation: CTD, ADCP
Current profiler (eg ADCP)55° 14' 6" S  41° 13' 47" W — Site: Deployed - P2 Water Depth: 3383m Instrumentation: Aquadoop current meter (1500m), Sediment Trap (1500m), Main Buoy - SBE CTD, RDI ADCP (near surface)
Current profiler (eg ADCP)53° 47' 52" S  37° 55' 31" W — Site: Deployed - Western Core Box Shallow Mooring Water Depth: 300m Instrumentation: Main buoy - (~240m) - ASL WCP, SBE CTD, RDI ADCP
Biology and fisheries 
Sediment traps55° 12' 19" S  41° 6' 25" W — Site: Recovered - P2 Water Depth: 3200m Instrumentation: Aquadoop current meter (1500m), Sediment Trap (1500m), Main Buoy - SBE CTD, RDI ADCP (near surface)
Sediment traps55° 14' 6" S  41° 13' 47" W — Site: Deployed - P2 Water Depth: 3383m Instrumentation: Aquadoop current meter (1500m), Sediment Trap (1500m), Main Buoy - SBE CTD, RDI ADCP (near surface)
Sediment traps52° 48' 37" S  40° 5' 46" W — Site: Recovered - P3 Water Depth: 3700m Instrumentation: Aquadoop current meter (2000m), Sediment Trap (2000m), Main Buoy - SBE CTD, RDI ADCP (near surface)
Geology and geophysics 
Single-beam echosounding53° 47' 52" S  37° 55' 31" W — Site: Deployed - Western Core Box Shallow Mooring Water Depth: 300m Instrumentation: Main buoy - (~240m) - ASL WCP, SBE CTD, RDI ADCP
Single-beam echosounding53° 48' 7" S  37° 56' 37" W — Site: Recovered - Western Core Box Shallow Mooring Water Depth: 300m Instrumentation: Sonar bell (10m above release), Main buoy - (~240m) - ASL WCP, SBE CTD, RDI ADCP
Long/short range side scan sonar53° 48' 7" S  37° 56' 37" W — Site: Recovered - Western Core Box Shallow Mooring Water Depth: 300m Instrumentation: Sonar bell (10m above release), Main buoy - (~240m) - ASL WCP, SBE CTD, RDI ADCP
Long/short range side scan sonar53° 47' 52" S  37° 55' 31" W — Site: Deployed - Western Core Box Shallow Mooring Water Depth: 300m Instrumentation: Main buoy - (~240m) - ASL WCP, SBE CTD, RDI ADCP