Resources

RRS James Clark Ross JR20120120 (JR255A)

Cruise summary report

Cruise Info. 
Ship name (ship code)RRS James Clark Ross (74JC)
Cruise identifierJR20120120 (JR255A)
Cruise period2012-01-20 — 2012-02-03
StatusCompleted
Port of departureStanley, Falkland Islands (Malvinas)
Port of returnMare Harbour, Falkland Islands (Malvinas)
PurposeResearch
ObjectivesThe objectives of the GENTOO project are:
(i) to quantify and understand the possible new source of dense water overflow and its variability; to determine the outflow's potential as an early indicator of Antarctic climate change; to assess the impact of changing dense overflows on the locations and strengths of the surface currents and frontal jets; to provide valuable constraints for climate models that describe how changes in ocean circulation feedback on and regulate climate change in polar latitudes.
(ii) to determine the krill biomass distribution and (temporal and spatial) variability to the east of the Antarctic Peninsula and its likely impact on the circumpolar krill ecosystem; to assess the impact of any variations in the location of the frontal jets (from objective i) on the krill biomass distribution; to alleviate a severe regional lack of field data on krill, a key species in the Antarctic food web.
To achieve the two objectives, our technological deliverable is a critical evaluation of our ability to measure (i) current velocity from a glider and (ii) krill biomass from a glider.
The GENTOO fieldwork in the Weddell Sea was accomplished through a SeaGlider campaign in early 2012. A glider deployment cruise (JR255A) was the primary data gathering exercise; as well as deploying three SeaGliders, a hydrographic survey was undertaken together with nets and underway biological, chemical and physical measurements. The recovery of the three gliders was to have taken place on the recovery cruise.
Chief scientistKaren J Heywood (University of East Anglia School of Environmental Sciences)
ProjectGliders: Excellent New Tools for Observing the Ocean (GENTOO)
Coordinating bodyNatural Environment Research Council (NERC)
Cruise reportRRS James Clark Ross JR20120120 (JR255A) cruise report jr255a.pdf (2.71 MB) 
Ocean/sea areas 
GeneralSouthern Ocean
SpecificDrake Passage, Weddell Sea, Powell Basin
Track chartsRRS James Clark Ross JR20120120 (JR255A) cruise track — jr255atrk.pdf (0.03 MB) 
Measurements 
Physical oceanography 
Surface measurements underway (T,S)Quantity: activity duration in days = 12
Description: Underway Temperature and Salinity of surface water
BathythermographQuantity: activity duration in days = 12
Description: Underway Temperature and Salinity of surface water
CTD stationsQuantity: number of stations = 41
Description: Vertical profiles of Salinity, Temperature, Dissolved Oxygen, Chlorophyll
Current profiler (eg ADCP)Quantity: activity duration in days = 12
Description: ADCP current velocities
Chemical oceanography 
IsotopesQuantity: number of stations = 9
Description: Nitrous oxide isotopes
Biology and fisheries 
Primary productivityQuantity: number of stations = 37
Description: Chlorophyll and phytoplankton data
CrustaceansQuantity: number of hauls = 5
Description: Krill sample catch
Acoustic reflection on marine organisms.Quantity: activity duration in days = 12
Description: EK60 backscatter data
Moorings, landers, buoys 
Physical oceanography 
Subsurface temperature and salinity measurements63° 22' 35" S  52° 58' 30" W — Seaglider 539 depoyment measuring dissolved oxygen, Temperature, Salinity, chlorophyll fluorescence
Subsurface temperature and salinity measurements61° 36' 29" S  48° 25' 35" W — Seaglider 546, measuring Temperature, Salinity
Subsurface temperature and salinity measurements63° 22' 17" S  52° 58' 35" W — Seaglider 522 deployment, measuring Chlorophyll fluroescence, Oxygen, Temperature, Salinity
Neutrally buoyant floats63° 1' 29" S  51° 30' 0" W — Argo float measuring Temperature and Salinity
Neutrally buoyant floats63° 31' 17" S  51° 7' 11" W — Argo float measuring Temperature and Salinity
Neutrally buoyant floats63° 31' 17" S  51° 7' 11" W — Argo float measuring Temperature and Salinity
Data held at BODC Get data
Series/Profiles 
25  Bottle station
Reference numbers
Particulate total and organic nitrogen concentrations in the water column
Vertical spatial coordinates
Quality control flags
Particulate total and organic carbon concentrations in the water column
Reference numbers
Particulate total and organic nitrogen concentrations in the water column
Vertical spatial coordinates
Quality control flags
Particulate total and organic carbon concentrations in the water column

BODC idDate/TimeLocationDoc.
20810402012-01-24 04:01 63° 29' 24" S  52° 7' 11" W  View metadata report for BODC series reference number 2081040
20812612012-01-29 00:02 62° 9' 49" S  53° 58' 3" W  View metadata report for BODC series reference number 2081261
20811682012-01-27 08:26 62° 55' 27" S  51° 21' 25" W  View metadata report for BODC series reference number 2081168
20811932012-01-27 17:50 62° 57' 8" S  51° 23' 19" W  View metadata report for BODC series reference number 2081193
20812122012-01-28 03:00 63° 4' 50" S  51° 33' 13" W  View metadata report for BODC series reference number 2081212
20812852012-01-29 11:39 61° 27' 26" S  54° 3' 2" W  View metadata report for BODC series reference number 2081285
20811322012-01-25 15:32 63° 9' 30" S  54° 24' 31" W  View metadata report for BODC series reference number 2081132
20810272012-01-23 22:27 63° 25' 12" S  52° 33' 32" W  View metadata report for BODC series reference number 2081027
20810642012-01-24 08:25 63° 33' 54" S  51° 42' 35" W  View metadata report for BODC series reference number 2081064
20812242012-01-28 07:37 63° 9' 41" S  51° 39' 3" W  View metadata report for BODC series reference number 2081224
20811072012-01-25 04:38 63° 20' 22" S  53° 0' 39" W  View metadata report for BODC series reference number 2081107
20812732012-01-29 06:10 61° 48' 33" S  54° 0' 32" W  View metadata report for BODC series reference number 2081273
20810392012-01-24 00:30 63° 28' 10" S  52° 18' 28" W  View metadata report for BODC series reference number 2081039
20811192012-01-25 09:02 63° 10' 38" S  53° 41' 57" W  View metadata report for BODC series reference number 2081119
20811202012-01-25 10:51 63° 9' 35" S  54° 4' 14" W  View metadata report for BODC series reference number 2081120
20812002012-01-27 20:40 62° 58' 26" S  51° 24' 53" W  View metadata report for BODC series reference number 2081200
20810522012-01-24 06:21 63° 31' 33" S  51° 56' 14" W  View metadata report for BODC series reference number 2081052
20810762012-01-24 11:06 63° 32' 22" S  51° 33' 28" W  View metadata report for BODC series reference number 2081076
20811812012-01-27 12:26 62° 55' 56" S  51° 21' 48" W  View metadata report for BODC series reference number 2081181
20812482012-01-28 17:14 63° 0' 2" S  52° 54' 43" W  View metadata report for BODC series reference number 2081248
20810152012-01-23 19:52 63° 22' 19" S  52° 58' 47" W  View metadata report for BODC series reference number 2081015
20810882012-01-24 14:22 63° 31' 20" S  51° 7' 1" W  View metadata report for BODC series reference number 2081088
20811442012-01-26 22:13 62° 57' 57" S  51° 51' 2" W  View metadata report for BODC series reference number 2081144
20811562012-01-27 04:39 62° 47' 46" S  51° 11' 47" W  View metadata report for BODC series reference number 2081156
20812362012-01-28 11:50 63° 12' 1" S  51° 42' 12" W  View metadata report for BODC series reference number 2081236
41  CTD/STD cast
Reference numbers
Transmittance and attenuance of the water column
Vertical spatial coordinates
Dissolved oxygen parameters in the water column
Salinity of the water column
Temperature of the water column
Density of the water column
Electrical conductivity of the water column
Chlorophyll pigment concentrations in water bodies
Reference numbers
Transmittance and attenuance of the water column
Vertical spatial coordinates
Dissolved oxygen parameters in the water column
Salinity of the water column
Temperature of the water column
Density of the water column
Electrical conductivity of the water column
Chlorophyll pigment concentrations in water bodies

BODC idDate/TimeLocationDoc.
18938382012-01-24 04:23:41 63° 29' 24" S  52° 7' 11" W  View metadata report for BODC series reference number 1893838
18939792012-01-25 23:35:33 63° 8' 48" S  51° 44' 51" W  View metadata report for BODC series reference number 1893979
18940792012-01-28 06:10:22 63° 7' 1" S  51° 35' 29" W  View metadata report for BODC series reference number 1894079
18941602012-01-29 03:45:12 61° 59' 10" S  53° 59' 13" W  View metadata report for BODC series reference number 1894160
18941962012-01-29 07:45:32 61° 43' 13" S  54° 1' 9" W  View metadata report for BODC series reference number 1894196
18942402012-01-31 00:22:44 61° 36' 30" S  48° 25' 48" W  View metadata report for BODC series reference number 1894240
18939802012-01-26 23:04:14 62° 57' 57" S  51° 51' 2" W  View metadata report for BODC series reference number 1893980
18940552012-01-28 00:56:25 63° 3' 6" S  51° 30' 45" W  View metadata report for BODC series reference number 1894055
18941112012-01-28 12:12:44 63° 12' 1" S  51° 42' 12" W  View metadata report for BODC series reference number 1894111
18941232012-01-28 15:34:08 62° 59' 52" S  52° 29' 18" W  View metadata report for BODC series reference number 1894123
18938262012-01-24 00:47:23 63° 28' 10" S  52° 18' 28" W  View metadata report for BODC series reference number 1893826
18940922012-01-28 10:34:23 63° 10' 58" S  51° 40' 44" W  View metadata report for BODC series reference number 1894092
18938512012-01-24 06:47:03 63° 31' 33" S  51° 56' 14" W  View metadata report for BODC series reference number 1893851
18939312012-01-25 09:15:15 63° 10' 38" S  53° 41' 57" W  View metadata report for BODC series reference number 1893931
18939672012-01-25 15:44:58 63° 9' 30" S  54° 24' 31" W  View metadata report for BODC series reference number 1893967
18940182012-01-27 13:29:24 62° 55' 56" S  51° 21' 48" W  View metadata report for BODC series reference number 1894018
18941592012-01-29 02:11:25 62° 4' 32" S  53° 58' 47" W  View metadata report for BODC series reference number 1894159
18942392012-01-30 08:30:03 63° 9' 24" S  51° 45' 30" W  View metadata report for BODC series reference number 1894239
18938022012-01-23 20:09:29 63° 22' 19" S  52° 58' 47" W  View metadata report for BODC series reference number 1893802
18938872012-01-24 15:11:59 63° 31' 20" S  51° 7' 1" W  View metadata report for BODC series reference number 1893887
18939062012-01-25 04:56:16 63° 20' 22" S  53° 0' 39" W  View metadata report for BODC series reference number 1893906
18940062012-01-27 09:28:54 62° 55' 27" S  51° 21' 25" W  View metadata report for BODC series reference number 1894006
18940312012-01-27 18:38:16 62° 57' 8" S  51° 23' 19" W  View metadata report for BODC series reference number 1894031
18940432012-01-27 21:24:45 62° 58' 26" S  51° 24' 53" W  View metadata report for BODC series reference number 1894043
18941842012-01-29 06:23:05 61° 48' 33" S  54° 0' 32" W  View metadata report for BODC series reference number 1894184
18942272012-01-29 12:02:17 61° 27' 26" S  54° 3' 2" W  View metadata report for BODC series reference number 1894227
18938752012-01-24 11:58:03 63° 32' 22" S  51° 33' 28" W  View metadata report for BODC series reference number 1893875
18939922012-01-27 05:44:45 62° 47' 46" S  51° 11' 47" W  View metadata report for BODC series reference number 1893992
18940672012-01-28 03:37:22 63° 4' 50" S  51° 33' 13" W  View metadata report for BODC series reference number 1894067
18940802012-01-28 08:17:43 63° 9' 41" S  51° 39' 3" W  View metadata report for BODC series reference number 1894080
18942032012-01-29 09:02:42 61° 37' 55" S  54° 1' 55" W  View metadata report for BODC series reference number 1894203
18942152012-01-29 10:25:57 61° 32' 37" S  54° 2' 34" W  View metadata report for BODC series reference number 1894215
18938142012-01-23 22:43:29 63° 25' 12" S  52° 33' 32" W  View metadata report for BODC series reference number 1893814
18938632012-01-24 09:00:26 63° 33' 54" S  51° 42' 35" W  View metadata report for BODC series reference number 1893863
18938992012-01-25 00:27:15 63° 22' 13" S  52° 48' 11" W  View metadata report for BODC series reference number 1893899
18939432012-01-25 11:01:25 63° 9' 35" S  54° 4' 14" W  View metadata report for BODC series reference number 1893943
18939552012-01-25 13:53:38 63° 9' 32" S  54° 54' 15" W  View metadata report for BODC series reference number 1893955
18941352012-01-28 17:26:48 63° 0' 2" S  52° 54' 43" W  View metadata report for BODC series reference number 1894135
18941472012-01-29 00:24:13 62° 9' 49" S  53° 58' 3" W  View metadata report for BODC series reference number 1894147
18941722012-01-29 05:07:51 61° 53' 52" S  53° 59' 54" W  View metadata report for BODC series reference number 1894172
18939182012-01-25 06:54:05 63° 16' 11" S  53° 19' 41" W  View metadata report for BODC series reference number 1893918
1  GPS positioning system
Reference numbers
Horizontal spatial co-ordinates
Date and time
Platform or instrument orientation
Horizontal platform movement
Reference numbers
Horizontal spatial co-ordinates
Date and time
Platform or instrument orientation
Horizontal platform movement

BODC idDate/TimeLocationDoc.
19021062012-01-20 00:00  — 2012-02-03 13:14 51° 41' 29" S  57° 49' 25" W — 51° 54' 5" S  58° 26' 14" W  View metadata report for BODC series reference number 1902106
1  Meteorological data logger
Visible waveband radiance and irradiance measurements in the atmosphere
Reference numbers
Horizontal spatial co-ordinates
Air pressure
Date and time
Air temperature
Wind strength and direction
Solar Radiation
Atmospheric humidity
Visible waveband radiance and irradiance measurements in the atmosphere
Reference numbers
Horizontal spatial co-ordinates
Air pressure
Date and time
Air temperature
Wind strength and direction
Solar Radiation
Atmospheric humidity

BODC idDate/TimeLocationDoc.
19021182012-01-20 00:00  — 2012-02-03 13:14 51° 41' 29" S  57° 49' 25" W — 51° 54' 5" S  58° 26' 14" W  View metadata report for BODC series reference number 1902118
1  Multiple instrument types
Reference numbers
Horizontal spatial co-ordinates
Sound velocity and travel time in the water column
Date and time
Salinity of the water column
Temperature of the water column
Electrical conductivity of the water column
Metadata parameters
Chlorophyll pigment concentrations in water bodies
Reference numbers
Horizontal spatial co-ordinates
Sound velocity and travel time in the water column
Date and time
Salinity of the water column
Temperature of the water column
Electrical conductivity of the water column
Metadata parameters
Chlorophyll pigment concentrations in water bodies

BODC idDate/TimeLocationDoc.
19021312012-01-20 00:00  — 2012-02-03 13:14 51° 41' 29" S  57° 49' 25" W — 51° 54' 5" S  58° 26' 14" W  View metadata report for BODC series reference number 1902131
1  Pumped water sample
Horizontal spatial co-ordinates
Date and time
Particulate total and organic nitrogen concentrations in the water column
Particulate total and organic carbon concentrations in the water column
Horizontal spatial co-ordinates
Date and time
Particulate total and organic nitrogen concentrations in the water column
Particulate total and organic carbon concentrations in the water column

BODC idDate/TimeLocationDoc.
20812972012-01-21 16:59  — 2012-01-23 17:28 63° 22' 30" S  55° 55' 11" W — 55° 51' 1" S  52° 7' 6" W  View metadata report for BODC series reference number 2081297
Discrete samples 
41  CTD frame plus rosette samplerParticulate total and organic nitrogen concentrations in the water column
Temperature of the water column
Particulate total and organic carbon concentrations in the water column
Chlorophyll pigment concentrations in water bodies
Concentration of silicon species in the water column
9  Sample taken from ship's non-toxic supplyParticulate total and organic nitrogen concentrations in the water column
Particulate total and organic carbon concentrations in the water column
Concentration of silicon species in the water column