Cruise inventory

RRS James Clark Ross JR20110409 (JR276)

Cruise summary report

Cruise inventory

Cruise Info. 
Ship name (ship code)RRS James Clark Ross (74JC)
Cruise identifierJR20110409 (JR276)
Cruise period2011-04-09 — 2011-04-26
StatusCompleted
Port of departurePunta Arenas, Chile
Port of returnStanley, Falkland Islands (Malvinas)
PurposeResearch
ObjectivesJR276 was part of DIMES, "Diapycnal and Isopycnal Mixing Experiment in the Southern Ocean", a joint UK and US project funded by the National Science Foundation in the US and NERC in the UK. The objective of DIMES was "to test and, if necessary, redefine the present paradigm of Southern Ocean mixing by obtaining the first systematic measurements of mixing processes in two contrasting regimes (the SE Pacific and the SW Atlantic) of the Antarctic Circumpolar Current (ACC)".

The methods of relevance to this cruise were:
(1) the release of an inert chemical tracer, CF3SF5 (tri-fluoromethyl sulphur pentafluoride) in the SE Pacific sector west of Drake Passage and following its dispersion horizontally and laterally as it transits the SE Pacific, Drake passage and the Scotia Sea
(2) The use of fine structure and microstructure measurements from Lowered ADCP, CTD and free-falling microstructure probes
(3) the release of surface drifters and neutral density floats.

This cruise took place about two years after the experiment was initiated by release of tracer and floats in the SE Pacific. Its specific objective was to observe the distribution of tracer and make measurements of turbulence on sections either side of Drake Passage, to quantify the mixing taking place in that region.

The western section was along 78°W in the SE Pacific sector of the Southern Ocean, from 56.5°S to 64°S. It comprised 38 CTD and water bottle rosette stations, at various spacings but with those between 60° and 62° being very closely spaced, about 1/8 degree. The eastern section was along part of the CLIVAR repeat hydrography SR1 line, from 59°S 55.85W, to 55.14°S 58°W, with 14 CTD /rosette stations, about every 20 nautical miles. Vertical microstructure profiles were also measured on a total 14 of the stations, using a free-falling instrument manufactured by Rockland Scientific. Thirteen surface drifters and six subsurface RAFOS floats were released in clusters at two locations on the cruise track between the two sections, to study the evolution of Lagrangian coherent structures in the velocity field and their role in mixing Underway data (surface TSG, met, ADCP and swath bathymetry) were collected continuously once the vessel had left Chilean waters, just before the first station on the S3 line.
Chief scientistAndrew J Watson (University of East Anglia School of Environmental Sciences)
ProjectDIMES (Diapycnal and Isopycnal Mixing Experiment in the Southern Ocean)
Coordinating bodyNational Oceanography Centre, Southampton/Woods Hole Oceanographic Institution
Cruise reportRRS James Clark Ross JR20110409 (JR276) cruise report jr276.pdf — access key 'C' (6.08 MB) 
Ocean/sea areas 
GeneralSouth West Atlantic Ocean (limit 20W)
SpecificDrake Passage
Track chartsRRS James Clark Ross JR20110409 (JR276) cruise track — jr276trk.pdf (0.06 MB) 
Measurements 
Physical oceanography 
Surface measurements underway (T,S)Quantity: track kilometres = 1930
Description: Thermosalinograph
CTD stationsQuantity: number of profiles = 55
Description: CTD data from stations
Geochemical tracers (eg freons)Quantity: number of profiles = 52
Description: Measurements of released tracer, SF¬6 and CFCs 12 and 13 using samples drawn from water bottles on 24 bottle rosette.
Current profiler (eg ADCP)Quantity: number of profiles = 55
Description: Lowered ADCP
Current profiler (eg ADCP)Quantity: track kilometres = 1930
Description: Vessel-mounted ADCP
Surface drifters/drifting buoysQuantity: number of deployments = 13
Description: Surface drifters
Neutrally buoyant floatsQuantity: number of deployments = 6
Description: Neutrally buoyant RAFOS floats
Other physical oceanographic measurementsQuantity: number of profiles = 14
Description: Vertical temperature and velocity microstructure using Rockland Scientific VMP
Chemical oceanography 
Carbon dioxideQuantity: track kilometres = 1930
Description: Continuous underway surface pCO2
AlkalinityQuantity: number of samples = 25
Description: Alkalinity/TCO2 samples for later analysis
Meteorology 
Routine standard measurementsQuantity: track kilometres = 1930
Description: Meteorological package (barometer, wind speed, wind direction, humidity, TIR, PAR)
Data held at BODC 
Series/Profiles 
53  CTD/STD cast
Density of the water column
Temperature of the water column
Salinity of the water column
Reference numbers
Vertical spatial coordinates
[Show series]
Density of the water column
Temperature of the water column
Salinity of the water column
Reference numbers
Vertical spatial coordinates
[Hide series]

BODC idDate/TimeLocationDoc.
10893692011-04-25 14:29:46  — 2011-04-25 15:17:08 55° 4' 1" S  57° 58' 25" W  View metadata report for BODC series reference number 1089369
10893702011-04-12 19:16:01  — 2011-04-12 20:07:03 58° 9' 59" S  78° 0' 0" W  View metadata report for BODC series reference number 1089370
10893822011-04-13 00:24:05  — 2011-04-13 01:13:38 58° 34' 58" S  77° 59' 52" W  View metadata report for BODC series reference number 1089382
10893942011-04-13 06:16:33  — 2011-04-13 07:54:28 58° 59' 59" S  77° 59' 57" W  View metadata report for BODC series reference number 1089394
10894012011-04-13 13:40:33  — 2011-04-13 14:31:33 59° 11' 59" S  78° 0' 0" W  View metadata report for BODC series reference number 1089401
10888272011-04-11 15:44:01  — 2011-04-11 17:05:45 56° 29' 59" S  77° 59' 59" W  View metadata report for BODC series reference number 1088827
10888392011-04-13 17:22:13  — 2011-04-13 18:12:30 59° 23' 59" S  77° 59' 59" W  View metadata report for BODC series reference number 1088839
10888402011-04-13 21:09:57  — 2011-04-13 21:55:59 59° 36' 0" S  77° 59' 58" W  View metadata report for BODC series reference number 1088840
10888522011-04-14 04:20:58  — 2011-04-14 05:14:57 59° 47' 59" S  77° 59' 59" W  View metadata report for BODC series reference number 1088852
10888642011-04-14 08:16:02  — 2011-04-14 09:09:38 59° 59' 59" S  77° 59' 59" W  View metadata report for BODC series reference number 1088864
10888762011-04-14 11:31:48  — 2011-04-14 12:21:19 60° 7' 3" S  77° 59' 59" W  View metadata report for BODC series reference number 1088876
10888882011-04-14 15:15:36  — 2011-04-14 16:44:38 60° 14' 6" S  78° 0' 0" W  View metadata report for BODC series reference number 1088888
10889072011-04-15 01:44:52  — 2011-04-15 02:23:44 60° 21' 10" S  77° 59' 59" W  View metadata report for BODC series reference number 1088907
10889192011-04-15 04:36:48  — 2011-04-15 05:22:53 60° 28' 14" S  77° 59' 57" W  View metadata report for BODC series reference number 1088919
10889202011-04-15 07:31:28  — 2011-04-15 08:14:39 60° 35' 17" S  77° 59' 51" W  View metadata report for BODC series reference number 1088920
10889322011-04-15 10:27:31  — 2011-04-15 11:10:12 60° 42' 21" S  78° 0' 0" W  View metadata report for BODC series reference number 1088932
10889442011-04-15 13:15:21  — 2011-04-15 13:56:14 60° 49' 24" S  77° 59' 59" W  View metadata report for BODC series reference number 1088944
10889562011-04-15 16:01  — 2011-04-15 16:44:40 60° 56' 27" S  77° 59' 58" W  View metadata report for BODC series reference number 1088956
10889682011-04-15 18:48:35  — 2011-04-15 19:30:26 61° 3' 31" S  77° 59' 58" W  View metadata report for BODC series reference number 1088968
10889812011-04-15 21:36:18  — 2011-04-15 22:15:41 61° 10' 35" S  77° 59' 59" W  View metadata report for BODC series reference number 1088981
10889932011-04-16 00:21:42  — 2011-04-16 01:03:13 61° 17' 38" S  78° 0' 0" W  View metadata report for BODC series reference number 1088993
10890072011-04-16 03:40:56  — 2011-04-16 05:17:04 61° 24' 42" S  77° 59' 59" W  View metadata report for BODC series reference number 1089007
10890192011-04-16 10:28:57  — 2011-04-16 11:12:50 61° 31' 46" S  78° 0' 0" W  View metadata report for BODC series reference number 1089019
10890202011-04-16 13:20:40  — 2011-04-16 14:02:33 61° 38' 49" S  77° 59' 59" W  View metadata report for BODC series reference number 1089020
10890322011-04-16 16:06:09  — 2011-04-16 16:52:20 61° 45' 53" S  77° 59' 58" W  View metadata report for BODC series reference number 1089032
10890442011-04-12 02:07:13  — 2011-04-12 02:56:14 56° 54' 59" S  77° 59' 59" W  View metadata report for BODC series reference number 1089044
10890562011-04-16 18:59:59  — 2011-04-16 19:38:31 61° 52' 56" S  77° 59' 58" W  View metadata report for BODC series reference number 1089056
10890682011-04-16 21:30:25  — 2011-04-16 22:16:26 61° 59' 59" S  78° 0' 0" W  View metadata report for BODC series reference number 1089068
10890812011-04-17 01:27:51  — 2011-04-17 02:55:09 62° 13' 19" S  78° 0' 0" W  View metadata report for BODC series reference number 1089081
10890932011-04-17 08:03:16  — 2011-04-17 08:47:19 62° 26' 39" S  77° 59' 59" W  View metadata report for BODC series reference number 1089093
10891002011-04-17 11:21:32  — 2011-04-17 12:03:27 62° 39' 59" S  78° 0' 0" W  View metadata report for BODC series reference number 1089100
10891122011-04-17 14:45:03  — 2011-04-17 15:25:59 62° 53' 19" S  77° 59' 59" W  View metadata report for BODC series reference number 1089112
10891242011-04-17 18:32:06  — 2011-04-17 19:58:44 63° 6' 39" S  78° 0' 0" W  View metadata report for BODC series reference number 1089124
10891362011-04-18 01:05:42  — 2011-04-18 01:45:26 63° 19' 59" S  78° 0' 0" W  View metadata report for BODC series reference number 1089136
10891482011-04-18 04:13:37  — 2011-04-18 04:57:20 63° 33' 19" S  77° 59' 59" W  View metadata report for BODC series reference number 1089148
10891612011-04-18 07:21:27  — 2011-04-18 08:03:03 63° 46' 39" S  78° 0' 0" W  View metadata report for BODC series reference number 1089161
10891732011-04-12 07:24:30  — 2011-04-12 08:20:04 57° 19' 59" S  77° 59' 59" W  View metadata report for BODC series reference number 1089173
10891852011-04-18 11:15:12  — 2011-04-18 12:39:53 63° 59' 59" S  77° 59' 59" W  View metadata report for BODC series reference number 1089185
10891972011-04-21 09:53:08  — 2011-04-21 11:07:08 59° 0' 1" S  55° 51' 21" W  View metadata report for BODC series reference number 1089197
10892042011-04-21 16:07:59  — 2011-04-21 17:18:13 58° 41' 4" S  56° 3' 18" W  View metadata report for BODC series reference number 1089204
10892162011-04-21 22:14:12  — 2011-04-21 23:24:34 58° 21' 37" S  56° 13' 45" W  View metadata report for BODC series reference number 1089216
10892282011-04-22 05:34:10  — 2011-04-22 06:47:44 58° 3' 1" S  56° 26' 45" W  View metadata report for BODC series reference number 1089228
10892412011-04-22 11:31:28  — 2011-04-22 12:40:41 57° 44' 0" S  56° 38' 25" W  View metadata report for BODC series reference number 1089241
10892532011-04-22 17:31:50  — 2011-04-22 18:40:01 57° 24' 56" S  56° 50' 23" W  View metadata report for BODC series reference number 1089253
10892652011-04-23 12:24:27  — 2011-04-23 13:49:41 57° 5' 40" S  57° 2' 3" W  View metadata report for BODC series reference number 1089265
10892772011-04-23 19:18:51  — 2011-04-23 20:20:46 56° 46' 56" S  57° 13' 44" W  View metadata report for BODC series reference number 1089277
10892892011-04-24 03:12:07  — 2011-04-24 04:28:39 56° 28' 4" S  57° 25' 29" W  View metadata report for BODC series reference number 1089289
10892902011-04-12 12:20:37  — 2011-04-12 13:48:36 57° 44' 59" S  77° 59' 58" W  View metadata report for BODC series reference number 1089290
10893082011-04-24 07:00:17  — 2011-04-24 07:48:24 56° 28' 2" S  57° 25' 29" W  View metadata report for BODC series reference number 1089308
10893212011-04-24 11:29:24  — 2011-04-24 12:36:40 56° 9' 15" S  57° 36' 16" W  View metadata report for BODC series reference number 1089321
10893332011-04-24 17:00:06  — 2011-04-24 18:27:49 55° 50' 28" S  57° 48' 31" W  View metadata report for BODC series reference number 1089333
10893452011-04-25 00:43:19  — 2011-04-25 01:59:34 55° 31' 8" S  58° 0' 53" W  View metadata report for BODC series reference number 1089345
10893572011-04-25 06:09:18  — 2011-04-25 07:09:45 55° 8' 30" S  57° 59' 59" W  View metadata report for BODC series reference number 1089357