RRS James Clark Ross JR20110409 (JR276, UKD-2.5)

Cruise summary report

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Cruise Info.

Ship name (ship code)

RRS James Clark Ross (74JC)

Cruise identifier

JR20110409 (JR276, UKD-2.5)

Cruise period

2011-04-09 — 2011-04-26

Status

Completed

Port of departure

Punta Arenas, Chile

Port of return

Stanley, Falkland Islands (Malvinas)

Purpose

Research

Objectives

JR276 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 scientist

Andrew J Watson (University of East Anglia School of Environmental Sciences)

Project

Diapycnal and Isopycnal Mixing Experiment in the Southern Ocean (DIMES)

Coordinating body

National Oceanography Centre, Southampton/Woods Hole Oceanographic Institution

Cruise report

(6.08 MB)

Ocean/sea areas

General

South West Atlantic Ocean (limit 20W)

Specific

Drake Passage

Track charts

(0.06 MB)

Measurements

Physical oceanography

Surface measurements underway (T,S)

Quantity: track kilometres = 1930
Description: Thermosalinograph

CTD stations

Quantity: 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 buoys

Quantity: number of deployments = 13
Description: Surface drifters

Neutrally buoyant floats

Quantity: number of deployments = 6
Description: Neutrally buoyant RAFOS floats

Other physical oceanographic measurements

Quantity: number of profiles = 14
Description: Vertical temperature and velocity microstructure using Rockland Scientific VMP

Chemical oceanography

Carbon dioxide

Quantity: track kilometres = 1930
Description: Continuous underway surface pCO2

Alkalinity

Quantity: number of samples = 25
Description: Alkalinity/TCO2 samples for later analysis

Meteorology

Routine standard measurements

Quantity: track kilometres = 1930
Description: Meteorological package (barometer, wind speed, wind direction, humidity, TIR, PAR)

Data held at BODC

Get data

Series/Profiles

53 Acoustic doppler current profiler

Horizontal velocity of the water column (currents)
Reference numbers
Horizontal spatial co-ordinates
Date and time
Vertical spatial coordinates
Horizontal platform movement
Metadata parameters

[Show series]

Horizontal velocity of the water column (currents)
Reference numbers
Horizontal spatial co-ordinates
Date and time
Vertical spatial coordinates
Horizontal platform movement
Metadata parameters

[Hide series]

BODC id	Date/Time	Location
1717766	2011-04-14 08:26:34	59° 59' 59" S 78° 0' 0" W
1718026	2011-04-18 01:09:33	63° 19' 59" S 78° 0' 0" W
1718063	2011-04-18 11:27:39	63° 59' 56" S 77° 59' 58" W
1718155	2011-04-23 19:21:19	56° 46' 59" S 57° 13' 48" W
1813521	2011-04-11 15:44:18 — 2011-04-26 10:57:40	56° 29' 59" S 77° 59' 59" W — 56° 29' 59" S 77° 59' 59" W
1717729	2011-04-13 06:30:53	58° 59' 59" S 77° 59' 57" W
1717987	2011-04-17 08:12:02	62° 26' 39" S 77° 59' 59" W
1718075	2011-04-21 10:02:33	58° 59' 58" S 55° 51' 16" W
1718118	2011-04-22 11:40:39	57° 44' 0" S 56° 38' 25" W
1717674	2011-04-12 02:13:27	56° 54' 59" S 77° 59' 59" W
1717686	2011-04-12 07:37:22	57° 19' 59" S 77° 59' 59" W
1717742	2011-04-13 21:13	59° 36' 0" S 77° 59' 58" W
1717754	2011-04-14 04:31:38	59° 47' 59" S 77° 59' 59" W
1717822	2011-04-15 07:39:02	60° 35' 17" S 77° 59' 57" W
1717858	2011-04-15 16:08:13	60° 56' 27" S 77° 59' 58" W
1717895	2011-04-16 00:27:51	61° 17' 38" S 77° 59' 59" W
1718235	2011-04-25 14:39:14	55° 4' 1" S 57° 58' 24" W
1717810	2011-04-15 04:48:25	60° 28' 16" S 77° 59' 56" W
1717871	2011-04-15 18:54:10	61° 3' 30" S 77° 59' 57" W
1717914	2011-04-16 10:37:46	61° 31' 47" S 78° 0' 0" W
1717926	2011-04-16 13:26:25	61° 38' 49" S 78° 0' 1" W
1717999	2011-04-17 11:27:45	62° 39' 59" S 78° 0' 0" W
1718051	2011-04-18 07:28:15	63° 46' 39" S 77° 59' 59" W
1718087	2011-04-21 16:13	58° 41' 4" S 56° 3' 18" W
1718106	2011-04-22 05:40:46	58° 3' 1" S 56° 26' 45" W
1718223	2011-04-25 06:18:54	55° 8' 29" S 57° 59' 59" W
1717662	2011-04-11 15:49:19	56° 29' 59" S 77° 59' 59" W
1717717	2011-04-13 00:30:04	58° 34' 59" S 77° 59' 59" W
1717791	2011-04-14 15:21:14	60° 14' 6" S 78° 0' 0" W
1717951	2011-04-16 19:02:58	61° 52' 56" S 77° 59' 59" W
1717963	2011-04-16 21:34:31	62° 0' 0" S 78° 0' 1" W
1717975	2011-04-17 01:31:48	62° 13' 19" S 77° 59' 59" W
1718038	2011-04-18 04:22:01	63° 33' 19" S 78° 0' 1" W
1717698	2011-04-12 12:32:18	57° 44' 59" S 77° 59' 58" W
1717834	2011-04-15 10:35:04	60° 42' 21" S 78° 0' 4" W
1718014	2011-04-17 18:37:19	63° 6' 40" S 77° 59' 56" W
1718192	2011-04-24 17:06:27	55° 50' 0" S 57° 49' 14" W
1717730	2011-04-13 13:47:10	59° 12' 0" S 77° 59' 59" W
1717846	2011-04-15 13:20:31	60° 49' 25" S 78° 0' 7" W
1717902	2011-04-16 03:52:01	61° 24' 42" S 77° 59' 59" W
1717938	2011-04-16 16:16:38	61° 45' 52" S 77° 59' 58" W
1718143	2011-04-23 12:32:28	57° 6' 0" S 57° 2' 11" W
1718179	2011-04-24 07:08:55	56° 28' 2" S 57° 25' 29" W
1717705	2011-04-12 19:23:23	58° 9' 59" S 77° 59' 59" W
1717778	2011-04-14 11:37:27	60° 7' 3" S 77° 59' 59" W
1717809	2011-04-15 01:48:30	60° 21' 10" S 77° 59' 59" W
1717883	2011-04-15 21:41:05	61° 10' 34" S 78° 0' 0" W
1718002	2011-04-17 14:50:20	62° 53' 19" S 77° 59' 59" W
1718099	2011-04-21 22:18:32	58° 21' 56" S 56° 14' 37" W
1718131	2011-04-22 17:39:48	57° 24' 56" S 56° 50' 23" W
1718167	2011-04-24 03:20:24	56° 28' 3" S 57° 25' 30" W
1718180	2011-04-24 11:34:15	56° 8' 57" S 57° 37' 25" W
1718211	2011-04-25 00:47:55	55° 31' 9" S 58° 0' 53" W

53 CTD/STD cast

Reference numbers
Temperature of the water column
Vertical spatial coordinates
Salinity of the water column
Density of the water column

[Show series]

Reference numbers
Temperature of the water column
Vertical spatial coordinates
Salinity of the water column
Density of the water column

[Hide series]

BODC id	Date/Time	Location
1088839	2011-04-13 17:22:13 — 2011-04-13 18:12:30	59° 23' 59" S 77° 59' 59" W
1089020	2011-04-16 13:20:40 — 2011-04-16 14:02:33	61° 38' 49" S 77° 59' 59" W
1089093	2011-04-17 08:03:16 — 2011-04-17 08:47:19	62° 26' 39" S 77° 59' 59" W
1089197	2011-04-21 09:53:08 — 2011-04-21 11:07:08	59° 0' 1" S 55° 51' 21" W
1089345	2011-04-25 00:43:19 — 2011-04-25 01:59:34	55° 31' 8" S 58° 0' 53" W
1089394	2011-04-13 06:16:33 — 2011-04-13 07:54:28	58° 59' 59" S 77° 59' 57" W
1088956	2011-04-15 16:01 — 2011-04-15 16:44:40	60° 56' 27" S 77° 59' 58" W
1089032	2011-04-16 16:06:09 — 2011-04-16 16:52:20	61° 45' 53" S 77° 59' 58" W
1089333	2011-04-24 17:00:06 — 2011-04-24 18:27:49	55° 50' 28" S 57° 48' 31" W
1088852	2011-04-14 04:20:58 — 2011-04-14 05:14:57	59° 47' 59" S 77° 59' 59" W
1088944	2011-04-15 13:15:21 — 2011-04-15 13:56:14	60° 49' 24" S 77° 59' 59" W
1089056	2011-04-16 18:59:59 — 2011-04-16 19:38:31	61° 52' 56" S 77° 59' 58" W
1089289	2011-04-24 03:12:07 — 2011-04-24 04:28:39	56° 28' 4" S 57° 25' 29" W
1089321	2011-04-24 11:29:24 — 2011-04-24 12:36:40	56° 9' 15" S 57° 36' 16" W
1088864	2011-04-14 08:16:02 — 2011-04-14 09:09:38	59° 59' 59" S 77° 59' 59" W
1088932	2011-04-15 10:27:31 — 2011-04-15 11:10:12	60° 42' 21" S 78° 0' 0" W
1088981	2011-04-15 21:36:18 — 2011-04-15 22:15:41	61° 10' 35" S 77° 59' 59" W
1089007	2011-04-16 03:40:56 — 2011-04-16 05:17:04	61° 24' 42" S 77° 59' 59" W
1089290	2011-04-12 12:20:37 — 2011-04-12 13:48:36	57° 44' 59" S 77° 59' 58" W
1088827	2011-04-11 15:44:01 — 2011-04-11 17:05:45	56° 29' 59" S 77° 59' 59" W
1088840	2011-04-13 21:09:57 — 2011-04-13 21:55:59	59° 36' 0" S 77° 59' 58" W
1088968	2011-04-15 18:48:35 — 2011-04-15 19:30:26	61° 3' 31" S 77° 59' 58" W
1089081	2011-04-17 01:27:51 — 2011-04-17 02:55:09	62° 13' 19" S 78° 0' 0" W
1089124	2011-04-17 18:32:06 — 2011-04-17 19:58:44	63° 6' 39" S 78° 0' 0" W
1089173	2011-04-12 07:24:30 — 2011-04-12 08:20:04	57° 19' 59" S 77° 59' 59" W
1089204	2011-04-21 16:07:59 — 2011-04-21 17:18:13	58° 41' 4" S 56° 3' 18" W
1089216	2011-04-21 22:14:12 — 2011-04-21 23:24:34	58° 21' 37" S 56° 13' 45" W
1089241	2011-04-22 11:31:28 — 2011-04-22 12:40:41	57° 44' 0" S 56° 38' 25" W
1089382	2011-04-13 00:24:05 — 2011-04-13 01:13:38	58° 34' 58" S 77° 59' 52" W
1088919	2011-04-15 04:36:48 — 2011-04-15 05:22:53	60° 28' 14" S 77° 59' 57" W
1088920	2011-04-15 07:31:28 — 2011-04-15 08:14:39	60° 35' 17" S 77° 59' 51" W
1089044	2011-04-12 02:07:13 — 2011-04-12 02:56:14	56° 54' 59" S 77° 59' 59" W
1089277	2011-04-23 19:18:51 — 2011-04-23 20:20:46	56° 46' 56" S 57° 13' 44" W
1089308	2011-04-24 07:00:17 — 2011-04-24 07:48:24	56° 28' 2" S 57° 25' 29" W
1089357	2011-04-25 06:09:18 — 2011-04-25 07:09:45	55° 8' 30" S 57° 59' 59" W
1089369	2011-04-25 14:29:46 — 2011-04-25 15:17:08	55° 4' 1" S 57° 58' 25" W
1089370	2011-04-12 19:16:01 — 2011-04-12 20:07:03	58° 9' 59" S 78° 0' 0" W
1088888	2011-04-14 15:15:36 — 2011-04-14 16:44:38	60° 14' 6" S 78° 0' 0" W
1088907	2011-04-15 01:44:52 — 2011-04-15 02:23:44	60° 21' 10" S 77° 59' 59" W
1088993	2011-04-16 00:21:42 — 2011-04-16 01:03:13	61° 17' 38" S 78° 0' 0" W
1089019	2011-04-16 10:28:57 — 2011-04-16 11:12:50	61° 31' 46" S 78° 0' 0" W
1089068	2011-04-16 21:30:25 — 2011-04-16 22:16:26	61° 59' 59" S 78° 0' 0" W
1089100	2011-04-17 11:21:32 — 2011-04-17 12:03:27	62° 39' 59" S 78° 0' 0" W
1089112	2011-04-17 14:45:03 — 2011-04-17 15:25:59	62° 53' 19" S 77° 59' 59" W
1089148	2011-04-18 04:13:37 — 2011-04-18 04:57:20	63° 33' 19" S 77° 59' 59" W
1089161	2011-04-18 07:21:27 — 2011-04-18 08:03:03	63° 46' 39" S 78° 0' 0" W
1089228	2011-04-22 05:34:10 — 2011-04-22 06:47:44	58° 3' 1" S 56° 26' 45" W
1089253	2011-04-22 17:31:50 — 2011-04-22 18:40:01	57° 24' 56" S 56° 50' 23" W
1089265	2011-04-23 12:24:27 — 2011-04-23 13:49:41	57° 5' 40" S 57° 2' 3" W
1089401	2011-04-13 13:40:33 — 2011-04-13 14:31:33	59° 11' 59" S 78° 0' 0" W
1088876	2011-04-14 11:31:48 — 2011-04-14 12:21:19	60° 7' 3" S 77° 59' 59" W
1089136	2011-04-18 01:05:42 — 2011-04-18 01:45:26	63° 19' 59" S 78° 0' 0" W
1089185	2011-04-18 11:15:12 — 2011-04-18 12:39:53	63° 59' 59" S 77° 59' 59" W

13 Turbulence energy dissipation probe

Reference numbers
Turbulence in the water column
Vertical spatial coordinates
Salinity of the water column
Temperature of the water column

[Show series]

Reference numbers
Turbulence in the water column
Vertical spatial coordinates
Salinity of the water column
Temperature of the water column

[Hide series]

BODC id	Date/Time	Location
1716413	2011-04-23 19:06 — 2011-04-23 23:09	56° 46' 59" S 57° 13' 46" W
1716425	2011-04-24 03:06 — 2011-04-24 06:50	56° 28' 4" S 57° 25' 29" W
1716462	2011-04-14 15:01 — 2011-04-14 20:47	60° 14' 5" S 77° 59' 58" W
1716437	2011-04-24 16:52 — 2011-04-24 22:12	55° 50' 2" S 57° 44' 13" W
1716474	2011-04-16 03:37 — 2011-04-16 09:30	61° 24' 42" S 77° 59' 58" W
1716449	2011-04-25 06:02 — 2011-04-25 13:48	55° 8' 27" S 57° 59' 56" W
1716498	2011-04-17 18:19 — 2011-04-17 23:38	63° 6' 37" S 77° 59' 55" W
1716505	2011-04-18 11:15 — 2011-04-18 15:55	63° 59' 53" S 77° 59' 58" W
1716450	2011-04-13 06:09 — 2011-04-13 12:08	59° 0' 0" S 78° 0' 0" W
1716486	2011-04-17 01:07 — 2011-04-17 06:45	62° 13' 19" S 78° 0' 0" W
1716517	2011-04-21 09:47 — 2011-04-21 14:09	58° 59' 57" S 55° 51' 15" W
1716529	2011-04-21 21:59 — 2011-04-22 02:46	58° 21' 57" S 56° 14' 55" W
1716401	2011-04-22 17:26 — 2011-04-22 21:34	57° 24' 56" S 56° 50' 26" W

Discrete samples

53 CTD frame plus rosette sampler

Water body released tracers
Chlorofluorocarbon concentrations in the water column

78 Sample taken from ship's non-toxic supply

Salinity of the water column

Resources

RRS James Clark Ross JR20110409 (JR276, UKD-2.5)

Cruise summary report

Quick links

BODC holdings

EDMED