RRS James Clark Ross JR20111127 (JR254D, JR264, JR265)

Cruise summary report

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Cruise Info.

Ship name (ship code)

RRS James Clark Ross (74JC)

Cruise identifier

JR20111127 (JR254D, JR264, JR265)

Cruise period

2011-11-27 — 2011-12-24

Status

Completed

Port of departure

Stanley, Falkland Islands (Malvinas)

Port of return

Stanley, Falkland Islands (Malvinas)

Purpose

Research

Objectives

JR265: This cruise carried out the 17th complete occupation of the Drake Passage CTD section, established during the World Ocean Circulation Experiment as repeat section SR1b. It was first occupied by the National Oceanography Centre (previously IOSDL and then SOC) in collaboration with the British Antarctic Survey in 1993, and has been re-occupied most years since then. Thirty two full depth stations were performed during JR265: two test stations, and all 30 of the nominal stations for the SR1b Drake Passage section. The northern-most 9 stations have been shifted from their nominal positions to lie along 58˚W, as for JC031 (Feb-Mar 2009). An initial result is that the estimated total transport measured across the section was 133 Sv which compares well to an average transport measured from the 16 previous UK cruises of 135 Sv (standard deviation of 7 Sv).
This hydrographic cruise, was carried out in conjunction with both cruise JR245D, a "Waves Aerosol and Gas Exchange Study" (WAGES) intensive observation cruise, and cruise JR264, led by NOC-L staff.
The CTD was an underwater SBE 9 plus unit equipped with the following sensors: dual temperature and conductivity sensors, a pressure sensor encased in the SBE underwater unit, a SBE-43 oxygen probe, an Aquatracka MKIII fluorometer, a transmissometer, an upward- looking downwelling PAR sensor, and an altimeter. A downward-looking LADCP (RDI Workhorse Monitor 300 kHz) was deployed on all stations. Various underway measurements were obtained, including navigation, VM-ADCP, sea surface temperature and salinity, water depth and various meteorological parameters. A practical aim during this cruise was to update the detailed guides for each of the hydrographic data streams which were first written during JR195 in 2009. The hydrographic data analysis was performed using "MSTAR", a suite of Matlab programs developed at NOCS by Brian King and used on the JCR for the first time during JR195.

Chief scientist

Margaret J Yelland (National Oceanography Centre, Southampton), Miguel Angel Morales Maqueda (National Oceanography Centre, Liverpool)

Cruise report

(1.93 MB)

Ocean/sea areas

General

Southern Ocean

Specific

Drake Passage

Track charts

(0.04 MB)

Measurements

Physical oceanography

Surface measurements underway (T,S)

Quantity: activity duration in days = 11
Description: Underway salinity, temperature, transmittance and fluorescence from SurfMet system

Surface measurements underway (T,S)

Quantity: activity duration in days = 11
Description: Discrete salinity samples from underway supply, analysed using an Autosal salinometer. Used to calibrate underway salinity sensor in the OceanLogger system

Bathythermograph

Quantity: activity duration in days = 11
Description: Sea floor depth using a Kongsberg EA600 single beam and EM122 multi-beam echo sounders

Water bottle stations

Quantity: number of stations = 32
Description: Discrete salinity samples collected from CTD bottles: CTD frame fitted with SBE 32, 24-way carousel and 24 x 12 L niskin bottles. Samples analysed using an Autosal salinometer. Used to calibrate CTD salinity

CTD stations

Quantity: number of stations = 32
Description: Temperature, conductivity, pressure, transmittance, fluorescence, oxygen and back scatter using a SeaBird SBE 9 plus mounted on a stainless steel CTD frame. Station depths ranged from 1.7 - 5702 m

CTD stations

Quantity: number of stations = 32
Description: Sea water velocities using a RDI WH monitor 300 kHz lowered acoustic doppler current profiler (LADCP)

Subsurface temperature and salinity measurements

Quantity: activity duration in days = 11
Description: Sea floor depth using a Kongsberg EA600 single beam and EM122 multi-beam echo sounders

Subsurface temperature and salinity measurements

Quantity: activity duration in days = 11
Description: Water velocities using a 75 kHz RD Instruments OS75 vessel mounted acoustic doppler current profiler (VMADCP)

Transparency (eg transmissometer)

Quantity: activity duration in days = 11
Description: Underway salinity, temperature, transmittance and fluorescence from SurfMet system

Transparency (eg transmissometer)

Optics (eg underwater light levels)

Quantity: activity duration in days = 11
Description: Underway salinity, temperature, transmittance and fluorescence from SurfMet system

Current profiler (eg ADCP)

Quantity: number of stations = 32
Description: Sea water velocities using a RDI WH monitor 300 kHz lowered acoustic doppler current profiler (LADCP)

Current profiler (eg ADCP)

Quantity: activity duration in days = 11
Description: Water velocities using a 75 kHz RD Instruments OS75 vessel mounted acoustic doppler current profiler (VMADCP)

Meteorology

Routine standard measurements

Quantity: activity duration in days = 11
Description: Underway atmospheric pressure, air temperature, air humidity, total irradiance (TIR), photosynthetic radiation (PAR) from the OceanLogger system and wind speed and wind direction from the met system.

Moorings, landers, buoys

Physical oceanography

Neutrally buoyant floats

55° 9' 26" S 58° 0' 0" W — 29/11/11 14:20 GMT (CTD station 007). Deployed Met Office Argo float serial no 4900. Pressure, temperature and conductivity profiles over 5 - 2000 db

Neutrally buoyant floats

56° 8' 24" S 57° 34' 14" W — 2/12/11 02:33 GMT (CTD station 011). Deployed Met Office Argo float serial no 4901. Pressure, temperature and conductivity profiles over 5 - 2000 db

Neutrally buoyant floats

59° 59' 57" S 55° 14' 19" W — 4/12/11 10:51 GMT (CTD station 023). Deployed Met Office Argo float serial no 4998. Pressure, temperature and conductivity profiles over 5 - 2000 db

Neutrally buoyant floats

58° 3' 5" S 56° 26' 47" W — 3/12/11 07:13 GMT (CTD station 017). Deployed Met Office Argo float serial no 4903. Pressure, temperature and conductivity profiles over 5 - 2000 db

Neutrally buoyant floats

59° 0' 0" S 55° 51' 47" W — 3/12/11 21:09 GMT (CTD station 020). Deployed Met Office Argo float serial no 4999. Pressure, temperature and conductivity profiles over 5 - 2000 db

Neutrally buoyant floats

57° 5' 55" S 57° 0' 25" W — 2/12/11 16:26 GMT (CTD station 014). Deployed Met Office Argo float serial no 4902. Pressure, temperature and conductivity profiles over 5 - 2000 db

Data held at BODC

Get data

Series/Profiles

31 CTD/STD cast

Reference numbers
Transmittance and attenuance of the water column
Salinity of the water column
Temperature of the water column
Vertical spatial coordinates
Dissolved oxygen parameters in the water column
Density of the water column
Electrical conductivity of the water column
Chlorophyll pigment concentrations in water bodies

[Show series]

[Hide series]

BODC id	Date/Time	Location
1363548	2011-11-29 03:33:51 — 2011-11-29 03:59:41	54° 59' 56" S 57° 59' 49" W
1363770	2011-12-04 14:26:36 — 2011-12-04 15:24:20	60° 19' 59" S 55° 1' 53" W
1363837	2011-12-05 15:27:45 — 2011-12-05 15:34:48	61° 3' 0" S 54° 35' 13" W
1363561	2011-11-29 05:11:15 — 2011-11-29 05:47:25	55° 2' 21" S 57° 59' 53" W
1363604	2011-11-29 21:38:49 — 2011-11-29 22:49:09	55° 31' 19" S 58° 1' 13" W
1363677	2011-12-02 20:45:52 — 2011-12-02 21:47:12	57° 24' 57" S 56° 49' 34" W
1363769	2011-12-04 09:37:26 — 2011-12-04 10:37:09	59° 59' 58" S 55° 14' 17" W
1363794	2011-12-04 22:00:52 — 2011-12-04 22:44:05	60° 47' 58" S 54° 44' 35" W
1363512	2011-11-28 21:55:48 — 2011-11-28 22:01:15	54° 47' 21" S 57° 59' 44" W
1363708	2011-12-03 10:39:11 — 2011-12-03 11:44:01	58° 22' 0" S 56° 15' 1" W
1363745	2011-12-04 00:37:31 — 2011-12-04 01:41:02	59° 19' 59" S 55° 39' 3" W
1363813	2011-12-05 03:43:11 — 2011-12-05 04:01:10	60° 51' 1" S 54° 42' 39" W
1363597	2011-11-29 16:43:08 — 2011-11-29 17:44:49	55° 11' 58" S 57° 59' 24" W
1363585	2011-11-29 13:49:34 — 2011-11-29 14:41:47	55° 9' 26" S 58° 0' 3" W
1363665	2011-12-02 15:20:29 — 2011-12-02 16:27:32	57° 6' 2" S 57° 1' 14" W
1363733	2011-12-03 19:58:43 — 2011-12-03 21:01:14	59° 0' 0" S 55° 51' 28" W
1363536	2011-11-29 01:39:11 — 2011-11-29 01:59:04	54° 58' 48" S 57° 58' 30" W
1363616	2011-12-01 18:44:05 — 2011-12-01 20:11:08	55° 49' 55" S 57° 48' 42" W
1363689	2011-12-03 01:19:22 — 2011-12-03 02:18:21	57° 43' 59" S 56° 38' 34" W
1363757	2011-12-04 05:07:18 — 2011-12-04 06:09:42	59° 40' 0" S 55° 26' 39" W
1363782	2011-12-04 18:56:49 — 2011-12-04 19:48:01	60° 39' 49" S 54° 48' 18" W
1363524	2011-11-28 23:21:08 — 2011-11-28 23:32:31	54° 54' 33" S 57° 59' 37" W
1363573	2011-11-29 11:04:44 — 2011-11-29 11:48:52	55° 5' 40" S 57° 59' 57" W
1363628	2011-12-02 01:09:28 — 2011-12-02 02:10:16	56° 8' 42" S 57° 35' 44" W
1363641	2011-12-02 05:51:19 — 2011-12-02 06:52:47	56° 27' 55" S 57° 25' 7" W
1363721	2011-12-03 15:16:56 — 2011-12-03 16:20:15	58° 41' 1" S 56° 3' 14" W
1363801	2011-12-05 01:44:11 — 2011-12-05 02:33:44	60° 49' 59" S 54° 43' 18" W
1363825	2011-12-05 14:10:44 — 2011-12-05 14:22:13	60° 58' 51" S 54° 37' 48" W
1363653	2011-12-02 10:42:16 — 2011-12-02 11:43:32	56° 47' 3" S 57° 13' 6" W
1363690	2011-12-03 05:54:23 — 2011-12-03 07:01:36	58° 3' 3" S 56° 26' 45" W
1363850	2011-11-28 12:33:20 — 2011-11-28 13:14:05	53° 27' 41" S 57° 56' 47" W

Discrete samples

31 CTD frame plus rosette sampler

Salinity of the water column

38 Sample taken from ship's non-toxic supply

Salinity of the water column

Resources

RRS James Clark Ross JR20111127 (JR254D, JR264, JR265)

Cruise summary report

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BODC holdings

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