RRS James Clark Ross JR20030218 (JR84)

Cruise summary report

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Cruise Info.

Ship name (ship code)

RRS James Clark Ross (74JC)

Cruise identifier

JR20030218 (JR84)

Cruise period

2003-02-28 — 2003-04-04

Status

Completed

Port of departure

Stanley, Falkland Islands (Malvinas)

Port of return

Stanley, Falkland Islands (Malvinas)

Purpose

Research

Objectives

This cruise was the first phase of the NERC Autosub Under Ice thematic programme. It's aims were to investigate the physical oceanographic and marine geological setting of Pine Island Glacier, which extends an 80 km floating ice tongue into the eastern Amundsen Sea, West Antarctica. Specifically the goals were to understand the imprint left by the glacier on the seabed at times when it extended further over the continental shelf, and the role played by the ocean in determining the current mass balance of the glacier. Ship-based observations of the sea floor and water column in front of the glacier were to be supplemented with data from beneath it, obtained using the NERC autonomous submersible, Autosub. The sea ice conditions that were encountered in the eastern Amundsen Sea prevented access to the Glacier, so the study was shifted to the continental shelf edge. There the work focused on the record of the last glacial advance to the shelf break, and the processes by which warm deep water from off the shelf penetrates onto the shelf, where it supplies the heat that melts the floating ice cover. Of major interest to both these investigations was a seabed trough that cut the shelf edge near S71.5deg, W113-114deg. Autosub missions were run beneath multi-year sea ice to measure the ice thickness distribution and the properties of the water column beneath. Swath mapping of the sea floor was undertaken throughout the cruise, including the transit legs between the main work area and the Falkland Islands.

Chief scientist

Adrian Jenkins (British Antarctic Survey)

Cruise report

(7.95 MB)

Ocean/sea areas

General

South Pacific Ocean

Specific

Amundsen and Bellingshausen seas in the Pacific sector of the Southern Ocean

Track charts

(1.16 MB)

(0.17 MB)

Measurements

Physical oceanography

Surface measurements underway (T,S)

Quantity: activity duration in days = 36
Description: Continuous records from ship-mounted thermosalinograph and fluorometer

Bathythermograph

Quantity: number of stations = 36
Description: Expendable bathythermographs (22 x T5 + 14 x T7) for sound velocity profiles

Water bottle stations

Quantity: number of stations = 44
Description: Salinity (for CTD calibration) plus samples for later oxygen 18, radon and micro-biological analysis from selected stations; maximum of 12 sampling levels

CTD stations

Quantity: number of stations = 44
Description: Pressure, duplicate temperature, duplicate conductivity, duplicate dissolved oxygen and fluorometer records; vertical profiles using Seabird SBE 911+ system

Subsurface temperature and salinity measurements

Quantity: number of dives = 18
Description: Underway records from pressure, duplicate temperature, duplicate conductivity and dissolved oxygen sensors (fluorometer and transmissometer data also on first 13 missions); Seabird SBE 9+ mounted on Autosub

Current profiler (eg ADCP)

Quantity: number of dives = 18
Description: Underway records from RDI 150 and 300 kHz instruments mounted on Autosub

Current profiler (eg ADCP)

Quantity: activity duration in days = 36
Description: Continuous record from hull-mounted RDI 150 kHz ADCP

Other physical oceanographic measurements

Quantity: activity duration in days = 12
Description: Underway sea ice observations (ice type, floe size, thickness of ice and snow)

Other physical oceanographic measurements

Quantity: number of stations = 3
Description: In situ sea ice observations (snow and ice thickness measurements)

Other physical oceanographic measurements

Quantity: number of samples = 32
Description: Discrete water samples collected by Aqualab sampler mounted on Autosub; analysed for salinity

Meteorology

Routine standard measurements

Quantity: activity duration in days = 36
Description: Continuous records from ship-mounted instruments (duplicate air pressure, temperature, humidity, TIR and PAR; plus wind speed and direction)

Geology and geophysics

Single-beam echosounding

Description: Continuous record from Simrad EA500

Multi-beam echosounding

Quantity: activity duration in days = 34
Description: Continuous record from Simrad EM120

Multi-beam echosounding

Quantity: number of dives = 18
Description: Underway records from Simrad EM2000 multi-beam echo-sounder mounted on Autosub

Magnetic measurements

Quantity: activity duration in days = 12
Description: Underway recording with towed magnetometer during transit legs

Other geological/geophysical measurements

Quantity: number of dives = 12
Description: Underway records from Edgetech FS-AU sub-bottom profiler mounted on Autosub

Other geological/geophysical measurements

Quantity: activity duration in days = 34
Description: Continuous record from TOPAS sub-bottom profiler

Moorings, landers, buoys

Meteorology

Routine standard measurements

70° 50' 59" S 102° 0' 0" W — Sea ice drifter with air pressure/ temperature sensors; Argos buoy 8059.

Routine standard measurements

70° 58' 59" S 101° 10' 0" W — Sea ice drifter with air pressure/ temperature sensors; Argos buoy 8064.

Routine standard measurements

70° 52' 59" S 102° 20' 59" W — Sea ice drifter with air pressure/ temperature sensors; Argos buoy 8058.

Data held at BODC

Get data

Series/Profiles

64 Acoustic doppler current profiler

Horizontal spatial co-ordinates
Date and time
Vertical spatial coordinates
Vertical velocity of the water column (currents)
Acoustic backscatter in the water column
Horizontal velocity of the water column (currents)
Metadata parameters

[Show series]

[Hide series]

BODC id	Date/Time	Location
647437	2003-03-02 00:00:36 — 2003-03-02 11:58:39	58° 56' 30" S 62° 34' 58" W — 56° 45' 24" S 61° 23' 0" W
647474	2003-03-04 00:00:13 — 2003-03-04 11:58:11	64° 36' 42" S 62° 39' 7" W — 64° 12' 4" S 61° 41' 26" W
647554	2003-03-08 00:00:26 — 2003-03-08 11:58:27	70° 32' 47" S 101° 56' 6" W — 69° 53' 41" S 96° 23' 18" W
647658	2003-03-12 12:01:33 — 2003-03-12 23:59:31	72° 54' 34" S 111° 54' 7" W — 72° 11' 22" S 108° 12' 41" W
647787	2003-03-18 00:01:15 — 2003-03-18 11:59:14	71° 39' 46" S 114° 0' 4" W — 71° 17' 8" S 113° 21' 43" W
647806	2003-03-19 00:01:16 — 2003-03-19 11:59:52	71° 30' 24" S 113° 35' 33" W — 71° 22' 38" S 112° 42' 52" W
647959	2003-03-25 12:02:18 — 2003-03-26 00:00:20	70° 32' 23" S 98° 31' 18" W — 70° 23' 13" S 98° 15' 49" W
647960	2003-03-26 00:02:19 — 2003-03-26 12:00:23	70° 28' 37" S 98° 31' 2" W — 70° 3' 21" S 96° 17' 55" W
647984	2003-03-27 00:02:22 — 2003-03-27 12:00:29	69° 9' 35" S 90° 54' 55" W — 68° 31' 37" S 88° 14' 50" W
647996	2003-03-27 12:02:29 — 2003-03-28 00:00:28	68° 43' 35" S 88° 13' 37" W — 68° 12' 17" S 81° 7' 4" W
647542	2003-03-07 12:00:24 — 2003-03-07 23:58:26	69° 53' 33" S 96° 22' 11" W — 68° 59' 16" S 90° 14' 40" W
647566	2003-03-08 12:00:29 — 2003-03-08 23:58:31	70° 58' 48" S 102° 9' 17" W — 70° 27' 20" S 101° 9' 16" W
647609	2003-03-10 00:00:34 — 2003-03-10 11:58:36	70° 33' 7" S 102° 16' 47" W — 70° 21' 43" S 100° 30' 7" W
647646	2003-03-11 23:59:51 — 2003-03-12 11:59:29	72° 11' 2" S 112° 49' 21" W — 71° 29' 26" S 110° 37' 1" W
647683	2003-03-13 12:01:17 — 2003-03-13 23:59:20	71° 4' 7" S 109° 14' 55" W — 70° 53' 24" S 108° 36' 49" W
647726	2003-03-15 12:01 — 2003-03-15 23:59:03	71° 10' 54" S 111° 30' 0" W — 70° 46' 50" S 110° 13' 37" W
647867	2003-03-21 12:02 — 2003-03-22 00:00:03	71° 21' 51" S 113° 51' 47" W — 71° 7' 30" S 109° 30' 56" W
647702	2003-03-14 12:01:02 — 2003-03-14 23:58:32	71° 9' 51" S 108° 58' 51" W — 70° 48' 34" S 106° 11' 51" W
648023	2003-03-28 12:02:31 — 2003-03-28 23:59:44	67° 46' 59" S 75° 38' 7" W — 67° 40' 2" S 69° 10' 45" W
647972	2003-03-26 12:02:25 — 2003-03-27 00:00:23	70° 3' 11" S 96° 16' 54" W — 69° 9' 47" S 90° 55' 56" W
648060	2003-03-31 15:43:27 — 2003-03-31 23:58:25	67° 49' 54" S 69° 27' 15" W — 66° 49' 1" S 68° 8' 54" W
647935	2003-03-24 12:02:16 — 2003-03-25 00:00:16	70° 36' 10" S 100° 46' 29" W — 70° 20' 58" S 100° 36' 52" W
647892	2003-03-23 00:02:09 — 2003-03-23 12:00:11	70° 46' 19" S 105° 52' 52" W — 70° 14' 19" S 102° 37' 12" W
647413	2003-02-28 23:59:57 — 2003-03-01 11:56:52	54° 53' 33" S 59° 53' 22" W — 53° 1' 26" S 58° 39' 27" W
647462	2003-03-03 12:00:29 — 2003-03-03 23:58:13	64° 36' 56" S 62° 57' 41" W — 64° 19' 45" S 62° 24' 34" W
647855	2003-03-21 00:02 — 2003-03-21 12:00	71° 52' 16" S 114° 29' 27" W — 71° 6' 43" S 113° 11' 49" W
648084	2003-04-01 11:58:58 — 2003-04-01 23:57:31	65° 19' 58" S 65° 37' 39" W — 63° 45' 21" S 61° 20' 3" W
647530	2003-03-07 00:00:21 — 2003-03-07 11:58:24	68° 59' 8" S 90° 13' 40" W — 68° 5' 45" S 84° 14' 52" W
647671	2003-03-13 00:01:30 — 2003-03-13 11:59:17	72° 16' 1" S 108° 51' 53" W — 71° 2' 34" S 108° 2' 17" W
647880	2003-03-22 12:02:05 — 2003-03-23 00:00:09	70° 58' 45" S 106° 7' 27" W — 70° 46' 37" S 105° 43' 17" W
648035	2003-03-29 00:01:45 — 2003-03-29 12:00:13	68° 10' 5" S 69° 10' 7" W — 67° 44' 10" S 67° 27' 49" W
647529	2003-03-06 12:00:19 — 2003-03-06 23:58:21	68° 5' 35" S 84° 13' 50" W — 67° 12' 49" S 78° 27' 44" W
647401	2003-02-28 11:59:02 — 2003-02-28 23:57:56	53° 1' 13" S 58° 39' 13" W — 51° 39' 33" S 57° 37' 11" W
647425	2003-03-01 12:00:33 — 2003-03-01 23:58:36	56° 45' 6" S 61° 22' 45" W — 54° 54' 10" S 59° 53' 49" W
647505	2003-03-05 12:00:28 — 2003-03-05 23:58:17	66° 22' 59" S 73° 21' 21" W — 65° 30' 0" S 68° 1' 34" W
647714	2003-03-15 00:00:32 — 2003-03-15 11:59	71° 14' 30" S 110° 26' 44" W — 70° 52' 11" S 106° 44' 36" W
647879	2003-03-22 00:02:03 — 2003-03-22 12:00:05	71° 11' 10" S 109° 29' 47" W — 70° 39' 13" S 105° 44' 53" W
647486	2003-03-04 12:00:13 — 2003-03-04 23:58:15	64° 43' 5" S 63° 13' 32" W — 64° 19' 14" S 61° 41' 55" W
647498	2003-03-05 00:00:17 — 2003-03-05 11:58:28	65° 29' 52" S 68° 0' 43" W — 64° 43' 11" S 63° 14' 13" W
647578	2003-03-09 00:00:30 — 2003-03-09 11:58:33	70° 58' 50" S 103° 12' 10" W — 70° 22' 6" S 101° 9' 27" W
647622	2003-03-11 00:00:39 — 2003-03-11 11:58:42	70° 41' 21" S 105° 45' 36" W — 70° 15' 31" S 100° 34' 46" W
647799	2003-03-18 12:01:16 — 2003-03-18 23:59:16	71° 38' 22" S 113° 24' 56" W — 71° 21' 54" S 112° 41' 40" W
647818	2003-03-19 12:01:55 — 2003-03-19 23:59:54	71° 29' 36" S 113° 51' 2" W — 71° 13' 23" S 113° 2' 19" W
647947	2003-03-25 00:02:19 — 2003-03-25 12:00:18	70° 33' 6" S 100° 43' 20" W — 70° 11' 26" S 98° 13' 40" W
648047	2003-03-29 12:02:16 — 2003-03-30 00:00:06	68° 15' 3" S 68° 9' 15" W — 67° 34' 25" S 67° 19' 11" W
647591	2003-03-09 12:00:32 — 2003-03-09 23:58:34	70° 53' 1" S 102° 29' 25" W — 70° 22' 6" S 101° 59' 35" W
647610	2003-03-10 12:00:36 — 2003-03-10 23:58:39	70° 29' 57" S 100° 48' 26" W — 70° 24' 20" S 100° 29' 37" W
647738	2003-03-16 00:01:03 — 2003-03-16 11:58:48	71° 23' 22" S 113° 20' 49" W — 70° 57' 29" S 111° 30' 47" W
647775	2003-03-17 12:02:28 — 2003-03-17 23:59:13	71° 33' 2" S 114° 0' 19" W — 71° 16' 55" S 112° 38' 44" W
647763	2003-03-17 00:00:10 — 2003-03-17 11:59:26	71° 43' 55" S 114° 17' 30" W — 71° 33' 2" S 112° 53' 56" W
647923	2003-03-24 00:02:13 — 2003-03-24 12:00:16	70° 28' 37" S 102° 31' 35" W — 70° 7' 32" S 100° 36' 43" W
647843	2003-03-20 12:01:56 — 2003-03-21 00:00	71° 55' 31" S 114° 33' 21" W — 71° 23' 44" S 114° 13' 22" W
648072	2003-04-01 00:00:26 — 2003-04-01 11:56:56	66° 48' 47" S 69° 0' 30" W — 65° 15' 12" S 65° 38' 44" W
647394	2003-02-28 00:00:31 — 2003-02-28 11:57:02	51° 41' 30" S 57° 49' 22" W — 51° 41' 17" S 57° 49' 9" W
647911	2003-03-23 12:02:10 — 2003-03-24 00:00:11	70° 39' 23" S 102° 40' 28" W — 70° 23' 30" S 102° 31' 31" W
648011	2003-03-28 00:02:30 — 2003-03-28 12:00:32	68° 12' 10" S 81° 5' 52" W — 67° 42' 20" S 75° 39' 16" W
647449	2003-03-02 12:00:39 — 2003-03-02 23:58:43	61° 44' 2" S 62° 48' 56" W — 58° 56' 57" S 62° 34' 59" W
647450	2003-03-03 00:00:43 — 2003-03-03 11:58:28	64° 19' 19" S 63° 0' 53" W — 61° 44' 30" S 62° 47' 1" W
647517	2003-03-06 00:00:17 — 2003-03-06 11:58:20	67° 12' 39" S 78° 26' 47" W — 66° 23' 7" S 73° 22' 9" W
647634	2003-03-11 12:00:42 — 2003-03-11 23:57:51	71° 29' 7" S 110° 42' 9" W — 70° 36' 52" S 105° 46' 53" W
647695	2003-03-14 00:01:20 — 2003-03-14 11:59:02	71° 15' 59" S 109° 15' 0" W — 71° 0' 10" S 108° 55' 25" W
647751	2003-03-16 12:00:49 — 2003-03-16 23:58:11	71° 35' 18" S 113° 30' 7" W — 71° 12' 22" S 112° 46' 11" W
647831	2003-03-20 00:01:54 — 2003-03-20 11:59:56	71° 33' 6" S 115° 6' 0" W — 71° 16' 44" S 113° 2' 19" W
648059	2003-03-30 00:02:06 — 2003-03-30 11:22:08	67° 48' 55" S 68° 11' 55" W — 67° 34' 19" S 67° 55' 0" W

36 Bathythermograph (MBT/XBT)

Reference numbers
Sound velocity and travel time in the water column
Vertical spatial coordinates
Temperature of the water column

[Show series]

Reference numbers
Sound velocity and travel time in the water column
Vertical spatial coordinates
Temperature of the water column

[Hide series]

BODC id	Date/Time	Location
963662	2003-03-03 07:12	63° 15' 6" S 62° 58' 1" W
963698	2003-03-05 17:04	65° 52' 28" S 70° 15' 8" W
963717	2003-03-06 08:20	66° 55' 15" S 76° 45' 21" W
963729	2003-03-06 13:19	67° 18' 18" S 79° 5' 19" W
963822	2003-03-14 19:34	70° 49' 26" S 106° 54' 8" W
963834	2003-03-16 00:36	71° 0' 29" S 111° 43' 45" W
963883	2003-03-17 07:09	71° 42' 43" S 113° 39' 16" W
963705	2003-03-05 21:03	66° 10' 8" S 72° 4' 26" W
963778	2003-03-11 20:07	71° 14' 50" S 109° 15' 48" W
963810	2003-03-13 11:34	71° 2' 38" S 108° 28' 49" W
963846	2003-03-16 00:39	71° 0' 38" S 111° 44' 23" W
963686	2003-03-04 03:08	64° 13' 19" S 61° 49' 51" W
963809	2003-03-12 20:04	72° 46' 17" S 109° 25' 6" W
963914	2003-03-20 06:30	71° 28' 14" S 114° 48' 44" W
963926	2003-03-21 07:53	71° 20' 11" S 114° 5' 46" W
964038	2003-03-02 16:02	59° 53' 54" S 62° 38' 31" W
964026	2003-03-02 07:01	57° 52' 30" S 62° 29' 4" W
964014	2003-03-01 22:14	56° 29' 45" S 61° 10' 12" W
963791	2003-03-12 04:09	72° 4' 1" S 111° 3' 23" W
963963	2003-03-25 09:59	70° 11' 59" S 98° 21' 47" W
963730	2003-03-06 19:11	67° 43' 11" S 81° 53' 26" W
963766	2003-03-11 04:34	70° 15' 35" S 101° 54' 7" W
963975	2003-03-27 17:37	68° 33' 58" S 84° 53' 8" W
964002	2003-03-01 14:42	55° 19' 45" S 60° 13' 57" W
964051	2003-03-02 22:08	61° 19' 32" S 62° 45' 39" W
963938	2003-03-23 00:23	70° 43' 36" S 105° 51' 31" W
963895	2003-03-18 08:55	71° 31' 33" S 113° 21' 45" W
963858	2003-03-17 00:03	71° 35' 50" S 113° 28' 9" W
963871	2003-03-17 07:02	71° 42' 42" S 113° 41' 35" W
963742	2003-03-07 09:44	68° 49' 19" S 89° 11' 44" W
963674	2003-03-03 16:11	64° 35' 11" S 62° 34' 5" W
963987	2003-03-27 17:43	68° 33' 53" S 84° 51' 13" W
963999	2003-03-28 16:15	67° 40' 46" S 73° 7' 11" W
963754	2003-03-08 06:06	70° 14' 47" S 99° 40' 4" W
963902	2003-03-19 00:37	71° 30' 24" S 112° 49' 21" W
963951	2003-03-23 00:36	70° 42' 38" S 105° 50' 51" W

3 CTD in towed or autonomous underwater vehicle

Reference numbers
Horizontal spatial co-ordinates
Date and time
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

[Show series]

[Hide series]

BODC id	Date/Time	Location
667739	2003-03-24 16:31:48 — 2003-03-25 01:28:32	70° 32' 7" S 100° 42' 24" W — 70° 30' 30" S 100° 43' 6" W
667740	2003-03-25 15:17:12 — 2003-03-26 05:12:40	70° 32' 3" S 98° 30' 18" W — 70° 22' 48" S 98° 16' 57" W
667727	2003-03-23 18:00:19 — 2003-03-24 02:14:25	70° 31' 1" S 102° 33' 27" W — 70° 21' 8" S 102° 23' 27" W

43 CTD/STD cast

Reference numbers
Vertical spatial coordinates
Dissolved oxygen parameters in the water column
Salinity of the water column
Temperature of the water column
Raw oxygen sensor output
Electrical conductivity of the water column
Chlorophyll pigment concentrations in water bodies

[Show series]

[Hide series]

BODC id	Date/Time	Location
861758	2003-03-18 07:00	71° 27' 26" S 113° 32' 12" W
861826	2003-03-19 22:02	71° 25' 38" S 113° 12' 40" W
861887	2003-03-20 16:00	71° 29' 53" S 114° 32' 39" W
861899	2003-03-20 17:36	71° 32' 49" S 114° 17' 7" W
861943	2003-03-25 19:09	70° 28' 7" S 98° 28' 31" W
861955	2003-03-04 13:40	64° 29' 21" S 62° 5' 44" W
861691	2003-03-17 10:35	71° 34' 43" S 113° 7' 36" W
861771	2003-03-18 08:35	71° 31' 32" S 113° 22' 3" W
861795	2003-03-19 16:54	71° 20' 23" S 113° 28' 37" W
861851	2003-03-20 09:35	71° 18' 52" S 114° 44' 17" W
861931	2003-03-24 20:02	70° 32' 7" S 100° 42' 56" W
861666	2003-03-17 07:36	71° 41' 13" S 113° 31' 23" W
861654	2003-03-17 06:02	71° 42' 26" S 113° 47' 16" W
861630	2003-03-17 02:28	71° 43' 55" S 114° 16' 31" W
861709	2003-03-17 12:01	71° 33' 2" S 112° 53' 55" W
861746	2003-03-18 05:21	71° 25' 19" S 113° 38' 4" W
861783	2003-03-19 14:33	71° 14' 52" S 113° 40' 42" W
861838	2003-03-19 23:35	71° 29' 36" S 113° 2' 20" W
861642	2003-03-17 04:04	71° 42' 45" S 114° 2' 40" W
861734	2003-03-18 03:18	71° 22' 34" S 113° 47' 3" W
861875	2003-03-20 14:15	71° 28' 25" S 114° 29' 14" W
861513	2003-03-13 20:14	71° 2' 59" S 108° 56' 3" W
861617	2003-03-16 11:05	71° 22' 34" S 112° 55' 56" W
861549	2003-03-14 08:26	71° 10' 53" S 108° 55' 26" W
861863	2003-03-20 12:25	71° 25' 48" S 114° 29' 53" W
861802	2003-03-19 18:36	71° 23' 35" S 113° 21' 3" W
861967	2003-03-08 14:18	70° 27' 29" S 102° 9' 8" W
861562	2003-03-15 12:55	71° 7' 19" S 110° 19' 43" W
861605	2003-03-16 09:34	71° 21' 10" S 112° 59' 58" W
861678	2003-03-17 09:07	71° 37' 55" S 113° 19' 31" W
861918	2003-03-23 20:45	70° 39' 17" S 102° 38' 10" W
861537	2003-03-14 07:01	71° 8' 53" S 108° 55' 29" W
861722	2003-03-17 17:34	71° 17' 27" S 113° 59' 55" W
861814	2003-03-19 20:37	71° 24' 36" S 113° 15' 56" W
861906	2003-03-21 12:29	71° 7' 45" S 113° 26' 28" W
861979	2003-03-10 15:16	70° 29' 28" S 100° 30' 56" W
861525	2003-03-14 05:14	71° 6' 47" S 108° 56' 12" W
861550	2003-03-14 09:59	71° 15' 59" S 108° 55' 42" W
861574	2003-03-15 15:05	71° 9' 56" S 110° 13' 52" W
861586	2003-03-16 05:10	71° 13' 23" S 113° 20' 44" W
861598	2003-03-16 07:46	71° 18' 35" S 113° 6' 58" W
861629	2003-03-16 12:34	71° 26' 27" S 112° 46' 14" W
861710	2003-03-17 13:32	71° 31' 7" S 112° 39' 1" W

Discrete samples

44 CTD frame plus rosette sampler

Salinity of the water column

36 Expendable Bathythermograph

Resources

RRS James Clark Ross JR20030218 (JR84)

Cruise summary report

Quick links

BODC holdings

EDMED