RRS James Clark Ross JR18005

Cruise summary report

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Cruise Info.

Ship name (ship code)

RRS James Clark Ross (74JC)

Cruise identifier

JR18005

Cruise period

2019-02-21 — 2019-04-15

Status

Completed

Port of departure

Punta Arenas, Chile

Port of return

Mare Harbour, Falkland Islands (Malvinas)

Purpose

Research

Objectives

JR18005 (ANDREXII) was a hydrographic and biogeochemical voyage aboard the Royal Research Ship James Clark Ross occupying ~100 full depth CTD stations extending from the tip of the Antarctic Peninsula to 30oE. ANDREXII repeated the track of two earlier voyages in 2009/10 and forms part of the ORCHESTRA (Ocean Regulation of Climate by Heat and Carbon Sequestration and Transports) multi-centre collaboration by NERC examining heat and carbon uptake in the South Atlantic and Southern Ocean. In addition CFC/SF6 measurements were taken for the TICTOC (Transient tracer-based Investigation of Circulation and Thermal Ocean Change) NERC large grant in partnership with ORCHESTRA. The voyage departed Punta Arenas on the 21st of February 2019 and was overflown twice by the BAS MASIN meteorological aircraft on the 23rd of February in order to conduct calibration measurements.
The JCR then called at Stanley on the 24th for half a day to transfer cargo before heading south to the tip of the Antarctic Peninsula. CTD operations commenced on the 28th of February and continued uninterrupted towards the east until the 10th of March. At this point the JCR diverted north over the South Sandwich Trench to conduct swathing operations and a CTD section across the 'shallow' sills revealed by the survey. Further deep stations in the trench were postponed until the end of the voyage due to concerns about the impact of extreme depth on the conducting wire. From the 13th of March the JCR returned to the ANDREXII hydrographic line. CTDs 73-78 were not successfully occupied on the eastward leg due to a technical fault with the CTD wire. This was rectified and CTDs 78-92 were occupied without break between 18th-23rd March. Poor weather along the planned stations between station 93 and 30oE forced the diversion of the line southwards, eventually reaching 30oE at 60.5oS on the 28th of March. Three stations were occupied on 30oE to intersect with the I6S line being occupied by US partners in April 2019 for calibration purposes.
The JCR then returned west to the missed stations 78-73 and reoccupied them (dropping 74 due to time constraints). A winch failure immediately upon completing the missed stations forced suspension of deep CTD operations and the cancellation of the planned extremely deep stations in the South Sandwich Trench. The JCR then proceeded east, recovering a BAS Slocum glider, deployed on JR18004, on the 9th of April. Finally the voyage occupied a single shallow CTD station within the growing sea-ice south-west of the South Orkney Islands on the 11th of April to examine air-sea fluxes before arriving at Mare Harbour on the 15th of April.

Chief scientist

Andrew J S Meijers (British Antarctic Survey)

Project

Ocean Regulation of Climate by Heat and Carbon Sequestration and Transports (ORCHESTRA)

Cruise report

(7.58 MB)

Ocean/sea areas

General

Southern Ocean
Unknown

Specific

South Scotia Sea, South Scotia Ridge, South Sandwich Trench, northern Weddell Sea.

Track charts

(0.26 MB)

Measurements

Physical oceanography

Surface measurements underway (T,S)

Quantity: track kilometres = 14800
Description: Continous underway water sampling (+ salinity bottle samples, every ~4 hours when underway).

Water bottle stations

Quantity: number of stations = 99
Description: CTD casts. Continuous recordings conductivity, temperature, depth, fluorescence, PAR, transmittance.

CTD stations

Quantity: number of stations = 99
Description: CTD casts. Continuous recordings conductivity, temperature, depth, fluorescence, PAR, transmittance.

Subsurface temperature and salinity measurements

Quantity: number of stations = 6
Description: CTD water analysis - calibration measurements of soccom float pH/TA, POC/HPLC

Current profiler (eg ADCP)

Quantity: number of stations = 98
Description: Lowered Acoustic Doppler Current Profiler mounted on CTD frame.

Current profiler (eg ADCP)

Quantity: track kilometres = 14800
Description: Ship mounted Acoustic Doppler Current Profiler measurements (75 kHz)

Chemical oceanography

Oxygen

Quantity: number of stations = 6
Description: CTD water analysis - calibration measurements of soccom float pH/TA, POC/HPLC

Oxygen

Quantity: number of stations = 98
Description: CTD water analysis- dissolved oxygen bottle samples

Carbon dioxide

Quantity: track kilometres = 14800
Description: Underway CO2 from atmosphere

Carbon dioxide

Quantity: track kilometres = 14800
Description: Underway pCO2 from seawater, using 'fast CO2' method

Carbon dioxide

Quantity: number of stations = 98
Description: CTD water analysis - DIC and pH

Carbon dioxide

Quantity: track kilometres = 14800
Description: Underway pCO2 from seawter, using standard 'showerhead' method.

Phosphate

Quantity: number of samples = 60
Description: Nutrients and Nutrient isotope from underway seawater. d13C, d15N and d30Si

Phosphate

Quantity: number of stations = 99
Description: Nutrients sampled from CTD bottles

Nitrate

Quantity: number of samples = 60
Description: Nutrients and Nutrient isotope from underway seawater. d13C, d15N and d30Si

Nitrate

Quantity: number of stations = 6
Description: CTD water analysis - calibration measurements of soccom float pH/TA, POC/HPLC

Nitrate

Quantity: number of stations = 99
Description: Nutrients sampled from CTD bottles

Nitrite

Quantity: number of samples = 60
Description: Nutrients and Nutrient isotope from underway seawater. d13C, d15N and d30Si

Nitrite

Quantity: number of stations = 99
Description: Nutrients sampled from CTD bottles

Ammonia

Quantity: number of samples = 60
Description: Nutrients and Nutrient isotope from underway seawater. d13C, d15N and d30Si

Ammonia

Quantity: number of stations = 99
Description: Nutrients sampled from CTD bottles

Silicate

Quantity: number of stations = 99
Description: Nutrients sampled from CTD bottles

Silicate

Quantity: number of samples = 60
Description: Nutrients and Nutrient isotope from underway seawater. d13C, d15N and d30Si

Quantity: number of stations = 98
Description: CTD water analysis - DIC and pH

Quantity: number of stations = 6
Description: CTD water analysis - calibration measurements of soccom float pH/TA, POC/HPLC

Isotopes

Quantity: number of stations = 25
Description: CTD water analysis - C14, bomb radiocarbon sampled through water column.

Isotopes

Quantity: number of samples = 60
Description: Nutrients and Nutrient isotope from underway seawater. d13C, d15N and d30Si

Isotopes

Quantity: number of stations = 97
Description: CTD water analysis - d18O and carbon 13 isotopes sampled though water column.

Other chemical oceanographic measurements

Quantity: number of stations = 99
Description: CTD water analysis - Salinity. Sampled through water column.

Other chemical oceanographic measurements

Quantity: track kilometres = 14800
Description: OVOCs continously from underway air and seawater

Other chemical oceanographic measurements

Quantity: number of stations = 98
Description: CTD water analysis - CFCs and SF6

Biology and fisheries

Phytoplankton pigs (eg chlorophyll, fluorescence)

Quantity: number of stations = 6
Description: CTD water analysis - calibration measurements of soccom float pH/TA, POC/HPLC

Biochemical measurements (eg lipids, amino acids)

Quantity: number of stations = 28
Description: CTD water analysis - Environmental DNA.

Meteorology

Routine standard measurements

Quantity: track kilometres = 14800
Description: Underway meterological measurements

Geology and geophysics

Multi-beam echosounding

Quantity: track kilometres = 14800
Description: EM122 swath bathymetry data

Moorings, landers, buoys

Physical oceanography

Subsurface temperature and salinity measurements

60° 38' 59" S 42° 9' 7" W — Deep Arvor float. Bottom tracking ARGO style measurements with ADCP and capable of >4000 m dives.

Subsurface temperature and salinity measurements

60° 49' 37" S 27° 13' 44" W — SOCCOM float. Biogeochemical Argo analogue.

Subsurface temperature and salinity measurements

60° 50' 52" S 30° 2' 2" E — SOCCOM float. Biogeochemical Argo analogue.

Subsurface temperature and salinity measurements

60° 19' 12" S 30° 57' 43" W — SOCCOM float. Biogeochemical Argo analogue.

Subsurface temperature and salinity measurements

60° 39' 7" S 42° 8' 59" W — SOCCOM float. Biogeochemical Argo analogue.

Subsurface temperature and salinity measurements

60° 39' 3" S 42° 9' 10" W — Deep Arvor float. Bottom tracking ARGO style measurements with ADCP and capable of >4000 m dives.

Subsurface temperature and salinity measurements

60° 8' 52" S 48° 7' 30" W — SOCCOM float. Biogeochemical Argo analogue.

Subsurface temperature and salinity measurements

57° 32' 13" S 15° 22' 30" E — SOCCOM float. Biogeochemical Argo analogue.

Current profiler (eg ADCP)

60° 38' 59" S 42° 9' 7" W — Deep Arvor float. Bottom tracking ARGO style measurements with ADCP and capable of >4000 m dives.

Current profiler (eg ADCP)

60° 39' 3" S 42° 9' 10" W — Deep Arvor float. Bottom tracking ARGO style measurements with ADCP and capable of >4000 m dives.

Neutrally buoyant floats

60° 39' 7" S 42° 8' 59" W — SOCCOM float. Biogeochemical Argo analogue.

Neutrally buoyant floats

60° 39' 3" S 42° 9' 10" W — Deep Arvor float. Bottom tracking ARGO style measurements with ADCP and capable of >4000 m dives.

Neutrally buoyant floats

60° 38' 59" S 42° 9' 7" W — Deep Arvor float. Bottom tracking ARGO style measurements with ADCP and capable of >4000 m dives.

Neutrally buoyant floats

60° 49' 37" S 27° 13' 44" W — SOCCOM float. Biogeochemical Argo analogue.

Neutrally buoyant floats

60° 8' 52" S 48° 7' 30" W — SOCCOM float. Biogeochemical Argo analogue.

Neutrally buoyant floats

57° 32' 13" S 15° 22' 30" E — SOCCOM float. Biogeochemical Argo analogue.

Neutrally buoyant floats

60° 50' 52" S 30° 2' 2" E — SOCCOM float. Biogeochemical Argo analogue.

Neutrally buoyant floats

60° 19' 12" S 30° 57' 43" W — SOCCOM float. Biogeochemical Argo analogue.

Chemical oceanography

Oxygen

60° 50' 52" S 30° 2' 2" E — SOCCOM float. Biogeochemical Argo analogue.

Oxygen

60° 39' 7" S 42° 8' 59" W — SOCCOM float. Biogeochemical Argo analogue.

Oxygen

60° 8' 52" S 48° 7' 30" W — SOCCOM float. Biogeochemical Argo analogue.

Oxygen

60° 49' 37" S 27° 13' 44" W — SOCCOM float. Biogeochemical Argo analogue.

Oxygen

60° 19' 12" S 30° 57' 43" W — SOCCOM float. Biogeochemical Argo analogue.

Oxygen

57° 32' 13" S 15° 22' 30" E — SOCCOM float. Biogeochemical Argo analogue.

Nitrate

60° 49' 37" S 27° 13' 44" W — SOCCOM float. Biogeochemical Argo analogue.

Nitrate

60° 50' 52" S 30° 2' 2" E — SOCCOM float. Biogeochemical Argo analogue.

Nitrate

57° 32' 13" S 15° 22' 30" E — SOCCOM float. Biogeochemical Argo analogue.

Nitrate

60° 19' 12" S 30° 57' 43" W — SOCCOM float. Biogeochemical Argo analogue.

Nitrate

60° 39' 7" S 42° 8' 59" W — SOCCOM float. Biogeochemical Argo analogue.

Nitrate

60° 8' 52" S 48° 7' 30" W — SOCCOM float. Biogeochemical Argo analogue.

60° 39' 7" S 42° 8' 59" W — SOCCOM float. Biogeochemical Argo analogue.

57° 32' 13" S 15° 22' 30" E — SOCCOM float. Biogeochemical Argo analogue.

60° 50' 52" S 30° 2' 2" E — SOCCOM float. Biogeochemical Argo analogue.

60° 19' 12" S 30° 57' 43" W — SOCCOM float. Biogeochemical Argo analogue.

60° 49' 37" S 27° 13' 44" W — SOCCOM float. Biogeochemical Argo analogue.

60° 8' 52" S 48° 7' 30" W — SOCCOM float. Biogeochemical Argo analogue.

Biology and fisheries

Phytoplankton pigs (eg chlorophyll, fluorescence)

60° 49' 37" S 27° 13' 44" W — SOCCOM float. Biogeochemical Argo analogue.

Phytoplankton pigs (eg chlorophyll, fluorescence)

60° 19' 12" S 30° 57' 43" W — SOCCOM float. Biogeochemical Argo analogue.

Phytoplankton pigs (eg chlorophyll, fluorescence)

60° 39' 7" S 42° 8' 59" W — SOCCOM float. Biogeochemical Argo analogue.

Phytoplankton pigs (eg chlorophyll, fluorescence)

60° 8' 52" S 48° 7' 30" W — SOCCOM float. Biogeochemical Argo analogue.

Phytoplankton pigs (eg chlorophyll, fluorescence)

57° 32' 13" S 15° 22' 30" E — SOCCOM float. Biogeochemical Argo analogue.

Phytoplankton pigs (eg chlorophyll, fluorescence)

60° 50' 52" S 30° 2' 2" E — SOCCOM float. Biogeochemical Argo analogue.

Data held at BODC

Series/Profiles

99 CTD/STD cast

Reference numbers
Transmittance and attenuance of the water column
Vertical spatial coordinates
Optical backscatter
Dissolved oxygen parameters in the water column
Temperature of the water column
Salinity of the water column
Visible waveband radiance and irradiance measurements in the water column
Raw oxygen sensor output
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
2011030	2019-03-01 10:40	60° 44' 5" S 53° 22' 27" W
2011110	2019-03-02 05:28	60° 11' 53" S 50° 30' 45" W
2011134	2019-03-02 11:06	60° 12' 26" S 49° 16' 49" W
2011171	2019-03-02 23:39	60° 8' 53" S 48° 7' 27" W
2011238	2019-03-04 01:37	60° 44' 24" S 42° 47' 23" W
2011275	2019-03-04 09:18	60° 39' 25" S 42° 11' 49" W
2011379	2019-03-05 17:46	60° 25' 43" S 40° 4' 10" W
2011933	2019-03-22 07:47	57° 53' 58" S 11° 50' 29" E
2012008	2019-03-28 04:33	59° 41' 16" S 27° 10' 4" E
2012021	2019-03-29 13:23	60° 30' 0" S 30° 0' 0" E
2010978	2019-02-28 10:06	62° 30' 16" S 56° 47' 31" W
2011005	2019-02-28 19:37	61° 23' 31" S 56° 41' 39" W
2011318	2019-03-04 22:48	60° 37' 14" S 41° 59' 17" W
2011367	2019-03-05 12:29	60° 28' 13" S 40° 58' 50" W
2011540	2019-03-08 22:55	59° 53' 59" S 32° 48' 29" W
2011564	2019-03-09 04:55	59° 56' 23" S 32° 14' 25" W
2011890	2019-03-20 21:49	58° 24' 58" S 5° 49' 33" E
2011908	2019-03-21 08:38	58° 19' 52" S 7° 45' 34" E
2011957	2019-03-23 07:41	57° 32' 15" S 15° 22' 29" E
2011982	2019-03-26 20:51	58° 2' 19" S 21° 33' 28" E
2011195	2019-03-03 06:07	60° 8' 51" S 47° 20' 5" W
2011306	2019-03-04 19:05	60° 38' 24" S 42° 6' 8" W
2011423	2019-03-06 13:40	60° 26' 24" S 37° 59' 57" W
2011435	2019-03-06 18:46	60° 27' 36" S 37° 22' 7" W
2011459	2019-03-07 07:40	60° 18' 11" S 35° 28' 32" W
2011472	2019-03-08 00:50	60° 1' 49" S 34° 28' 18" W
2011588	2019-03-09 13:48	60° 19' 10" S 30° 57' 37" W
2011644	2019-03-11 21:10	59° 57' 27" S 25° 29' 30" W
2011656	2019-03-12 02:21	60° 6' 41" S 25° 18' 43" W
2011841	2019-03-18 00:31	60° 24' 1" S 9° 2' 30" W
2011877	2019-03-19 17:45	59° 12' 6" S 0° 6' 10" W
2011889	2019-03-20 08:07	58° 49' 1" S 2° 51' 26" E
2011945	2019-03-22 18:38	57° 42' 47" S 13° 29' 19" E
2011970	2019-03-26 08:41	57° 13' 48" S 18° 59' 23" E
2010966	2019-02-25 21:10	55° 18' 55" S 57° 22' 36" W
2011017	2019-03-01 04:20	61° 2' 26" S 54° 24' 18" W
2011054	2019-03-01 16:49	60° 32' 55" S 52° 21' 10" W
2011091	2019-03-01 23:58	60° 15' 10" S 51° 11' 37" W
2011109	2019-03-02 02:18	60° 13' 26" S 50° 55' 54" W
2011183	2019-03-03 02:59	60° 7' 36" S 47° 41' 40" W
2011214	2019-03-03 20:05	60° 55' 10" S 43° 59' 55" W
2011460	2019-03-07 22:15	60° 8' 19" S 34° 53' 25" W
2011496	2019-03-08 08:36	59° 50' 56" S 33° 16' 43" W
2011503	2019-03-08 10:58	59° 51' 35" S 33° 9' 35" W
2011620	2019-03-10 07:53	60° 47' 49" S 27° 25' 32" W
2011632	2019-03-10 12:32	60° 49' 36" S 27° 13' 41" W
2011785	2019-04-06 17:43	61° 43' 16" S 18° 49' 32" W
2011816	2019-04-04 12:32	60° 59' 50" S 13° 30' 22" W
2011828	2019-03-17 10:14	60° 48' 1" S 12° 1' 10" W
2011865	2019-03-19 04:48	59° 37' 4" S 3° 6' 35" W
2011921	2019-03-21 18:31	58° 4' 0" S 9° 39' 39" E
2011226	2019-03-04 00:07	60° 45' 34" S 42° 57' 34" W
2011263	2019-03-04 06:41	60° 39' 36" S 42° 18' 35" W
2011299	2019-03-04 15:05	60° 39' 8" S 42° 9' 0" W
2011331	2019-03-05 02:38	60° 36' 17" S 41° 49' 57" W
2011343	2019-03-05 05:50	60° 34' 12" S 41° 41' 28" W
2011576	2019-03-09 09:02	59° 58' 9" S 31° 28' 46" W
2011693	2019-03-12 20:23	60° 26' 17" S 24° 46' 47" W
2011700	2019-03-13 08:53	60° 33' 22" S 24° 40' 17" W
2011736	2019-03-14 17:36	61° 13' 50" S 24° 15' 39" W
2011761	2019-04-07 05:38	61° 37' 51" S 21° 17' 3" W
2012033	2019-03-29 21:36	61° 0' 0" S 30° 0' 0" E
2012045	2019-03-30 05:50	61° 30' 1" S 29° 59' 58" E
2010954	2019-02-23 21:08	53° 30' 11" S 58° 29' 43" W
2011066	2019-03-01 19:38	60° 22' 12" S 51° 53' 11" W
2011122	2019-03-02 07:55	60° 13' 32" S 50° 2' 36" W
2011287	2019-03-04 11:54	60° 39' 22" S 42° 10' 32" W
2011539	2019-03-08 20:01	59° 53' 24" S 32° 51' 34" W
2011668	2019-03-12 07:20	60° 10' 36" S 25° 13' 49" W
2011712	2019-03-13 13:33	60° 26' 16" S 24° 46' 44" W
2011797	2019-04-06 08:52	61° 25' 51" S 17° 4' 28" W
2011804	2019-04-06 00:41	61° 17' 51" S 15° 52' 31" W
2011853	2019-03-18 14:59	60° 0' 2" S 6° 3' 6" W
2010991	2019-02-28 14:00	62° 10' 14" S 56° 40' 13" W
2011029	2019-03-01 06:48	60° 57' 49" S 54° 10' 18" W
2011042	2019-03-01 14:17	60° 26' 32" S 52° 49' 54" W
2011146	2019-03-02 14:22	60° 9' 55" S 48° 35' 4" W
2011202	2019-03-03 09:42	60° 21' 14" S 46° 46' 4" W
2011251	2019-03-04 04:29	60° 40' 47" S 42° 23' 24" W
2011355	2019-03-05 09:11	60° 31' 46" S 41° 22' 38" W
2011380	2019-03-05 23:29	60° 24' 35" S 39° 18' 0" W
2011447	2019-03-07 01:05	60° 22' 43" S 36° 24' 4" W
2011607	2019-03-09 20:18	60° 28' 7" S 29° 44' 10" W
2011748	2019-03-15 02:39	61° 25' 48" S 22° 46' 14" W
2011773	2019-03-15 21:53	61° 49' 57" S 19° 47' 49" W
2011994	2019-03-27 13:01	58° 52' 21" S 24° 22' 14" E
2011078	2019-03-01 22:02	60° 17' 18" S 51° 23' 12" W
2011158	2019-03-02 20:16	60° 8' 44" S 48° 16' 36" W
2011392	2019-03-06 02:31	60° 24' 35" S 39° 7' 10" W
2011411	2019-03-06 08:06	60° 25' 9" S 38° 42' 34" W
2011484	2019-03-08 04:40	59° 55' 48" S 33° 50' 59" W
2011515	2019-03-08 13:36	59° 51' 36" S 33° 4' 14" W
2011527	2019-03-08 16:31	59° 52' 48" S 32° 56' 58" W
2011552	2019-03-09 01:29	59° 54' 1" S 32° 43' 51" W
2011619	2019-03-10 03:10	60° 41' 7" S 28° 15' 47" W
2011681	2019-03-12 12:27	60° 13' 16" S 25° 7' 56" W
2011724	2019-03-14 09:56	61° 0' 53" S 25° 44' 46" W
2011969	2019-03-23 18:40	57° 22' 7" S 17° 15' 32" E
2012057	2019-04-09 07:20	60° 13' 46" S 35° 18' 36" W

Discrete samples

105 CTD frame plus rosette sampler

59 Sample taken from ship's non-toxic supply

Resources

RRS James Clark Ross JR18005

Cruise summary report

Quick links

BODC holdings

EDMED