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RRS James Cook JC211

Cruise summary report

Cruise Info. 
Ship name (ship code)RRS James Cook (740H)
Cruise identifierJC211
Cruise period2021-02-02 — 2021-03-07
StatusCompleted
Port of departureMare Harbour, Falkland Islands (Malvinas)
Port of returnMare Harbour, Falkland Islands (Malvinas)
PurposeResearch
ObjectivesThis cruise was formed from four separate tasks / SMEs:
- the Polar Ocean Ecosystems Time Series (POETS), aiming to monitor the ecosystem around South Georgia, consisting of acoustic transects, turnaround of two moorings (one deep, one shallow), CTD and bongo net casts on the transects and at each mooring site, and calibration of the scientific echo sounders
- deployment of two gliders, accompanied by CTD casts near iceberg A-68A, southeast of South Georgia
- the A23 oceanographic transect from the shelf break southeast of South Georgia, south through the eastern Scotia Sea, and into the northern Weddell Sea
- the SR1b oceanographic transect from Elephant Island off the tip of the Antarctic Peninsula to Burdwood Bank south of the Falkland Islands

After recovering mooring P3, acoustic transects in the Western Core Box, north of South Georgia, were performed during the day, with CTD and bongo casts overnight. Mooring WCB was also recovered and redeployed before an acoustic calibration was performed in Stromness Harbour, and P3 was redeployed.

Additional CTD casts were performed around iceberg A-68A and the smaller icebergs that had calved from it. Two gliders were also deployed, one south of the iceberg and one to the north. A CTD transect onto the shelf SE of South Georgia was also done to see the effect of the wake of iceberg A-68H, which had passed through the area earlier.

The A23 repeat CTD section was re-occupied from South Georgia to the south. Because of poor weather and lack of time, the southernmost planned station was not occupied; there was also a weather delay of almost 24 hours on 22-23 Feb. Two Argo floats were deployed on this transect.

The SR1b repeat section was re-occupied from south to north. After the initial cast, deteriorating weather caused the ship to seek shelter south of Elephant Island, where an acoustic transect to obtain bottom track calibration points for the ADCPs was performed. Subsequently the weather improved, allowing the CTD casts to continue, and no further weather delays were encountered. Two Argo floats were deployed on this transect.

Since some additional time remained before the ship could return to port, five additional CTD casts were made in the western extension of the Falkland Trough between Burdwood Bank and the Falkland Islands, before performing further acoustic transects at varying headings east of Sea Lion Island to improve the calibration of the ADCPs.
Chief scientistPovl Abrahamsen (British Antarctic Survey)
Cruise reportRRS James Cook JC211 cruise report jc211.pdf (6.90 MB) 
Ocean/sea areas 
GeneralSouth West Atlantic Ocean (limit 20W)
Southern Ocean
Unknown
SpecificSouthern Ocean: Drake Passage, Scotia Sea, Weddell Sea
Track chartsRRS James Cook JC211 cruise track — jc211trk.pdf (1.66 MB) 
Measurements 
Physical oceanography 
Surface measurements underway (T,S)Quantity: activity duration in days = 34
Description: Routine underway measurements, including meteorology, near-surface T/S/fluorometer/transmissometer measurements from uncontaminated seawater supply, 75-kHz and 150-kHz vessel-mounted ADCPs, single-beam and multi-beam hydrographic echo sounders. Includes underway salinity samples taken approximately every 4-6 hours for calibration of thermosalinograph salinities.
Water bottle stationsQuantity: number of stations = 100
Description: CTD/LADCP casts with water samples. Parameters on CTD include dual temperature/conductivity/oxygen, chlorophyll a fluorometer, transmissometer, backscatter sensor, altimeter, upward- and downward-looking PAR radiometers. Dual (upward- and downward-looking) 300-kHz lowered ADCPs.. Salinity samples were collected from 97 stations with up to 18 depths per cast.. Dissolved oxygen samples were collected from 81 stations with up to 12 depths per cast.. Samples for dissolved inorganic nutrients (nitrate+nitrite, phosphate, silicate, ammonia) were collected from 33 stations with up to 6 depths per cast, to be analysed ashore at BAS.. Samples for ??18O (stable isotopes of oxygen) were collected from 67 stations with up to 18 depths per cast, to be analysed ashore at BGS.. Samples for ??30Si (stable isotopes of silicon in dissolved silicate) were collected from 32 stations with up to 6 depths per cast, to be analysed ashore. Some were filtered (with filter papers and water collected), others frozen unfiltered.. Samples for chlorophyll were collected from 10 stations with up to 6 depths per cast and filtered on board, with filter papers to be analysed ashore.. Samples for particulate organic matter (POM) were collected from 13 stations with up to 9 depths per cast and filtered on board, with filter papers to be analysed ashore.. Samples for phytoplankton were collected from 31 stations with up to 6 depths per cast and fixed in Lugol’s iodine acid solution to be analysed ashore.
CTD stationsQuantity: number of stations = 100
Description: CTD/LADCP casts with water samples. Parameters on CTD include dual temperature/conductivity/oxygen, chlorophyll a fluorometer, transmissometer, backscatter sensor, altimeter, upward- and downward-looking PAR radiometers. Dual (upward- and downward-looking) 300-kHz lowered ADCPs.. Salinity samples were collected from 97 stations with up to 18 depths per cast.. Dissolved oxygen samples were collected from 81 stations with up to 12 depths per cast.. Samples for dissolved inorganic nutrients (nitrate+nitrite, phosphate, silicate, ammonia) were collected from 33 stations with up to 6 depths per cast, to be analysed ashore at BAS.. Samples for ??18O (stable isotopes of oxygen) were collected from 67 stations with up to 18 depths per cast, to be analysed ashore at BGS.. Samples for ??30Si (stable isotopes of silicon in dissolved silicate) were collected from 32 stations with up to 6 depths per cast, to be analysed ashore. Some were filtered (with filter papers and water collected), others frozen unfiltered.. Samples for chlorophyll were collected from 10 stations with up to 6 depths per cast and filtered on board, with filter papers to be analysed ashore.. Samples for particulate organic matter (POM) were collected from 13 stations with up to 9 depths per cast and filtered on board, with filter papers to be analysed ashore.. Samples for phytoplankton were collected from 31 stations with up to 6 depths per cast and fixed in Lugol’s iodine acid solution to be analysed ashore.
Transparency (eg transmissometer)Quantity: number of stations = 100
Description: CTD/LADCP casts with water samples. Parameters on CTD include dual temperature/conductivity/oxygen, chlorophyll a fluorometer, transmissometer, backscatter sensor, altimeter, upward- and downward-looking PAR radiometers. Dual (upward- and downward-looking) 300-kHz lowered ADCPs.. Salinity samples were collected from 97 stations with up to 18 depths per cast.. Dissolved oxygen samples were collected from 81 stations with up to 12 depths per cast.. Samples for dissolved inorganic nutrients (nitrate+nitrite, phosphate, silicate, ammonia) were collected from 33 stations with up to 6 depths per cast, to be analysed ashore at BAS.. Samples for ??18O (stable isotopes of oxygen) were collected from 67 stations with up to 18 depths per cast, to be analysed ashore at BGS.. Samples for ??30Si (stable isotopes of silicon in dissolved silicate) were collected from 32 stations with up to 6 depths per cast, to be analysed ashore. Some were filtered (with filter papers and water collected), others frozen unfiltered.. Samples for chlorophyll were collected from 10 stations with up to 6 depths per cast and filtered on board, with filter papers to be analysed ashore.. Samples for particulate organic matter (POM) were collected from 13 stations with up to 9 depths per cast and filtered on board, with filter papers to be analysed ashore.. Samples for phytoplankton were collected from 31 stations with up to 6 depths per cast and fixed in Lugol’s iodine acid solution to be analysed ashore.
Transparency (eg transmissometer)Quantity: activity duration in days = 34
Description: Routine underway measurements, including meteorology, near-surface T/S/fluorometer/transmissometer measurements from uncontaminated seawater supply, 75-kHz and 150-kHz vessel-mounted ADCPs, single-beam and multi-beam hydrographic echo sounders. Includes underway salinity samples taken approximately every 4-6 hours for calibration of thermosalinograph salinities.
Optics (eg underwater light levels)Quantity: number of stations = 100
Description: CTD/LADCP casts with water samples. Parameters on CTD include dual temperature/conductivity/oxygen, chlorophyll a fluorometer, transmissometer, backscatter sensor, altimeter, upward- and downward-looking PAR radiometers. Dual (upward- and downward-looking) 300-kHz lowered ADCPs.. Salinity samples were collected from 97 stations with up to 18 depths per cast.. Dissolved oxygen samples were collected from 81 stations with up to 12 depths per cast.. Samples for dissolved inorganic nutrients (nitrate+nitrite, phosphate, silicate, ammonia) were collected from 33 stations with up to 6 depths per cast, to be analysed ashore at BAS.. Samples for ??18O (stable isotopes of oxygen) were collected from 67 stations with up to 18 depths per cast, to be analysed ashore at BGS.. Samples for ??30Si (stable isotopes of silicon in dissolved silicate) were collected from 32 stations with up to 6 depths per cast, to be analysed ashore. Some were filtered (with filter papers and water collected), others frozen unfiltered.. Samples for chlorophyll were collected from 10 stations with up to 6 depths per cast and filtered on board, with filter papers to be analysed ashore.. Samples for particulate organic matter (POM) were collected from 13 stations with up to 9 depths per cast and filtered on board, with filter papers to be analysed ashore.. Samples for phytoplankton were collected from 31 stations with up to 6 depths per cast and fixed in Lugol’s iodine acid solution to be analysed ashore.
Current profiler (eg ADCP)Quantity: activity duration in days = 34
Description: Routine underway measurements, including meteorology, near-surface T/S/fluorometer/transmissometer measurements from uncontaminated seawater supply, 75-kHz and 150-kHz vessel-mounted ADCPs, single-beam and multi-beam hydrographic echo sounders. Includes underway salinity samples taken approximately every 4-6 hours for calibration of thermosalinograph salinities.
Current profiler (eg ADCP)Quantity: number of stations = 100
Description: CTD/LADCP casts with water samples. Parameters on CTD include dual temperature/conductivity/oxygen, chlorophyll a fluorometer, transmissometer, backscatter sensor, altimeter, upward- and downward-looking PAR radiometers. Dual (upward- and downward-looking) 300-kHz lowered ADCPs.. Salinity samples were collected from 97 stations with up to 18 depths per cast.. Dissolved oxygen samples were collected from 81 stations with up to 12 depths per cast.. Samples for dissolved inorganic nutrients (nitrate+nitrite, phosphate, silicate, ammonia) were collected from 33 stations with up to 6 depths per cast, to be analysed ashore at BAS.. Samples for ??18O (stable isotopes of oxygen) were collected from 67 stations with up to 18 depths per cast, to be analysed ashore at BGS.. Samples for ??30Si (stable isotopes of silicon in dissolved silicate) were collected from 32 stations with up to 6 depths per cast, to be analysed ashore. Some were filtered (with filter papers and water collected), others frozen unfiltered.. Samples for chlorophyll were collected from 10 stations with up to 6 depths per cast and filtered on board, with filter papers to be analysed ashore.. Samples for particulate organic matter (POM) were collected from 13 stations with up to 9 depths per cast and filtered on board, with filter papers to be analysed ashore.. Samples for phytoplankton were collected from 31 stations with up to 6 depths per cast and fixed in Lugol’s iodine acid solution to be analysed ashore.
Chemical oceanography 
OxygenQuantity: number of stations = 100
Description: CTD/LADCP casts with water samples. Parameters on CTD include dual temperature/conductivity/oxygen, chlorophyll a fluorometer, transmissometer, backscatter sensor, altimeter, upward- and downward-looking PAR radiometers. Dual (upward- and downward-looking) 300-kHz lowered ADCPs.. Salinity samples were collected from 97 stations with up to 18 depths per cast.. Dissolved oxygen samples were collected from 81 stations with up to 12 depths per cast.. Samples for dissolved inorganic nutrients (nitrate+nitrite, phosphate, silicate, ammonia) were collected from 33 stations with up to 6 depths per cast, to be analysed ashore at BAS.. Samples for ??18O (stable isotopes of oxygen) were collected from 67 stations with up to 18 depths per cast, to be analysed ashore at BGS.. Samples for ??30Si (stable isotopes of silicon in dissolved silicate) were collected from 32 stations with up to 6 depths per cast, to be analysed ashore. Some were filtered (with filter papers and water collected), others frozen unfiltered.. Samples for chlorophyll were collected from 10 stations with up to 6 depths per cast and filtered on board, with filter papers to be analysed ashore.. Samples for particulate organic matter (POM) were collected from 13 stations with up to 9 depths per cast and filtered on board, with filter papers to be analysed ashore.. Samples for phytoplankton were collected from 31 stations with up to 6 depths per cast and fixed in Lugol’s iodine acid solution to be analysed ashore.
PhosphateQuantity: number of stations = 100
Description: CTD/LADCP casts with water samples. Parameters on CTD include dual temperature/conductivity/oxygen, chlorophyll a fluorometer, transmissometer, backscatter sensor, altimeter, upward- and downward-looking PAR radiometers. Dual (upward- and downward-looking) 300-kHz lowered ADCPs.. Salinity samples were collected from 97 stations with up to 18 depths per cast.. Dissolved oxygen samples were collected from 81 stations with up to 12 depths per cast.. Samples for dissolved inorganic nutrients (nitrate+nitrite, phosphate, silicate, ammonia) were collected from 33 stations with up to 6 depths per cast, to be analysed ashore at BAS.. Samples for ??18O (stable isotopes of oxygen) were collected from 67 stations with up to 18 depths per cast, to be analysed ashore at BGS.. Samples for ??30Si (stable isotopes of silicon in dissolved silicate) were collected from 32 stations with up to 6 depths per cast, to be analysed ashore. Some were filtered (with filter papers and water collected), others frozen unfiltered.. Samples for chlorophyll were collected from 10 stations with up to 6 depths per cast and filtered on board, with filter papers to be analysed ashore.. Samples for particulate organic matter (POM) were collected from 13 stations with up to 9 depths per cast and filtered on board, with filter papers to be analysed ashore.. Samples for phytoplankton were collected from 31 stations with up to 6 depths per cast and fixed in Lugol’s iodine acid solution to be analysed ashore.
PhosphateQuantity: activity duration in days = 3
Description: 20 water samples for dissolved inorganic nutrients (nitrate+nitrite, phosphate, silicate, ammonia) collected from uncontaminated seawater supply, to be analysed ashore at BAS.
NitrateQuantity: number of stations = 100
Description: CTD/LADCP casts with water samples. Parameters on CTD include dual temperature/conductivity/oxygen, chlorophyll a fluorometer, transmissometer, backscatter sensor, altimeter, upward- and downward-looking PAR radiometers. Dual (upward- and downward-looking) 300-kHz lowered ADCPs.. Salinity samples were collected from 97 stations with up to 18 depths per cast.. Dissolved oxygen samples were collected from 81 stations with up to 12 depths per cast.. Samples for dissolved inorganic nutrients (nitrate+nitrite, phosphate, silicate, ammonia) were collected from 33 stations with up to 6 depths per cast, to be analysed ashore at BAS.. Samples for ??18O (stable isotopes of oxygen) were collected from 67 stations with up to 18 depths per cast, to be analysed ashore at BGS.. Samples for ??30Si (stable isotopes of silicon in dissolved silicate) were collected from 32 stations with up to 6 depths per cast, to be analysed ashore. Some were filtered (with filter papers and water collected), others frozen unfiltered.. Samples for chlorophyll were collected from 10 stations with up to 6 depths per cast and filtered on board, with filter papers to be analysed ashore.. Samples for particulate organic matter (POM) were collected from 13 stations with up to 9 depths per cast and filtered on board, with filter papers to be analysed ashore.. Samples for phytoplankton were collected from 31 stations with up to 6 depths per cast and fixed in Lugol’s iodine acid solution to be analysed ashore.
NitrateQuantity: activity duration in days = 3
Description: 20 water samples for dissolved inorganic nutrients (nitrate+nitrite, phosphate, silicate, ammonia) collected from uncontaminated seawater supply, to be analysed ashore at BAS.
NitriteQuantity: number of stations = 100
Description: CTD/LADCP casts with water samples. Parameters on CTD include dual temperature/conductivity/oxygen, chlorophyll a fluorometer, transmissometer, backscatter sensor, altimeter, upward- and downward-looking PAR radiometers. Dual (upward- and downward-looking) 300-kHz lowered ADCPs.. Salinity samples were collected from 97 stations with up to 18 depths per cast.. Dissolved oxygen samples were collected from 81 stations with up to 12 depths per cast.. Samples for dissolved inorganic nutrients (nitrate+nitrite, phosphate, silicate, ammonia) were collected from 33 stations with up to 6 depths per cast, to be analysed ashore at BAS.. Samples for ??18O (stable isotopes of oxygen) were collected from 67 stations with up to 18 depths per cast, to be analysed ashore at BGS.. Samples for ??30Si (stable isotopes of silicon in dissolved silicate) were collected from 32 stations with up to 6 depths per cast, to be analysed ashore. Some were filtered (with filter papers and water collected), others frozen unfiltered.. Samples for chlorophyll were collected from 10 stations with up to 6 depths per cast and filtered on board, with filter papers to be analysed ashore.. Samples for particulate organic matter (POM) were collected from 13 stations with up to 9 depths per cast and filtered on board, with filter papers to be analysed ashore.. Samples for phytoplankton were collected from 31 stations with up to 6 depths per cast and fixed in Lugol’s iodine acid solution to be analysed ashore.
NitriteQuantity: activity duration in days = 3
Description: 20 water samples for dissolved inorganic nutrients (nitrate+nitrite, phosphate, silicate, ammonia) collected from uncontaminated seawater supply, to be analysed ashore at BAS.
AmmoniaQuantity: number of stations = 100
Description: CTD/LADCP casts with water samples. Parameters on CTD include dual temperature/conductivity/oxygen, chlorophyll a fluorometer, transmissometer, backscatter sensor, altimeter, upward- and downward-looking PAR radiometers. Dual (upward- and downward-looking) 300-kHz lowered ADCPs.. Salinity samples were collected from 97 stations with up to 18 depths per cast.. Dissolved oxygen samples were collected from 81 stations with up to 12 depths per cast.. Samples for dissolved inorganic nutrients (nitrate+nitrite, phosphate, silicate, ammonia) were collected from 33 stations with up to 6 depths per cast, to be analysed ashore at BAS.. Samples for ??18O (stable isotopes of oxygen) were collected from 67 stations with up to 18 depths per cast, to be analysed ashore at BGS.. Samples for ??30Si (stable isotopes of silicon in dissolved silicate) were collected from 32 stations with up to 6 depths per cast, to be analysed ashore. Some were filtered (with filter papers and water collected), others frozen unfiltered.. Samples for chlorophyll were collected from 10 stations with up to 6 depths per cast and filtered on board, with filter papers to be analysed ashore.. Samples for particulate organic matter (POM) were collected from 13 stations with up to 9 depths per cast and filtered on board, with filter papers to be analysed ashore.. Samples for phytoplankton were collected from 31 stations with up to 6 depths per cast and fixed in Lugol’s iodine acid solution to be analysed ashore.
AmmoniaQuantity: activity duration in days = 3
Description: 20 water samples for dissolved inorganic nutrients (nitrate+nitrite, phosphate, silicate, ammonia) collected from uncontaminated seawater supply, to be analysed ashore at BAS.
SilicateQuantity: activity duration in days = 3
Description: 20 water samples for dissolved inorganic nutrients (nitrate+nitrite, phosphate, silicate, ammonia) collected from uncontaminated seawater supply, to be analysed ashore at BAS.
SilicateQuantity: number of stations = 100
Description: CTD/LADCP casts with water samples. Parameters on CTD include dual temperature/conductivity/oxygen, chlorophyll a fluorometer, transmissometer, backscatter sensor, altimeter, upward- and downward-looking PAR radiometers. Dual (upward- and downward-looking) 300-kHz lowered ADCPs.. Salinity samples were collected from 97 stations with up to 18 depths per cast.. Dissolved oxygen samples were collected from 81 stations with up to 12 depths per cast.. Samples for dissolved inorganic nutrients (nitrate+nitrite, phosphate, silicate, ammonia) were collected from 33 stations with up to 6 depths per cast, to be analysed ashore at BAS.. Samples for ??18O (stable isotopes of oxygen) were collected from 67 stations with up to 18 depths per cast, to be analysed ashore at BGS.. Samples for ??30Si (stable isotopes of silicon in dissolved silicate) were collected from 32 stations with up to 6 depths per cast, to be analysed ashore. Some were filtered (with filter papers and water collected), others frozen unfiltered.. Samples for chlorophyll were collected from 10 stations with up to 6 depths per cast and filtered on board, with filter papers to be analysed ashore.. Samples for particulate organic matter (POM) were collected from 13 stations with up to 9 depths per cast and filtered on board, with filter papers to be analysed ashore.. Samples for phytoplankton were collected from 31 stations with up to 6 depths per cast and fixed in Lugol’s iodine acid solution to be analysed ashore.
IsotopesQuantity: activity duration in days = 3
Description: 21 water samples for delta-O-18 (stable isotopes of oxygen) collected from uncontaminated seawater supply, to be analysed ashore at BGS.
IsotopesQuantity: number of stations = 100
Description: CTD/LADCP casts with water samples. Parameters on CTD include dual temperature/conductivity/oxygen, chlorophyll a fluorometer, transmissometer, backscatter sensor, altimeter, upward- and downward-looking PAR radiometers. Dual (upward- and downward-looking) 300-kHz lowered ADCPs.. Salinity samples were collected from 97 stations with up to 18 depths per cast.. Dissolved oxygen samples were collected from 81 stations with up to 12 depths per cast.. Samples for dissolved inorganic nutrients (nitrate+nitrite, phosphate, silicate, ammonia) were collected from 33 stations with up to 6 depths per cast, to be analysed ashore at BAS.. Samples for ??18O (stable isotopes of oxygen) were collected from 67 stations with up to 18 depths per cast, to be analysed ashore at BGS.. Samples for ??30Si (stable isotopes of silicon in dissolved silicate) were collected from 32 stations with up to 6 depths per cast, to be analysed ashore. Some were filtered (with filter papers and water collected), others frozen unfiltered.. Samples for chlorophyll were collected from 10 stations with up to 6 depths per cast and filtered on board, with filter papers to be analysed ashore.. Samples for particulate organic matter (POM) were collected from 13 stations with up to 9 depths per cast and filtered on board, with filter papers to be analysed ashore.. Samples for phytoplankton were collected from 31 stations with up to 6 depths per cast and fixed in Lugol’s iodine acid solution to be analysed ashore.
Biology and fisheries 
Phytoplankton pigs (eg chlorophyll, fluorescence)Quantity: number of stations = 100
Description: CTD/LADCP casts with water samples. Parameters on CTD include dual temperature/conductivity/oxygen, chlorophyll a fluorometer, transmissometer, backscatter sensor, altimeter, upward- and downward-looking PAR radiometers. Dual (upward- and downward-looking) 300-kHz lowered ADCPs.. Salinity samples were collected from 97 stations with up to 18 depths per cast.. Dissolved oxygen samples were collected from 81 stations with up to 12 depths per cast.. Samples for dissolved inorganic nutrients (nitrate+nitrite, phosphate, silicate, ammonia) were collected from 33 stations with up to 6 depths per cast, to be analysed ashore at BAS.. Samples for ??18O (stable isotopes of oxygen) were collected from 67 stations with up to 18 depths per cast, to be analysed ashore at BGS.. Samples for ??30Si (stable isotopes of silicon in dissolved silicate) were collected from 32 stations with up to 6 depths per cast, to be analysed ashore. Some were filtered (with filter papers and water collected), others frozen unfiltered.. Samples for chlorophyll were collected from 10 stations with up to 6 depths per cast and filtered on board, with filter papers to be analysed ashore.. Samples for particulate organic matter (POM) were collected from 13 stations with up to 9 depths per cast and filtered on board, with filter papers to be analysed ashore.. Samples for phytoplankton were collected from 31 stations with up to 6 depths per cast and fixed in Lugol’s iodine acid solution to be analysed ashore.
Particulate organic matter (inc POC, PON)Quantity: number of stations = 100
Description: CTD/LADCP casts with water samples. Parameters on CTD include dual temperature/conductivity/oxygen, chlorophyll a fluorometer, transmissometer, backscatter sensor, altimeter, upward- and downward-looking PAR radiometers. Dual (upward- and downward-looking) 300-kHz lowered ADCPs.. Salinity samples were collected from 97 stations with up to 18 depths per cast.. Dissolved oxygen samples were collected from 81 stations with up to 12 depths per cast.. Samples for dissolved inorganic nutrients (nitrate+nitrite, phosphate, silicate, ammonia) were collected from 33 stations with up to 6 depths per cast, to be analysed ashore at BAS.. Samples for ??18O (stable isotopes of oxygen) were collected from 67 stations with up to 18 depths per cast, to be analysed ashore at BGS.. Samples for ??30Si (stable isotopes of silicon in dissolved silicate) were collected from 32 stations with up to 6 depths per cast, to be analysed ashore. Some were filtered (with filter papers and water collected), others frozen unfiltered.. Samples for chlorophyll were collected from 10 stations with up to 6 depths per cast and filtered on board, with filter papers to be analysed ashore.. Samples for particulate organic matter (POM) were collected from 13 stations with up to 9 depths per cast and filtered on board, with filter papers to be analysed ashore.. Samples for phytoplankton were collected from 31 stations with up to 6 depths per cast and fixed in Lugol’s iodine acid solution to be analysed ashore.
PhytoplanktonQuantity: number of stations = 100
Description: CTD/LADCP casts with water samples. Parameters on CTD include dual temperature/conductivity/oxygen, chlorophyll a fluorometer, transmissometer, backscatter sensor, altimeter, upward- and downward-looking PAR radiometers. Dual (upward- and downward-looking) 300-kHz lowered ADCPs.. Salinity samples were collected from 97 stations with up to 18 depths per cast.. Dissolved oxygen samples were collected from 81 stations with up to 12 depths per cast.. Samples for dissolved inorganic nutrients (nitrate+nitrite, phosphate, silicate, ammonia) were collected from 33 stations with up to 6 depths per cast, to be analysed ashore at BAS.. Samples for ??18O (stable isotopes of oxygen) were collected from 67 stations with up to 18 depths per cast, to be analysed ashore at BGS.. Samples for ??30Si (stable isotopes of silicon in dissolved silicate) were collected from 32 stations with up to 6 depths per cast, to be analysed ashore. Some were filtered (with filter papers and water collected), others frozen unfiltered.. Samples for chlorophyll were collected from 10 stations with up to 6 depths per cast and filtered on board, with filter papers to be analysed ashore.. Samples for particulate organic matter (POM) were collected from 13 stations with up to 9 depths per cast and filtered on board, with filter papers to be analysed ashore.. Samples for phytoplankton were collected from 31 stations with up to 6 depths per cast and fixed in Lugol’s iodine acid solution to be analysed ashore.
ZooplanktonQuantity: number of stations = 10
Description: Casts with bongo nets to 200 m depth. Haul fixed in ethanol to be analysed ashore.
Acoustic reflection on marine organisms.Quantity: activity duration in days = 34
Description: Measurements using biological echo sounders at 18, 38, 70, 120 and 200 kHz.
Meteorology 
Incident radiationQuantity: activity duration in days = 34
Description: Routine underway measurements, including meteorology, near-surface T/S/fluorometer/transmissometer measurements from uncontaminated seawater supply, 75-kHz and 150-kHz vessel-mounted ADCPs, single-beam and multi-beam hydrographic echo sounders. Includes underway salinity samples taken approximately every 4-6 hours for calibration of thermosalinograph salinities.
Routine standard measurementsQuantity: activity duration in days = 34
Description: Routine underway measurements, including meteorology, near-surface T/S/fluorometer/transmissometer measurements from uncontaminated seawater supply, 75-kHz and 150-kHz vessel-mounted ADCPs, single-beam and multi-beam hydrographic echo sounders. Includes underway salinity samples taken approximately every 4-6 hours for calibration of thermosalinograph salinities.
Geology and geophysics 
Single-beam echosoundingQuantity: activity duration in days = 34
Description: Routine underway measurements, including meteorology, near-surface T/S/fluorometer/transmissometer measurements from uncontaminated seawater supply, 75-kHz and 150-kHz vessel-mounted ADCPs, single-beam and multi-beam hydrographic echo sounders. Includes underway salinity samples taken approximately every 4-6 hours for calibration of thermosalinograph salinities.
Multi-beam echosoundingQuantity: activity duration in days = 34
Description: Routine underway measurements, including meteorology, near-surface T/S/fluorometer/transmissometer measurements from uncontaminated seawater supply, 75-kHz and 150-kHz vessel-mounted ADCPs, single-beam and multi-beam hydrographic echo sounders. Includes underway salinity samples taken approximately every 4-6 hours for calibration of thermosalinograph salinities.
Moorings, landers, buoys 
Physical oceanography 
Subsurface temperature and salinity measurements56° 58' 36" S  34° 40' 12" W — Deployed TWR Slocum G2 glider 405 on 14 Feb 2021.. Instrumentation: SeaBird glider CTD, ECO Puck combined Chl A / CDOM fluorometer + backscatter
Subsurface temperature and salinity measurements63° 4' 59" S  30° 6' 0" W — Deployed TWR Apex Argo profiling float 8991, WMO ID 1901927, on 24 Feb 2021.
Subsurface temperature and salinity measurements56° 14' 12" S  34° 38' 59" W — Deployed TWR Slocum G2 glider 439 on 15 Feb 2021.. Instrumentation: SeaBird glider CTD, ECO Puck combined Chl A / CDOM fluorometer + backscatter
Subsurface temperature and salinity measurements58° 22' 0" S  56° 13' 23" W — Deployed TWR Apex Argo profiling float 8576, WMO ID 1901926, on 2 Mar 2021.
Subsurface temperature and salinity measurements61° 33' 6" S  31° 6' 6" W — Deployed TWR Apex Argo profiling float 9007, WMO ID 1901928, on 21 Feb 2021.
Subsurface temperature and salinity measurements56° 9' 24" S  57° 36' 42" W — Deployed TWR Apex Argo profiling float 8575, WMO ID 1901925, on 3 Mar 2021.
Current meters52° 48' 29" S  40° 6' 47" W — Recovered mooring P3 on 5 Feb 2021; deployed 11 Dec 2019 on cruise JR19001.. TRDI Workhorse Sentinel 300-kHz ADCP at 200 m depth. SeaBird SBE-37 CTD at 200 m depth. AquaMonitor WMS-4D water sampler at 440 m depth. AADI Seaguard current meter + O2 at 442 m depth. SeaBird SBE-37 CTD at 450 m depth. McLane sediment trap at 2000 m depth. AADI SeaGuard current meter + O2 at 2002 m depth
Current meters52° 48' 29" S  40° 6' 54" W — Deployed mooring P3 on 11 Feb 2021. TRDI Workhorse Sentinel 300-kHz ADCP at 200 m depth. SeaBird SBE-37 CTD at 200 m depth. Sunburst pH monitor at 200 m depth. Develogic SonoVault acoustic recorder at 450 m depth. McLane sediment trap at 900 m depth. AADI Seaguard current meter + O2 at 902 m depth. SeaBird SBE-37 CTD at 950 m depth. McLane sediment trap at 2000 m depth. AADI SeaGuard current meter + O2 at 2002 m depth
Current meters53° 47' 53" S  37° 56' 12" W — Deployed mooring WCB on 9 Feb 2021. Kongsberg WBAT echo sounder at 200 m depth. TRDI Workhorse Sentinel 300-kHz ADCP at 200 m depth. SeaBird SBE-37 CTD at 200 m depth. McLane sediment trap at 250 m depth. Nortek Aquadopp current meter at 252 m depth. Develogic SonoVault acoustic recorder at 255 m depth
Current profiler (eg ADCP)53° 47' 53" S  37° 56' 12" W — Deployed mooring WCB on 9 Feb 2021. Kongsberg WBAT echo sounder at 200 m depth. TRDI Workhorse Sentinel 300-kHz ADCP at 200 m depth. SeaBird SBE-37 CTD at 200 m depth. McLane sediment trap at 250 m depth. Nortek Aquadopp current meter at 252 m depth. Develogic SonoVault acoustic recorder at 255 m depth
Current profiler (eg ADCP)53° 47' 53" S  37° 56' 6" W — Recovered mooring WCB on 7 Feb 2021; deployed 10 Dec 2019 on cruise JR19001.. Kongsberg WBAT echo sounder at 200 m depth. TRDI Workhorse Sentinel 300-kHz ADCP at 200 m depth. Ocean Instruments SoundTrap ST300 acoustic recorder at 200 m depth. SeaBird SBE-37 CTD at 200 m depth. Develogic SonoVault acoustic recorder at 250 m depth
Current profiler (eg ADCP)52° 48' 29" S  40° 6' 47" W — Recovered mooring P3 on 5 Feb 2021; deployed 11 Dec 2019 on cruise JR19001.. TRDI Workhorse Sentinel 300-kHz ADCP at 200 m depth. SeaBird SBE-37 CTD at 200 m depth. AquaMonitor WMS-4D water sampler at 440 m depth. AADI Seaguard current meter + O2 at 442 m depth. SeaBird SBE-37 CTD at 450 m depth. McLane sediment trap at 2000 m depth. AADI SeaGuard current meter + O2 at 2002 m depth
Current profiler (eg ADCP)52° 48' 29" S  40° 6' 54" W — Deployed mooring P3 on 11 Feb 2021. TRDI Workhorse Sentinel 300-kHz ADCP at 200 m depth. SeaBird SBE-37 CTD at 200 m depth. Sunburst pH monitor at 200 m depth. Develogic SonoVault acoustic recorder at 450 m depth. McLane sediment trap at 900 m depth. AADI Seaguard current meter + O2 at 902 m depth. SeaBird SBE-37 CTD at 950 m depth. McLane sediment trap at 2000 m depth. AADI SeaGuard current meter + O2 at 2002 m depth
Neutrally buoyant floats58° 22' 0" S  56° 13' 23" W — Deployed TWR Apex Argo profiling float 8576, WMO ID 1901926, on 2 Mar 2021.
Neutrally buoyant floats63° 4' 59" S  30° 6' 0" W — Deployed TWR Apex Argo profiling float 8991, WMO ID 1901927, on 24 Feb 2021.
Neutrally buoyant floats56° 9' 24" S  57° 36' 42" W — Deployed TWR Apex Argo profiling float 8575, WMO ID 1901925, on 3 Mar 2021.
Neutrally buoyant floats61° 33' 6" S  31° 6' 6" W — Deployed TWR Apex Argo profiling float 9007, WMO ID 1901928, on 21 Feb 2021.
Other physical oceanographic measurements56° 58' 36" S  34° 40' 12" W — Deployed TWR Slocum G2 glider 405 on 14 Feb 2021.. Instrumentation: SeaBird glider CTD, ECO Puck combined Chl A / CDOM fluorometer + backscatter
Other physical oceanographic measurements52° 48' 29" S  40° 6' 54" W — Deployed mooring P3 on 11 Feb 2021. TRDI Workhorse Sentinel 300-kHz ADCP at 200 m depth. SeaBird SBE-37 CTD at 200 m depth. Sunburst pH monitor at 200 m depth. Develogic SonoVault acoustic recorder at 450 m depth. McLane sediment trap at 900 m depth. AADI Seaguard current meter + O2 at 902 m depth. SeaBird SBE-37 CTD at 950 m depth. McLane sediment trap at 2000 m depth. AADI SeaGuard current meter + O2 at 2002 m depth
Other physical oceanographic measurements53° 47' 53" S  37° 56' 12" W — Deployed mooring WCB on 9 Feb 2021. Kongsberg WBAT echo sounder at 200 m depth. TRDI Workhorse Sentinel 300-kHz ADCP at 200 m depth. SeaBird SBE-37 CTD at 200 m depth. McLane sediment trap at 250 m depth. Nortek Aquadopp current meter at 252 m depth. Develogic SonoVault acoustic recorder at 255 m depth
Other physical oceanographic measurements53° 47' 53" S  37° 56' 6" W — Recovered mooring WCB on 7 Feb 2021; deployed 10 Dec 2019 on cruise JR19001.. Kongsberg WBAT echo sounder at 200 m depth. TRDI Workhorse Sentinel 300-kHz ADCP at 200 m depth. Ocean Instruments SoundTrap ST300 acoustic recorder at 200 m depth. SeaBird SBE-37 CTD at 200 m depth. Develogic SonoVault acoustic recorder at 250 m depth
Other physical oceanographic measurements52° 48' 29" S  40° 6' 47" W — Recovered mooring P3 on 5 Feb 2021; deployed 11 Dec 2019 on cruise JR19001.. TRDI Workhorse Sentinel 300-kHz ADCP at 200 m depth. SeaBird SBE-37 CTD at 200 m depth. AquaMonitor WMS-4D water sampler at 440 m depth. AADI Seaguard current meter + O2 at 442 m depth. SeaBird SBE-37 CTD at 450 m depth. McLane sediment trap at 2000 m depth. AADI SeaGuard current meter + O2 at 2002 m depth
Other physical oceanographic measurements56° 14' 12" S  34° 38' 59" W — Deployed TWR Slocum G2 glider 439 on 15 Feb 2021.. Instrumentation: SeaBird glider CTD, ECO Puck combined Chl A / CDOM fluorometer + backscatter
Chemical oceanography 
Oxygen52° 48' 29" S  40° 6' 47" W — Recovered mooring P3 on 5 Feb 2021; deployed 11 Dec 2019 on cruise JR19001.. TRDI Workhorse Sentinel 300-kHz ADCP at 200 m depth. SeaBird SBE-37 CTD at 200 m depth. AquaMonitor WMS-4D water sampler at 440 m depth. AADI Seaguard current meter + O2 at 442 m depth. SeaBird SBE-37 CTD at 450 m depth. McLane sediment trap at 2000 m depth. AADI SeaGuard current meter + O2 at 2002 m depth
Oxygen52° 48' 29" S  40° 6' 54" W — Deployed mooring P3 on 11 Feb 2021. TRDI Workhorse Sentinel 300-kHz ADCP at 200 m depth. SeaBird SBE-37 CTD at 200 m depth. Sunburst pH monitor at 200 m depth. Develogic SonoVault acoustic recorder at 450 m depth. McLane sediment trap at 900 m depth. AADI Seaguard current meter + O2 at 902 m depth. SeaBird SBE-37 CTD at 950 m depth. McLane sediment trap at 2000 m depth. AADI SeaGuard current meter + O2 at 2002 m depth
pH52° 48' 29" S  40° 6' 54" W — Deployed mooring P3 on 11 Feb 2021. TRDI Workhorse Sentinel 300-kHz ADCP at 200 m depth. SeaBird SBE-37 CTD at 200 m depth. Sunburst pH monitor at 200 m depth. Develogic SonoVault acoustic recorder at 450 m depth. McLane sediment trap at 900 m depth. AADI Seaguard current meter + O2 at 902 m depth. SeaBird SBE-37 CTD at 950 m depth. McLane sediment trap at 2000 m depth. AADI SeaGuard current meter + O2 at 2002 m depth
Other chemical oceanographic measurements52° 48' 29" S  40° 6' 54" W — Deployed mooring P3 on 11 Feb 2021. TRDI Workhorse Sentinel 300-kHz ADCP at 200 m depth. SeaBird SBE-37 CTD at 200 m depth. Sunburst pH monitor at 200 m depth. Develogic SonoVault acoustic recorder at 450 m depth. McLane sediment trap at 900 m depth. AADI Seaguard current meter + O2 at 902 m depth. SeaBird SBE-37 CTD at 950 m depth. McLane sediment trap at 2000 m depth. AADI SeaGuard current meter + O2 at 2002 m depth
Other chemical oceanographic measurements52° 48' 29" S  40° 6' 47" W — Recovered mooring P3 on 5 Feb 2021; deployed 11 Dec 2019 on cruise JR19001.. TRDI Workhorse Sentinel 300-kHz ADCP at 200 m depth. SeaBird SBE-37 CTD at 200 m depth. AquaMonitor WMS-4D water sampler at 440 m depth. AADI Seaguard current meter + O2 at 442 m depth. SeaBird SBE-37 CTD at 450 m depth. McLane sediment trap at 2000 m depth. AADI SeaGuard current meter + O2 at 2002 m depth
Biology and fisheries 
Phytoplankton pigs (eg chlorophyll, fluorescence)56° 14' 12" S  34° 38' 59" W — Deployed TWR Slocum G2 glider 439 on 15 Feb 2021.. Instrumentation: SeaBird glider CTD, ECO Puck combined Chl A / CDOM fluorometer + backscatter
Phytoplankton pigs (eg chlorophyll, fluorescence)56° 58' 36" S  34° 40' 12" W — Deployed TWR Slocum G2 glider 405 on 14 Feb 2021.. Instrumentation: SeaBird glider CTD, ECO Puck combined Chl A / CDOM fluorometer + backscatter
Sediment traps52° 48' 29" S  40° 6' 47" W — Recovered mooring P3 on 5 Feb 2021; deployed 11 Dec 2019 on cruise JR19001.. TRDI Workhorse Sentinel 300-kHz ADCP at 200 m depth. SeaBird SBE-37 CTD at 200 m depth. AquaMonitor WMS-4D water sampler at 440 m depth. AADI Seaguard current meter + O2 at 442 m depth. SeaBird SBE-37 CTD at 450 m depth. McLane sediment trap at 2000 m depth. AADI SeaGuard current meter + O2 at 2002 m depth
Sediment traps52° 48' 29" S  40° 6' 54" W — Deployed mooring P3 on 11 Feb 2021. TRDI Workhorse Sentinel 300-kHz ADCP at 200 m depth. SeaBird SBE-37 CTD at 200 m depth. Sunburst pH monitor at 200 m depth. Develogic SonoVault acoustic recorder at 450 m depth. McLane sediment trap at 900 m depth. AADI Seaguard current meter + O2 at 902 m depth. SeaBird SBE-37 CTD at 950 m depth. McLane sediment trap at 2000 m depth. AADI SeaGuard current meter + O2 at 2002 m depth
Acoustic reflection on marine organisms.53° 47' 53" S  37° 56' 12" W — Deployed mooring WCB on 9 Feb 2021. Kongsberg WBAT echo sounder at 200 m depth. TRDI Workhorse Sentinel 300-kHz ADCP at 200 m depth. SeaBird SBE-37 CTD at 200 m depth. McLane sediment trap at 250 m depth. Nortek Aquadopp current meter at 252 m depth. Develogic SonoVault acoustic recorder at 255 m depth
Acoustic reflection on marine organisms.53° 47' 53" S  37° 56' 6" W — Recovered mooring WCB on 7 Feb 2021; deployed 10 Dec 2019 on cruise JR19001.. Kongsberg WBAT echo sounder at 200 m depth. TRDI Workhorse Sentinel 300-kHz ADCP at 200 m depth. Ocean Instruments SoundTrap ST300 acoustic recorder at 200 m depth. SeaBird SBE-37 CTD at 200 m depth. Develogic SonoVault acoustic recorder at 250 m depth
Other biological/fisheries measurement53° 47' 53" S  37° 56' 6" W — Recovered mooring WCB on 7 Feb 2021; deployed 10 Dec 2019 on cruise JR19001.. Kongsberg WBAT echo sounder at 200 m depth. TRDI Workhorse Sentinel 300-kHz ADCP at 200 m depth. Ocean Instruments SoundTrap ST300 acoustic recorder at 200 m depth. SeaBird SBE-37 CTD at 200 m depth. Develogic SonoVault acoustic recorder at 250 m depth
Other biological/fisheries measurement52° 48' 29" S  40° 6' 54" W — Deployed mooring P3 on 11 Feb 2021. TRDI Workhorse Sentinel 300-kHz ADCP at 200 m depth. SeaBird SBE-37 CTD at 200 m depth. Sunburst pH monitor at 200 m depth. Develogic SonoVault acoustic recorder at 450 m depth. McLane sediment trap at 900 m depth. AADI Seaguard current meter + O2 at 902 m depth. SeaBird SBE-37 CTD at 950 m depth. McLane sediment trap at 2000 m depth. AADI SeaGuard current meter + O2 at 2002 m depth
Other biological/fisheries measurement53° 47' 53" S  37° 56' 12" W — Deployed mooring WCB on 9 Feb 2021. Kongsberg WBAT echo sounder at 200 m depth. TRDI Workhorse Sentinel 300-kHz ADCP at 200 m depth. SeaBird SBE-37 CTD at 200 m depth. McLane sediment trap at 250 m depth. Nortek Aquadopp current meter at 252 m depth. Develogic SonoVault acoustic recorder at 255 m depth