Dissolved nutrient and particulate material concentrations and phytoplankton abundance and community composition from cruise JC211 to South Georgia, Southern Ocean, February 2021

Marine macronutrient and particulate material concentrations together with phytoplankton abundance and community composition were measured from samples taken during British Antarctic Survey and UK National Oceanography Centre research cruise JC211 to the Scotia Sea, Southern Ocean, carried out onboard RRS James Cook in February-March 2021. Samples were taken from four sections of the cruise: (i) at the British Antarctic Survey Scotia Sea Open-Ocean Observatory (SCOOBIES) P3 mooring in the Georgia Basin, northwest of South Georgia; (ii) as part of the British Antarctic Survey long-term Polar Ocean Ecosystem Time Series - Western Core Box (POETS-WCB) survey at South Georgia; (iii) in the vicinity of giant iceberg A-68A and associated icebergs; and (iv) as part of the A23 repeat hydrographic section. Samples were collected to maximum depth of approximately 500 m from Niskin water bottles attached to a CTD rosette. Full data analyses were performed post-cruise. Concurrent temperature, salinity, dissolved oxygen, chlorophyll fluorescence and photosynthetically active radiation (PAR) measurements obtained from analysis of water samples and from sensors on the CTD system at the depth and time of each water sample are provided for environmental context.

RRS James Cook cruise JC211 was in part supported by the Natural Environment Research Council (NERC) National Capability Science (Antarctic Logistics and Infrastructure; NC-ALI) programme. Further funding for sampling around iceberg A-68 was provided by the Government of South Georgia and the South Sandwich Islands and the UK Government Blue Belt Programme. Data acquisition and analyses were supported by NERC NC-ALI funding to the Ecosystems CONSEC Programme and NERC Grants NE/N018095/1 (ORCHESTRA) and NE/V013254/1 (ENCORE) at the British Antarctic Survey, and by the European Research Council (ERC Starting Grant 678371 ICY-LAB to K Hendry) and NERC Grant NE/K010034/1 (to SF Henley).

Alternate title: Polar Data Centre (PDC) record GB/NERC/BAS/PDC/01852

Date (Publication): 2024-05-23

Citation identifier: http://www.antarctica.ac.uk/dms/metadata.php?id= / GB/NERC/BAS/PDC/01852

Point of contact

Organisation name	Individual name	Electronic mail address	Role
British Antarctic Survey		pdc@bas.ac.uk	Custodian
NERC EDS UK Polar Data Centre	Abrahamsen, P., Tarling, G., Firing, Y., King, B., Marzocchi, A., Burson, A., Hendry, K., Henley, S., Liszka, C., Manno, C., Ward, F., Woodward, M., Wootton, M., Brunetta, M., Song, Y., & Thorpe, S.	pdc@bas.ac.uk	Originator

Maintenance and update frequency: Unknown

Keywords

NDGO0001

NERC OAI Harvesting

NERC_DDC

GCMD Parameter Valids

EARTH SCIENCE > Oceans > Marine Environment Monitoring
EARTH SCIENCE > Oceans > Ocean Chemistry > Ammonia
EARTH SCIENCE > Oceans > Ocean Chemistry > Nitrate
EARTH SCIENCE > Oceans > Ocean Chemistry > Nitrite
EARTH SCIENCE > Oceans > Ocean Chemistry > Organic Carbon
EARTH SCIENCE > Oceans > Ocean Chemistry > Phosphate
EARTH SCIENCE > Oceans > Ocean Chemistry > Silicate

BAS Free-text keywords

Antarctica
South Georgia
Southern Ocean
iceberg, A-68
nutrients
particulate nitrogen
particulate organic carbon
particulate silica
phytoplankton abundance
phytoplankton community composition

Use limitation: This data is governed by the NERC data policy and supplied under Open Government Licence v.3 http://www.nationalarchives.gov.uk/doc/open-government-licence/version/3/.

Access constraints: Other restrictions

Other constraints: This data is governed by the NERC data policy and supplied under Open Government Licence v.3 http://www.nationalarchives.gov.uk/doc/open-government-licence/version/3/.

Language: English

Topic category

Biota
Environment
Oceans

Begin date: 2021-02-04

End date: 2021-02-17

Reference system identifier: OGP / urn:ogc:def:crs:EPSG::4326

Distribution format

Distributor contact

Organisation name	Individual name	Electronic mail address	Role
Polar Data Centre - British Antarctic Survey		pdc@bas.ac.uk	Distributor

OnLine resource

Protocol	Linkage	Name
http		GET DATA

Hierarchy level: Dataset

Domain consistency

Measure identification: INSPIRE / Conformity_001

Conformance result

Title: INSPIRE Data Specification on unknown theme Guidelines

Date

Explanation: See the referenced specification

Pass: No

Statement: Nutrient calibration standards were prepared with low-nutrient seawater and the analyses were quality controlled and checked using Certified Reference Materials (CRMs) for nutrients in seawater from KANSO Ltd. (Japan). Raw data were further corrected to ambient ocean salinity and pH. Samples were analysed in duplicate and standard deviation was generally better than 0.02 µmol L-1 for nitrate+nitrite, 0.01 µmol L-1 for nitrite, 0.02 µmol L-1 for phosphate, 0.06 µmol L-1 for silicic acid and 0.05 µmol L-1 for ammonium.

Analytical precision was better than 1.0 % for particulate organic carbon (POC) and 1.1 % for particulate nitrogen.

Analytical precision for particulate silica was better than 3 %, and full replicates of sample aliquots taken through the dissolution process separately agreed within 8 %. Laboratory blanks were below the detection limit (0.01 mg L-1).

The standard deviation in practical salinity differences between the bottle and sensor values was less than 0.0015.

Dissolved oxygen samples had residual errors, and differences between downcasts and upcasts, generally within 1 µmol kg-1.

Chlorophyll fluorescence data from the CTD had the factory calibration applied, but no calibration against in situ samples.

NaN is used to indicate any bottle samples where a particular parameter was not measured.

The following variables have WOCE data quality flags of 2 (acceptable measurement), 3 (questionable measurement), 4 (bad measurement), 5 (not reported), 9 (not sampled):

- Salinity from sample measurement

- Dissolved oxygen from sample measurement

Manual flagging was not performed for the salinity samples; the flags merely indicate the presence (or absence) or samples. For dissolved oxygen samples, the use of these flags is described in more detail in the cruise report (Abrahamsen, 2021).