IMAS Metadata Catalogue
IN2023_V01 POC and biogenic silica from underway samples
The CANYONS voyage on RV Investigator aimed to investigate past and present processes governing the flow pathways, formation and geochemical signatures of Antarctic Bottom Water (AABW) off Cape Darnley, East Antarctica. The proposed survey area was focussed on the Wild and Daly canyons and the adjacent sediment drifts - the Daly and ‘Armand’ drifts. The survey aimed to collect systematic multibeam bathymetry and sub-bottom profiles across the region to support collection of long sediment cores (up to 24 m), Kasten cores and multicores, CTDs (conductivity- temperature-depth instruments) and deep towed camera transects
This dataset reports analyses of samples collected from the surface uncontaminated "underway" seawater supply on R/V Investigator. The samples were collected while the ship transited from Perth to Cape Darnley. A suite of samples were collected in order to characterise surface ocean particles across the oceanographic gradients that characterise the Southern Ocean. these data were generated by IMAS Honour student Veda Surapaneni, and were included in her honours thesis.
Simple
Identification info
- Date (Publication)
- 2026-07-31T00:00:00
Identifier
- Title
- Information and documentation - Digital object identifier system
- Citation identifier
- ISO 26324:2012
- Code
- 10.25959/K8V3-AE38
- Codespace
- doi.org
- Description
- Digital Object Identifier (DOI)
Principal investigator
Principal investigator
- Credit
- This research was supported by a grant of sea time on RV Investigator from the CSIRO Marine National Facility (https://ror.org/01mae9353) and the Australian Research Council Special Research Initiative, Australian Centre for Excellence in Antarctic Science (ACEAS) (Project Number SR200100008).
- Status
- Completed
Point of contact
- Topic category
-
- Oceans
Extent
N
S
E
W
))
Temporal extent
- Time period
- 2023-01-26 2023-02-24
- Maintenance and update frequency
- Not planned
- Keywords (Theme)
-
- CANYONS
- Global Change Master Directory Earth Science Keywords, Version 8.5
Resource constraints
- Linkage
-
https://licensebuttons.net/l/by/4.0/88x31.png
License Graphic
- Title
- Creative Commons Attribution 4.0 International License
- Alternate title
- CC-BY
- Edition
- 4.0
- Website
-
https://creativecommons.org/licenses/by/4.0/
License Text
- Other constraints
- Cite data as: Surapaneni, V., & Chase, Z. (2026). IN2023_V01 POC and biogenic silica from underway samples [Dataset]. Institute for Marine and Antarctic Studies. https://doi.org/10.25959/K8V3-AE38
- Language
- English
- Character encoding
- UTF8
Content Information
- Content type
- Physical measurement
Identifier
- Name
- CHL
- Identifier
- http://vocab.nerc.ac.uk/collection/P06/current/UMMC
- Name
- Milligrams per cubic metre
Identifier
- Code
- particulate organic carbon
- Name
- POC
- Identifier
- http://vocab.nerc.ac.uk/collection/P06/current/UPOX
- Name
- Micromoles per litre
Identifier
- Code
- biogenic silica
- Name
- bSi
- Identifier
- http://vocab.nerc.ac.uk/collection/P06/current/UPOX
- Name
- Micromoles per litre
Distribution Information
- Distribution format
-
- Microsoft Excel
Resource lineage
- Statement
- Thirty-one underway stations were sampled along the transit from Perth to the Cape Darnley survey area for radiogenic isotopes (Th, Pa, Nd and Pb), particulates, chlorophyll, biogenic silica and particulate organic carbon. Underway sampling was carried out approximately every 8 hours in the Underway Lab using both the trace metal clean supply (left hand sink) and the seawater supply (right hand sink). The trace metal clean seawater was pumped from the inlet in the drop keel via an air operated Wilden diaphragm pump. The pump does not run continuously like the regular seawater supply, so required the engineers to start this prior to sampling. The Underway Trace Metal outlet was left open for ~30 minutes prior to sampling. A second trace metal seawater tap always needs to remain open so that the tap in the Underway Lab can be opened and closed without over pressurising the pump. The trace metal seawater tap was left open in the Clean Wet Lab with a tube connecting the outlet to the drain in the sink (Figure 34). Two people were involved in the underway sampling, one to filter the seawater (detailed below) for 10 L, 5 L and 250 mL bottles and the large inline filter, and the other to undertake the biogeochemical sampling; filtering seawater for chlorophyll (250 – 1000 mL), biogenic silica (≥1000 mL) and particulate organic carbon (POC; 2000 – 4000 mL). A plastic bubble was set up in the Clean Wet Lab to process the underway filters. Three nutrient samples were taken first by rinsing three times and filling 10 mL tubes supplied by hydrochemistry to ~7 mL, which were then placed into a polystyrene tray in the Hydrochemistry Lab freezer. For the biogeochemical samples, a 5 L jerry can was rinsed three times and filled with seawater from the seawater-intake on the right-hand side. An entry into Everlog was made to record each sample. An e-jet pump and accumulator, which measures the volume pumped through the filters, was set up and the cartridge loaded with the appropriate filter connected between two pieces of PVC tube. For chlorophyll, a 25 mm GF/F filter (pore size 0.8 μm) filtered between 250 – 1000 mL of seawater. The filter was folded in half onto itself and sealed into a square of tinfoil and placed in a Ziplock bag in the -80°C freezer. For biogenic silica a 25 mm acrylic copolymer filter (pore size 1.2 μm) filtered at least 1000 mL of seawater. The filter was placed into a 60 mL tube and preserved in the -20°C freezer. The POC filters were handled carefully, and only loaded and unloaded in a laminar flow hood wearing Tyvek sleeves and vinyl gloves. The POC was sampled using a 13 mm pre-combusted QMA filter (pore size 1 μm), and generally was the slowest to pump through the required volume. After each filtration air was pumped through the filter prior to opening the cartridge to prevent loss of the sample, and the filtration volume measured and recorded. Chlorophyll-A filters were extracted in 10 mL of 90% acetone and concentration was determined using fluorometric analysis on a Turner Trilogy fluorometer (Strickland & Parsons, 1972). POC filters were placed into a fume hood overnight to be acidified with 2 molar Hydrochloric Acid (HCL 2M). Once acidified the samples were dried for 48 hours at 60°C. The samples were transferred from IMAS to the University of Tasmania Central Science Laboratory for elemental analysis. All metal tools were muffled at 450°C for 4.5h and a laminar flow hood was used. bSi was determined after leaching samples in 0.1M NaOH at 85C. The Si concentration in the leach was determined spctrophotometrically. See Strickland & Parsons, (1972). Strickland, J., & Parsons, T. (1972). A PRACTICAL HANDBOOK OF SEAWATER ANALYSIS
- Hierarchy level
- Dataset
- Hierarchy level
- Dataset
Metadata
- Metadata identifier
- urn:uuid/66654b13-4e6f-489b-9ed4-94103f87e28d
- Language
- English
- Character encoding
- UTF8
Type of resource
- Resource scope
- Dataset
- Name
- IMAS Dataset level record
- Metadata linkage
-
https://metadata.imas.utas.edu.au/geonetwork/srv/eng/catalog.search#/metadata/66654b13-4e6f-489b-9ed4-94103f87e28d
Point of truth URL of this metadata record
- Date info (Creation)
- 2026-07-22T00:00:00
- Date info (Revision)
- 2026-07-31T13:04:58
Metadata standard
- Title
- ISO 19115-3:2018
Overviews
Spatial extent
N
S
E
W
Provided by
Associated resources
Not available