IMAS Metadata Catalogue
IN2023_V01 POC and biogenic silica from 2 CTD stations
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 particulate organic carbon and biogenic silica from two CTD casts conducted in the Cape Darnley region. The voyage was terminated after a medical evacuation so only two CTD stations were occupied. These data were generated by IMAS Honour student Veda Surapaneni, and were included in her honours thesis. The dataset also includes hydrochemistry, DIC, Alkalinity and pigment data generated by CSIRO, although these data are published in other national repositories and reproduced here for completeness and convenience only.
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/NRRH-RK47
- 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 by the 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
))
Temporal extent
- Time period
- 2023-02-08 2023-02-08
Vertical element
- Minimum value
- 0
- Maximum value
- 3544
- Identifier
- EPSG::5715
- Name
- MSL depth
- 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 2 CTD stations [Dataset]. Institute for Marine and Antarctic Studies. https://doi.org/10.25959/NRRH-RK47
- Language
- English
- Character encoding
- UTF8
Content Information
- Content type
- Physical measurement
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
Resource lineage
- Statement
- Samples were collected at both CTD stations within the Cape Darnley survey area to characterise the biogeochemistry. This sampling also provided sensor comparison data for the two BGC-Argo floats deployed in the area. Briefly, we collected samples for DIC and Alkalinity, which were preserved in HgCl2, samples for nutrients and oxygen from every depth (analysed by MNF Hydrochemistry team on board), and samples for Particulate Organic Carbon (POC) and Pigments. In addition, the IMAS group collected samples for biogenic Si (bSi) analysis. All particulate samples (POC, pigments and bSi) were collected using in-line filtration directly from the Niskin bottles. POC was collected on 13mm pre-combusted QMA filters, pigments on 25mm GFF filters and bSi on 25mm acrylic co-polymer filters (1.2𝜇m pore size). Blank samples for POC were collected at both stations by setting up to sample a deep bottle and briefly turning on the pump. POC and pigment samples were stored at -80°C while bSi samples were stored at -20°C. 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 Hydrochemistry analyses were conducted on board by the CSIRO hydrochemistry team. Samples were collected from Niskin bottles sampled at various depths during CTD deployments. The following parameters were analysed: salinity, dissolved oxygen, phosphate, silicate, nitrate, nitrite and ammonium. Quality-controlled data is accessible via the Marlin data portal: https://marlin.csiro.au/geonetwork/srv/eng/catalog.search#/metadata/b472359a-5720-4ff3-8c1f-9a34d79a149a
- Hierarchy level
- Dataset
- Hierarchy level
- Dataset
Metadata
- Metadata identifier
- urn:uuid/beb48c00-a8c2-4772-8eb2-91da9c288bdb
- 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/beb48c00-a8c2-4772-8eb2-91da9c288bdb
Point of truth URL of this metadata record
- Date info (Creation)
- 2026-07-24T00:00:00
- Date info (Revision)
- 2026-07-31T16:54:06
Metadata standard
- Title
- ISO 19115-3:2018
Overviews
Spatial extent
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