FOCUS/SWOT-ACC Harmonised Multi-platform Data Product
README
Version 1.0

Dataset
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Inter-calibrated multi-platform oceanographic observations from the FOCUS/SWOT-ACC voyage (IN2023_V07), Southern Ocean, 2023–2024.

Overview
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This data product brings together hydrographic and biogeochemical observations collected during the FOCUS/SWOT-ACC observing program. It includes ship-based CTD and Triaxus observations together with Seaglider, EM-APEX and BGC-Argo data.

The source datasets underwent platform-specific processing and quality control before inclusion in this product. Additional harmonisation and inter-calibration were applied where required to improve cross-platform consistency. Platform-specific processing details are provided in the accompanying README files and technical report.

Included platforms
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- CTD
- Triaxus
- Seaglider
- EM-APEX
- BGC-Argo

Processing summary
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- CTD: original processed profiles retained; dissolved oxygen mass concentration variables were added using TEOS-10 in-situ density.
- Triaxus: original processed data retained with additional dissolved oxygen inter-calibration.
- Seaglider: cross-platform corrections applied where systematic offsets were identified.
- EM-APEX: FOCUS floats f10317 and f10331 were subset from the SQUID gridded product; empty coordinate placeholders were converted to missing values, and two anomalous f10331 observations were excluded.
- BGC-Argo: WMO 5905555 and 5905556 were subset through 25 March 2024. All retained profiles are delayed-mode data; original adjusted variables, QC flags and metadata were preserved.

No additional scientific corrections were applied unless documented in the corresponding platform README or processing report.

Documentation
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Each platform directory contains a README describing the source data and processing applied to that component.

Detailed processing, inter-calibration methods, validation and provenance are documented in:

FOCUS_SWOT_ACC_Data_Processing_and_Intercalibration_Report_v1.0.pdf

Original CTD and Triaxus source-processing procedures are documented in the corresponding CSIRO processing reports. These reports are referenced in the technical report and source metadata but are not redistributed as part of this data product.

Data use
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Users should consult the NetCDF global and variable attributes, platform-specific README files, and the processing report before analysis. Original source-data acknowledgements and provenance should be retained when using or redistributing derived products.

Citation and DOI
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Please use the citation and DOI provided in the repository record for this data product.

License
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Please refer to the repository record for the applicable licence.

Version
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v1.0