This repository contains a MATLAB workflow for processing first- and second-year sea-ice salinity, temperature, and density observations collected at coring sites during the CONTRASTS expedition (PS149) aboard R/V Polarstern in July–August 2025.

The workflow imports field and laboratory measurements, performs quality control, interpolates temperature observations to density-core depths, calculates in situ sea-ice density, and derives relative brine and gas volume fractions following Cox and Weeks (1983) and Leppäranta and Manninen (1988). The processed datasets are exported in MATLAB (.mat), Excel (.xlsx), and CF-compliant NetCDF (.nc) formats.

The workflow reproduces the published sea-ice salinity, temperature, and density datasets archived at PANGAEA and provides a transparent and reproducible processing chain from raw observations to final data products. The repository includes scripts for data import, processing, NetCDF export, figure generation, and optional downstream analyses.

Version 2.0.0 introduces an improved repository structure with dedicated directories for scripts, data products, figures, and analyses, together with expanded documentation and workflow descriptions. The underlying processing algorithms, quality-control procedures, and scientific calculations are unchanged relative to previous releases.

Associated datasets:

• Sea-ice density: https://doi.pangaea.de/10.1594/PANGAEA.993687

• Sea-ice salinity: https://doi.pangaea.de/10.1594/PANGAEA.993703

• Sea-ice temperature: https://doi.pangaea.de/10.1594/PANGAEA.993704