CTD profiles from marine conservation areas and offshore locations around Newfoundland and Labrador (2023–2025)

Sampling sites include four formally designated marine closures (Hawke Channel, Funk Island Deep, Northeast Newfoundland Slope, and Division 3O Coral) as well as additional locations in Hermitage Bay and along the boundary of NAFO divisions 3Ps and 3L. CTD profiles were collected using a SBE 19plus V2 Seacat CTD equipped with a WET Labs ECO-AFL/FL fluorometer. In 2025, a SBE 43 oxygen sensor was added to the configuration.

The CTD unit was deployed using a hydraulic winch from the stern of the vessel and operated at a descent rate of 0.5–1 m/s. The instrument sampled at 4 Hz and was held at the surface for two minutes before descent. Standard Sea-Bird data processing routines (v7.26.7) were applied, including conversion, alignment, thermal correction, and derived variable calculations.

Further data formatting and quality checks were performed using the `oce` package in R. All files are provided in CSV format.