The dataset comprises high-resolution (1-min) measurements of dissolved carbon monoxide in surface waters of Lake Grevelingen and Oosterschelde (The Netherlands), which were collected during the expedition N2302 on board R/V Navicula (February-March 2023). Seawater was drawn on board by means of a submersible pump installed at 1 m depth, and measurements of equilibrated headspace were carried out as described in Arévalo-Martínez et al. (2013): https://doi.org/10.5194/os-9-1071-2013.

OA-ICOS Analyzer coupled to shower head equilibrator as in Arévalo-Martínez et al. (2013): https://doi.org/10.5194/os-9-1071-2013.Equilibration temperature measured with a FLUKE 1524 reference thermometer (+/-0.01°C).Sea surface temperature and salinity derived from discrete in-situ measurements with a Seabird SBE 911 plus