ASTAN cardinal buoy (western English Channel, France) data from 2015 to 2019

This database consists of several time series recorded at 30-minute intervals on the ASTAN cardinal buoy, located 3.1 km offshore from Roscoff in the western English Channel (France). It was originally developed by Gac et al. (2020, DOI:10.3389/fmars.2020.00712). The present version corresponds to the dataset used in Robache and Schmitt (2025, DOI:10.5194/egusphere-2025-972). Sea surface temperature (SST, °C) and salinity (SSS, psu) were recorded using a SeaBird Inc. SBE16+ sensor. Dissolved Oxygen (DO) and chlorophyll a (chl a, µg L-1) concentrations were respectively recorded with a SeaBird Inc. SBE43 sensor and a Cyclops7 sensor. Oxygen saturation (Osat, %) was estimated by Gac et al. (2020) following the method of Weiss (1970, DOI: 10.1016/0011-7471(70)90037-9). Atmospheric pressure (Patm, hPa) data were obtained from the weather station at the Roscoff Marine Station. The seawater surface partial pressure of CO2 (pCO2, µatm) data was collected on the buoy using a SAMI-CO2 sensor (SunBurst Sensors).