[Dissolved Oxygen - Irminger Sea] - Calibrated dissolved oxygen time series at the Ocean Observatories Initiative’s Irminger Sea Array from 2014 to 2022 (CAREER: Constraining the high-latitude ocean carbon cycle: Leveraging the Ocean Observatories Initiative (OOI) Global Arrays as marine biogeochemical time series)

Optodes on the wire-following profilers (WFP) were calibrated using the “deep isotherm approach”, which assumes that oxygen remains stable on a deep isotherm over time. We used bottle-calibrated profiles from turn-around cruises to determine the oxygen concentration on a deep, stable isotherm.

Oxygen optodes on the WFP were then calibrated to this concentration as they passed through this isotherm during each profile. This calibration was then passed on to oxygen data collected by gliders transiting the array. Starting in 2018, we include surface mixed-layer dissolved oxygen data that were calibrated based on turn-around cruise measurements at the beginning and end of each sensor deployment.