All data acquired with sensors mounted on a bottom lander ~30 cm above the seafloor unless noted otherwise.

Problems/Issues:
The temperature data were collected at lower frequencies and in the OC1901 Ev51 case processed with a 15 min moving average to interpolate to 8 Hz.

Instrument summary:

Nortek Vector ADV (yielded u, v, w, P, BSI).

Pyroscience fiber-optic oxygen sensors (OXB430) (yielded O2). The fiber-optic sensors were activated through PyroScience FireStingO2-Subport modules enclosed in Delrin housings with 12V to 5V power converter circuits produced and integrated by Rockland Scientific (Victoria, BC, Canada).

A new fiber-optic sensor was installed for each EC experiment, and it was calibrated in seawater solutions at 0 and 100% air saturation using FirestingO2 software, before and after each deployment. When processing EC data records the specific Firesting “pre” and “post” calibration parameters were applied with time-series inputs of temperature, salinity and pressure to convert the sensor measurements to two parallel O2 time-series in units of mmol L-1. Because it was observed that the fiber-optic sensor calibrations shifted gradually over time, independent reference measurements (from OOI data products or ship-based casts) were used to derive corrected fiber-optic time-series based on the fractions of pre- and post-calibration series needed to align with the reference measurements. For each deployment, four reference points were assigned, with calibration proportions extrapolated in between each reference point. Not surprisingly, these fractions shifted from mostly dependent on the “pre” calibration to dominantly the “post” calibration over the course of each deployment. Adjustments in mean concentration were generally about 10%.

Temperature records were extracted from the neighboring OOI Benthic Experimental Package CTD when at the 80 m station. Temperature records were measured with a recording CTD (SBE 37) during deployments at 30 m.