Dataset: 2017-2018-2019 BBL_CTD/Rosette
Deployment: OC1904A

These data come from in situ sensor measurements or analyses of water samples collected during a series of cruises on the R/V Oceanus. The ship’s SeaBird CTD system with a rosette of 12 10-L Niskin bottles was deployed for each reported event. Typically water samples were collected in the benthic boundary layer by tripping several Niskins within 4 m of the bottom. Compiled data include the water temperature, salinity and dissolved oxygen (SBE-43 sensor) recorded at the time a bottle was closed. The Niskins were sampled back onboard for Winkler determinations of dissolved oxygen, TCO2/pCO2 samples poisoned, capped and stored in brown glass bottles, nutrient samples (stored frozen until analyses), and water that was filtered onboard onto pre-combusted GF/F filters for determinations of total suspended solids and the organic C and total N content of those solids. Methods details are oxygen concentrations were measured by whole bottle Winkler titration of 125 ml samples using an amperometric method for detecting the triiodide ion reaction endpoints. TCO2 and pCO2 are determined on the same sample by methods described in Hales et al. (2017) [Estuaries and Coasts, vol 40:173-186]. Nutrient samples were stored frozen in acid-washed Nalgene™ 60 ml HDPE bottles until thawed and analyzed using standard colorimetric methods as adapted for autoanalyzers. The POC/PN water samples were immediately filtered through precombusted (at 400°C for 4 h) 25 mm Whatman™ GF/F filters. These filters were frozen at sea then later exposed to acid fumes in the laboratory for 24 h to remove inorganic carbon. Dried filters were analyzed using an elemental analyzer.