Dataset: OOI Argentine Basin CTD and Water Sampling Data
Deployment: AT39-03

OOI CTD and Discrete Water Sampling Data
View Data: For data, See Dataset Metadata Page:
Chief Scientist: 
Sébastien Bigorre (Woods Hole Oceanographic Institution, WHOI)
Principal Investigator: 
Albert Plueddemann (Woods Hole Oceanographic Institution, WHOI)
Data Manager: 
Andrew Reed (Woods Hole Oceanographic Institution, WHOI)
BCO-DMO Data Manager: 
Sawyer Newman (Woods Hole Oceanographic Institution, WHOI BCO-DMO)

OOI-CGSN CTD Sampling Guidelines

In general, water samples are collected for analysis at depths that correspond to instrumentation making in situ measurements.  For example, Near Surface Instrument Frames (NSIFs) have instrumentation that measure dissolved oxygen (DO), salinity (CTD), nitrate (NUTNR), the partial pressure of CO2 (CO2), and chlorophyll a fluorescence, so water samples should be collected at the depth of the NSIF for analyses of all those parameters.  Additionally, as noted above, OOI water sampling data are valid long-term datasets in and of themselves. Thus, some measurement locations are driven by broader science questions.

Soak Time – The CTD rosette should be allowed to equilibrate (e.g., the CTD sensor readout stabilizes) at the desired target depth for at least 1 minute or more depending on conditions.  Longer soak times may occur to accommodate acoustic release testing or other activities.

Ancillary Sampling – It should also be noted that OOI/CGSN cruises may also include ancillary activities and personnel, such as the Northeast U.S. Shelf Long-Term Ecological Research (NES-LTER) group on Pioneer cruises or the Overturning in the Subpolar North Atlantic Program (OSNAP) on Irminger cruises.  These groups may conduct their own CTD casts, and/or collect water samples on OOI/CGSN CTD casts.  In some cases, they may collect the OOI/CGSN water samples for analysis.  Regardless of who collects the samples, all OOI/CGSN samples (as specified in the sections below) should be noted on the OOI/CGSN sampling logs (3404-00003).  Ancillary samples may be noted on OOI/CGSN sampling logs, but should be identified as part of the ancillary program.

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