CTD General Practices: System Description, Deployment, Data Aquisition, & Maintenance.
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Since 1993, the CalCOFI program has deployed a Seabird 911 CTD mounted on a 24-bottle rosette during seasonal, quarterly cruises off California. The CTD-rosette is lowered into the ocean to 515m, depth-permitting, on 75 hydrographic stations using the ship's conductive-wire winch. Data from the sensors are transmitted up the conductive wire and displayed real-time on a data acquistion computer. Discrete seawater samples are collected in 10L bottles at specific depths determined by the chlorophyll maximum and mixed layer depth. These samples are analyzed at sea and used to assess the CTD sensor data quality plus measure additional properties. Processed CTD sensor data are compared to the seawater sample data and corrected when necessary. Preliminary data are available on CalCOFI's website, calcofi.org, while the cruise is at sea when internet is available. Preliminary processed data files are online shortly after the cruise returns. Final, publication-quality bottle & CTD data are avail.....
PublisherCalifornia Cooperative Oceanic Fisheries Investigation
La Jolla, CA
Sustainable Development Goals (SDG)14.a
Essential Ocean Variables (EOV)Subsurface temperature
Sea surface temperature
Spatial CoverageCalifornia waters
Northeast Pacific Ocean
CitationCalCOFI (2017) CTD General Practices: System Description, Deployment, Data Aquisition, & Maintenance. La Jolla, CA, California Cooperative Oceanic Fisheries Investigation, 6pp. DOI: http://dx.doi.org/10.25607/OBP-1588
- CalCOFI Methods 
Except where otherwise noted, this item's license is described as http://creativecommons.org/publicdomain/zero/1.0/