CTD General Practices: System Description, Deployment, Data Aquisition, & Maintenance SUMMARY: Since 1993, the CalCOFI program has deployed a Seabird 911 CTD mounted on a 24-bottle rosette during seasonal, quarterly cruises…

 ISUS NITRATE HISTORY   The original methods description was written Feb 2010 by J. Wilkinson.  Changes to the method or instrument are listed below.   Changes Cruise/Ship Date Author Description 1611SR+…

ISUS Nitrate Sensor   SUMMARY: Since November 2004, a Satlantic ISUS nitrate sensor has been integrated with a Seabird 911+ CTD-Rosette system deployed on CalCOFI cruises. Cruises typically occupy 75…

PRIMARY PRODUCTIVITY CHANGES A description of the method was written February 2010 by D. Wolgast.  Changes to the method are listed below. Radioactive Specific Activity Changes Section Date Prepared By…

Salinity Determination OVERVIEW: This procedure describes the method for the determination of seawater salinity using a Guildline Portasal™ Salinometer (Model 8410). 1. Principle During a cruise a 24 bottle rosette is…

DISSOLVED OXYGEN   SUMMARY: The amount of dissolved oxygen in seawater is measured using the Carpenter modification of the Winkler method. Carpenters modification (1965) was designed to increase the accuracy…

Chlorophyll Determination SUMMARY: Chlorophyll a is extracted in an acetone solution. Chlorophyll and phaeopigments are then measured fluorometrically using an acidification technique. 1. Principle Seawater samples of a known volume…

CalCOFI Time Series data are over 67 years old. New adopted practices, methods, software and hardware are thoroughly tested to maintain dataset continuity as the program & science evolves. Core…