CalCOFI Methods: Recent submissions

Now showing items 21-30 of 30

    • Hytech Salinometer. 

      CalCOFI (California Cooperative Oceanic Fisheries Investigation, La Jolla, CA, 2019)
      Prior to CalCOFI's use of Guildline's Autosal and Portasal, different instrumentation or techniques were used to measure seawater sample salinities. When I first participated in cruises in the mid-1980's, salinities were ...

    • Distance From Shore. 

      CalCOFI (California Cooperative Oceanic Fisheries Investigation, La Jolla, CA, 2013)
      Distance = Distance from shore in nautical miles. The CalCOFI database includes a calculated distance-from-shore value used primarily for vertical section plots published in the hydrographic data reports. CalCOFI line ...

    • Dissolved oxygen. 

      CalCOFI (California Cooperative Oceanic Fisheries Investigation, La Jolla, CA, 2014)
      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 of the original method devised by Winkler ...

    • CTD Setup & Diagnostics: Seabird CTD-Carousel Setup & Deck Unit Diagnostics. 

      CalCOFI (California Cooperative Oceanic Fisheries Investigation, La Jolla, CA, 2017)
      SIO-CalCOFI’s method of terminating the sea cable uses a custom 4-pin pigtail to terminate a multi-strand conductive wire that allows each individual conductor to be used in any combination. Terminating the sea cable using ...

    • CTD General Practices: System Description, Deployment, Data Aquisition, & Maintenance. 

      CalCOFI (California Cooperative Oceanic Fisheries Investigation, La Jolla, CA, 2017)
      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 ...

    • Chlorophyll methods. 

      CalCOFI (California Cooperative Oceanic Fisheries Investigation, La Jolla, CA, 2015)
      Chlorophyll a is extracted in an acetone solution. Chlorophyll and phaeopigments are then measured fluorometrically using an acidification technique.

    • Bottle sampling depths. 

      CalCOFI (California Cooperative Oceanic Fisheries Investigation, La Jolla, CA, 2017)
      The CalCOFI CTD-rosette is equipped with a Sea-Bird Electronic carousel water sampler (SBE 32), a computer-driven, electro-magnetically-released latch system. The 24 ten-liter plastic (PVC) bottles, equipped with epoxy-coated ...

    • CalCOFI bottle sampling. 

      CalCOFI (California Cooperative Oceanic Fisheries Investigation, La Jolla, CA, 2018)
      The CalCOFI CTD-rosette is equipped with a Sea-Bird Electronic carousel water sampler (SBE 32), a computer-driven, electro-magnetically-released latch system. The 24 ten-liter plastic (PVC) bottles, equipped with epoxy-coated ...

    • Nutrient methods. 

      CalCOFI (California Cooperative Oceanic Fisheries Investigation, La Jolla, CA, 2015)
      The phytoplankton macro nutrients nitrate, nitrite, silicate, and phosphate in seawater are analyzed using colorimetric assays. Ammonium concentrations are determined using a fluorometric assay.

    • Bottom Depth Echo-Sounding Correction. 

      CalCOFI (California Cooperative Oceanic Fisheries Investigation, La Jolla, CA, 2018)
      CalCOFI has always corrected bottom depths reported using Carter Tables 50 & 51 for the CalCOFI operations area, California's west coast.