Bottle sampling depths.
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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 springs & Viton (non-toxic) O-rings, connect to 24 individual triggers by lanyards which keep the bottle ends open. During the downcast, profiles of different sensor measurements vs depth are displayed real-time on a computer screen. Based on the chlorophyll maximum & mixed layer depths, bottles are closed at specific depths to isolate the seawater. The 10 meter bottle spacing shifts up or down (see table below) to resolve steep gradient features such as chlorophyll, oxygen, nitrite maxima and shallow salinity minimum. Salinity, oxygen and nutrients samples are analyzed at-sea for all depths sampled. Chlorophyll-a and phaeopigments samples from the top 200 meters, bottom depth permitting, are also extracted for 24hrs and analyzed at-sea. Most CTD-rosette casts sam.....
PublisherCalifornia Cooperative Oceanic Fisheries Investigation
La Jolla, CA
Sustainable Development Goals (SDG)14.a
Essential Ocean Variables (EOV)N/A
Spatial CoverageCalifornia waters
Northeast Pacific Ocean
CitationCalCOFI (2017) Bottle sampling depths. La Jolla, CA, California Cooperative Oceanic Fisheries Investigation, 2pp. DOI: http://dx.doi.org/10.25607/OBP-1586
- CalCOFI Methods 
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